13-8 Stainless, move after HT?

[SLJ]

We've got a couple of small parts, look similar to butt hinges, that are supposed to heat treat to 205 KSI(43-48 RC). Made out of 13-8 Stainless, the flange is .087 thick. We're being told we should machine to net, then HT. I don't have any experience in this area and figure someone here would know more about it. What's our chances of it holding shape?

Bought a bunch of Hanita Varimills to get started, the tool man says 150sfm and .0035ipt, wet. There will be a 1/4 ball nose doing some 3-d on the rolled bead, guessing we can speed that up a bit.

[travis meyer]

how big is the part

[?Mark]

Your numbers don't look right.

Sfm is way too low (try 250+) and cpt is too high...

What dia are you going to use? Also not sure about a shape and tolerances of your part, but I'd be concerned with deformation after ht...

 

hth

[SLJ]

Material is .75x2.5x3.7. The part looks something like a butt hinge, with the flange .087 thick, and the raised solid bead about 5/8 high, and on a radius.

[crazy^millman]

If doing 3d work keep the same direction on the ball em tool will last 10 to 20 times longer than if you climb and conventional cut with it. Yeah I know the code is going to be big and more rapids but what good is it if you got to change the endmill 1/3 way through the part.

 

HTH

[Slepydremr]

It's been a while since I've dealt w/ 13-8 but I thought it shrank in heat treat.

 

So.. I did a quick google and found this

 

HTH