Dust shoe top

[barry99705]

Not 3d printer related, much. I did print the dust shoe, but what I'm really happy with is the clear top plate! Cut it out on my cnc router and it actually fits!!

http://www.youtube.com/watch?v=KtqhBiFaDpQ


Looks like youtube embedding is still broken..

[Mac The Knife]

is the trochoidal cutting supposed to minimize burring?

[barry99705]

It helps with heat. I don't have speed control at the moment, so my router runs at full speed. There's no way I could cut plastic like that. So it cuts in small loops to give a bigger cut path for chip evacuation. It also lets you cut faster than just a straight cut.

[Mac The Knife]

I had figured it was about the heat, also allows you to cut at full depth. SheetCam, nor V-Carve offer that cutting solution.

[geneb]

V-Carve will allow you to cut at any depth you like...

g.

[Mac The Knife]

V-Carve will allow you to cut at any depth you like...

g.

And so will SheetCam, and Meshcam. I don't think they've included trochoidal cutting.

[barry99705]

Okay, don't use trochoidal cuts on plywood. At least not with my cnc.... Goes along okay on the straights, but when it gets to a curved part it really really, really, slows down. Think it's a memory thing, but not sure. Also, plywood will kill a carbide bit really fast!

[Mac The Knife]

What are you using for a controller? I assume its not a PC.

[barry99705]

The brain is an arduino with a ramps shield. Ryan designed it to be anything-ish you want it to be, so we use repetier to run it. You can stick a hot end on it and make really big prints(if they don't curl), or a small laser head to engrave/burn stuff.

This is still one of my favorite videos of this thing.
https://www.youtube.com/watch?v=qJfYTv88YvI

[geneb]

That's a very odd toolpath. (trochoidal) Then again, I can cut 1" plywood full depth at 12in/sec, so...

g.

[barry99705]

That's a very odd toolpath. (trochoidal) Then again, I can cut 1" plywood full depth at 12in/sec, so...

g.

Yea, but your router is quite a bit bigger than mine. And more expensive.

Oh hey. What end mill do you use for plywood?

[geneb]

I'm kind of partial to the Centurion Tools "O" flute mills. They cut baltic birch very nicely. If you've got tear-out problems, you can use a 2 flute compression cutter - it's half upshear and half down-shear.

Centurion Tools makes really great and affordable cutters for CNC routers. See here: https://www.centuriontools.com/router-b ... -bits.html

g.

[barry99705]

Sweet! Thanks dude. Not too worried about tear out, not making "pretty" parts yet, but I really need to get a speed controller for my router.

[geneb]

Even one of those little router speed control boxes you can find on Amazon would work in the short term. Long term, you REALLY need to get a spindle. Your cuts will be better and so will your hearing.

g.

[barry99705]

Yea, I stopped by Menards today and picked up a speed controller. I still have my hardshell ear defenders from working on jets, so I wear those when the router is going. Whenever the router is going, so is the shop vac, so it's quite loud in there.