Multipule offsets for ID and OD threadmilling

Captdave · Mar 3, 2017

Once again the lathes are slammed with work and we need to make some threaded hardware for one of our products.

So here is my plan...saw slugs, fixture and threadmill 10 parts with a male thread OP10 and another 10 female thread OP20 at the same time. It just occurred to me that I would need 2 offsets (normally do OP10 in the lathe bar feeding) but a quick glance at the tool table in the Okuma P300 control I only see one radius offset available?
Haven't had the time yet to grab a manual but have to think is doable

Any quick tips?

deadlykitten · Mar 3, 2017

i can machine this without offsets ... what else should i say ?

Myrmidon · Mar 3, 2017

I am with deadlykitten (stellar name btw), can't see why 2 offsets would be needed. Radius of the tool is static, Or should be?

Can you provide more explanation of what you mean?

Worst case scenario IIRC Okuma has programmable data input, you could G10 a different R value. I can't remember it might not be G10 on Okuma, but almost dead certain it has the functionality.

Captdave · Mar 3, 2017

Since I have never done both ID and OD threads with the same tool in the same program perhaps I'm overthinking this. My assumption is that the tool pressure maybe different from cutting a OD thread ( larger radius ) versus a ID thread ( smaller radius ) but perhaps not. Like I said haven't done this before and just trying to get out ahead of this if there is a problem.

Thanks for your input.

Myrmidon · Mar 3, 2017

Assuming you are following the same process for ruff/semi/finish, no.

Deflection will not be incredibly different in my experience, outside of massive size differences and other factors I don't think apply to this scenario.

Red James · Mar 3, 2017

ID and OD threads will have different pitch diameters. Just program as appropriate; only one radial offset needed for the tool.

lspotts38 · Mar 3, 2017

In your tool offset page, there are three offset registers for each tool available (length and diameter), they are tagged HA,HB,HC and DA,DB & DC. D's are diameter comps, H's are length comps. In your program, you can then call offset G41 DA for the comp on the ID feature, then use G42 DB for the OD feature. Adjustable independently.

deadlykitten · Mar 4, 2017

Myrmidon said:
I am with deadlykitten

whatever happens, i am with sir captain captdave

till the ship gots drown

Myrmidon said:
IIRC Okuma

what means IIRC ?

toolpath is a helix, just like when machining a o20 with a o10 mill

... pitch as thread requires
... no more a complete loop at the bottom
... if OD thread, than aprroach, and exit, from outside the toolpath
...... else ( ID thread ) , than aprroach, and exit, from inside the toolpath

stuff above works for bought tool types :
... T type, with teeth all over the diameter, like a normal T endmill ( tool is simetrical )
... insert type, thus tool is not simetrical; rotation = revolution ( do you have this option ? )

do not worry about pressure : gentle depths should get you to that island with mermaids

Captdave · Mar 4, 2017

lspotts38 said:
In your tool offset page, there are three offset registers for each tool available (length and diameter), they are tagged HA,HB,HC and DA,DB & DC. D's are diameter comps, H's are length comps. In your program, you can then call offset G41 DA for the comp on the ID feature, then use G42 DB for the OD feature. Adjustable independently.

Awesome! That is what I was looking for!

Mtndew · Mar 6, 2017

deadlykitten said:
what means IIRC ?

iirc = If I Recall Correctly

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Multipule offsets for ID and OD threadmilling

Captdave

Titanium

deadlykitten

Banned

Myrmidon

Cast Iron

Captdave

Titanium

Myrmidon

Cast Iron

Red James

Stainless

lspotts38

Aluminum

deadlykitten

Banned

Captdave

Titanium

Mtndew

Diamond

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