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[4]

Poor Man Dividing

January Project of the Month [3]
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jocat54

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Dec 25, 2011
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#1
Using a cheap rotary index and some 1/4" x 5 1/2" acrylic discs. Drilled the holes using the DRO bolt circle function. Made 5 discs using numbers not possible with the original rotary index, up to 48. May make more if needed--they are pretty easy to make

dividing.jpg dividing1.jpg
 

Whyemier

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#5
Actually was wondering if something like that was possible and how to implement it. Thank you!:aok:
 

Hukshawn

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#7
What is the "dro bolt circle hole function"?
 

jocat54

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#8
It is a function of some?(most)? DRO's that will give the coordinates of the xy axis to drill holes for a given diameter.
You enter your center of a cirlce x-0/y-0 and the diameter of the circle you want, the number of holes, the start and end angles.

Edit: Also known as Pitch circle diameter--probably the correct name.
 
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larry4406

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#10
I am a newbie reading a lot.

I've seen the threads on using saw blades and counting teeth.

Anyone ever used a cross drilled brake rotor? Not sure the patterns used for drilling.

Cross-Drilled-Rotor.jpg
 
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