G’day and welcome to the forum.

 

Welcome to the forum.

 

I actually did something recently like this.
Same 1/4" (.22") thickness and same size slots
Make sure you do the slots first & w/ a 3/32" bit or piggly wigglies happen
A straight open line cut can take on the bevel/chamfer, just set the proper depth

Also helps to screw in scrap to hold down the Poly from moving when its time to cut out.
Polycarb (PC) can &/or will lift if not fastened down good. Chips like to go under.
I onion skinned down to .19" w/ a 1/4" bit then cut out w/ a 3/32".
Plan a 'what if I' strategy to foresee what could go wrong.
Things will change as you get a feel for cutting PC more & more
Test cut on scrap before you dive in.

I don't like PC, to me it will always be nasty

* The bottom slot looks off center, that side is narrower and could cause problems.
Use Bridges or as they call them tabs to help hold.
Ramp in all cuts. Climb cut
In a nutshell... others to follow

 

Thanks for the replys!
I think i've got a good idea of what i need to do now.
Going to grab a few new bits and run a bunch of tests on scrap before cutting the full template.

 

New sharp carbide bits are a must. Polycarbonate needs new sharp bits. Speed about 15,000 rpm any faster you can create problems. Use old bits on some 1/4 inch hard board. Helpful to correct flaws in the coding. Adjust and repeat till you achieve the results your looking for, then apply that to the project piece. Hope that helps.

 

I have worked with PC quite a bit here lately and I do like it, the current bits I am using are are Single Flute Endmill and Two-Flute Low Helix in various sizes. Through a good deal of trial and error I found these to be the best suited for finished products, from a relief carvings to a full sized job box. The main thing I learned is to be mindful of the heat being generated and that the material is very unforgiving, you mess something up it is near impossible to fix it. So planning is key to successful finished products. Fortunately I found a seller on Ebay that I can get 1/2" PC from super cheap so it allowed be to experiment and learn a good deal. I am sure that a lot of folks would disagree with me but I have been very satisfied with my end results. Polycarbonate Sheets Panels | eBay

 

Welcome to the forum, @c.danturner

 

Welcome to the forum @c.danturner

 

@c.danturner Disagree? bah humbug... also, if theres a sign shop around town, stop in to see if they may be able
to let go of some PC. hah... I got loads of good scrap pieces. Offcuts can build up after a while.