Milling – Speed and depth advice

Milling – Speed and depth advice

This topic has 6 replies, 5 voices, and was last updated 18 November 2015 at 18:59 by Neil Wyatt.

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18 November 2015 at 13:45 #213020
Nick_G
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@nick_g
.

Hi guy's.

I have to mill out a piece from EN3.

I have a 3 fluted 6mm slot drill. (there is a reason it's 6mm) This is a carbide one so I realise it will be more brittle than a HSS one so will snap if I get too enthusiastic. It's a new one so will be sharp.

Question is what sort of depth cut would be reasonable to take on each pass and aprox speed for such a cutter into EN3

Cheers, Nick
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18 November 2015 at 13:45 #15813
Nick_G
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@nick_g
18 November 2015 at 14:28 #213025
David Clark 13
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@davidclark13
A lot will depend on the coolant available. Also if cutting a keyway it should be done in one pass. Speed about 3000 if available should be fine with lots of coolant. Probably about 25mm per minute feed.
18 November 2015 at 14:52 #213029
Ajohnw
Participant
@ajohnw51620
With HSS I reckon on a max depth of cut of around the diameter of the cutter. Can't see why carbide should be any different really but have never used slot mills of that type.

Speed can be similar to what would be used in a lathe with the same type of tool and material being cut except its the tool that is rotating. Generally I run slower than suggested figures as I like my tool to stay sharp.

Feed in my case is by hand so I haven't a clue what it is in mm / min. I generally adjust that to get a decent finish and by looking at how it cuts. If a cutter is taking what for it is a deep cut it will bend somewhat on smaller sizes. Too much of that will spoil the finish. Much of that sort of thing depends on just how powerful a miller is.

John

–
18 November 2015 at 15:28 #213037
KWIL
Participant
@kwil
1mm deep, 3000rpm dry, any deeper with coolant or air to remove the swarf.
18 November 2015 at 18:53 #213074
Nick_G
Participant
@nick_g
.

Cheers guy's

Nick
18 November 2015 at 18:59 #213076
Neil Wyatt
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@neilwyatt
I saw several similar sized keyways cut in one pass on a big 'bridgeport' yesterday, in stainless (I think)

The benefits of big solid machine were very obvious

Neil
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