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Thread milling diameter
Hello
I'm trying to thread mill in steel. I need to make a bunch of M8 holes.
In my drawing the holes are 6.8mm. I also drilled the holes 6.8mm
But how does the threading option work?
I entered the pitch (1.25), if I enter the diameter of 6.8mm it won't cut away enough material.
Do I need to enter 8mm? or how is this being calculated.
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"Pitch diameter offset" will make your day. In your case, 1.2mm.
David
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Thanks, that seems to work
Tool plunges in and cuts thread from the bottom to the top
second pass also a straight plunge
third pass it moves off center before plunging in. One flute touched the part and got damaged...luckily the tool itself is still 'alive'.
How can I prevent the tool from making horizontal movements when plunging in?
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Edit
Enabled lead to center, that should solve it.
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Ok that seems to work
I have thread which looks good. Only it's too small, can't insert a m8 bolt.
Cutting diameter of the tool is setup right.
Or did I made a mistake by drawing the hole 6.8mm?
Should it be 8mm in the drawing? And then setup the thread cutting for m8.
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Most thread mills have a slight corner radius on the cutting edge so it doesn't chip as easily but most CAM expect a sharp V. In all my years of thread milling I have all ways used wear comp and adjusted the tool at the machine to get it to check with a thread gage.
If your machine doesn't have tool comp the adjust the pitch offset till it gages correct. Also, check your lead in/out values to insure the tool doesn't make contact with the wall.
You modeled and set up it correctly.
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thanks I will check the wear comp
Bolt almost fits but it needs another pass with the thread mill to make it a little bit bigger
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On "Linking" tab, check "Lead to center" if you haven't done it already.
Most threading tools must be compensated about 0,06-0,08 mm.
David
Edit: I apparently didn't read all of the above. Double info.![]()
Fusion