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Chuck Jaws

Garno

Garno

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Joined
May 12, 2021
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1,372
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Dronfield
First Name
Gary
When a chuck is not tightened up or even on the lathe what level of movement is acceptable?
I have the allen keys tightened on the individual jaws and the chuck is open about 12mm (gap between top of jaws) and I have movement on each jaw of about 2mm towards the centre and outside of chuck is this an acceptable amount or does it not matter?
 
C

Curly

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Nov 3, 2019
Posts
441
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RM of Aberdeen, Saskatchewan, Canada
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Peter
Just looked at my Super Nova and it does the same to a lesser extent but it wasn't mounted on the spindle so I couldn't push/pull too hard. I think you are fine. It is the tolerance between the jaws and the scroll they engage.

Pete
 
21William

21William

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Jan 21, 2016
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1,629
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Dorset
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William
They seem to vary but my wood turning chucks don’t seem to be as good in this respect as my metal turning chucks.
 
H

howsitwork?

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Sep 18, 2019
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Location
north york (gods own county)
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Ian
Garbo

the chuck jaws will move slightly due to their fit in the scroll. ( unless it’s an independent jaw chuck) inside the chuck body .

To test concentricity grip a round piece of silver steel in the jaws and use a dti to measure 5h3 variation in rounds you spin it BY HAND NOT UNDER POWER !!!


To measure internal concentricity get a round bit of tube put it on the jaws and expand the jaws into it. Then measure the internal contact surface again using a dti fixed to an arm or magnetic base.
 
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