Cutting acrylic

What to think of cutting acrylic
bits, speed etc…

I’ve used a single-flute 1/8" bit at 20ipm and 19000rpm.

On cast (not extruded) I go 100 in/min feed 0.02 in depth pass and 1 setting on dewalt for 1/8 bit.
This has been my go-to 1/8 for any material under 0.5 inch:

I’m quite sure I could go much faster but I don’t want to loose expensive materials experimenting.


I used this setup for this piece:

1/4" thick cast acrylic, 1/16" 2 flute upcut, 0.010 DOC, 75 IPM, Dewalt setting 2


½" V Bit and 6.29mm spiral up cut endmill, 3mm DOC, 20mm per sec feed rate, Dewalt speed “3” for V Bit and “4-5” for the end mill.

Cutting 5mm acrylic to make straight edge ‘rulers’ for work. I use a wood plane to put the bevel on the front edge (used to VCarve it, but the plane is faster), each needs 30secs with a file to remove the tabs and 2 mins with some 1200 wet & dry paper and they’re good to go.

Bottom two finished. To two straight off the machine…


I´m about to cut 1/2" (12mm) acrylic
That´s way I asked.
Anymore hints when you cutting that thick ?

I know some folk have also directed a stream of air into the cut to assist with clearing the dwarf (chips) and cooling the bit. I tried it, but ended up with a massive mess…
Possibly worth a few practice runs to tweak things before committing to your job.

@PhilJohnson, I agree that that’s more than enough; although sometimes even that is too much - did I mention how much I hate plastic swarf all over my work area?

I did however read in a couple of forum threads where people were using a jet of compressed air to keep the cut clear and the bit cool.

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