Table mounted collet chuck.

[dvbydt]

When I ordered an MT3 ER32 collet chuck from CTC I also got a 20mm plain shank one like this :-



The shank was removed with a cut off disk in an angle grinder, leaving this :-



Next the outer body was turned and drilled. Originally I intended to shrink fit it to the chuck, but it seemed a shame to
ruin the finish, so I uused JB Weld and two grub screws.



The cut off shank was mounted in the 4 jaw and trued up. Using a 20mm collet in the assembly, it was faced
and bored out to 16mm.



One of these :-



was turned into a 16mm spigot for the rotary table.



So, I can now mount chuck on the table,



or on the rotary table.



That will hold from 2mm to 20mm dia.

Thats all my modding for Today's post!


Ian

[Bernd]

Very nice Modding Ian. 

Bernd

[Stilldrillin]

That's cute, Ian!  

A handy little weapon. Well done!  

David D

[sbwhart]

Now thats a neat idea far better than my method of doing the same thing.

Thanks for showing.

Stew

[raynerd]

That is a really smart idea!

Chris

[Pete.]

Nice job Ian. I like te dividing-head centering stub.

[Davo J]

Nice job,
Just a suggestion
If you open it up to 20mm all the way through, the maximum size for the ER32(20mm) stock could go right to the bottom. It would mean making a new 20mm spigot though.

Dave

[dvbydt]

Thanks for your interest guys.
Dave, yes I did go through that idea but the soft end arbor was not big enough where I needed it. So, I decided that I would just use a table mounted 3 or 4 jaw chuck when necessary.
The concentricity errors build up so that it is about 0.10mm (0.004")  TIR, but this can be reduced to 0.03mm (0.001") with a tap from a soft hammer.

Ian

[Davo J]

If you ever have a need to use the full depth, you could shrink fit a larger piece into you arbour.
Nice work with what you have done though.

Dave

[dvbydt]

Yes Dave, I may do that. It has the advantage of being able to finish machine the spigot diameter on the mill, so getting it more concentric.

Ian