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Mounting a collet chuck.

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Andy Sproule24/09/2020 14:18:48
117 forum posts
32 photos

s-l1600.jpgwhatsapp image 2020-09-24 at 14.07.33.jpegHi,I have a spare D1-3 back plate which fits my boxford I want to mount an er32 collet chuck to it could anyone advise the best method.One of the pics is the er32 chuck which I've been looking at but haven't bought yet.whatsapp image 2020-09-24 at 14.07.18.jpeg

Nigel Bennett24/09/2020 14:49:42
362 forum posts
11 photos

Hello Andy

I hope the backplate is big enough to fit the chuck!

it's normal to turn the backplate register so that it fits the collet chuck very closely. What is most important is that the front face of the backplate, where the chuck fits, is skimmed absolutely flat to provide an accurate location to avoid wobble. Having achieved a good fit on diameter, you then need to drill and tap one or other of the items to hold them together; using the one to spot the holes in the other is the usual way. Fit the thing together and do the screws up. Job done. In theory...

If the PCD of the existing holes in backplate and chuck don't agree, then you'll have to choose a suitable orientation for them to get some metal in the appropriate positions.

However, it's very likely, looking at your backplate, that the turned register on your backplate could be smaller than the female recess in the chuck. (If it isn't, just turn it to a good fit as above.) It can still be used if it's too small.

Having got the bits together and done up the screws, clock the tapered bore of the chuck with a good clock gauge. Unless you're really lucky it will probably be a little bit out. It's a case then of dismantling, skimming off a small bit on the diameter of the backplate register and re-assembling with the screws gently nipped up. Clock up the bore again and use a soft hammer to bop the chuck true to the clock gauge. This may take some time (and bops) and may even involve skimming off a bit more of the register diameter, but persevere and you'll get there. Tighten up the screws a bit more and re-check with the clock gauge - it may need further bopping. You should be able to get it to virtually zero runout.

Then, before you do anything else, I would then drill two little dimples, one in the backplate adjacent to a Camlock pin, and another on the lathe spindle close by so that you can re-fit it in the same orientation. Fill both with red paint. (I've done that on my Boxford 280 and all my chucks are marked.)

Hope that helps!

Emgee24/09/2020 14:51:19
1724 forum posts
232 photos


You may be able to buy an ER chuck backplate with a recess the same diameter as the spigot on your D1-3 chuck backplate, if not you need to turn the spigot diameter to suit the ER backplate recess.
Std sizes are 55, 72 and 95mm diameter recesses but others may be available.


Edited By Emgee on 24/09/2020 14:54:02

John Haine24/09/2020 15:00:08
3343 forum posts
178 photos

Another approach is to shrink fit (or Loctite) a spigot into the hole in the backplate and turn your own chuck body. Collet nuts are easily available, including ball bearing. The threading and taper are fairly easy to get right.

old mart24/09/2020 21:06:26
1997 forum posts
151 photos

The backplate is drilled and tapped for three and four jaw chucks. If you would like to preserve the backplate just in case it is needed for a chuck in the future, then an adaptor plate for the collet holder could be made if it will not fit directly.

Andy Sproule25/09/2020 19:43:29
117 forum posts
32 photos

Thank you for all replies a great help.

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