What rpm for a 60mm face mill and slitting saws?

[John CoatesParticipant @johncoates48577]

Hi all

 

Got myself a 60mm Sandvik Coromant indexable face mill from ebay but am not sure what rpm to run it at in my mill

 

Same issue with slitting saws – what speed should I run them at? After almost blunting one after it got very hot I need to know how to avoid this in the future!

 

regards John

[John CoatesParticipant @johncoates48577]

[Chris TriceParticipant @christrice43267]

Depends what material you’re cutting.

 

Speeds for HSS tooling at 60mm:

 

Steel & Cast Iron 70rpm

Brass/ Bronze/Free Cutting Steel 160 rpm

Aluminium 240 rpm.

 

Insert tools you can generally run faster.

 

Edited By Chris Trice on 16/08/2011 23:50:32

[Peter TuckerParticipant @petertucker86088]

Hi John,

High speed steel slitting saws can get hot quickly, with the exception of cast iron I would always run them wet. Flood with wetable oil for steel, and a continuous spray of kerosene for aluminium and copper alloys.

As for speed high speed steel cutting mild steel should have a tooth speed of no more than 100 feet per minute, harder steels and cast iron perhaps half that speed, copper alloys probably a little faster than 100 fpm., and aluminium perhaps 200 fpm.

If as I suspect your face mill has tungsten carbide cutters, then they will probably “like” to be run a lot faster (perhaps up to 10 times faster ), and you may not notice any difference between running them wet and dry.

Good luck, and happy milling.

Peter.

[Ian S CParticipant @iansc]

John, I’v got Arnold Thorp’s book “Vertical Milling in the Home Workshop” . For a 2 1/2″ HSS slitting saw; Mild steel 55rpm

Brass 95rpm

light alloy 155rpm

these speedsare lower than you’ll find in a lot of places, but are suggested for long life of tools. for cast iron , and harder steels you want slower speed, or smaller saw.

    As far as the face cutter goes I’ll tell you what I was told by an “expert”told me when I bought mine—“Just give it about 2 mm depth of cut, 900rpm, and crank like hell”, well I halve both those figures, and don’t crank quite that fast, it works OK for me, actually I think the usual speed I use is 520 rpm.   Ian S C

Edited By Ian S C on 17/08/2011 14:25:19

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