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Small milling cutters

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DavidA:
I'm used to using large industrial milling machines, but  when it comes to my small tabletop machine I am a bit wary.

What would the group suggest as a reasonable speed (rpm) to run a 10mm HSS two flute cutter when cutting bright mild steel ?

I believe this material to be to EN3 spec. Non leaded.

Dave.

philf:

--- Quote from: DavidA on January 23, 2016, 06:53:47 AM ---I'm used to using large industrial milling machines, but  when it comes to my small tabletop machine I am a bit wary.

What would the group suggest as a reasonable speed (rpm) to run a 10mm HSS two flute cutter when cutting bright mild steel ?

I believe this material to be to EN3 spec. Non leaded.

Dave.

--- End quote ---

Hi Dave,

According to FSWizard 1,640 rpm:

http://zero-divide.net/index.php?page=fswizard

Phil.

DavidA:
Phil,

Thanks for that, and the link.

I looks as if you used 'very soft steel' as an input.

I suspect this stuff is a bit tougher, so I tried 'structural steels <0.5% Carbon.

I believe it is C15, or there about.

Gives me an rpm of 1380.

I guess the best thing to do is call in the steel supplier and ask them for the spec.

All I'm making at the moment is 'T' slot nuts. The machine does appear to be making hard work of it. There again, it is only a Micro Mill.

Dave.

Pete W.:
I might be hallucinating but I seem to remember someone quoting a rule of thumb for rate of metal removal (e.g. cubic inches per minute) versus horsepower (or Watts) at the tool.  Maybe you're running out of horsepower? 

DavidA:
Pete,

A possibility, but in this case I doubt it.

I'm only cutting 3mm wide and 0.5 mm deep.

Having watched Stefan Gotteswinter's video where he does a comparison between HSS and Carbide cutters



 I don't think I should really have a problem.

Dave.

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