Subject: Home-made Dividing Head??????

From: robert brown <[email-masked]>
Date: Wed, 03 Jul 1996 13:58:22 -0700

I can recommend the George Thomas Dividing Head, Al, having built one 
some number of years ago. The compound indexing feature, if you choose to 
build it, means that you can get virtually any number of divisions you 
like. The design is worth looking at, even if you plan to use one of your 
worm boxes. The number of teeth in the wormwheel govern the number of 
divisions you can get in plain indexing. You will get the idea by looking 
at the following, which gives the number of factors in wheels of 
different tooth count:-

		Tooth Count		Factors
		60			1,2,3,4,5,6,10,12,15,20,30,60
		40			1,2,4,5,8,10,20,40
		30			1,2,3,5,6,10,15,30
		20			1,2,4,5,10,20

	As you can see, a 60T wheel is desirable, but if you plan to use 
your worm boxes, use the 30T one for preference. Build in some provision 
for backlash elimination or absorption and some form of lock for the 
spindle.
			Best Wishes and Good Luck

				Rob. Brown