|Forum topic by groland||posted 02-09-2009 12:05 AM||695 views||0 times favorited||1 reply|
02-09-2009 12:05 AM
I am cutting some very large mortises by hand in red oak. Tenons are ca. 3” L x 3” W x 1” thick. I pre-drilled the mortises a bit smaller-than-final-size with a drill press. This helps a lot because I can use the edges of the drill cut-outs as a partial gauge of the amount of wood I need to remove. I cut the tenons on a table saw, so they are nicely squared up and thicknessed and can be trimmed with a shoulder plane.
My problem is that while I can use a tracing of the tenon and a marking gauge at the outer edges of the mortise, I cannot figure out how to determine when I have chiseled out inner planes that are flat and parallel to the outer planes of the stock. I’d like a nice fit, not concavities and convexities inside the mortise “cheeks”. Is there a simple gauge or method of determining this or is cut-and-try the best I can do?
One piece of advice—NEVER try, for your first piece of joinery, through-M&T joints. What was I thinking? ARRGH.
Thanks for any suggestions,