What is the principle of the keyless drill chuck?

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Discussion Overview

The discussion revolves around the working principle of keyless drill chucks, specifically focusing on how they achieve locking torque comparable to keyed chucks. Participants explore the mechanics and design differences between these two types of chucks, including the implications of thread design and torque application.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question how the locking torque of keyless chucks can be estimated to be equivalent to that of keyed chucks, particularly in relation to the inventor's claims.
  • One participant notes that the keyless chuck has a finer thread than a keyed chuck, which allows it to lock onto the drill shank with less torque but requires more turns.
  • Another participant suggests that the torque required to lock both types of chucks may be similar, depending on the radius of the keyless chuck compared to the keyed chuck.
  • A counterpoint is made that a larger outer diameter in keyless chucks reduces the grip needed to apply the same torque, and that the key provides a leverage advantage for keyed chucks, allowing them to be smaller.
  • Participants discuss the mechanics of the three tapered jaws in the chuck, which are advanced by a screw thread along a cone, noting that a gentler cone would necessitate a longer chuck.

Areas of Agreement / Disagreement

Participants express differing views on the torque requirements and mechanical advantages of keyless versus keyed chucks, indicating that the discussion remains unresolved with multiple competing perspectives.

Contextual Notes

The discussion includes assumptions about the design and mechanics of both types of chucks, as well as the implications of thread design on torque application, which may not be fully explored or agreed upon.

abdulbadii
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TL;DR
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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