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ER Collet chuck for Myford ML7R

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Mark B14/07/2020 23:06:19
47 forum posts
20 photos

A while back I purchased an ER25 collet chuck for my Myford - the single piece type which screws onto the headstock spindle. The runout was terrible at > 0.05mm so I returned it.

I have an MT2 / ER25 chuck but this has the disadvantage of not being able to hold long stock going through the headstock,

I used to own a Chinese Mini Lathe and that was fitted with an ER25 collet chuck and it was really accurate with <0.01mm runout.

I really want a good ER25 collet chuck which I can screw onto the headstock spindle and was wondering if this option from RDG would be a good option: Chuck link

If I machined the backplate carefully would I achieve a repeatable low runout, or are my expectations for this mounting too high?

Thanks

Sandgrounder15/07/2020 06:48:57
194 forum posts
6 photos

A few months ago I bought a 2 piece ER32 collet chuck assembly from Myford Ltd and it's excellent, strangely though I can't find it on the website now but they do have the same type in your required size.

'ER25 Collet nose adaptor assembly 20/294' , sorry about the link I don't know how to post short ones.

https://www.myford.co.uk/cgi-bin/sh000002.pl?WD=collet%20chuck%20er25&PN=ER25%2dCOLLET%2dNOSE%2dADAPTOR%2dASSEMBLY%2d%2dSMALL%2dBORE%2d%2d20%2d294%2d1433%2ehtml#SID=156

Myford and RDG are owned by the same company but have different suppliers.

John

Edited By Sandgrounder on 15/07/2020 06:52:58

Micky T15/07/2020 06:53:45
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59 forum posts
29 photos

Hi Mark I purchased an ER32 collet check from RDG for a Grayson Lathe which has an identical spindle nose to the Myford and that was very accurate. I have since machined a back plate for a Boxford which I have attached the ER32 Collet chuck to and that is also very accurate. So in answer to your question yes you can machine a new backplate.

MickyT

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