Bits for acrylic

Discussion about Tooling and Fixtures. End Mills, Router Bits, Hold Downs, Fixtures, Etc.
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orangezero
Posts: 76
Joined: Sun May 12, 2013 8:35 pm

Bits for acrylic

Post by orangezero » Fri Jul 25, 2014 4:59 pm

I just thought I'd ask on here to get some clarification before placing an order. I already have a small router bit set, so I have a v-groove and 1/4in straight 2 flute cutters. I also have quite a few spiral drill bits. I'm looking for something that will make cuts through 1/4in thick acrylic and perhaps polycarbonate. I've heard single flute are the way to go.

http://www.ebay.com/itm/1-60mm-0630-sin ... 2334bc7ba3

or

http://www.ebay.com/itm/1-8-1250-single ... 3011&rt=nc

Do these seem appropriate for cutting acrylic? Would thinner ones be too easy to break? People seem generally happy with the stuff from drillman1, but there isn't much out there from my searches. Is there anything else there worth picking up (and save on shipping)?

Thanks,

Schruminator
Posts: 259
Joined: Wed Oct 30, 2013 1:04 pm
Location: Littleton, CO
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Re: Bits for acrylic

Post by Schruminator » Fri Jul 25, 2014 5:53 pm

I actually have both of those bits purchased from the same seller. With my set up they cut plastic very well. I've only cut HDPE and whatever the plastic name plates are made out of here at work, but no issues-- just keep your RPM's down to keep from melting the plastic.

Speaking of which, I've tried 2 or 3 different 2-flute v-bits on plastic and they failed miserably. About 3 inches into the first pass and there was gummed up plastic all over the endmill.

Regardless, I probably wouldn't bother with anything but single-flute endmills for plastics. If those bits you linked to fit the specs you need (length of cut, shank diameter, etc), then they should work just fine.
1.8m x 1.0m SO2 #3638 / Vectric Aspire / ACME Z-axis / View my photography at http://www.mschrum.com

orangezero
Posts: 76
Joined: Sun May 12, 2013 8:35 pm

Re: Bits for acrylic

Post by orangezero » Fri Jul 25, 2014 6:11 pm

Thanks for the quick reply and info. I was maybe going to try some mild etching with a v-groove bit on plastic tonight, but realize I'd need to keep it rather shallow. I've worked with, and gummed up, enough acrylic over the years to completely agree with everyone that uses single flute, even if I haven't tried it yet.

Schruminator
Posts: 259
Joined: Wed Oct 30, 2013 1:04 pm
Location: Littleton, CO
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Re: Bits for acrylic

Post by Schruminator » Fri Jul 25, 2014 6:16 pm

If you get the v-bit to work for shallow etching, let me know and I'll have to steal your settings and give it a shot. I had my v-bits at the lowest RPM's I could go (I think that's about 12,000 for the DW611) and did what I considered shallow passes (I forget the depth), but no success with my 2-flute 30, 60 or 90 degree endmills. I did not play with feed speeds at all, and while I don't think it would have made a huge difference in this case, I could be mistaken.

Good luck with things and keep us posted!
1.8m x 1.0m SO2 #3638 / Vectric Aspire / ACME Z-axis / View my photography at http://www.mschrum.com

ralston4
Posts: 49
Joined: Wed Dec 04, 2013 2:30 am

Re: Bits for acrylic

Post by ralston4 » Fri Jul 25, 2014 10:28 pm

Invetables has cast acrylic sheets that work well for routing. The cast acrylic doesn't melt like the extruded plexiglass. I have cut it with a three flute 1/8" endmill and it works great. There's a lot of factors that go into how hot the material gets.

Auarhau
Posts: 243
Joined: Tue Feb 25, 2014 8:46 pm

Re: Bits for acrylic

Post by Auarhau » Fri Jul 25, 2014 10:45 pm

I think those will work.

I've used https://www.inventables.com/technologie ... ll-10-pack sucsessfully on extruded acrylic. If you can get cast acrylic that is supposed to be much easier.

later I tried http://www.sorotec.de/shop/product_info ... mm-z1.html which is a huge improvement. Also look at http://www.sorotec.de/shop/index.php/ca ... ACRYL.html

Feeds and speeds for acrylics here http://www.shapeoko.com/wiki/index.php/Materials
ShapeOko 2. Nema 17 74 oz·in. GAUPS shield on Arduino Uno. DRV8825 Drivers x4 . Kress 1050 FME-1. Z Acme Screw. Threaded inserts table.

ralston4
Posts: 49
Joined: Wed Dec 04, 2013 2:30 am

Re: Bits for acrylic

Post by ralston4 » Sat Jul 26, 2014 4:46 am

Drillman has lots of good bits on ebay: http://www.ebay.com/sch/Home-Garden-/11 ... an1&_sac=1

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