Any Tips? (Mill/turn center)

[Mr. M]

I need to make a part with on odd thread on it.

It ha .54 od, .420 thread Root,.5 pitch, 60deg on one side 30deg on the other.

I would like to use an endmill to cut it tipped 30 deg down and rotate the C-axis as I move the tool in Z.

.

.

any ideas on how to program that?

[Greg Williams]

5 axis curve, You will need to create a helix in wireframe first.

[Rick Henrickson The Boeing Co.]

isnt that a pressure thread? check with sandvik they may have an inserted cutter for it.

 

you may have to make more than one pass at a diffrent start point to get the land size correct

[Redfire427]

This might be a dumb question, but doesn't the endmill have a 90 degree included angle even if you tip it at 30 degree? In other words, only one side of the thread would be correct.

Perhaps I mis-understood.

[Mr. M]

30+60=90

[GoetzInd]

Perhaps unroll the helix and use a regular countur path w/ axis substitution. Tilt your T/C plane to get your angles.

 

Mike

[Mr. M]

quote:

---

5 axis curve, You will need to create a helix in wireframe first.

---

.

.

Ok I got that and a line at 30 deg to control the line angle. But how do I set it to only move the Z and C for making the cut?

.

Thanks All

[cam-eleon]

Mastercam won't know the curve is a constant needing only a single Z/C move to get to the end. Muti axis programming spits out all req. vectors within the step/chord tol settings. I cut very large threads and I end up deleting most of the output and sub in a W and H.(incrmental Z and C).

Maybe a custom post is the answer.

[Travis Adam]

I have done threads like this by in feeding at 60 degrees with a TNMG turning insert with a 1 radius. A regular threading insert with a radius will work too but I found the TNMG worked better. You probly need to use G32's if your machines won't allow for more than 45 degree infeed in a canned cycle. You also have to take more passes than a normal thread, but sure beats milling it.

[Chris Wichlaz @ lpmachine]

What we do is EDM a threading insert out of a top notch ot a differnt style threading insert. The wire EDM would be able to put all the proper relief angles on the edges of the tool and also put the proper helix angle. If we use a top notch tool we start with a horizon HGP3187R.

[crazy^millman]

Ok folks very easy to do what you are after with the endmill. The thing to do is create the control surface that will control the toolpath. Create a helix. Then create a triangle that will be the bottom of the surface. Now sweep that closed triangle along the helix. This will create a helix. Now you can create a surface from that solid to use as the surface for the curve 5 axis. This will also act as the surface for the tool axis control. Will need to offset to the left by the radius of the tool and all should be good.

 

Here is a snippet of code:

 

code:

---

Z-.3318 C256.8212 B61.3681

Z-.3331 C255.8766 B61.3679

Z-.3344 C254.9317 B61.3678

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Z-.5589 C93.32 B61.3683

---

The reason for the B movement and difference in angle is the attempt to keep the tool normal to the surface. Not an easy toolpath to control things. I would probably just do a C axis ramp toolpath. Then just edit the code to do a B axis tilt, but it will do what you are after, just have to think outside the box a little is all.

 

HTH

[crazy^millman]

Oh yeah I put the file on the FTP in the mcx_files folder it is called:

 

CRAZY_THREAD_MR_M.zip

 

HTH

[Mr. M]

Thanks Crazy!