I am currently making new arbors for my horizontal mill. The arbors that came with it have metric diameter shafts (22mm and 27mm) and I needed a 1" and 1 1/2".
I am close to finishing the 1 1/4" arbor with I notice something odd about 1 1/4" id mill cutters. I was doing a test fit using a used gear hob I have and it did not fit.
I measured the arbor and it measured 1.250" but when I measured the id. of the gear hob, it measured 1.247". I remeasured both with another dial caliper and got the same result. I then pulled out two stagger tooth mill cutters that I have (1 1/4" id) both measured 1.248".
It occured to me to check all my 1"id cutters and they measured between 1.000" and 0.999" ( this is what I would have expected)
All the cutters and the hob are US made.
My question is: Do the larger id. mill cutters have a wider tolerance or is this just a fluke.
mhooper
I am close to finishing the 1 1/4" arbor with I notice something odd about 1 1/4" id mill cutters. I was doing a test fit using a used gear hob I have and it did not fit.
I measured the arbor and it measured 1.250" but when I measured the id. of the gear hob, it measured 1.247". I remeasured both with another dial caliper and got the same result. I then pulled out two stagger tooth mill cutters that I have (1 1/4" id) both measured 1.248".
It occured to me to check all my 1"id cutters and they measured between 1.000" and 0.999" ( this is what I would have expected)
All the cutters and the hob are US made.
My question is: Do the larger id. mill cutters have a wider tolerance or is this just a fluke.
mhooper