17-4 H1025 speeds & feeds

[So not a Guru]

Anyone have recommendations for this? We have 1/2" 7 flute coated carbide, I'm thinking of trying 250 sfm .002" ipt 1"axial & .06" radial.

[Guest]

12 minutes ago, So not a Guru said:

Anyone have recommendations for this? We have 1/2" 7 flute coated carbide, I'm thinking of trying 250 sfm .002" ipt 1"axial & .06" radial.

Do you have coolant?

I used to cut it dry on the lathe I would do 75 -125 SFM, with coolant you can do more.

[So not a Guru]

7 minutes ago, Thee Byte™ said:

Do you have coolant?

I used to cut it dry on the lathe I would do 75 -125 SFM, with coolant you can do more.

Yes, the tool has thru the spindle as well.

[Colin Gilchrist]

I'm running that material on a Yasda, at 200 m/min (575 SFM), using Dynamic Milling techniques. Don't go "too slow", or you risk work-hardening the material.

300-400 SFM would be really safe.

I'd recommend starting with:

315 SFM - 2400 RPM

65 IPM - 0.0039 FPT (@ 8% RDOC)

1.0" ADOC

0.04 RDOC

[So not a Guru]

17 minutes ago, Colin Gilchrist said:

I'm running that material on a Yasda, at 200 m/min (575 SFM), using Dynamic Milling techniques. Don't go "too slow", or you risk work-hardening the material.

300-400 SFM would be really safe.

I'd recommend starting with:

315 SFM - 2400 RPM

65 IPM - 0.0039 FPT (@ 8% RDOC)

1.0" ADOC

0.04 RDOC

These numbers are with coolant, correct?

[Guest]

16 minutes ago, So not a Guru said:

These numbers are with coolant, correct?

Definetly with coolant, you may or may not want to use a different SFM on entry if you need to do a helical/ramp entry.

A good strategy I've heard echoed here is to ramp in with an old bullnose then come in with the new tool for trochoidal roughing.

[crazy^millman]

47 minutes ago, So not a Guru said:

These numbers are with coolant, correct?

TSC (Through Spindle Coolant) 1000 PSI if you got it. I have seen 30% increase in tool life on the same program just with this.

[So not a Guru]

1 minute ago, crazy^millman said:

TSC (Through Spindle Coolant) 1000 PSI if you got it. I have seen 30% increase in tool life on the same program just with this.

We do & that is my intention.

[Colin Gilchrist]

3 hours ago, So not a Guru said:

These numbers are with coolant, correct?

Yes, with flood coolant. Thru-tool is better, so you could easily do 400 SFM and 0.0045 per tooth. These are roughing numbers of course. 

[Matthew Hajicek - Singularity]

10 hours ago, So not a Guru said:

Anyone have recommendations for this? We have 1/2" 7 flute coated carbide, I'm thinking of trying 250 sfm .002" ipt 1"axial & .06" radial.

What brand cutter, and what's the flute length and stickout?  I've been using Helical, and the parameters from their Machining Advisor are spot on.

Checking for a Helical 7 flute 1.0" LOC variable pitch, 1.25" stickout in a shrink fit holder:

It recommends .035" stepover, 4160RPM (545SFM), 91IPM.  MRR 3.175.

 

[TheePres]

Imco website has a nice feature,  I believe it's called "Use this tool" . It defines parameters for different operations,  HSM, traditional roughing, finishing, ramp entry hole etc. I use 80% of these recommendations and have been getting excellent tool life on 17-4 and 13-8.