complete arc on a machining center lathe

[cuz1007]

Is it possible to machine a compete arc on a machining center lathe using g code. what i mean is a complete circle from 0 to -180 degrees???? I would appreciate any suggestions.

[Geof]

Yes, but in doing so you will cut your work off.

[beege]

Originally Posted by cuz1007 Is it possible to machine a compete arc on a machining center lathe using g code. what i mean is a complete circle from 0 to -180 degrees???? I would appreciate any suggestions.

What control? I think "yes" but the tool may be a gating factor. The only tool that would work in one command is a full radius groove tool. Wouldn't necessarily cut off, unless you wanted a spherical ended part.

Try, without TNRC for now,

G01X.5Z0 (will start radius here)
G03Z-1.K-.5 (swing radius with center point at X.5Z-.5)
G01X5. (or whatever, just to clear)

This will result in a radius of .5 minus half your full radius tool width. I don't advise it, however, for high precision turning, as you may have to compensate for lost motion at the halfway point.

Also, instead of K-.5, try R.5 ... both should work. Your control may REQUIRE turning radii by quadrant. Check your manual

[cuz1007]

thank you guys for your input. the arc question was not a specific part we are working on in the shop, I was just currious about it. We machine products for the pipe fitting industry such as 30, 45, 55, 90, degree elbows , flanges, tees, crosses, reducers, just to name a few. diameters ranging from 1/2'' to 24'' we machine from castings and forgings not bar stock or billets, therefore I have to edit many programs. I'm not a programmer, but consider myself a set up guy who can edit well. I sure have some questions that need answerd and would appreciate any help.