Dividing a circle by 359

Karl_T,

I have not read any information where someone was successful or even to tried to directly hob a blank without gashing it first. It seems like it would not work very well and not the direction I want to go even if one can do it.

The last link 'doing it yourself' links to another site where the guy does just that, hobs a gear in a lathe in the method you've described, but even he gashes it first. Here's the link to the site documenting the worm drive used in the previous article if you're curious.

I found information on hobbyists making 360t gears& worm drives but only professional companies selling 359t gears (for good reason, perhaps) but there you have it, I want to do something I wasn't able figure out on my own by just searching the internet.
 
Like I said, I've not done this. For sure, I can see gashing it first would greatly improve the job. The big advantage is getting zero backlash.
 
stuartw said:
But what about a number of divisions that's much larger, in this case 359?
Click to expand...

What material thickness, type of material and hole diameter are you looking for? I would just laser cut this...if you want I could help you with that...let me know!
 
this is a silly question, maybe someone has an answer for, I find the occasional reference to tables in the machinery's handbook, but, I can't seem to find a table anywhere that relates to compound indexing. It feels like some kind of private joke when people say you should check this book, I have it but can find no tables that relate to dividing. I have an ebook of the most recent ed. Anyone know what section it might be found in? compound indexing, dividing are not found in the index and there is no section under measuring and marking that I can see.
 
stuartw said:
Karl_T,

I have not read any information where someone was successful or even to tried to directly hob a blank without gashing it first. It seems like it would not work very well and not the direction I want to go even if one can do it.

The last link 'doing it yourself' links to another site where the guy does just that, hobs a gear in a lathe in the method you've described, but even he gashes it first. Here's the link to the site documenting the worm drive used in the previous article if you're curious.

I found information on hobbyists making 360t gears& worm drives but only professional companies selling 359t gears (for good reason, perhaps) but there you have it, I want to do something I wasn't able figure out on my own by just searching the internet.
Click to expand...
I have chart to 250
I will look for my Excel work sheet for 359
Cincinnati's milling machine has chart for compound indexing to 1,000

Dave

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After reading your explanation a couple of times, I am starting to grasp the concept of what you're doing. I'm not into astronomy, a couple of steel mills too close. Light polution........ It seems to me you don't need to go all the way around, simply a quadrant would suffice. That could be driven by a couple of stages of worm and pinion, adjusted to a clock. As in move "x" degrees in "y" minutes. Final speed adjustment would be as simple as a servo motor with a good power supply. The other possibility is that I am so far off the track that I just want to answer and can't really help.
 
For 90 tooth worn for 359 teeth
Plate B
Use 33 and 27
It will take 11 turns

If your ratory table or indexing head is not 90 teeth let know it on takes a minute for any other number

Dave

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Compound infexing is found in books dating back to 1900

You find this old machinest Hand book as late as the 1950's

Some milling company use on there dividing head as late as 1970

Dave
Bi11Hudson said:
After reading your explanation a couple of times, I am starting to grasp the concept of what you're doing. I'm not into astronomy, a couple of steel mills too close. Light polution........ It seems to me you don't need to go all the way around, simply a quadrant would suffice. That could be driven by a couple of stages of worm and pinion, adjusted to a clock. As in move "x" degrees in "y" minutes. Final speed adjustment would be as simple as a servo motor with a good power supply. The other possibility is that I am so far off the track that I just want to answer and can't really help.
Click to expand...

Sent from my SAMSUNG-SM-J320A using Tapatalk
 
The hard part of compound indexing
Is when you find index number is not found on the chart .
I use a Excel spreadsheet witch fast to the plate and holes need and number of turns need
Then just use calculator to find the spacing

Dave
Bi11Hudson said:
After reading your explanation a couple of times, I am starting to grasp the concept of what you're doing. I'm not into astronomy, a couple of steel mills too close. Light polution........ It seems to me you don't need to go all the way around, simply a quadrant would suffice. That could be driven by a couple of stages of worm and pinion, adjusted to a clock. As in move "x" degrees in "y" minutes. Final speed adjustment would be as simple as a servo motor with a good power supply. The other possibility is that I am so far off the track that I just want to answer and can't really help.
Click to expand...

Sent from my SAMSUNG-SM-J320A using Tapatalk
 
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