Here ...

http://www.practicalmachinist.com/vb...98&postcount=1

... is J King's shopmade Sjogren, made using "found" materials, the planetary gear system from an automatic transmission, no less.

Perhaps this should be called an Auto Magic collet chuck?

But then we would have to 5AM collets to go with it :-) .

Just about the only thing lacking in this very, very nice implementation is an external 2-3/16"-10 or, optionally, an external 4º taper, for use with Hardinge's step collet system.

See Russ' sticky ...

Step collet chuck

... for an example of a shopmade step collet chuck.

Holly crud my god thats awesome seriously that is sweet the thought of making somthing like that would never cross my mind I made a radius turning attachment and some other stuff but a real collet chuck no way. That is beautiful, I have a sorgen or whatever and always wondered what was in it now I know.

Wow.I was surprised to see this resurface.I once again thank everyone for the kind words.Gee.even on a sticky! I am glowing right now.


Jim

You ought to be Jim.....that's quite a piece of work.

Mr. King:

Your collet chuck is an exercise in exquisite, innovative yet practical engineering.

My hat is off to your sir!

Best Regards,

Amigo

I have "harvested" J King's photos in case they should disappear and have appended these to this thread.

J King's original text follows.


Finally got this thing done. I really wanted one of these for the lathe. Way to pricey for me so I made one. Didnt want a draw bar type so I figuged out and designed my version. I used a planetary gear out of an automatic transmission. First I tried to use the whole gear cluster housing but there wasnt room for bolts to clear the 4 gears. So me being the wiz made a new gear cluster housing using 3 planetary gears. Came out nice but didnt work! Using only 3 gears spaced around the center gear and inside the outer gear caused the gears not to mesh. Dang. Back to the drawing board. I then removed 2 gears and all was well. Made 2 dummy blanks to take the place of the 2 missing gears to balance all.

Hey Sandman. There is your aluminum piece I bought off you for the handwheel.

I also had to make the D1-3 mount. That was easy to fit. I was worried about getting a perfect fit as it would determine the repeatability once was removed and then reinstalled.

Assembled all and nevously did final assembly and it runs true. I am super pleased! Wanted to show this off since it has been such a project..

Here are some pics of pieces and one of the completed chuck.

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Conclusion of J King's photos.

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