Finishing questions

[dbunyip]

Any tips on what I can do for a better finish. Trying to do a scallop and it cuts great one way but when it turns around it gets all these little hairs on it.

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[AUSTINMACHINING]

Could be from the coventional cutting direction or thats a flat part where its using the tip of the cutter (assuming ball mill), but i can't really see the slope of the part. Try cutting only in the climb direction.

[dbunyip]

Yes it is with a ball mill on a slight slope. Ended up just doing a parallel instead but would like to figure out the scallop. I tried one way cutting which fusion says is climb cut only but it seemed to me to cut both ways still but left funky linking moves in the pattern

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[SCzEngrgGroup]

Were you using coolant, or lubricant? Both can help a lot with that. But it's probably not realistic to expect it to come out perfect. You will almost certainly have to do a little clean up with some steel wool, a Scotchbrite pad, or some polish, no matter what you do.

Regards,
Ray L.

[jwatte]

To avoid the hairs, try feeding faster, or spinning slower.

Or cut with a face mill and then scrape scallops with a shaper :-)

[Steve Seebold]

What is your coolant delivery method? Are you using spray or flood coolant? If you’re using a Fog Buster, I’d day that’s your problem because the Fog Buster doesn’t have enough air pressure to blow chips away.

I would only use flood coolant for that application. I have a 2 nozzle Fog Buster and I only use it for profiling.

[dbunyip]

I'm using XTREME CUT 250C by flood at 7% concentration. I have an upgraded pump, 5/8in lines and 3 nozzles. I'll try again playing with the feeds. See what that does.

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[AUSTINMACHINING]

Yes it is with a ball mill on a slight slope. Ended up just doing a parallel instead but would like to figure out the scallop. I tried one way cutting which fusion says is climb cut only but it seemed to me to cut both ways still but left funky linking moves in the pattern

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Looks pretty flat, so probably using the center of the cutter where SFM is really low "dragging" the cutter. One way to increase SFM is to use a bull nose EM if the geometry will allow, or fixture the part at an angle so your not using the tip of the tool.

[dillonfitz]

Yes it is with a ball mill on a slight slope. Ended up just doing a parallel instead but would like to figure out the scallop. I tried one way cutting which fusion says is climb cut only but it seemed to me to cut both ways still but left funky linking moves in the pattern

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I see that when I get impatient and turn off the coolant for a second to take a look lol. But with that being said I bet it’s a lack of lube/chip recutting


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