ER32 Chuck

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dazz
CNC Expert
CNC Expert
Posts: 237
Joined: Sat 19 Aug , 2006 11:31 am
Hardware/Software: Viceroy TDS 1/1GB lathe, Imperial, stripped down and rebuilt.
Viceroy Taper/Tracer attachment, Shop made cross slide tracer attachment, VSD.
Location: New Zealand

ER32 Chuck

Post by dazz » Mon 08 Nov , 2010 7:40 am

Hello

I purchased a ER32 chuck and collet set. The chuck holder is a standard 3MT version. Fine for my mill, but not so useful for the lathe. I made a chuck adapter.

The photos are not quite in the right order, but you should get the idea.

Regards

Dazz
Attachments
er32 Chuck.GIF
My design for an ER32 chuck.
er32 Chuck.GIF (20.6 KiB) Viewed 10804 times
IMG_1135.jpg
The collet nut end before threading.
IMG_1135.jpg (54.67 KiB) Viewed 10805 times
IMG_1123.jpg
This photo is out of order. It shows internal threading using a boring tool made for the job. Making tools to make more tools.
IMG_1123.jpg (55.8 KiB) Viewed 10805 times
IMG_1120.jpg
Lots of chips.
IMG_1120.jpg (133.49 KiB) Viewed 10805 times
IMG_1119.jpg
Drilling out the workpiece.
IMG_1119.jpg (88.12 KiB) Viewed 10805 times
IMG_1117.jpg
The adapter internal thread was tested with my very first project. The spindle to 3MT adapter has exactly the same thread as the lathe spindle. I was able to test the internal thread for fit without removing the work from the 4-jaw chuck. As a final check, I removed the 4-jaw chuck with the work held in it and screwed the new adapter onto the lathe spindle.
IMG_1117.jpg (68.21 KiB) Viewed 10805 times
IMG_1157.jpg
Machining the C-spanner slots. The workpiece was bolted to the angle. The workpiece sat on a piece of key steel. The vertical tube fixed the lateral position. This mean't I could rotate the workpiece and clamp into the right position for the next cut.
IMG_1157.jpg (69.08 KiB) Viewed 10805 times
IMG_1162.jpg
Using a machined step and trig to set the cross slide angle. I measured the diameters, and then calculated how far the top slide had to move to get a zero reading on the other step. It takes time to set up, but provides very accurate results.
IMG_1162.jpg (73.71 KiB) Viewed 10805 times
IMG_1167.jpg
Machining the tapered bore using a cermet insert. These make an excellent finish.
IMG_1167.jpg (72.29 KiB) Viewed 10805 times
IMG_1170.jpg
The finished chuck
IMG_1170.jpg (47.77 KiB) Viewed 10805 times
Regards

Dazz

User avatar
Bogus105
Posts: 21
Joined: Mon 16 Jul , 2012 9:07 am
Hardware/Software: Viceroy T.D.S 1/1 GBL and TSA-16 lathes, Klopp 300 metal shaper, RF_45-like chineese benchtop mill machine
Location: Poland

Re: ER32 Chuck

Post by Bogus105 » Sat 25 May , 2013 21:16 pm

hi Dazz,

can you tell me more about spindle thread? Witworth? BSF?

User avatar
dazz
CNC Expert
CNC Expert
Posts: 237
Joined: Sat 19 Aug , 2006 11:31 am
Hardware/Software: Viceroy TDS 1/1GB lathe, Imperial, stripped down and rebuilt.
Viceroy Taper/Tracer attachment, Shop made cross slide tracer attachment, VSD.
Location: New Zealand

Re: ER32 Chuck

Post by dazz » Sun 26 May , 2013 6:51 am

Bogus105 wrote:hi Dazz,

can you tell me more about spindle thread? Witworth? BSF?
It's like a Whitworth thread with flat tops on the external spindle thread.
Look at this post viewtopic.php?f=50&t=886
I would strongly recommend making a replica of the spindle thread to check the internal thread for fit.
You do not want to remove the workpiece only to find that it won't fit the lathe spindle.
Regards

Dazz

User avatar
Bogus105
Posts: 21
Joined: Mon 16 Jul , 2012 9:07 am
Hardware/Software: Viceroy T.D.S 1/1 GBL and TSA-16 lathes, Klopp 300 metal shaper, RF_45-like chineese benchtop mill machine
Location: Poland

Re: ER32 Chuck

Post by Bogus105 » Mon 27 May , 2013 16:12 pm

Thread replica would be very helpful, but how to make it on my metric lathe?? If it was imperial version it would be easy to use MT3 arbor with a steel sleeve mounted on it, and cut 8tpi thread on 38.1mm O.D. and then skim it down to exactly the same O.D. as on spindle nose. Mine is metric.

User avatar
dazz
CNC Expert
CNC Expert
Posts: 237
Joined: Sat 19 Aug , 2006 11:31 am
Hardware/Software: Viceroy TDS 1/1GB lathe, Imperial, stripped down and rebuilt.
Viceroy Taper/Tracer attachment, Shop made cross slide tracer attachment, VSD.
Location: New Zealand

Re: ER32 Chuck

Post by dazz » Mon 27 May , 2013 20:19 pm

Hi
I had a similar problem with making the metric collet holder thread on an imperial Denford. My solution was to get someone else to make the metric thread on their metric lathe.

You could get a set of change gears to convert from metric to imperial but it would be cheaper to convert to an electronic lead screw (ELS).

No easy answers on this one.
Regards

Dazz

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