Peel mill face?

[dfearnow]

I want to face a part using the peel mill method. Would I use peel mill, or another method. Im new to HSM, but now I want to use it on everything. My part is 4.75 x 7.00 and I need to remove 1.75 of material, 1018. Im using a 3/4 2flt carbide em. Thanks.

[cadcam]

My thought if you are facing the entire face of the plate you want to using the facing option and try the Dynamic facing option. peel mill is for slotting channels.

[dfearnow]

Correction, material is 4140. Just killed my endmill So i found a 5 flute 1" EM going to give a try. I used the peel mill 2 lines. Which is just a glorified contour pass with small passes. Im going to try 5700 rpm 70 ipm .750 doc.

[cadcam]

What SFM are you basing this one? that is way to fast. on the RPM. that is just under 1500 sfm for steall unless you are running a high end inserted tool that is going to burn up. also do you have a 4flt or 5 flt. I woulld start at 400 sfm and that is a little high.

[cadcam]

You know what never mind what I said you need to find the sweet spot.

[Matt@RFR]

If what you're trying to do is face the entire part off using HSM, then you need to use Dynamic Core with only one chain. That chain being the blank material you're starting with.

Be very careful though, once the cutter gets to the center, if you're running a proper HSM chipload, that small slice of material left is going to make a helluva bang as it gets ripped off the part.

[Shane123]

i would just side mill the face, less air being cut. save the peel milling for slotting. you can use the same speed/feed and your tool should last a little longer since you are not constantly entering into the part like you would be with trachoidal cutting like peel milling.

[txcncman]

Since I have not actually tired it, I would like to know if the "peel mill" tool path is actually faster than other tool path patterns, since it is touted as high speed machining. What is the actual advantage(s)? Faster material removal (not just faster feeds)? Longer tool life?

[dfearnow]

I ended up Just shell milling. Didnt have time to mess around with it. Back plot time looked about the same.

[Shane123]

Since I have not actually tired it, I would like to know if the "peel mill" tool path is actually faster than other tool path patterns, since it is touted as high speed machining. What is the actual advantage(s)? Faster material removal (not just faster feeds)? Longer tool life?

in slotting, its soooo much faster. you dont have to slow down for all that full diameter cutting pressure, you are doing a bunch of slicing and can really bump up the feeds and speeds. I had a 19 inch long part that was 3 inches wide and .75 thick. the slot went from one end to the other, 1.3125" wide, .5 deep. standard slotting times were taking 30 minutes if the tool held up, in stainless 304 plate. most of the time, the tool would give up on the 2nd part. i tried full diameter cutting with the stubby 1/2" endmill, full diameter cutting with a niagara fine tooth roughing endmill in 1 inch diameter, and a mitsubishi apx4000 indexable 1 inch endmill. none liked being in that full diameter slot cutting. i even had it bumped down to 40 minute times just to get tool life to last and it didnt help. thats when i tried peel milling with the stubby 1/2" endmill. i peel mill at .2" stepover, .2" radius entry and exit, at a 1" wide slot at 100 ipm, 9000rpm, .5" deep. Then i come back thru on each side and open it to size with side milling passes. I have it down to 3 minutes 30 seconds, and my tool lasted for the 40 part run we had. not bad for a 50 dollar endmill. heck, i could have burned up quite a few of em and still been ahead just by the time saved.

but yes, to directly answer your question, i think the best way to describe it is that instead of trying to hog so heavy, i switch over to light cuts and can speed up the feed & speed to minimize the amount of cutting time as well as tool pressure. the trick is to really stay in the cut as much as possible since rapid times will start to eat you up. like with peel milling, the back half of the trachoidal cut is air, so i minimize slot width to the minimum allowed to still allow my stepover and radius entry, since cutting side to side is less productive than making a long fast straight path down the sides in side milling. with my hurco vmx42, i found to leave my aircut passes feed to the same as my cutting feed and no microlift, since my controller doesn't handle it the best and i lose time. with a faster controller and faster machine, i could speed up my backfeed (aircuts) as much as i wanted.

i could draw you a couple mastercam examples up and you can run it thru the sim and see for yourself the time saved over normal slot cutting straight, as well as the time saved by keeping your peel milling as narrow as possible, but i am sure you can draw it up just as easily