We see a line running down the threads at the point where the tool enters and exits the part.
External thread like a 2"-11 1/2.
Aluminum Bronze (tough like SS)
Vertical Mill
We currently run a helical path starting above the part and ramping in and out. The line has improved, but is still visible. We've changed parameters and holding fixture and have been told that's the nature of thread milling ??
Any thoughts appreciated.
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Thread Milling
(4 posts) (4 voices)-
Posted 3 years ago #
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That maybe play in the machine slides, or loose control algorithms also.
I thread mill about 4 dozen different thread sizes on a fairly tight machine with good control, and a handful on a not-so tight one with a control that doesn't have cutter comp, and don't have that problem. I think those that settle for defects in the thread have probably had little support when trying to use this method or just quit too early - most threadmill manufacturers will spend a lot of energy trying to help you be successful in your application.
You may try milling 1-1/4 turns and see if it takes care of it. May also tinker with the lead in/out to see what you can get out of it. I sometimes have to cut the thread the first time about .0005"-.001" small then go back for a finish pass.
Rgds,
JohnPosted 3 years ago # -
Meskan, have you considered using an attachment to roll the thread on your machine or a secondary operation using a thread rolling machine? Thread rolling is extremely fast and produces a higher quality thread.
Posted 3 years ago # -
I would like to put in my vote for thread rolling machine!
Posted 3 years ago #
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