I recently purchased a couple of taps for making wood threads. One is 2 1/4 diameter, the other 2 1/2. Good sizes for making bench vise screws right? The problem is that the thread angles are like 60 degrees. I know that after like 1860s or 1870s 60 degrees became a bit of a standard. Wood threads need to be 90 degrees for best results right? But if taps were made with 60 degree threads, I'm guessing enough people used them that it should be ok. What do you guys think? Aren't the new commercial taps you can buy, all kind of small, 60 degrees?