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How to make chuck soft claw

The soft claw can ensure the repeated positioning accuracy of the workpiece to the greatest extent, so that the center line of the machined workpiece can completely coincide with the center line of the spindle, and the flat surface on the soft claw can also ensure the length of the workpiece.
Most importantly, the soft claw can fit the surface of the workpiece to the greatest extent, which can not only ensure the transmission of greater torque, but also avoid the clamping injury of the workpiece. These advantages are unmatched by the hard claw.
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The following problems should be paid attention to when making soft claws:
1. Selection of soft claw material
“Soft” here means: good processing performance does not mean that it must be lower than the hardness of the workpiece (for mass production, the hardness of the soft claw will have a great impact on the processing stability. Choosing a soft claw material with higher hardness than the workpiece will not only improve the service life of the soft claw, but also have a positive impact on the processing stability).
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2. Selection of soft claw size
The soft claw shall hold at least 1/3 of the length of the workpiece.
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3. Installation position of soft claw on chuck
Any T-shaped block exceeding the maximum diameter of the chuck is not allowed, which will have a great safety risk.
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4. Pressure and position when using the claw dresser
It is recommended that the pressure during use is close to that during workpiece processing, the chuck is in the middle of the activity range during machining, and the direction of clamping force during claw repair is consistent with that of workpiece clamping force.
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5. Influence of chuck diameter and rotating speed on clamping force
Due to the centrifugal force, the clamping force will be greatly reduced when the chuck operates at high speed. Please refer to the instructions on the chuck for details.
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6. Make an inner hole with the same diameter as the workpiece
Reduce the possibility of clamping the workpiece.
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7. Add undercut
To ensure the repeated positioning of the workpiece.
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8. Remove burrs and sharp corners on the soft claw
Be careful not to scratch your hand.
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In the following video, the effect of rotating speed on clamping force will be explained through actual test.


When machining thin-walled or annular workpieces, overcoming the deformation of workpieces is the first problem to face. The key is to select the right type of soft claw and appropriate chuck pressure.
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Under the same chuck pressure, the fan-shaped soft claw has a larger contact area than the standard soft claw, which means that the pressure on the workpiece is more uniform, while the standard soft claw will have the following conditions:
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The actual situation may not be as obvious as in the figure, but in the video at the bottom, you can clearly see that under the same conditions except for different types of soft claws, the deformation degree of the workpiece is even dozens of times different. Whether it is fan-shaped soft claw or standard soft claw, it will need to be repaired due to excessive wear of soft claws or replacement of machined parts.
In the process of repair, first of all, mark and number the soft claw to be removed. This is to increase the use times of the soft claw, and more detailed marking will also reduce the possibility of misuse.
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Next is the selection of claw dresser:
Usually, the left claw trimmer trims the inner claw and the right trims the outer claw.
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The following problems should be paid attention to when making or repairing the soft claw:
The T-shaped block shall not exceed the maximum diameter of the chuck. The chuck pressure during claw repair is close to the pressure during workpiece processing. The chuck is in the middle of the moving range. The direction of clamping force during claw repair is consistent with that of workpiece clamping force. Pay attention to the rotating speed during claw repair, add tool return groove, and remove burrs and sharp corners.
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When both types of claw trimmers cannot meet the conditions, we need to make a special claw trimmer, such as machining the lower ring to repair the outer claw.
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When the part to be clamped is relatively long, the workpiece and soft claw can not fully fit, commonly known as “bell mouth”, specifically, there is a gap between the top of the soft claw and the workpiece.
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The most effective solution is to process the taper on the soft claw, measure the size of the gap through the feeler gauge, measure the clamping length, and then calculate the taper.
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How to write the program of adding taper on the lathe? The following video teaches you how to drive safely.


Source: Network Arrangement – China Pipe Sleeves Manufacturer – Yaang Pipe Industry (www.epowermetals.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@epowermetals.com

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