What is the principle of the keyless drill chuck?

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The discussion centers on the working principle of keyless drill chucks, noting that they can achieve locking torque comparable to keyed chucks through design differences. Keyless chucks utilize a finer thread that requires less torque but more turns to secure the drill shank. The three tapered jaws of the chuck are advanced by a screw thread along a cone, which affects the locking mechanism's efficiency. While some participants compare the torque requirements of both chuck types, it is clarified that the larger diameter of keyless chucks reduces the grip needed to apply the same torque. Overall, the design intricacies of keyless chucks enable effective locking without the need for a key.
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How is the keyless drill chuck can have locking torque great enough
How is the working principle of keyless drill chuck, the inventor confidently estimated that it'd have locking torque great enough as the same as to the keyed one just by turning around, fastening to motor spindle/connector?
 
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abdulbadii said:
TL;DR Summary: How is the keyless drill chuck can have locking torque great enough

How is the working principle of keyless drill chuck, the inventor confidently estimated that it'd have locking torque great enough as the same as to the keyed one just by turning around, fastening to motor spindle/connector?
Please, please always include links to what you want to discuss! Which keyless drill chuck? Like the one on my cordless drill? Or do you have some different one in mind? Which inventor?
 
The keyless chuck has a finer thread than a keyed chuck.
To lock onto the drill shank, the keyless chuck requires less torque, but more turns.
 
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Baluncore said:
The keyless chuck has a finer thread than a keyed chuck.
To lock onto the drill shank, the keyless chuck requires less torque, but more turns.

Well the OP is likely in a timezone where they are asleep right now, but it seems like the keyless chuck on my cordless drill has a radius comparable to the key on my regular drill press. So it takes about the same torque to lock each, no?
 
berkeman said:
So it takes about the same torque to lock each, no?
No. A bigger outer diameter will reduce the grip needed to apply the same torque. The key provides a leverage advantage that permits the keyed chuck to be smaller.
The three tapered jaws in the chuck are advanced by a screw thread, along a cone of the same angle as the jaws.
A more gentle cone would require a longer chuck.
The finer thread advances more slowly per turn, with less torque.
 
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