Simple Dividing Head

[old_toolmaker]

Hemi,

Yes, I did see your PM. Thank you!

[Alan Purdy]

Interesting coincidence; I just picked up some 96 tooth gears at AS&S https://www.sciplus.com/3116-plastic-gear-58018-p with the thought of building something like this.

This is a handy number because it gets you a lot of divisions out of one gear: 2, 3, 4, 6, 8,12,16,24,32,48 and I hate 1, 2,3,4,oops did I skip a tooth? So I have written a program to make a PDF with common divisions to glue into the gear. Right now it's a prototype, but I should be able to make it fully parametized: OD, ID, #teeth, desired divisions, etc, and stick it up on a website somewhere.

Attachment 25545

I suffer “aphasia”, stroke which means. I am unable to talk. Only “paste & copy” I am unable spelling.

Indexing Wheel Hole Patterns - Evenly Spaced Layout Options

Calculated and engineered 14, 36, 48 and 60-hole patterns allow for 20 obvious, symmetrical, evenly spaced layout combinations, as well as hundreds of asymmetrical layout combinations.

14 Hole pattern makes 2-7-14 evenly spaced layout options
24 hole pattern = 15° between holes
36 Hole pattern makes 2-3-4-9-12-18-36 evenly spaced layout options
48 Hole pattern makes 2-3-4-6-8-12-16-24-48 evenly spaced layout options
60 Hole pattern makes 2-3-4-5-6-10-12-15-20-30-60 evenly spaced layout options
Index – 20 different Even Combinations by degrees. (Even more options by skipping holes.)

02 hole pattern = 180° between holes
03 hole pattern = 120° between holes
04 hole pattern = 90° between holes
05 hole pattern = 72° between holes
06 hole pattern = 60° between holes
07 hole pattern = 51.4° between holes
08 hole pattern = 45° between holes
09 hole pattern = 40° between holes
10 hole pattern = 36° between holes
12 hole pattern = 30° between holes
14 hole pattern = 25.7° between holes
15 hole pattern = 24° between holes
16 hole pattern = 22.5° between holes
18 hole pattern = 20° between holes
20 hole pattern = 18° between holes
24 hole pattern = 15° between holes
30 hole pattern = 12° between holes
36 hole pattern = 10° between holes
48 hole pattern = 7.5° between holes
60 hole pattern = 6° between holes
Can someone describe the difference in the final ground results between the 30 degree straight holder and the 12 degree compound one?
The 30 degree would seem easier to make but there must be a good reason for the 12 degree compound one too

[bruce.desertrat]

Bruce,
NICE find!!!!! I'm even looking into that one!!!!

Dick,
Please see my PM! Thanks my friend!

Yeah AS&S is a really interesting place; I tend to find things I want/need pretty regularly, and thier prices are generally good. Even picked up a couple of these https://www.sciplus.com/80mm-roller-...earing-60117-p and yes they are truly huge. Some googling turned up that they are replacement bearings for a disk harrow disk , as in https://en.wikipedia.org/wiki/Disc_h..._-_1758939.jpg

Just be aware they are definitely surplus, and things come and things go. So I've often picked up things just on spec.

[DIYer]

Thanks old_toolmaker! We've added your Dividing Head to our Lathe Accessories category,
as well as to your builder page: old_toolmaker's Homemade Tools. Your receipt:

Dividing Head by old_toolmaker

tags: divider

[old_toolmaker]

Alan Purdy

Thank you for your response!! It is all good information.