Posted by BillS on August 29, 2007 at 17:02:13:
In Reply to: anyone who know's something about Adams thread millers... posted by Eduardo L. on August 28, 2007 at 17:13:18:
Are you trying to setup and operate or repair the machine?
If you are not at all familiar with thread milling, here are some thoughts:
Manual thread milling machines are simple to setup and they are pretty much all the same - there are variations according to manufacturer of course.
You must know the machine's lead constant. And, you should have an inventory of change gears that came with the machine.
There is a set of 4 (or 6) change gears that, combined with the machines built-in lead constant, must match the lead of the worm you are cutting. Usually there is a shift mechanism and/or a second set of auxiliary change gears that extend the range of possible leads that can be cut.
Next, the PA and point width of the cutter must match the thread profile you are cutting. Cutters are radial milling-style cutters with a rack-form profile. The point width usually works best if it is slightly smaller than the width at the root of the worm.
Part of the setup process is setting the milling head angle to match the hand and the lead of the worm. This angle should be calculated for each different worm spec.
A complete mill has an index mechanism that allows you to cut more than one lead. After each complete cut, the machine is indexed manually to the next lead entry point.
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