My Momus build

[TeslaFreakshow]

So I finally found my back to this forum after messing with my machine quite a bit.
I've managed to go through my first bit and I was wondering if anyone knew what type of bit is best for plywood? The good type of plywood not the crappy kind. I was using a .250 down spiral two flute bit from Home Depot and it was so dull the last time I used it, it overheated and some of the sawdust caught fire. I'm wondering if carbide would be better or maybe 3 or 4 flute bits? Though id ask before I experimented. Also when I cut the wood at 30IPM at a depth of about .250-.360" the noise was unbearable. I would usually make 2 or 3 passes to cut a depth of .725 total. Not exactly sure WTF I'm doing.

-Tom

[fastpcuser]

I think you're feed rate is low ... you should be able to cut faster. I have seen some people cut at 200 ipm ( plywood). usually stay within 70 -100

[TeslaFreakshow]

I'm using the hard plywood, sanded type. Rate is slow yes but is too slow a problem? Ill try it faster once i get a new bit. 30 was just the random rate I decided to start at. Also are you taking into consideration what machine I'm using? I'm using the rigid 2401 router.

[fastpcuser]

if you look at the video of momus CNC on youtube it he's cutting wood at 200ipm 1/4" deep. Cutting wood or plywood shouldn't too different. but I would try better bit and higher feedrate. Try around 50-60 ipm or higher you have to experiment a little but if you go too slow the wood will burn.

[TeslaFreakshow]

if you look at the video of momus CNC on youtube it he's cutting wood at 200ipm 1/4" deep. Cutting wood or plywood shouldn't too different. but I would try better bit and higher feedrate. Try around 50-60 ipm or higher you have to experiment a little but if you go too slow the wood will burn.

I just watched the vid you were referring too. 200IPM on pine 1/4 shouldn't be a problem at all. The stuff I was cutting was much harder than that. Ill post a pic tonight when I get home. I honestly haven't even tried anything faster so I'm not even sure there is a problem. I had already cut a bunch of stuff before i started burning wood. My machine hasn't racked or chattered or anything. I have yet to try it on aluminum.

[SpeedyDad]

I did a quick Google search. Take a look at this page and see if it helps:

Calculating Feeds and Speeds - CNC Router Shop

It is in metrics but you can convert

Also look at this thread here:

Feeds, speeds, and bits for plywood