On Jan 1, 9:51*am, William Bagwell
wrote:
Need shallow grooves in wood, *lots* of shallow grooves in lots of wood. At
least 48 in each side of dozens of 16 X 24" pieces of plywood and almost as
many boards grooved on only one side.

Remote possibility this will become a recurring need and I will be able to
afford machinery and or custom tooling to make this easy. For now I'm doing a
limited run of prototypes and could resort to cutting them one by one with a
circular saw. Perhaps even two at a time with two blades in a table saw. But
where is the fun in that?

Have access to an old 6" jointer and think modifying the knives with a series
of flats leaving a row of cutting tips spaced approximately 1/2" apart *might*
just work. Cutting at least 12 grooves in one pass.

Looking for ideas that are better than just goobering up a set of jointer
knives with a hand held abrasive blade. Have no free access to a surface
grinder or any machine shop equipment more sophisticated than a worn out
drill-mill combo.

BTW these grooves need to be slightly rough. While I want to avoid splinters
extremely smooth groves are not what I need or want. Nor do I want any radius
at the top or bottom of the grooves. This would defeat the whole purpose of
having grooves for the bats little toenails to grip
--
William

It sounds like you need a gang saw. This is not the best picture, but
it gives you the idea:
http://tinyurl.com/26xgbvd
Mostly used in industry, but I suppose that you could make one.