Four-Jaw Chucks: Difference between revisions

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===Four-Jaw-Chucks===
===Four-Jaw-Chucks===



Revision as of 21:13, 16 October 2022

Four-Jaw-Chucks

AccessoryInfoBox

Four-Jaw Chucks

Four-Jaw Chuck.jpg
Synonyms: four-jaw scroll chucks; DE: Vierbackenfutter
Type: workholding (woodturning)
Material: wood
Used with: Tyme Avon wood lathe,
(optional) dovetail scraper
Access Requirements: read this page
Tutors: Lukas

Four-jaw chucks are a very nice workholding option for woodturning projects that can't be held between centers (e.g. bowls).

They do not automatically center a workpiece like three-jaw chucks you may know from metal turning, but have other advantages to work especially well with wood.

The chucks come with different jaw sets (Spannbacken) for different diameters. You don't use the "pointy" base jaws directly because they dent the wood! Instead, in the first step a recess or tenon (Zapfen) with the exact jaw diameter (and often a dovetail profile) is turned with other workholding options and the workpiece is then flipped around to be held by the chuck.

Precision

The holding force is best when the jaw diameter (and shape) matches the workpiece precisely. Reportedly, it can be improved further by tightening both chuck screws, not just one. HolzWerken 99

We could make laser cut templates for the various jaw sets!

Turning green wood can be an exception to this rule: keeping in mind shrinkage, you may want to oversize your tenon during the first round of rough turning so you can cut it to the proper size when you finish the piece. [1]

Available Chucks

The chucks are screwed onto a wood lathe's spindle screw, so they are somewhat machine specific based on the thread.

Chuck Name Thread Lathes Jaw Sets
For Jaw Chuck SuperNove² Woodturning Chuck

(Manufacturer Site)

Tyme Avon Small and large one

Helpful Videos