MadModder

Gallery, Projects and General => Project Logs => Topic started by: dvbydt on August 10, 2011, 04:00:14 PM

Title: Table mounted collet chuck.
Post by: dvbydt on August 10, 2011, 04:00:14 PM

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

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/ColletChuck.jpg)

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

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/Body.jpg)

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.

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/Components.jpg)

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.

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/Facing.jpg)

One of these :-

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/BlankEndMT2.jpg)

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

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/SpigotMT2.jpg)

So, I can now mount chuck on the table,

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/TableMounted.jpg)

or on the rotary table.

(http://i757.photobucket.com/albums/xx213/dvbydt/Engineering/Collet%20Chuck/RotabMounted.jpg)

That will hold from 2mm to 20mm dia.

Thats all my modding for Today's post!


Ian

Title: Re: Table mounted collet chuck.
Post by: Bernd on August 10, 2011, 04:22:34 PM

Very nice Modding Ian.  :thumbup:

Bernd

Title: Re: Table mounted collet chuck.
Post by: Stilldrillin on August 11, 2011, 02:17:35 AM

That's cute, Ian!  :thumbup:

A handy little weapon. Well done!  :clap: :clap:

David D

Title: Re: Table mounted collet chuck.
Post by: sbwhart on August 11, 2011, 03:01:02 AM

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

Thanks for showing.

Stew

Title: Re: Table mounted collet chuck.
Post by: raynerd on August 11, 2011, 03:15:44 AM

That is a really smart idea!

Chris

Title: Re: Table mounted collet chuck.
Post by: Pete. on August 11, 2011, 04:38:27 AM

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

Title: Re: Table mounted collet chuck.
Post by: Davo J on August 11, 2011, 06:50:30 AM

Nice job, :beer:
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

Title: Re: Table mounted collet chuck.
Post by: dvbydt on August 11, 2011, 05:09:27 PM

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

Title: Re: Table mounted collet chuck.
Post by: Davo J on August 12, 2011, 06:12:45 AM

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. :beer:

Dave

Title: Re: Table mounted collet chuck.
Post by: dvbydt on August 12, 2011, 05:28:23 PM

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