Fadal VMC 15xt and 4140

[Kevinstj]

Good morning.. I am getting a job to run 1 or 2 pieces of 4140 on the Fadal VMC 15xt. I do not run this machine much. I know this machine does not like heavy cuts.
I designed the part in Fusion 360 and will be doing some adaptive cutting. I am looking to check my speeds and feeds.
Here is what I have programmed.

3D adaptive roughing
Lakeshore carbide 1/2" 4 Flute endmill (Square corner)
500SFM
3819 RPM
45.83 IPM
.003 FPT
.062 WOC
.543 Depth of cut


2D Contour
Lakeshore carbide 1/2" 4 flute (.060 corner radius)
1 1/4 " Sickout
500 SFM
3819 RPM
41.25 IPM
.0027 IPT
.020 WOC Finish

2D adaptive
Lakeshore carbide 3/16 4 Flute (square corner)
1 1/8 stickout
325 SFM
6620 RPM
19.86 IPM
.001 IPT
.035 Step over
.125 depth cut


Coolant or Air?

Thanks for any help

 

[D Nelson]

About .025 step over and 50 ipm and coolant you are stepping over a little hard for that machine hope it helps you out
Don


Sent from my iPhone using Tapatalk Pro

 

[Mtndew]

Maybe a little conservative on the sfpm and ipt but I'd say it's not bad.
If anything I'd change your stepover to 10% max.
Otherwise your speeds and feeds seem ok for that machine, maybe bump the feed up but that's about it.

Coolant is fine.

 

[Ianagos]

I’d say those numbers look good for a vmc15

Only thing is for tge finishing I’d slow it down a little and maybe take a shallower woc.

Another thing is use good holders like an endmill holder.

And I you may need to slow that 3/16 tool down some because it’s sticking pretty far out there

 

[Kevinstj]

Thanks for all of the help. Hopefully I can get back on this today or tomorrow and see what kind of destruction I can do.
I had a feeling the 3/16 was a little fast.

 

[Kevinstj]

I backed the 3/16 mill down and it came out pretty good. This is a one piece item and pretty happy with the result. I would post a pic, but its giving me a problem uploading.
Thanks for all the info and help.