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Old 05-24-2005, 09:58 PM   #1 (permalink)
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? for the cnc programmers(conversational) about thread milling

I've got a Hurco VM2 that I've been training myself on. I can't figure out how to get the helix program to cut the correct threads for me though. I'm useless with gcode currently.

I'm trying to cut 1.25-12 UNF threads (building some funky inserts for some monster joints). It's cutting through 1.25 of material.

I grabbed the thread cutting tool off the lathe, insert type. Should my tool diameter be listed as the overall diameter that the insert cuts or should it be half?

A friend had plugged in a lead of .1041, but I think it should be .0833. Currently I'm getting a 10 thread pitch.

It's late and I'm missing a ton of what I wanted to ask, but I need sleep.
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Old 05-25-2005, 09:04 AM   #2 (permalink)
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Track down MC on this board. He might be able to help
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Old 05-25-2005, 09:25 AM   #3 (permalink)
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OD or ID threads? I well need to know what the distance is from the center line of your boring bar out to the tip of your insert.

Does your control take I,J,K or well it take R for the center point or a radius?


all your going is writing a line of code that well give you one turn around the part (G02 clockwise) go3 counter clockwise and on the same line post in a Z axis move of 1/14 (.00714) and then run the same code agion but go down .00714 deeper each time around .....


If you would like I can post the code if you give me the info on id/od and what your boring bar size ..... I can wright it to the old I,J code ( every thang well run it)

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Old 05-25-2005, 10:04 AM   #4 (permalink)
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Also are you rigid tapping, clutch tapping, or thread milling these? Keep in mind when you thread mill you want a approach angle ot blend INTO the cut or you end up with a flat at the start and the end of the cut. To ramp depending on the fanuc your using you should have a this type of program for 14 threads per inch

M6T? (calling the tool)
G84.1 (for rigid tapping)
Z.1 H? M8
G84.1 G99 R.4 Z-2. F8. S112
L101
G80

Duffycan tell you the same thing...hopefully this helps, that program is for rigid tapping only
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Old 05-25-2005, 09:00 PM   #5 (permalink)
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Thanks for the tips guys, but I actually figured it out in my sleep last night. Don't know if that's a good or bad thing

I was correct with the lead being .0833 (1/12). What I was having problems with mostly was my tool size or actually the radius that is was asking for in the helix. Figured out that it was the distance from the tip of the cutter at my zero out to the major diameter required(1.25). It turned out to be .1665

It's been so long since I've dealt with gcodes, I really need to start learning them again. I think I'm going to be running the edm soon anyhow. I'll probably start doing all the simple parts in gcode just to get reaquainted with it. I think I like conversational programing though. It's nice when the machine does half the calc's for you.

Just for reference for someone on down the road, we are running the ultimax controls on our hurco.
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