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Author Topic: CNC and plexiglass  (Read 198 times)

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Offline Nemezis

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CNC and plexiglass
« on: November 15, 2020, 07:31:14 AM »
hello all.

Anybody knows what type of bits # of flute (coating?) and speeds are required to avoid clocking a 2mm bit when working with 5mm plexiglass?

Thanks
« Last Edit: November 15, 2020, 03:46:03 PM by Nemezis »

Offline Darth Chasm

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Re: CNC and plexiglass
« Reply #1 on: November 16, 2020, 07:25:24 PM »
Spiral 'O' single or 2 flute upward cut bits are what is recommended. I am not versed enough to give advice on feeds and speeds but most good tool makers provide decent info on that for each tool.

You want cast acrylic, not extruded. Extruded melts and cracks much easier.


Offline Nemezis

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Re: CNC and plexiglass
« Reply #2 on: November 17, 2020, 02:04:13 AM »
Thanks, I'll try it on Acrylic plates indeed.

Offline Nemezis

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Re: CNC and plexiglass
« Reply #3 on: November 17, 2020, 07:18:31 AM »
Acrylic was the way to go.
I had a small piece of 3,4mm left somewhere, did a test and it's clearly the way to go.
No more cloaking even on a 4 flutes bit @  6000RPM

Thanks a lot for the trick.

Offline Darth Chasm

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Re: CNC and plexiglass
« Reply #4 on: November 17, 2020, 04:25:35 PM »
I just recently got into cnc router work and mainly for acrylic so I’ve been doing some research. Glad I could share some of what I’ve found.

Offline Nemezis

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Re: CNC and plexiglass
« Reply #5 on: November 23, 2020, 01:09:16 PM »
Yeah, that was a valuable info for me. Saved me lot of  research and reading.
Thanks mate.

Some prototypes in Acrylic (and wood)




Offline Darth Chasm

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Re: CNC and plexiglass
« Reply #6 on: November 23, 2020, 04:30:34 PM »
Lookin good  :cool:

Online SirRawThunderMan

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Re: CNC and plexiglass
« Reply #7 on: November 23, 2020, 04:53:15 PM »
Nice.  :smiley:

I really want to try that out now, but the router I have access to normally is in storage and won't be out until 2021 at the earliest. oh well.
Better late than never.

Offline Nemezis

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Re: CNC and plexiglass
« Reply #8 on: November 23, 2020, 11:34:08 PM »
CNC are really nice for fast proto's.
Mine was initially built for wood but is pretty stable for small parts.. I still have some vibration though and I have to find out why.

What you guys are you using for CNC's? Own build or off the shelf?

Offline Darth Chasm

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Re: CNC and plexiglass
« Reply #9 on: November 24, 2020, 05:43:13 AM »
I got the sainsmart 4030 proverxl. Got three cuts from it, then one of the servos crapped out. They’re supposed to be sending a replacement.

Offline Nemezis

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Re: CNC and plexiglass
« Reply #10 on: November 24, 2020, 08:20:24 AM »
Woaw.. you burned a Nema23  :shocked:
4030 is a good size for our type of projects.. just strange you burned it after only 3 cuts..

Offline Darth Chasm

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Re: CNC and plexiglass
« Reply #11 on: November 24, 2020, 02:56:37 PM »
Not sure what happened. It just stopped moving. So i took it off and sure enough there were two points in the rotation that had a substantial amount of resistance and required quite a bit of hand torque to get past.

Offline Nemezis

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Re: CNC and plexiglass
« Reply #12 on: November 25, 2020, 05:41:25 AM »
unpowered and blocking, Yeah, it's definitely abnormal. Have you tried to open it up to see what might have caused this? (I'm sorry, bad habit I have, I can't help myself unmounting everything)