On 02/18/2020 08:45 PM, John Dammeyer wrote:
I've got Mecsoft AlibreCAM generating the tool paths for this in the attached photo.
It's Cold Rolled steel 3/16" thick. I'm using a 1/4" HSS end mill. I'm trying
to figure out, using Machinists tool box, exactly what feeds and speeds could be used for
milling the slot.
I was thinking 30 SFM and with a 4 flute end mill doing 0.003" per flute the toolbox comes out with 460RPM, 5.5ipm for S460 and F5.5 and 10% of tool diameter for depth per pass so 0.025"
Is that too conservative or likely to break something? Doing it manually I'd do it by feel but once it's automatic it's harder to decide SFM and chip load.
Those numbers sound mostly OK to me. But, I LONG AGO gave
up plain HSS, the tool life was just awful.
I learned on a box of P&W Stellite tools and got spoiled.
When I finally wore them out, I started using
M42 and M57 cutters, which have at least 3X the tool life.
I'm showing 60-80 SFPM so that would be more
like 900-1000 RPM, but coolant would be required. And, I
usually plunge about 1/2 the cutter diameter
per pass. It all depends on the stiffness of your machine
how much of a cut it can handle.
Jon
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