FILENAMES:

Drawbar1.jpg
Drawbar2.jpg
Drawbar3.jpg
Drawbarcomplete.jpg
Drawbarparts.jpg
Drawbarsketch.jpg

DESCRIPTION:

These are pictures of shop made collet drawbar for a lathe. 
Posted by Roy Hauer <chipmkr@hotmail.com>. Roy provided the 
following description:

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5C Collet Closer // Drawbar assembly

Total of 4 Images - files:

Drawbarsketch.jpg Sketch of drawbar assembly.

Drawbarparts.jpg Composite image of major parts after machining 
   but before assembly.

Drawbarcomplete.jpg Completed and assembled drawbar.

Drawbarinfo.txt (this file)

After wanting a drawbar for some time, and the many tips given in 
rcm, this is what I made to suit my purpose.

So far it has worked great. While it is made for 5C sized collets 
it could easily be modified for other sizes as well.

Any dimensions  if given are those that I used in the construction 
of this item, for use on a Jet 1340 GHB lathe. Modifying dimensions 
to fit any other model lathe should not be a problem, and the intent  
of these images and drawing is only to give another's ideas used to 
construct a  collet closer assembly.

NOTE:

The little gray cylindrical objects pictured under some of the components 
are "push pins" and were used only to elevate the components so that 
the scanner could scan the item better. They are not part of the drawbar 
assembly.

Drawbar tube was constructed out of .250" thick wall 1.525" tube, turned 
down to 1.495" to clean it up.

The thrust bearing retainer is simply a piece of alum (6061 T6) that is held 
in the recess, with 3 setscrews.

The bore of this retainer is slightly larger than the flange on the 
handwheel adapter.

All other parts are made from whatever just happened to fit the need, that 
was lying around the shop. I obtained the thrust bearing and 2 hardened 
washers from my local bearing supply house. Total cost $3.85. They are made
by Torrington, and the OD on this bearing is 2.1887" with a 1.500" ID, and 
two .030" thick washers. The handwheels hub has a hole to accomodate use of 
a spanner wrench if necessary. This feature has proven its worth and was 
added later after a bit of use.

I took advantage of using as large a drawtube as  possible to fit inside the 
spindle's  bore, and give me an ID suitable to cut internal threads for 5C 
collets. By utilizing a larger diameter drawtube, it reduced the space between 
the drawtubes outside  diameter and the spindles bore  inside diameter, so 
I went with a thrust washer // spindle adapter that fit the OD of the spindle 
itself. A collet stop and use of the largest 5C collet is able to be used with 
this drawbar setup.
All components except drawbar tube were black oxide treated before final 
assembly.

This project was rather enjoyable to make and only took a couple of hours. 
Sorry about some of the images, only so much you can do using a scanner 
like a camera!

Roy Hauer aka Foxeye
chipmkr@hotmail.com