How does a mini drill flexible shank work?

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Discussion Overview

The discussion centers on the working mechanism of a mini drill flexible shank, specifically how it transmits torque and energy while maintaining flexibility. The scope includes technical explanations and references to patents related to flexible shafts.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the mechanism that allows a mini drill flexible shank to deliver torque and energy flexibly.
  • Another participant describes the construction of the flexible shank, noting an inner core made of flexible multi-strand wire cable, surrounded by helical layers of steel wire that transmit torque depending on the direction of rotation.
  • Several participants share links to patents related to flexible shafts, questioning their applicability to drill extenders, with some noting that many patents seem to pertain to surgical instruments.
  • A participant expresses difficulty in locating a specific link for a moto-tool flexible shaft, indicating a potential mix-up in shared resources.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the applicability of the patents shared, as there are competing views regarding their relevance to drill extenders versus surgical instruments.

Contextual Notes

Some assumptions about the materials and construction of flexible shanks may be implicit, and the discussion does not resolve which patents are most relevant to the topic at hand.

abdulbadii
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TL;DR
Help solve confusion on how the real mini drill flexible shank working mechanism
How is actually is a mini drill flexible shank working mechanism being able to deliver torque/energy/force so pliable ?
 
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There is an inner core made from flexible multi-strand wire cable.
Outside that is wound a helix of steel wire, and then a counter-wound helix of steel wire.
Depending on the direction of rotation, the torque is transmitted by tension in one of the helical layers.
 
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berkeman said:
Which one of those patents apply to a drill extender? Most seem to be for surgical instruments...
I believed I had posted a link for a moto-tool flexible shaft instead.
Sorry, I can't find it again.
 

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