Mistake #1
For Christmas my girlfriend wanted to get me a chucking reamer set I had looked at at one one point. Because I have been wanting to cut gears I asked for a dividing head instead. I directed her to the BS1 type that Grizzly sells. I knew there was a problem when I tried to move it and it weighed what felt like seventy pounds. I barely have 6" between centers. A BS0 type dividing head would have been much more suitable for my RF25 mill.
Mistake #2
I have cut a couple of gears using my new (over sized) dividing head. Once I understood the formulas involve for gear cutting and watching Tubalcains videos a few times I thought I had it down. The first couple of good gears I cut were all direct indexed. When I needed to cut a 35 tooth gear is when the trouble started. I'm 46 now and haven't worked with fractions for over 26 years. My calculation was 40/35 = 1 5/40 = 1 1/8 instead of the correct 1 5/35 = 1 1/7! I bolted on a plate with a 16 hole circle and away I went with 1 turn and skip two spaces. When I got to my last gear tooth, I was shocked!
To make this gear blank on my Sherline lathe requires I use riser blocks and care because this is really large for this lathe.
Back to 6th grade math class I go.:fan:
Enough of what a dummy I am for now.
Paul
For Christmas my girlfriend wanted to get me a chucking reamer set I had looked at at one one point. Because I have been wanting to cut gears I asked for a dividing head instead. I directed her to the BS1 type that Grizzly sells. I knew there was a problem when I tried to move it and it weighed what felt like seventy pounds. I barely have 6" between centers. A BS0 type dividing head would have been much more suitable for my RF25 mill.
Mistake #2
I have cut a couple of gears using my new (over sized) dividing head. Once I understood the formulas involve for gear cutting and watching Tubalcains videos a few times I thought I had it down. The first couple of good gears I cut were all direct indexed. When I needed to cut a 35 tooth gear is when the trouble started. I'm 46 now and haven't worked with fractions for over 26 years. My calculation was 40/35 = 1 5/40 = 1 1/8 instead of the correct 1 5/35 = 1 1/7! I bolted on a plate with a 16 hole circle and away I went with 1 turn and skip two spaces. When I got to my last gear tooth, I was shocked!
To make this gear blank on my Sherline lathe requires I use riser blocks and care because this is really large for this lathe.
Back to 6th grade math class I go.:fan:
Enough of what a dummy I am for now.
Paul