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WTK RPM For 2 1/2 face mill

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chiroone

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#1
I purchased a 2 1/2 inch face mILL from grizzly. It is the one that has the four replaceable carbide cutters. I’m wondering what is a good RPM for steel and aluminum. I have the PM 835 mill so I’m sure it’s rigid enough
 

T Bredehoft

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#2
I don't have the speeds for your carbides on hand, but in aluminum you probably can't go fast enough.
 

benmychree

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#3
For steel, start out at about 250 SFM, or approximately 250 RPM; likely that could be increased, depending on what sort of steel it is and how easily it cuts, and of course, how the inserts hold up.
 

chiroone

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#4
Thanks, 250 RPM is a little slower than I would have expected.
 

benmychree

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#5
That is a starting point; try it and see how it performs likely you can run it faster; it is better so start low and increase than start high and wipe out the inserts. Perhaps my off the cuff recommendation was low, I've consulted my B&S cutting speed calculator for 100 BHN steel (soft), and they , which would be say to start at 450 FPM which would be 630 RPM; my mistake! For HSS, the FPM would be 150, the RPM would be 230.
 

chiroone

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#6
Thanks, I’m trying to cut 3/16 A36 hot rolled. So maybe I’ll try 250 RPM and see how that goes
 

benmychree

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#7
A36 should cut easily at higher speed.
 

P. Waller

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BFHammer

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#9
I was using my 2 1/2" facemill last night on A36 with my PM932. My face mill is a 45degree model with 5 inserts and I found the sweet spot to be around 670RPM with the set up I was using. I found that I could run at 8IPM or more and get good results. Depth of cut also plays into the equation - I found (strictly by trial an error) that a .015 to .025 depth gave me good results.

When I have used my facemill on aluminum I go as fast as my machine will go 1970RPM.
 

P. Waller

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#10
Kenna recommends up to 9000 SFM for some uncoated inserts in aluminum alloys with low Si with coolant.13000 RPM's at 2 1/2 inch diameter.

That is banging it hard, start low and over ride the spindle speed and feed as you go.
 

MarkM

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#11
Nice to see you up and running. I am sure there are alot of people interested in the 835s. So any hint of a review? In the market and this is one on the list.
 

ddickey

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#12
So was it able to hand the 2.5" face mill?
 

JCByrd24

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#13
My PM-30 handles a 2.5” facemill at 0.050” no problem, mine’s also a 45 degree type. I run 1500 rpm or a little less in steel and 3000 in aluminum. The SEHT inserts I have are unknown chinesium but similar at Shars show 600-1200 sfpm or something crazy.
 

chiroone

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#14
I was planning on doing a review on the 835. I have a DRO on order from precision Matthews. Unfortunately, my garage is filled with a lot of stuff I had in storage from my recent move. Might be a few weeks before I have everything cleared out and not yet had the opportunity to run the face mill as yet
 

MarkM

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#15
Any thoughts on the mill? Ready to purchase a mill. One on my radar. Looks great! How are the castings if you haven t run it. Not worried about the head.
 

chiroone

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#16
The castings in the base are slightly above average for a Chinese machine. It has its share of Bondo to hide some of the casting imperfections. However, I would say the table ways and dovetails are tight and well machined. I will also say that the one pump oiling system is a humongous plus. I was able to maintain about .001 On the entire x axis travel. I was speaking to Matt a few days ago about the installation of a DRO I purchased from him and he commented to me he only has one more 835 left. Another shipment is not expected till September. So if you were on the fence, I would act quickly .
 

MarkM

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#17
Chiroone you say you held .001 across the entire x axis. Is this the best you could achieve after tramming the head? Ready to purchase a mill but will be patient and sure it s what I want. Thanks for the reply.
 
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