Are you feeding from the bottom up and using a multi flute thread
mill? You could switch to a single point thread mill. Other than
that if you arc into the thread at the bottom with a multi-flute
thread mill at a fixed Z level all of the initial cuts will be the
pitch apart so when you start helix motion up the cutter will
engage the initial in feed marks and clean them up. The end of the
arc needs to finish on center so your approach down the hole needs
to be off center at the point of the start radius.
Norman Barilleaux - CNC Programmer
UTC AEROSPACE SYSTEMS
2005 Technology Way San Marcos, TX 78666
TEL: +1 512 754 3703 FAX: +1 512 353 4928
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From: Paul Guariento [mailto:[login to unmask email]
Sent: Wednesday, December 11, 2013 3:11 PM
To: [login to unmask email]
Subject: [External] [manufacturing] - Macro limitation for thread
Hello, A customer is having a problem...Is there a way for the
approach/retract circular macro to follow the thread pitch? Helix
isn't available, just a circular motion; changing the Angular
Orientation isn't working well enough, the Apr/Ret are still
gouging the threads because the circular motion is horizontal, not
following the pitch of the thread.
A helical move would be good (I think), but I fear the customer may
have to change tooling or redesign the internal thread (by
undercutting the thread?) in this .500in dia x .500 deep hole.
Anyone else have this issue? Is there a way to change the circular
move to follow the thread and not gouge?
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