Trocoidal milling

[Jon Guck]

Is Mastercam working on anything to support

trocoidal milling?Or is there something already in place.

This type of milling pattern is used often

in hard to machine materials,like titanium,and stainless.The endmill actually

spirals forward into the material.

I've seen this cycle offered in other packages.

[This message has been edited by Jon Guck (edited 03-19-2001).]

[Charles Davis]

Already there in 8.1.

They are called high speed loops in Mastercam, and spriral the tool whenever it would be buried in the cut (both sides of cutter in contact with material).

This is in the 3D machining roughing cycles.

[Jon Guck]

I have tried the High speed loop,in pocketing,but did not get a true trocoidal path.I've seen other packages that will clear

out pockets,etc with a toolpath with no linear moves at all,everything is spiraling.

Thanks for the feedback tough.

 

[Guest CNC Apps Guy 1]

Forgive me if I'm wrong, but isn't the point to have even pressure on the cutting tool especially in the tougher materials like the High-Nickel, Cobalt Alloys? If there were no linear moves in the toolpath, the tool would be entering and exiting the material in an interrupted manner right?

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James Meyette

[Allan Brown]

Try enabling "Minimize tool burial" and "Spiral inside to outside" in the Surface/Rough/Pocket High Speed cutting method.

[Glenn Bouman]

I tried the Trochoidal cutting today and it worked excellant.

Used 1/4" 4 flute endmill buried .4 deep in 4140 tool steel.

 

6000 rpm and 30 ipm.

Loop radius of .02 and a .01 Loop spacing.

Looked like it was cuttng butter.

[cadcam]

Glen what type of machine?

[Glenn Bouman]

Small 20" X 10" Leadwell 40 taper Fanuc OM control

This cutting method lets you do wonders on a light-duty machine. Low cutting forces.

[Lucky]

Glen - thanks for listing the parameters you are using (speed, feed ,loop length, etc). I will use this info as a starting point for our applications. Parameters for trochoidal milling are very hard to find from machine manufacturers and tool suppliers.

 

We wish to use this technique for milling harder materials (50-58 Rc). Do you or anyone else have recomendations? We have a Mikron HSM with 42,000 RPM spindle. We are cutting S7, H13, M2, and 420SS mostly.

 

Thanks

[Glenn Bouman]

My application was cutting a slot with one pass. The loop radius would be slot width - tool dia / 2

 

Trial&Error is the best teacher.

 

Since Trochoidal cutting is not available in contour I had to remove a pass from a pocketing pass.

 

High speed machining is all about light cuts.

The advantage of trochoidal is that you take light cuts and still utilize the full length of the endmill and not just the tip.

 

[ 06-12-2002, 07:41 PM: Message edited by: Glenn Bouman, In-House ]

[Lucky]

Thanks Glen