Four-Jaw Chucks: Difference between revisions

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|material=[[wood]]
|material=[[wood]]
|used with=[[Used With::Tyme Avon|Tyme Avon wood lathe]],<br>(optional) [[Dovetail Scraper|dovetail scraper]]
|used with=[[Used With::Tyme Avon|Tyme Avon wood lathe]],<br>(optional) [[Dovetail Scraper|dovetail scraper]]
|location=
|location=[[Location::Woodturning Area|woodturning area]]
|access=read this page
|access=read this page & manuals where available
|tutors={{£}}
|tutors={{£}}
|manual=
|manual=see [[#Available Chucks|list]]
|donation=
|donation=
|similar=
|similar=[[Three-Jaw Chucks|three-jaw chucks]]
}}
}}
Four-jaw chucks are a very nice workholding option for [[woodturning]] projects that can't be held between centers (e.g. bowls).


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|three-jaw chucks]] you may know from metal [[turning]], but have other advantages to work especially well with wood.


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. Take care to put them in the '''correct order''' - most jaws will be numbered and only close in a neat point or square if you match them with the proper spot on the chuck.


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.<gallery>
You usually don't use the "pointy" base jaws to directly hold a [[Woodturning Blank|woodturning blank]] 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.
File:Four-Jaw Chuck.jpg|For Jaw Chuck with both chuck sets
<gallery>
File:Four-Jaw Chuck No Chucks.jpg|Four-Jaw Chuck without any chucks (do not use it like this)
File:Four-Jaw Chuck.jpg|four-jaw chuck (SuperNova²) with two very different jaw sets
File:For-Jaw Chuck Holding Workpiece.jpg|Four-Jaw Chuck holding a workpiece
File:Four-Jaw Chuck No Chucks.jpg|four-jaw chuck without any chucks (do '''not''' use it like this)
File:For-Jaw Chuck Holding Workpiece.jpg|four-jaw chuck holding a workpiece
</gallery>
</gallery>


====Precision====
====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.<sup> HolzWerken 99</sup>
The holding force is best when the jaw diameter (and shape) matches the workpiece '''precisely''' as specified in the manual (e.g. SuperNova²: 6 mm larger/smaller than the jaw diameter when fully closed/opened). Reportedly, it can be improved further by tightening both chuck screws, not just one.<sup> HolzWerken 99</sup>


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


Turning [[Green Wood|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.<sup> [https://m.youtube.com/watch?v=qO9xi5xd5NE&t=14m21s]</sup>
Turning [[Green Wood|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.<sup> [https://m.youtube.com/watch?v=qO9xi5xd5NE&t=14m21s]</sup>


====Available Chucks====
====Available Chuck/Jaw Combinations====
The chucks are screwed onto a [[Wood Lathes|wood lathe]]'s spindle screw, so they are somewhat machine specific based on the thread.
The chucks are screwed onto a [[Wood Lathes|wood lathe]]'s spindle screw, so they are somewhat machine specific based on the thread.
{| class="wikitable"
{| class="wikitable sortable"
|+
|+
!Photo
!Chuck
!Chuck
!Name
!Jaw Set
!Manual
!Workpiece (OD)
!Workpiece (ID)
!Thread
!Thread
!Lathes
!Lathe(s)
!Jaw Sets
!Adjustment Tools
!Further Parts
|-
|
|SuperNova²
|50 mm dovetail (standard)
|[https://www.teknatool.com/wp-content/uploads/2020/11/PRO-TEK-SUPERNOVA2-Full-Manual-FINAL-1.pdf teknatool.com]
|45-65 mm (ideal: 50 mm)
|50-75 mm (ideal: 67 mm)
|M25{{x}}2 mm with adapter (native: M33{{x}}3.5 mm)
|[[Tyme Avon]]
|4 & 8 mm [[Hex Keys|hex keys]]
|"Woodworm" screw for fast mounting of rough material
|-
|-
|For Jaw Chuck
|SuperNove² Woodturning Chuck
([https://www.teknatool.com/ Manufacturer Site])
|
|
|SuperNova²
|Cole jaws
|[https://www.teknatool.com/wp-content/uploads/2018/04/Accessory-Jaw-Manual_June08.pdf teknatool.com] - page 40
|56-236 mm
|'''nope'''
|M25{{x}}2 mm with adapter (native: M33{{x}}3.5 mm)
|[[Tyme Avon]]
|[[Tyme Avon]]
|Small and large one
|9 mm slot [[screwdriver]]
|8 rubber buffers - '''required!'''
|-
|
|''noName (CoMS 051)''
|''80(?) mm dovetail''
|
|47-77 mm (?)
|63-95 mm (?)
|M33{{x}}3.5 mm
|[[Holzmann D 460F]]
|4 & 10 mm [[Hex Keys|hex keys]]
|24 step indexing plate (attached)
|-
|
|''noName''
|''80(?) mm stepped/"pointy"''
|
|5-53 mm (?)
|63-95 mm (?)
|M33{{x}}3.5 mm
|[[Holzmann D 460F]]
|8 mm round steel handles
|
|}  
|}  


Revision as of 02:36, 14 September 2023

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
Location: woodturning area
Access Requirements: read this page & manuals where available
Tutors: Lukas
Manual: see list
Similar (More or Less): three-jaw chucks

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. Take care to put them in the correct order - most jaws will be numbered and only close in a neat point or square if you match them with the proper spot on the chuck.

You usually don't use the "pointy" base jaws to directly hold a woodturning blank 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.

  • four-jaw chuck (SuperNova²) with two very different jaw sets

    four-jaw chuck (SuperNova²) with two very different jaw sets

  • four-jaw chuck without any chucks (do not use it like this)

    four-jaw chuck without any chucks (do not use it like this)

  • four-jaw chuck holding a workpiece

    four-jaw chuck holding a workpiece

Precision

The holding force is best when the jaw diameter (and shape) matches the workpiece precisely as specified in the manual (e.g. SuperNova²: 6 mm larger/smaller than the jaw diameter when fully closed/opened). 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' ideal diameters!

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 Chuck/Jaw Combinations

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

Photo Chuck Jaw Set Manual Workpiece (OD) Workpiece (ID) Thread Lathe(s) Adjustment Tools Further Parts
SuperNova² 50 mm dovetail (standard) teknatool.com 45-65 mm (ideal: 50 mm) 50-75 mm (ideal: 67 mm) M25 × 2 mm with adapter (native: M33 × 3.5 mm) Tyme Avon 4 & 8 mm hex keys "Woodworm" screw for fast mounting of rough material
SuperNova² Cole jaws teknatool.com - page 40 56-236 mm nope M25 × 2 mm with adapter (native: M33 × 3.5 mm) Tyme Avon 9 mm slot screwdriver 8 rubber buffers - required!
noName (CoMS 051) 80(?) mm dovetail 47-77 mm (?) 63-95 mm (?) M33 × 3.5 mm Holzmann D 460F 4 & 10 mm hex keys 24 step indexing plate (attached)
noName 80(?) mm stepped/"pointy" 5-53 mm (?) 63-95 mm (?) M33 × 3.5 mm Holzmann D 460F 8 mm round steel handles

Helpful Videos


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