Best Manufacturing Tips on Carbide Tools, Cutting Tools, Threading Tools & Boring Tools

1] External Threading Tools:

These tools are used to cut screw threads on the outside diameter of components/parts such as bolts, shafts, pipes, castings and forgings made from ferrous and non ferrous materials.

These tools can be used to cut screw threads in Metric, British, Acme and other standards.

2] Internal Threading Tools:

These tools are used to cut screw threads on the internal diameters of components/parts such as nuts, pipes, collars, castings and forgings made from ferrous and non ferrous materials.

These tools can cut screw threads in Metric, British, Acme and other standards.

The major diameter of the thread has to be machined prior to external threading and the root diameter of the thread has to be machined prior to internal threading.

It is very important to provide an undercut on the outside or inside diameters  before carrying out thread cutting as this allows the threading tool to pass into the undercut just after carrying out threading to the required length and before it returns to the starting point.

While cutting threads it is essential to use a cooling medium such as straight oils or oil in an emulsion with water.

Thread cutting is always done in multiple passes of depths of about 0.1 mm or 0.004 inch to reduce load on the lathe as both cutting edges are working together, maximise tool life and achieve proper thread form to meet gauging requirements.

Overhang of the threading tools is a major factor that contributes to vibration, poor cutting conditions and poor thread form.

As the pitch of threads vary from 0.5 mm to 5.0 mm the rotational speed on conventional lathes are kept low. However, higher speeds can be used in CNC Lathes as the tool return is preset on the machine and controlled.

Care should be taken while setting up for threading so that over run of the threading tool is avoided as it may cause major accidents and damage to the tools and the machine.

There are multiple reasons Machine Shops Fail in this terrible economy, the main reasons include:

1. The Quality and price of Raw Materials
2. The Operational Cost of your machine shop
3. The quantity produced per item/ order
4. The marketing strategies involved in getting new clients
5. Always give out few samples for clients to test and evaluate

To survive and thrive in this economy, your machine shop must focus on 5 main important things,

1. The Quality and price of Raw Materials

Procure raw materials from approved sources only along with material test certificates. The price you pay for your raw material is one of the main drivers for your profit.

2. The Operational Cost of your machine shop

To thrive in this economy, every machine shop needs to keep its operating costs as low as possible. Do not try to rent or invest in new machinery to carry out large orders, rather get the work done from reliable sources at affordable rates.

3. The quantity produced per items
Focus on large orders to save set up times on machines which will lead to improved productivity

4. The marketing strategies involved in getting new clients

The most important thing for a machine shop is on new ways of business development. Focus on the internet to get new clients all over the world. Inbound marketing strategies are successful ways to gain new clients.
Maintain your web site regularly and ensure fresh content is added frequently to improve your google ranking.

5. Always give out few samples for clients to test and evaluate

Once you have a lead, always try and provide free samples to the lead for them to get a clear understanding of the quality of products they would get once an order is placed. This will definitely speed up the process for the client to place orders and will help in increased top and bottom lines.

Procurement of Raw materials:
1] Procure steel rods from approved sources only along with material test certificates.
2] Procure carbide tips from the approved source in Europe or from Kennametal in India. Tectools is a manufacturer cutting tools and threading tools sources their carbide from India and Europe

Inspection of Raw materials:
1] Carry out chemical analysis of the steel rods and check against specifications
2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.
3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.
1] Set and cut steel rods to lengths of 4.6 inches and check.

2] Set and mill the left side approach angle of the tools at 40 deg x 8 deg for a width of 0.4 inch and check.

3] Set and mill the right side approach angle of 40 deg x 8 deg and maintain overall length of 4.50 inches and check

4] Set and mill a top rake angle of 0 deg perpendicular to the axis of the tool shank for a width of 7/8 inch and maintain height over the front edge at 11/16 inch and check.

5] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face to ensure that the carbide tip protrudes outside the steel shank by at least 1/32 inch, maintain height over carbide tip at ¾ inch plus or minus 1/64 inch and check.

6] De burr the turning tool shanks and stamp the designation as D-12 C5 and check.

7] Carryout inspection of all operations done so far.

8] Grind the E 10 C5 carbide tips to remove the sintered surfaces on the brazing area.

9] Degrease the shanks of the turning tools and the carbide tips and ensure that the brazing area is free of rust.

10] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

11] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

12] Set the Induction brazing machine with a suitable induction coil and power tapping points.

13] Insert the under cutting tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the under cutting tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

14] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

15] Set and grind the top rake angle, front clearance angle, side clearance angle and corner radius of 0.8 mm on the carbide tips as per drawing and check.

16] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

17] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.

18] Paint the tools and apply colour code at the back end to identify the grade.
Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

19] Pack the turning tools in a suitable corrugated box and ship out

Procurement of Raw materials:
1] Procure steel rods from approved sources only along with material test certificates.
2] Procure carbide tips from the approved source in Europe or from Kennametal in India.

Inspection of Raw materials:
1] Carry out chemical analysis of the steel rods and check against specifications
2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.
3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.
1] Set and cut steel rods to lengths of 4.6 inches and check.
2] Set and mill the left side approach angle of the threading tools at 30 deg x 8 deg for a width of 0.4 inch and check.
3] Set and mill the right side approach angle of 30 deg x 8 deg and maintain overall length of 4.50 inches and check
4] Set and mill a top rake angle of 0 deg perpendicular to the axis of the tool shank for a width of 7/8 inch and maintain height over the front edge at 11/16 inch and check.
5] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face to ensure that the carbide tip protrudes outside the steel shank by at least 1/32 inch, maintain height over carbide tip at ¾ inch plus or minus 1/64 inch and check.
6] De burr the threading tool shanks and stamp the designation as E-12 C5 and check.

7] Carryout inspection of all operations done so far.

8] Grind the ASA 6340 C5 carbide tips to remove the sintered surfaces on the brazing area.
9] Degrease the shanks of the threading tools and the carbide tips and ensure that the brazing area is free of rust.
10] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India
11] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.
12] Set the Induction brazing machine with a suitable induction coil and power tapping points.
13] Insert the threading tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the threading tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

14] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

15] Set and grind the top rake angle, front clearance angle and side clearance angles on the carbide tips as per drawing and check.

16] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

17] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.
18] Paint the tools and apply colour code at the back end to identify the grade.
Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

19] Pack the notching tools in a suitable corrugated box and ship out

1] Bright drawn steel rods of 3/4x3/4 inch to AISI 1018 specification.

2] Carbide tips as per ISO C 20 of C 5 grade.

Procurement of Raw materials:

1] Procure steel rods from approved sources only along with material test certificates.

2] Procure carbide tips from the approved source in Europe or from Kennametal in India.

Inspection of Raw materials:

1] Carry out chemical analysis of the steel rods and check against specifications

2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.

3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.

1] Set and cut steel rods to lengths of 4.6 inches and check.

2] Set and mill the front clearance angle of the tools at 0 deg x 10 deg and maintain overall length of 4.5 inches and check.

3] Set and mill a positive top rake angle of 0 deg parallel to the front clearance angle  for a width of 5/8 inch and maintain height over the front edge at 0.65 inch and check.

4] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face and front clearance angle to ensure that the carbide tip protrudes outside the steel shank by at least 1/32 inch, maintain height over carbide tip at ¾ inch plus or minus 1/64 inch and check.

5] De burr the forming tool shanks and stamp the designation as C 12 C5 and check.

6] Carryout inspection of all operations done so far.

7] Grind the C 20 C5 grade carbide tips to remove the sintered surfaces on the brazing area.

8] Degrease the shanks of the grooving tools and the carbide tips and ensure that the brazing area is free of rust.

9] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

10] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

11] Set the Induction brazing machine with a suitable induction coil and power tapping points.

12] Insert the cutting tools to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the cutting tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

13] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

14] Set and grind the top rake angle, front clearance angle, side clearance angle and corner radius of 1/32 inch on the carbide tip as per drawing and check.  

15] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

16] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.

17] Paint the tool bits and apply colour code at the back end to identify the grade.

Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

18] Pack the chamfering tools in a suitable corrugated box and ship out     

 Raw materials Used:

1] Bright drawn steel rods of 20x20 mm to AISI 1018 specification.

2] Carbide tips as per ISO A 12 of P30 grade.

Procurement of Raw materials:

1] Procure steel rods from approved sources only along with material test certificates.

2] Procure carbide tips from the approved source in Europe or from Kennametal in India.

Inspection of Raw materials:

1] Carry out chemical analysis of the steel rods and check against specifications

2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.

3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.

1] Set and cut steel rods to lengths of 255 + 3 mm and check.

2] Turn the front portion of the cutting tool shank to 19.5+ 0.2 mm for a length of 105 mm   

3] Bend the front end of the round portion to an angle of 15 deg for a length of 31 mm.

4] Set and mill the front clearance angle of the boring tools at 0 deg x 8 deg at the front end of the shank and maintain overall length at 250 + 3 and check.

5] Set and mill a positive top rake angle of 9 deg x 45 deg with a special cutter perpendicular to the shank for a width of 14 mm and maintain height over the front edge at 13.5 mm and check.

6] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face and front clearance angle to ensure that the carbide tip protrudes outside the steel shank by at least 0.8 mm, maintain height over carbide tips between 14.3 and 14.7 mm and C dimension at 6.8 to 7.2 and check.

7] De burr the boring tool shanks and stamp the designation as ISO 9 R 2020 P 30 or as DIN 4974 R 20x20 P30 and check.

8] Carryout inspection of all operations done so far.

9] Grind the A 12 P30 carbide tips to remove the sintered surfaces on the brazing area.

10] Degrease the shanks of the boring tools and the carbide tips and ensure that the brazing area is free of rust.

11] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

12] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

13] Set the Induction brazing machine with a suitable induction coil and power tapping points.

14] Insert the boring tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the boring tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

15] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

16] Set and grind the top rake angle, front clearance angle, side clearance angle and corner radius of 0.4 mm on the carbide tips as per drawing and check.  

17] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

18] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.

19] Paint the tools and apply colour code at the back end to identify the grade.

Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

20] Pack the boring tools in a suitable corrugated box and ship out     

Raw materials Used:

1] Bright drawn steel rods of 20x20 mm to AISI 1018 specification.

2] Carbide tips as per ISO A 12 of P30 grade.

Procurement of Raw materials:

1] Procure steel rods from approved sources only along with material test certificates.

2] Procure carbide tips from the approved source in Europe or from Kennametal in India.

Inspection of Raw materials:

1] Carry out chemical analysis of the steel rods and check against specifications

2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.

3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.

1] Set and cut steel rods to lengths of 255 + 3 mm and check.

2] Turn the front portion of the cutting tool shank to 19.5+ 0.2 mm for a length of 105 mm   

3] Bend the front end of the round portion to an angle of 15 deg for a length of 27 mm.

4] Set and mill the front clearance angle of the boring tools at 15 deg x 8 deg for a width of 10 mm at the front end of the shank and check.

5] Set and mill the front clearance angle of 0 deg x 0 deg to maintain front width at 8mm and overall length of 250 + 7 mm and check  

6] Set and mill a positive top rake angle of 9 deg x 45 deg with a special cutter parallel to the front clearance angle of 15 deg to a width of 14 mm and maintain height over the front edge at 13.5 mm and check.

7] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face and front approach angle to ensure that the carbide tip protrudes outside the steel shank by at least 0.8 mm, maintain height over carbide tips between 14.3 and 14.7 mm and C dimension at 6.8 to 7.2 and check.

8] De burr the boring tool shanks and stamp the designation as ISO 8 R 2020 P 30 or as DIN 4973 R 20x20 P30 and check.

9] Carryout inspection of all operations done so far.

10] Grind the A 12 P30 carbide tips to remove the sintered surfaces on the brazing area.

11] Degrease the shanks of the boring tools and the carbide tips and ensure that the brazing area is free of rust.

12] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

13] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

14] Set the Induction brazing machine with a suitable induction coil and power tapping points.

15] Insert the boring tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the boring tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

16] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

17] Set and grind the top rake angle, front clearance angle, side clearance angle and corner radius of 0.4 mm on the carbide tips as per drawing and check.  

18] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

19] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.

20] Paint the tools and apply colour code at the back end to identify the grade. Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

18] Pack the boring tools in a suitable corrugated box and ship out     

Raw materials Used:

1] Bright drawn steel rods of 20x12 mm to AISI 1018 specification.

2] Carbide tips as per ISO D 4 of P30 grade.

Procurement of Raw materials:

1] Procure steel rods from approved sources only along with material test certificates.

2] Procure carbide tips from the approved source in Europe or from Kennametal in India. TecTools Engineering a manufacturer of cutting tools & threading tools sources its carbide from Europe.

Inspection of Raw materials:

1] Carry out chemical analysis of the steel rods and check against specifications

2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.

3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.

1] Set and cut steel rods to lengths of 127+ 3 mm and check.      

2] Set and mill the front clearance to 0 deg x 8 deg and maintain overall length of 125+6mm and check.

3] Set and Mill the tip seating area at a positive rake angle of 0 deg x8 deg parallel to the front edge and maintain height over tip between 19.8 and 20 mm and check.

4] Set and mill the left side clearance angle of the grooving & recessing tools at 1 deg x 2 deg to maintain width of 11.8 mm at the front end of the shank and check.

5] Set and mill the right side clearance angle of 1 deg x 2 deg x 45 deg with a form cutter to maintain front width at 3.6 mm.

6] Mill a positive top rake angle of the cutting tools at 8 deg x 30 deg parallel to the tip seat to a width of 15 mm from the front end and check.

7] De burr the cutting tool shanks and stamp the designation as ISO 7 R 2012 P 30 or as DIN 4981 R 2012 P30 and check.

8] Carryout inspection of all operations done so far.

9] Grind the D 4 P30 carbide tips to remove the sintered surfaces on the brazing area.

10] Degrease the shanks of the recessing tools and the carbide tips and ensure that the brazing area is free of rust.

11] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

12] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

13] Set the Induction brazing machine with a suitable induction coil and power tapping points.

14] Insert the cutting tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the cutting tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

15] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

14] Set and grind the top rake angle, front clearance angle and side clearance angles  as per drawing and check.  

15] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

16] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting

17] Paint the tools and apply colour code at the back end to identify the grade.

Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

18] Pack the recessing tools in a suitable corrugated box and ship out.     

1] Bright drawn steel rods of 30x20 mm to AISI 1018 specification.

2] Carbide tips as per ISO B 16 of P30 grade.

Procurement of Raw materials:

1] Procure steel rods from approved sources only along with material test certificates.

2] Procure carbide tips from the approved source in Europe or from Kennametal in India. Tectools a manufacture of Carbide tools & Lathe Tools sources its carbide from Europe.

Inspection of Raw materials:

1] Carry out chemical analysis of the steel rods and check against specifications

2] Visually inspect the steel rods for defects such as cracks, deep dents and heavy scoring marks and clear materials if ok for all the above checks for manufacture.

3] Check the grade of the carbide tip to ascertain that the right grade is being used for manufacture of the tools.

Manufacturing Procedure.

1] Set and cut steel rods to lengths of 127+ 3 mm and check.

2] Set and mill the shank portion from 30 mm to 20 mm and create a head of 22 mm length and check.

3] Set and Mill the inside approach and clearance angle of the turning tools at 35 deg x0 deg and check.

4] Set and mill the outside approach and clearance angle of the turning tools at 35 deg x0 deg to maintain width of 18 mm at the front end of the shank and check.

5] Set and mill the front clearance angle of 5 deg x 8 deg to maintain front width at  19 mm.

6] Mill a positive top rake angle of 12 deg parallel to the front clearance angle to a width of 13 mm and maintain height over the front edge at 19 mm and check.

5] Set and mill the tip pocket of the cutting tool shank parallel to the top rake face and front approach angle to ensure that the carbide tip protrudes outside the steel shank by at least 0.8 mm, maintain height over carbide tips between 19.8 and 20.2 mm and C dimension at 9.8 to 10.2 and check.

6] De burr the cutting tool shanks and stamp the designation as ISO 5 R 2020 P 30 or as DIN 4977 R 20x20 P30 and check.

7] Carryout inspection of all operations done so far.

8] Grind the B 16 P30 carbide tips to remove the sintered surfaces on the brazing area.

9] Degrease the shanks of the turning tools and the carbide tips and ensure that the brazing area is free of rust.

10] Procure Silver foil of 0.1 mm thickness having min of 49% silver content and devoid of any Tin or Lead from Degussa in Germany or from an approved source in India

11] Apply suitable brazing flux on the tip seat area, build up a sandwich of 2 silver foils and a copper foil in between with brazing flux in between them and place them on the tip seat area, apply brazing flux to the area of the tip that gets brazed, place the tip to be brazed on top of the sandwich of foils. Allow to dry.

11] Set the Induction brazing machine with a suitable induction coil and power tapping points.

12] Insert the turning tool to be brazed with the carbide tip into the induction coil and start heating. Stabilise heating when the steel shank turns from blue to mild red in colour. Start heating again to take the carbide tip and the steel area surrounding it to the melting point of silver. Press the tip into position with a pointer rod and allow the turning tool to cool to about 200 deg C. Remove the tool from inside the induction coil and place it in pre heated sand and allow it to cool to the room temperature.

13] Inspect the joint to ensure that the carbide tip is brazed properly onto the shank and that the silver has flown properly and that there are no gaps in the joint.

14] Set and grind the top rake angle, front clearance angle, side clearance angle and corner radius of 0.4mm on the carbide tips as per drawing and check.  

15] Carry out final inspection of the tools for dimensions and defects on carbide tips prior to painting.

16] Apply a cloth tape on the tips or hot dip the carbide tips in a plastic medium and wash the tools in a chemical that cleans, degreases and phosphates the shank prior to painting.

17] Paint the tools and apply colour code at the back end to identify the grade.

Dark Blue for P20, light blue for P30, Red for K20 and Yellow for M20.

18] Pack the turning tools in a suitable corrugated box and ship out