I've been cutting plex (cast 3/8") for about six months now. Edqe quality hasn't been perfect, but good enough to please my client. I use a 0 flute Onsrud 1/4" cutter (63-726) running about 23K on my PC890 router at about 90ips.
Recently, I took a break from the plex to cut about 10 sheets of MDF basically into strips, so quite a few feet in cuts.
Went back to cutting plex and my edge quality dropped considerably. Now, instead of pretty clean verticle shear cuts, I have angled cuts with a lot of very small tear outs. If you have the patience, check the URL, I didn't think there would be enough quality to really see the picture with the limitations on posting photos here.
www.cncworks.biz/images/plex.jpg
I've changed routers, used a new bit, cleaned and lubed my ways and rack and pinion. Wiggled, pushed and prodded all to no avail.
I'm posting here in hopes that someone will have experienced this and point me in a good direction to get back to where I was.
Thanks up front for any considerations.
Donn