Acetal Homopolymer (aka: Delrin)

Discussion on what materials you laser cut or engrave
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Joshua Vasquez
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Joined: Wed Nov 23, 2016 6:24 pm
Location: Sunnyvale, CA, United States
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Acetal Homopolymer (aka: Delrin)

Post by Joshua Vasquez » Thu Nov 24, 2016 10:13 pm

Hey folks,

I few years ago I discovered Acetal Homopolymer (aka: Delrin and PMMA), and have committed to it as my go-to material.

First off, it's relatively cheap, as in $9 for an eighth-inch (3.175mm) plate from OnlineMetals.com.
https://www.onlinemetals.com/merchant.c ... &top_cat=0

Next, it lases about as well as Acrylic in that the material undergoes a strict phase change when being hit by the laser. The benefit for us is that there are no char marks to worry about, just a buttery-smooth surface finish.

Finally, it's far less brittle than acrylic and a far better approximation of a contiuum than wood that it's become my go-to material for functional prototypes (mini robot drivetrains!)

Yes, there are some drawbacks (for one, it doesn't glue to anything), but with some foresight most of these issues can be circumvented with some classic engineering techniques. To get you started working with Delrin, I wrote a few articles over the last year.

http://hackaday.com/2015/09/03/how-to-b ... er-cutter/
http://hackaday.com/2015/09/22/drawback ... ound-them/
http://hackaday.com/2016/08/04/how-to-b ... -part-iii/

Cheers!
(PS: I am in no way affiliated with DuPont)
Homebrew 60-watt laser cutter built from VSlot extrusions, LightObject components, and controlled with LinuxCNC; 450mm (Y) x 600 (X); Laser Homes to BL

Joshua Vasquez

Don Chatwin
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Joined: Sat Aug 13, 2016 12:06 am
Location: Maple Ridge, BC
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Re: Acetal Homopolymer (aka: Delrin)

Post by Don Chatwin » Sat Nov 26, 2016 11:40 pm

Thanks for the info Joshua, going to have to pick some Acetal to test it out. The heat set inserts were especially interesting I never thought of that, so may possibilities.


Don
Don
Redsail X700 60W
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Dustin Hawkinson
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Joined: Sat Nov 19, 2016 6:55 pm
Location: Phoenix, AZ USA

Re: Acetal Homopolymer (aka: Delrin)

Post by Dustin Hawkinson » Thu Dec 01, 2016 2:02 am

Nice find. I added it to the master list.
40W (ebay 50W blue wonder), 300mm x 500m, TL
Windows10 RDW 8.01.19
(The member formerly known as astral)
-Dustin

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