Cherry plywood machining advice needed

[steve_g]

What should I be listening for to find the "Sweet Spot".

The old adage is "feed a screaming bit" something experience will tell you.

If you were hand holding a router, the direction where the router wants to grab and run away from you... that's a climbing cut. very difficult and dangerous to do with out a CNC to control the feed rate.

Steve

[archis]

Is the climbing cut an option I set in Partworks when I generate the toolpath?

[dlcw]

Jim,

I've attached a zip file that will explain it with pictures.

[bleeth]

Jim: It's time for you to look over the tutorials and videos available on the software and your machine.
After you look them over do it again more slowly and take notes on anything you didn't understand so you can go over that section again.
When hit with an expression like "compression bit" if you don't know it, google it. Lot's of info out there for a minimum of research on your part!

I'll disagree with one comment made:
"To realize this benefit however it is necessary for you to cut full depth in a single pass."
You do have to ensure that your first pass is deeper than the upcut portion of the bit. So if you have a mortise compression bit with a .19 upcut length then you need to go deeper than that on first pass. 1/4" is safe all around.

[bruce_taylor]

I have used onsrud 60-123 and 60-121 3/8 inch with good results at 11,000 rpm and 2.5 ips 3 passes. May be a little conservative but I get a nice clean cut. Just my two cents (worth about a penny these days). Good luck!

[steve_g]

Excellent document! Did you create it Don?

Steve

[archis]

Thanks everyone, I get it now. I'll get a compression bit and start experimenting.

[steve_g]

Is the climbing cut an option I set in Partworks when I generate the toolpath?

Yes, The image shows the option in PartWorks.

Steve