[troyerscnc]

I am wandering wat kind of bit u'll use to cut treated plywood and how much shorter tool life u can expect?

[zool]

Explain "treated" please.

There are many kinds of "treated"...

Many smart people here, but few mind readers...

[troyerscnc]

not sure. it is T1-11 pressure treated siding that i would be cutting.

[keebler303]

I don't know about plywood but I've routed tons of treated 2x material and it is pretty similar to non-treated. It is wetter so it tends to tear and fuzz a little more than dry stuff but it's not too bad.

[zool]

For a discussion on router bits take a look at this:

cucfablab.org/sites/cucfablab.org/files/onsrud_routing_guide.pdf‎

When cutting T-111, make sure your dust collection is up functioning very very well, it is miserable stuff to cut. Also high-quality respiration protection [not the 99-cent masks held on with a rubber bad!].

Here is info on wood preservative treatments, you might want to read to see what kind of chemicals you are dealing with. https://en.wikipedia.org/wiki/Pressure_treated_lumber