[mrquacker]

So I finally got a carbide bit that allows me to max out my 770 at the full 10200rpm and 135ipm x/y feed. 3flute 3/8" aluminum finishing EM, 0.03" WOC, .25" DOC.

That cut pulls only 1/2hp according to gwizard. Anything more than that and the toolholder pulls out of the tts collet. I can get similar MRRs with lower speeds, but its not nearly as fun to watch

So anyways, now for the n00b question: is running it at max "bad" for the machine? Do you get more wear/tear/etc going 135 as opposed going 80? What about the high speed trochoidal cuts? Where the machine is concerned, is it better/worse to use those over normal milling? Or does it make no difference?

Thanks,

[concombrefrais]

It may accelerate wear and tear but I would not be too worry. You can change the bearings anyway.
Any video?
C.

[Steve Seebold]

I am running a 1 inch single flute Shear Hog as a fly cutter at 4000 RPM, 50 IPM and .05 DOC. Working great so far. The insert in the Shear Hog is a year old, and has never been rotated. I'm using a mixture of 25% A9 mixed with WD40 for lubricant.

Not a big enough cut/part to worry about heat.

I used to run the same cutter in my FADAL at 10,000 RPM, 100 IPM and a
.200 DOC, but I had 22 HP to spin it with.

In that case, it didn't make chips, it made chunks.

[dbrija]

I don't run max rates just to avoid possible lost steps...

[riabma]

2 mpm for facing and roughing operations, and I never had a problem. Of course, always with light cuts. For example with a 12 mm end mill: 4 mm DOC for plastic and 1.5 mm for aluminum. 50% engagement.
I do not know about spindle load or HP. I use for reference the music that the machine makes.

[andrew2]

I don't run max rates just to avoid possible lost steps...

Do you ever get lost steps with the tormach?

[rowbare]

That cut pulls only 1/2hp according to gwizard. Anything more than that and the toolholder pulls out of the tts collet. I can get similar MRRs with lower speeds, but its not nearly as fun to watch

Have you ever read Tormach's Preventing Collet Slip?

If you have had repeated pull out issues, your R8 collet might need replacement. It is considered a wear item.

bob

[dbrija]

Do you ever get lost steps with the tormach?

Not that I have noticed.