I had to make a new draw bar yesterday. I machined a new one from a longer Bridgeport style with a heavier nut end and more thread engagement.
I bought a 20 1/2 " long Bridgeport bar, cut it down to 12 3/4" , drilled and reamed a hole in the nut end for just shy of 1" depth. Then tig welded the nut to the shaft.
I had to enlarge the hole in the top cover to fit it through. But its way better now. I feel more comfortable with having more thread engagement then I did prior.
How many threads of engagement do you guys have with your NM 200 Drawbar ?
Thread: Draw Bar
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08-12-2010, 12:19 PM #1
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Draw Bar
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08-12-2010, 02:24 PM #2
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I think I have 4-5 threads in collets, after turning down the top collar. No issues to date.
Did you switch to 3/4 nut from 12mm?
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08-12-2010, 02:58 PM #3
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Yes I did go to a 3/4 setup instead of the smaller 12mm.
Works awesome. Now I have atleast 9-10 threads engaged.
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