cutter veering off circle

[bob_reda]

Just started doing this the past couple times. When cutting a circle, say 3/4" material. When the bit is getting toward max depth it suddenly veers off the circle and starts cutting into the material. I thought maybe I needed a new end mill, changed it out and it worked ok, then today did it again. I notice especially when cutting corian. Any ideas?

Bob

[Kyle Stapleton]

Need more info.

[robtown]

Need more info.

Agreed...
not sure how much “off circle” we’re talking here.

[bob_reda]

using a 1/4" em, either up or downcut, cuts straight across the wood. Like it catches a corner and goes haywire. Going 180ipm

Bob

[Brady Watson]

What happens if you run it at 90 IPM?

Use a piece of scrap. Extra points for pics or video...

Guessing this is a Standard and not Alpha.

-B

[bob_reda]

This is a prt with the RBK contol box and new motors. I will slow it down and hope that is it.

[Kyle Stapleton]

A downcut in corian is a bad idea, you should be using a "o" flute.

[robtown]

using a 1/4" em, either up or downcut, cuts straight across the wood. Like it catches a corner and goes haywire. Going 180ipm

Bob

the two descriptions you’ve provided are incongruent...
do you have a picture you can share?

[bob_reda]

I'll try and draw something to make it less confusing

[bob_reda]

Hope its understandable. It happened in both corian and in wood

Bob