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
CNC Expert
Attachments:
- My design for an ER32 chuck.
- er32 Chuck.GIF (20.6 KiB) Viewed 32197 times
- The collet nut end before threading.
- IMG_1135.jpg (54.67 KiB) Viewed 32198 times
- 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 32198 times
- Lots of chips.
- IMG_1120.jpg (133.49 KiB) Viewed 32198 times
- Drilling out the workpiece.
- IMG_1119.jpg (88.12 KiB) Viewed 32198 times
- 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 32198 times
- 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 32198 times
- 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 32198 times
- Machining the tapered bore using a cermet insert. These make an excellent finish.
- IMG_1167.jpg (72.29 KiB) Viewed 32198 times
- The finished chuck
- IMG_1170.jpg (47.77 KiB) Viewed 32198 times
Regards
Dazz
Dazz
CNC Expert
It's like a Whitworth thread with flat tops on the external spindle thread.Bogus105 wrote:hi Dazz,
can you tell me more about spindle thread? Witworth? BSF?
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
Dazz
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.
CNC Expert
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.
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
Dazz