Hard Milling Advice?

[Josh T™]

Hey guys,

 

We've got some slots to mill - .377 to .379 wide / .125 deep / A2 @ 60-62Rc / Approximately 6" long. I tried a 6 flute .3125 Endmill but no luck. I have some TiAlN coated 1/4 3 fluters with a .020 radius that I'd like to try but I don't have a clue where to start on the Feeds & Speeds.

 

Any ideas?

 

Thanks in advance!

Josh

[Guest CNC Apps Guy 1]

I like CBN in stuff above Rc 55. Tends to wear better than carbides do (even coated). You gotta have at least 12k on the spindle though. Oh, and yeah, you'll be running max RPM and feeding about 30IPM.

 

HTH

[Plastmo]

solution for me was YG1 tools

[Hardmill]

Mail josh

 

 

PEACE

[Tim Simmermon]

Josh,

 

Try these SGS Power Carb

 

I first tried YG-1 and then I got a hold of these. They ran 5 times as fast (feed) and lasted twice as long as the YG-1. Along with the correct coating, you need a good grade of carbide.

[MotorCityMinion]

Throwing some darts here. Holder type, machine?

Save the pricey stuff for finishing. Your going to cook some tooling. Start with used emills and put a .03 x 45. on them and use .025 DOC. Leave about .003 for finish, sides and bottom. Finish the bottom and sides with the radius-ed emill first, then follow up with a sharp cornered emill, staying off the sides and bottom some.

And a lil' bit of red won't mess things up. 10k to 12k likes the apps guy said. I'd go about .006 FPT for roughing in a heat shrink holder. See if you can grab some data from the OSG or Nachi sites for hard milling.

 

BTW, cool pic.

[Odin]

We use alot of the Power Carb e-mills. They work really well on hard materials.

[Odell]

We do alot of hard milling & OSG / SGS tools seem to work the best

[Quickmike]

Choke up on the cutter as much as possible.

[Josh T™]

Change of plans...

 

Our Jig Grind guys have nothing to do so we're passing the buck.

 

Thanks for the advice anyways fellas!

[MotorCityMinion]

Err...at least rough it for them.

[Josh T™]

it is it is.....

 

Chill out! I wouldn't do that to the Grind Guys... I used to be one!

[HevyMetl]

For future reference Jabro makes some excellent cutters for this kind of application. Their HPM product line would work great for this. They make the cutters down to 2mm and up to 16mm. You could pretty much 1 pass those slots for roughing and then leave a .005" all around for clean-up. If you want their contact infromation e-mail me at john(dot)joyce(at)tycoelectronics(dot)com.

[Josh T™]

Thanks John

 

We'll be in touch

[cunder]

Fraisa USA 1-800-427-7144

www.fraisausa.com

[Millertime]

I agree with heavy metal I use the sh-t out of jabro tools.Hey heavy metal have you used jabros high feed cutters (jhf980)those cutters are bad xxxx.

[HevyMetl]

I used them alot until I started using the HPM line of cutters. The speeds are actually slow when people think of HSS machining, but the chip load and MMR is huge.

 

8mm CUTTER(JHP 170 SERIES)

56-62 Rc TOOL STEEL

SLOTTING

1201 RPM

36.3 IPM

.157 DOC

FULL WIDTH

[Millertime]

I use those also they work great

 

jhp170

6mm

s-7 56-58rc

10ipm

2700 rpm

.150 doc

full slotting