Am I cutting this correct?

[sebago_signworks]

I am cutting a. 75" sheet of ply at 14k rpms, 3 passes. I a, getting a very loud hi pitch noise. When I lift the z axis it does not happen so I know it is in the cut. I am a rookie to this, is this normal? I screwed the material down I. 12/15 places, so I dont think its vibration. What do you think?

[garyc]

Devin...
You dont give your move speed or bit type so it is hard to give proper advice. That said, the "squeal" is usually a result of too much rpm, too slow of cut speed, or both.

[sebago_signworks]

Ah, sorry. I am using a 4 flute at 1.00.

[garyc]

Devin...
I dont use 4 flute with wood as they wont generate enough chipload to stay cool. With a 2 flute 1/4" compression, which is made for cutting veneer plywood, I would cut at 2 passes @ 10.5-12K rpm, 4-5ips for an alpha, 3-4 with a standard.

EDIT: After reading Brady's post, I add: And it still may squeal!

[Brady Watson]

1/4" tools are notorious for 'screaming' noises...This is true even on some tools running the scientifically ideal chipload from the manufacturer.

-B

[sebago_signworks]

Would you recommend using a different size bit?
Btw... you guys are great... thanks for the help