[How do I?] Sector Arms on a Dividing Head

HMF

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So I know that you use the sector arms to measure how much to move the pointer on the dividing head. Do you count from the inside of the sector arm or outside? Is there an easy way to move it for larger numbers?

Thanks,


Nelson
 
Nelson,

To take a page out of an old high school text book (literally), check out this explanation.
Sector Arms.jpg

For those more pdf-minded, here it is in that format.
View attachment Sector Arms.pdf

The book is Machine Shop Training (Second Edition)1967 McGraw-Hill.

Sector Arms.jpg
 
Awesome! Thanks!

Wondering if that book can still be bought.


:tiphat:Nelson
 
I got it at a used book sale. It had been marked for destruction.
 
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