- 19 Sep 2016
CNC engraver / cutting machine, has anybody tried cutting PVC foam board with something like the image below, they also make lasers for them but no idea what a laser would do too PVC board
You don't want to high-speed cut the likes of MDF either.. The glue is a known carcinogen.Found the answer to one bit (PVC) can in fact be cut with laser, the thermal process produces hydrochloric acid and toxic fumes. so I don't want a laser attachment
I think MDF gives off formaldehyde when machined, I believe some states in the USA are quite fussy about its machining.You don't want to high-speed cut the likes of MDF either.. The glue is a known carcinogen.
Any of these 'machines' should really be in a cabinet, with suitable dust/fume extraction and control..
Same here, that's cut at 1mm deep which is probably around what you get when you score this stuff with the screwdriver technique, think I will try going the other way next and speed up the traversing speed which is what the 20/s is 20mm horizontal travel / sec, just to see if the cut improves or gets worseTo my eye the 20/s one with a light sand looks pretty good, most certainly so from a normal viewing distance.
Might be telling you how to suck eggs but for perfect cuts on the face (IE a clean edge) you wont a down cutting bit with a high feed rate and low speed on the spindle to avoid melting, less passes the better but that might not be possible with a smaller machine.First tests done and I didn't spontaneous combust in a cloud of fine dust I bought the machine just to cut plastic and PVC board, no tree trunks as in the first pic, so it should have enough power to do that job. Clamping is easy with PVC foam board ,double sided tape , works perfect and is a pain to get the piece off the sacrificial bed I added so it ain't going to fly off in a hurry.
First test was a 1mm end mill set to cut 1mm wide slots it made a right mess of the job. The next three tests were done using a 20 deg engraving bit set at different speeds and getting 0.5mm deeper on each test. Results were better but still needs work to find the best bit and speed and depth to cut the PVC. I still have three weeks to test before I need to return it if it won't do the job , but looks promising so far for what I have in mind for it to do.
View attachment 257706
Hi I have control of the feed rate speed, the spindle speed, max is 9000 rpm, and the number of passes cutting depth per pass sets that, the best looking one so far on my tests was the 20mm / sec feed rate which was cut with two passes 0.5mm per pass. The next test was going to be a single pass, 1mm cut depth and then play with the feed rate speed and the spindle speed to see if I can improve the edge of the cut. I am sure with a bit more testing I should be able to get it to cut patterns for me cleanly.Might be telling you how to suck eggs but for perfect cuts on the face (IE a clean edge) you wont a down cutting bit with a high feed rate and low speed on the spindle to avoid melting, less passes the better but that might not be possible with a smaller machine.