A286 opinions

[mkd]

Flood Coolant or thru spindle air?

 

got a flight hardware piece on the mill turn, but not happy with inert life as edges are only lasting about 1 part or ~30min

running a high feed tungaloy 1.25" cutter.

.02 z depth 900rpm @20. ipm.

 

any opinions?

 

 

 

[civiceg]

I would try one and the other and see what you get. Insert material?

[mkd]

they are tungaloy  M-L AH725 i guess.

 

well the edges are breaking down after one little part so it couldn't get much worse.

 

the feed seems pretty slow when the box recommends .012-.028ipt for Stainless.

 

been about 15 years since I've cut the stuff and i wasn't great with it then. haha

[YoDoug®]

That feed seems really slow. I would expect a high feed cutter to be running 100+ ipm at that shallow of cut.

[jlw™]

I would run that around .03doc, .03ipt, .8woc with thru coolant

[jlw™]

Also, if the same spot is breaking it down check transitions. Our tung cutter say .8 degree ramp.

[civiceg]

+1 on the 2/3 WOC. Geometry allow you to arc in and out of the cut? 

[mkd]

ok bumping up the feed as i type.....

 

oooh i have a 2.0° helix....

 

leaving coolant on for the time being. i just remember trying to surface grind the stuff DRY and having it curl LIKE A MOTHER.

[mkd]

+1 on the 2/3 WOC. Geometry allow you to arc in and out of the cut? 

Using optirest to square up stock, then just some contours to face around bosses.

Opti basically just helixes over the part mostly on centerline. its a pretty small part.

[?Mark]

Peel mill, 1.25 deep, .02-.03radial and dry.

HMC, so chip evacuation was great.

Worked a lot better than feed mill.

[mkd]

Peel mill, 1.25 deep, .02-.03radial and dry.

HMC, so chip evacuation was great.

Worked a lot better than feed mill.

cant sidemill on outside due to 1" part on 8" chuck.

 

I am Peel milling in slot with .250 em. 2000rpm@23ipm with great coolant flow. doesn't sound too fast put that little cutter is zipping through the slot pretty good. But its getting dull pretty quick and leaving lots of excess material in clevis for finishing. Had to add a finish tool, which is also needing more and more spring passes to hit tolerance. maybe the coolant is murdering the edge on these?

[bd41612]

Kennametal KYS30 might work well here.  Used it on Inconel 718 went from 1 part per edge on a conventional cutter, to 6 parts per edge with the ceramic.  Cycle went from 11 minutes per part to under 2.

[mkd]

ended up doing some side milling on vert mill.

tried running air blast on .500" endmill. less than impressed with results. stuff is gummy and chips were re-welding themselves to part, especially on a conventional cut.

a little oil in the air stream made a huge difference.

[djstedman]

Best luck I have had with A286 is using fine tooth roughers running with coolant.. I guess it depends on the part geometry but using fine tooth roughers I was able to remove stock far faster and with much better tool life than any kind of highfeed or dynamic type paths using regular cutters. Never even crossed my mind to bother with inserts so not sure how they would work but tbh im not surprised at the 30 minutes tool life.. that's prob not too bad for inserts in A286 .. that stuff is pretty bad to cut.