Thread Milling on M32 sub. without Y axis.

[SWISS-TECH]

I am still confused why you would need a y-axis and why the helical is a problem. When you rotate c-axis that is just like moving x and y in a mill.
When you are thread milling in a mill your tool is not positioned on an angle.I have thread milled several parts in a star machine using c-axis and the parts looked fine and checked fine.

[cogsman1]

SWISS-TECH is correct you do NOT need to have the "Y" axis to threadmill. The tool would be made with all the angles in it either way. Somebody seems to be confusing Thread Whirling with thread milling.

[CNCRim]

Originally Posted by tejano4life72 Thank you for the replys, ok i have read all of your replys but here goes a nother question. Same question as above but the thread being off center. I have a friend that is trying to thread mill an off center hole just using X,Z, and C axis. Can that be done and has somebody actually done it. The machine makes the movements but it is leaving a 2 flats on the major of the threads.

the simple answer to your question is "Yes" but you need CAD/CAM to generate the toolpath/will take you forever to convert Y coord to angle.

[cogsman1]

You will NOT need to convert the "Y" axis commands yourself when using the Milling interpolation option. The control will do the work for you. (G12.1)

[tejano4life72]

I know that G12.1 will convert C to Y axis. But will it work on a off center hole? I know the turret will over travel. But if it didnt over travel will it still work. Having X,C, and Z working together on a offset hole? G12.1 works good on X and C "Y" but how about all 3 axis.

[CNCRim]

yes, you need to order option 3 axis move to do XCZ move.

[ghyman]

Yes, I have done it, exactly what you're referring to...
thread milling
internal thread
off-center
using the turret
on the sub
of an M-32
without a true Y-axis.

And here's the helpful part...
It was five years ago, and I don't have a copy of the program. (previous employer)

22-13-5 stainless was hard on taps, it milled much easier.
And we were making small pressure fittings, so threads without flats/scallops was essential.

iirc, it was pretty straightforward...
rapid to cl of hole
lock spindle in milling mode
rapid to (depth - 1 thread)
helix move to majorØ over a Z length of 1/2 thread lead (Important, to keep the thread crest from getting truncated)
helix move to depth
helix move out to cl of hole.

That being said, your code looks very strange to me:
M_V$WSP$13
TRANS_OFF
If this is what is posted, does it actually work?

My apologies for not having the code handy... it was literally 5 years ago, and I haven't laid hands on a CinCom program for at least three.
But half the battle is knowing it can be accomplished, yes?

I will look through my notes from back then and see if I can find something a little more helpful...

[tejano4life72]

That code will look strange to you ghyman cause its not for a citizen, its for a DMG Gildemeister twin 65 machine. My friend is trying to do it on thier. I just figure if the citizen can do it that machine should be able to do it. I want to thank everybody for their input.

[JMS4287]

Been There And seen that As well....To elaborate on what Cogsman was justs saying....On M32's with out a Y2 Axis more than a couple years old....Y2 is actually TI...If you try calling a Y command when not in milling interpolation the control will take a Y command but will try to move the TI axis to where ever you told it...with the Turret still clamped....if you lucky TI will overload before any damage is done...but not ussually the Case..this shouldn't be the case on any newer M-32's I believe this has been addressed by Citizen...

[cncswiss1]

threadmilling with CZ is cake

RAPID TO C0 Z-(CLEARANCE) AND X0
FEED INTO THREAD FULL DEPTH
FEED INTO WALL AT LOW FEED (MAJOR-TOOL DIAMETER) F~1.0
W-(2*PITCH) H-720.. (SPIN TWICE )
RAPID TO X0
GET OUT OF HOLE

WORKS GREAT, BEEN USING IT FOR YEARS, THE GREAT PART IS THE X OFFSET SETS THREAD DIA, DON'T HAVE TO MESS WITH THE R OFFSET

[PacNWSwiss]

Swiss-Tech is using a live thread mill as a single point boring bar, but using inch per minute and one C rotation per pitch in Z(incremental). this works great on center. Thread mills may be expensive but I have got over 40,000 full thread form parts off one mill in Titanium using this method(4-40,2-56,0-80). Different parts require multiple methods. Also You can use G32 if your machine Spindle can be commanded low enough to get the proper surface footage(G32 taper off on the hypotenuse). Off or on Center I tend to start in mill interp(G12.1) much like the program posted.