I am making lots of new chairs this winter.

Main problem is this, when I run a board through my Delta table shaper I get black marks on my wood.

I have tried silicone spray to coat the metal surface, NO HELP, just makes it slick(which is good) but discoloration is still there.

ANY ideas in how to ELIMINATE this problem will be appreciated.

Ken

The blade isn't dull, is it? Or it may not be taking enough material?
I've seen a circular saw that the blade was too old. It wore through instead of cutting, and left black marks, like the wood was seared or burnt in swirls.
Let me know if any of this helps, Ken!

It isn't the blade causing the discoloration, it's the metal base which the wood rides on.

Ken

A shaper is a different animal. There is too much friction and not much cutting, so therefore the piece is being driven into the table instead of being cut. You could also be taking off too much material. I vote for bad cutters.

It isn't the blade causing the discoloration, its the metal base which the wood rides on.

Ken
Oh, the metal surface that the board rides on is leaving the marks! Instead of lubing with silicone, which could hold more contaminants, try cleaning it with a damp papertowel or a sponge and a dab of Bon-Ami powdered cleanser. I have used it for a sticky deck surface on a table saw, but not for discoloration. It may help? Good luck, Ken

Oh, the metal surface that the board rides on is leaving the marks! Instead of lubing with silicone, which could hold more contaminants, try cleaning it with a damp papertowel or a sponge and a dab of Bon-Ami powdered cleanser. I have used it for a sticky deck surface on a table saw, but not for discoloration. It may help? Good luck, Ken
Yes, I have tried cleansers, lacquer thinner, and steel wool, still the same effects.

I am using rough sawn materials which are not desirable to sand down, the blackened marks are from the deck and are most frustrating.

I am now considering a poly coat to the surface to eliminate the true contact between plate and wood altogether.

Ken

Well, you can try bondable teflon. PTFE Teflon Sheet (http://www.smallparts.com/products/descriptions/vt-vte.cfm)

I have used Johnson's paste wax before and it does a reasonably good job. Just a light coating works best.

Well, you can try bondable teflon. PTFE Teflon Sheet (http://www.smallparts.com/products/descriptions/vt-vte.cfm)
I ended up using vinyl sheeting(6 mil) and spray adhesive for tacking it to the table,this seems to be a good solution,thanks to your idea I came up with this one.

Ken