Having major dificulties tracking down any 10tpi Acme here in oz... I can however get hold of trapezoidal TR 20x4 which gives me roughly 6tpi.
Now for the question. Why is 10 tpi considered the standard in all of the reading I have done on these forums?
Why couldnt TR 20x4 be used ie 6tpi??? or at least why shouldnt it?
Look forward to advice.