I'm building a steam engine model that requires me to drill some 1/2 x 1/4 mortise & tendons. the wood is 3/4 x3/4.
I scribe a line in the center 5/16 half of 3/4 and I dilled two 1/4 holes. I then tried to cut off the excess with 1/4 bit in a colt router. It ended up to big. I was hard for me to tell wear the bit on the back side. I tried a smaller bit and still managed to rag it out.
I'm not going to try square it on the mortise or tendons, so just looking for ideas. I like to make a pattern but there isn't way to get a bass follower that small that I know of. Any thoughts would be appreciated.