bugbear":lgh1p7i2 said:
....
Yebbut, you set the mortise gauge to the mortise chisel; thus the mortise is automatically the right size, made in a single pass of cuts, and you were going to have to cut the tenon in two separate line anyway, so there's no extra effort. Works for me, but if you have counter examples, I'm happy to listen.
And I'm happy to explain - you have picked up some bad habits!
If you are doing a lot of stuff, say 5 windows with glazing bars, you could have something like 100 or so M&Ts to cut. You set your gauge to 1/2" and mark
all your mortices and
all your tenons. You can then put the gauge away. You then cut all your mortices with a 1/2" chisel, and all your tenons to the lines you have made. That's all there is to it.
If you have an odd sized chisel and set the gauge accordingly the M&Ts will fit but other details may be out of line. Or if you swap odd sized chisel halfway through you may hit problems. You may need to think about this, but take your time
It also mattered in the past.
If you could add context, explanations or examples to your assertions, the discussion might be more fruitful. I know pantomime season draws nigh, but I'm not going to play "oh yes it is" "oh no it isn't" with you.
BugBear
If you look at the history of maths, science, engineering, technology, and trade, you will find that standardised measurements have been an ideal from very early on, so that when someone asked for say a 1/4lb of tea, or a 1/2" tenon, then someone else would be able to provide one, having to hand as near as possible a standard weight or measure. I'm surprised you didn't know this - it didn't just come in with plywood and industrial production.
So when people order 1/2" chisels that is what they should expect to get. It's not rocket science. Our OP has a 5mm chisel sold as 6mm. He should send it back. The others aren't too accurate either.