304SS speeds & Feeds

[Bob W.]

What would be a good speed and feed to start at for 304SS and the following cutters:

 

1/4" 3 flute end mill solid carbide

3/32" 4 flute end mill solid carbide

 

I am new to CNC machining so I appreciate any input.

 

Thanks,

Bob

[?Mark]

Now that's a fairly open question.

There is different carbides, geometries of a cutter and coatings galore, but

for a good tool like varimill or stabilizer I'd start with 250sfm+ and about .001" ipt for 1/4 and .0003" for 3/32

For profiling I'd kick a chipload up a quite a bit

 

hth

 

Mark

[Guest]

1/4" 3Fl. Carbide

1/4" RPM of 3800

11.5 IPM

DOC .07/.05

Step over 35%/55% of cutter

 

3/32" 4Fl. Carbide

3/32, MAX up around 10K

9. IPM @ 10k

DOC .05/.03

Step over 25%/40% of cutter

 

You can use Machinery's Handbook for very good ballpark starting #'s

 

RPM = SFM x 3.82/Ø cutter

Feed = CPT x No. of Flutes x RPM

 

HTH

[Dan Schnars]

BWolcott... When I was getting started I bought a set of the Machining Data Handbooks from the Institute of Advanced Manufacturing Sciences... They work pretty decent to get you in the ballpark... Then from there its up to what you are using and rigidity, etc... Hope that helps you...

[Code_Breaker]

I use the same books as Dan . . . fabulous