Left hand thread on lees bradner thread mill


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Posted by mike prida on March 21, 2007 at 13:03:04:

i'm cutting a 1.5"-4 twin lead acme screw, I cut the right thread and it came out nice now i need to cut the left the gearing is 30/84 x 21/120 for a 4 lead, an idler will not fit with this combination. I just doudled and reduced the 21/120 to 42/60 to be able to fit the idler in. The lead is no longer 4 it has changed. Do I do the same for the 30/84 also to get the 4 lead?


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