Registered: 1444086789 Posts: 18
Reply with quote #1
Any advice on cutting the 1/4" polypropylene sheet would be appreciated. We have cut it with a jig saw in the past but are in need of more precision. We have a router and were wondering if it was safe or possible. We are willing to experiment, but have had bad experiences with cutting pvc and would rather not have a problem that could be avoided.
Thank you Danny
Registered: 1441986896 Posts: 32
Reply with quote #2
In the past, we have always cut it with a scroll or band saw. The speed of the blade is very important. If you cut too aggressively, it simply melts and then solidifies a bit behind the blade. I don't think I would want to cut pieces with a hand held router, much less let the kids, but if you used a template, watched your spindle speed and were not too aggressive... you MIGHT get decent results. Definitely not my first choice though.
I quickly found this article http://www.plasticsmag.com/routing.asp?fIssue=Mar/Apr-08&aid=4741 . It focuses on CNC, but does address a few pertinent issues. We are planning on experimenting with cutting it on a CNC router this year. Not to hijack your question, but it would be great if anyone has a few tips of their own tips for CNC with any of the plastics.... perhaps posted as a new thread to keep this one on topic
Registered: 1426398216 Posts: 67
Reply with quote #3
I would suggest a bandsaw.
There are some useful general tips on kit material in the BRI File Manager if you have not seen them before. MAIN / Public Resources & Training / Technical Training
Registered: 1447734057 Posts: 12
Reply with quote #4
In addition to speed, the size of the teeth on the blade is critical. Larger teeth are more effective at removing material from the work area, thus inhibiting the self-weld process.
I have never cut the polypropylene with a router, but I have cut it on a mill, and have found that large (3/8 +) 2-flute end mills, with a low spindle speed (600-1200rpm depending on end mill size) and a high feed-rate, work really well. I would imagine that the router would work well under the same conditions, as long as your cut pattern isn't too intricate.