Feed and speed to machine HSS

[zaebis]

I will have to mill off some part of HSS 1/2 x 1/2 square bar to make it fit for my needs by about 0.1-0.2" I plan on using 1" indexable facemill to do that. Any ballparks on reasonable feeds and sppeed and DOC for a small milling machine?

[John Welden]

Maybe around 800 RPM 5 to 10 ipm.

DOC, hard to say.

[beege]

Hardened? Surface Grinder!

[zaebis]

Originally Posted by beege Hardened? Surface Grinder!

no grinder. only mill is available.

[beege]

Is this a lathe bit? If it is, it's going to be VERY difficult to cut on a mill.

[Andre' B]

Get a 3/8 bull nose end mill with 0.06 rads, YG X-Power are resonably good and inexpensive.

Spin at about 250 to 350 SFM.
Feed at about 0.002 IPF.
Run dry with maybe just a little air blast to get rid of the chips.

Use it like a face mill taking about 0.005 deep cuts.

[Mcgyver]

Originally Posted by zaebis I will have to mill off some part of HSS 1/2 x 1/2 square bar to make it fit for my needs by about 0.1-0.2" I plan on using 1" indexable facemill to do that. Any ballparks on reasonable feeds and sppeed and DOC for a small milling machine?

you're talking about an annealed piece of hss? otherwise, sorry, not a chance. ceramics will do some hardened carbon steels but you're not going to touch hardened hss with anything but abrasives

[zaebis]

Originally Posted by beege Is this a lathe bit? If it is, it's going to be VERY difficult to cut on a mill.

it is a lathe bit yet. It is used as a parting tool. I need it thinner. Is that not a chance on a mill?

[zooloader]

Hi , I had to mill a 6mm af hex broach tool, down to 3mm, a couple of weeks ago.
I used an Iscar multi-master 4 flute endmill with 1mm corner rad, grade IC908 (I think).
speed was 10m/min
feed was 0.02mm/tooth
DoC was 0.2mm

This worked beautiful, but took a long time! I was fortunate to have a nice rigid machine. The cutter still looked new when finished, and I went on to use it on some aluminium parts.

good luck

[mbi]

I plunge out broken HSS taps all the time. I use old reground endmills. They work remarkably well. Say .5 dia endmill 100 cs .002 ipm.

[John Welden]

Originally Posted by Mcgyver you're talking about an annealed piece of hss? otherwise, sorry, not a chance. ceramics will do some hardened carbon steels but you're not going to touch hardened hss with anything but abrasives

I've milled it with carbide before.

And of course plunged taps out.