Draw Bar For Atlas Mill

[vtcnc]

I saw no need for using a hollow tube, there is nothing I run that requires it. The all thread serves to hold the mandrel in place, that's its' only function on either milling machine.

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I believe he is referring to the arbor spacers when he mentions the hollow tube.


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[wa5cab]

Possibly. Although I thought that he was thinking of a draw tube as used to tighten collets like the 3AT, 5C and similar types.

 

[Bi11Hudson]

There are many collets that use drawbars(drawtubes) when used on a lathe. On a lathe I could see the purpose of a hollow drawbar. For the Atlas horizontal mill, I can see no purpose. To make the hollow drawbar, one could start with a "shot out" .22 cal barrel and cut it down. There are many Ruger 10-22s around that aren't up to hitting the broad side of a barn any more. Or a solid BB gun, one of the high pressure types. The 0,177 bore would give a better starting point for a 3/8 drawbar. And a lot eqasier to acquire in todays paranoid world. No dealing with the ATF for a "used" barrel. . . If desperate, one could buy a new BB gun and cut it down. Expensive, but available at Wally World on very short notice. . .

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[vtcnc]

I dropped and lost the bushing for the draw bar on my Atlas mill. I mean the bushing with a through hole for the draw bar shaft and a taper at the end that contacts the spindle. I spent 3 hours on my hands and knees looking for it. I took the change-o-matic assembly off and looked everywhere inside. It has vanished. I think it fell through a worm hole into a parallel anti-matter universe and is being tossed around by Schroedinger's cat.

Can anyone point me to a drawing of the bushing? I just need its overall length and the length of the taper.

Thanks

You might take a peek behind the coolant pump cover. I found remnants of a gear down in there from the change-o-matic.

 

[vtcnc]

Possibly. Although I thought that he was thinking of a draw tube as used to tighten collets like the 3AT, 5C and similar types.

I have to make the whole drawbar. It was missing when I got my mill. A made the 1” arbor already but still have to fab the spacers. Looking for some heavy wall tubing to start with.

That is how I interpreted his comment above: the heavy wall tubing was for making the spacers. I think this idea of trying to make a drawbar from the OP got mixed up with this comment from another member about making the spacers for his arbor.

 

[Harley80]

Sorry about that! I was writing what I was thinking!

 

[wa5cab]

The two cleaned up arbor drawings and the drawings for some of the spacers are in Downloads.