I've never run plastic through a planer but I can see what is happening. It's called snipe. You have an infeed roller and an outfeed roller in the planer. When the plastic is under both there isn't a problem but when it leaves the infeed roller the plastic raises up a little, just enough to chew it up. It does it on wood too but not as noticeable. What you would need to do is raise up the end of the plastic that has come through the planer so it stays flat on the table. This can happen on the infeed too. The material needs to be flat on the planer table all the way though. You may also have bottom rollers on the planer that may be too high and holds the material up off the table. The bottom rollers are suppose to be almost flat with the table. Just raised maybe a thousandth of an inch. It's there just to keep the feed rollers from bending the material downwards.
If you are going to be doing a lot of this I would suggest using a timesaver sander. I know they are expensive but would give you a lot less problems.
Hi Steve, thanks for the comments.
I don't have any snipe on the trailing edge, it's super smooth. The problem is it gets chewed/chipped/sniped only at the leading edge. I tried giving the rollers more pressure and less pressure, it seems to not affect the outcome at all, pther than some scuff marks from the rollers themselves on the boards when I increase the pressure.
I'm sorting out the chain drive now, since I can't route it how it normally was anymore when I added the support bar I made. Hopefully I can mitigate this snipe issue with that piece.
I also don't have roller on the table, it's all steel, so that's not where my problem lays.
And about the sander, I can't use it because the plastic melts and it clogs the sanding drums unfortunately.
Thanks again for the comments and help!
the work pc is thin enough it is being 'bowed' by the pressure of the feed rollers.
it's plastic, it bends.
super ultra light cuts might help - but that's going to be more time = < $$ for the service.
given the cost of 'plastic cutting boards' - this could be a lose-lose-lose endeavor - especially if there's shipping involved.
you could also try a sled - the side/back rails will be sacrificial and required 'new' thickness rails for every piece....
Hi Tom, thanks for the comments.
The customers will be giving me bowed and deformed boards every day, so I kind of need the rollers to put pressure on the piece to make it flat for planing but I do see that if I put too much pressure they could bow up and cause my gnarly snipe problem.
I've tried doing super light cuts and it becomes an endless job on that single board, also my regular cuts are less than 10 thou already.
Regarding the cost, I've set my pricing at around half the cost of a new board, so it's encouraging for customers to resurface their boards, when physically possible.
And the sacrificial sled/pieces would not be cost effective nor healthy for the inserts on the cutting head, as the super aggressive snipe would still occur and I highly doubt that's any good lol.
Thanks for the comments!