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Ok i followed this http://www.youtube.com/watch?v=w54DywBujVU]Mastercam Video Tip: Custom Thread Mill Tool and Verify - YouTube creating a tool is no problem. But don't i need to define the outside diameter of the tool somewhere?? the only place i can see to do this is under the tool>>edit tool but on this video it says to give this dimension as the shank +.010 clearance??
What i did was first cirlcle mill some 17.5mm holes with a 1/2" endmill in 1" plate. no big deal. Then i drew up the thread mill and set it up as an undefined tool. When i set it up i put the tool diameter as 17mm which is what it is to the outside of the cutter. Then i set the outside diameter of 20mm (in parameters>>internal thread dia.) cause its a m20x2.5 tap. When i verify i get a collision?? can't figure out why (it looks like at the bottom 2 threads) so for giggles i circle mill a .85" hole, and verify still shows threads?? wtf? .85" is bigger than 20mm? there should be no threads. What am i supposed to enter for tool diameter? major or minor an why? Also my last go around i can backplot the threadmill, but it will not show up under verify now. It just does nothing? I wanna give it a trail run but these inserts were $300. I wanna get it right before i do a real test. Oh ya i entered all standard dimensions converted from millimetres. M20x2.5 internal holes in a 17.5mm pilot
o.k. got the verify working again, had a small overlap on my drawing. Anyways i ran it using 17mm as the tool dia. It plunged to the bottom then screeched into the side?? I stopped it before i damaged the inserts. I odn't know if it was cutting to deep or not. About to run it again taking .050 cuts at a time. Cutting at 300SFM .002 thou load
So many variables to what you are asking.
I always draw my tools in mastercam, then save them into my toolbox and use them when I need to. This way you have the EXACT tool geometry so you get a perfect program.
And yes, you need to define the diameter.
Post the program and mcx file and somebody may be able to see what is going on with your issues.
wow, i figured out my issues after ruining 2 plates (no inserts luckily) The threadmill is listed as 17mm OD in the catalog and even in the part number. I mik'd it and it was .040 away from 17mm. I plugged in the correct diameter and away it went w/ no issues. The verify thing is still a little weird as it will still show threads is i bore the hole out larger than the thread size.
Anyways the other issue is plunging to the bottom and climb milling out. I get a lot of chatter. I can feed from the top basically like as single point and it works well. How much slower do i need when all 10 inserts are ingaged
That's not uncommon - this is why we always draw the tool in mcam.Originally Posted by poster
Not sure what you mean here but the verify threads should be a perfectly sized thread. Mine always are.
Can you just use multi-passes? Are you taking the entire thing in one pass? The tool mfr may have a recommended depth per pass.
Ya manufacturer recommends 60% then 40. i gave it ago but it seems a like too much still. I will play with it a bit more. It only takes 15 seconds for a hole starting from the top in one pass. So i really don't know how much time i will save making ten threads at once, but having to take multiple passes at much lower speeds?
I don't like the conventional milling though, sounds like lots of chips are getting cut twice. whether climb milling will change that, i don't know.
Ya i drew the tool using the dimensions in the catalog, which i would never think to be wrong. Good thing this is only a 2 flute cutter, a 3 flute would be tough to measure.
For that you can just drill a pilot hole and bore with the tool in question. That way you know exactly what diameter it will be.
It's good to do this anyway with an insert threadmill. Can you post a link to the catalog that had the dimensions?
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