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Good question.
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Gear help needed
- Thread starter Suzuki4evr
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Do you have a 19 hole plate?
Making a plate up with the DRO will work well. For one offs 3D printing is quite good enough if you've got that capability. Differential indexing is pretty fun, though.
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I do.
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So do I have it correct if I make one rotation plus one hole on the the 19 hole plate to make a 57 tooth gear?
Do you have a 19 hole plate?
Making a plate up with the DRO will work well. For one offs 3D printing is quite good enough if you've got that capability. Differential indexing is pretty fun, though.
- Joined
- Dec 23, 2019
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- 1,138
No, looking at it, 57 is actually a bit of an oddball case. It's not prime itself, but is only divisible by primes. So even with a 19 hole plate, you still can't index 57. Custom plate or differential or differential setup it is!
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Michael,
Your gears look great!
Of course, it would be good to understand where the error crept in on the 57 tooth gear.
From this table you showed:
It looks like you need gears A, B and E in the gear train to the dividing head input shaft when cutting a 57 tooth gear.
I don't think it's that easy......
The output depends on the ratio of the worm and wheel in the dividing head, the hole plate used, plus every other gear in the train.
If you can supply the ratio, and what plates (and gears) you do have, I can help work out other possible combinations.
-brino
Your gears look great!
Of course, it would be good to understand where the error crept in on the 57 tooth gear.
From this table you showed:
It looks like you need gears A, B and E in the gear train to the dividing head input shaft when cutting a 57 tooth gear.
I don't think it's that easy......
The output depends on the ratio of the worm and wheel in the dividing head, the hole plate used, plus every other gear in the train.
If you can supply the ratio, and what plates (and gears) you do have, I can help work out other possible combinations.
-brino
- Joined
- Sep 29, 2017
- Messages
- 2,251
I mentioned it in post #9. Ratio is 40:1 I think.
- Joined
- Sep 29, 2017
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No harm done.For the universal dividing head I have the 40 and 48 gear but only one plate that goes to 39holes. But like I said there are other components I'll have to make first to be able to use the universal DH for this tipe of operation. My Vertex BS-0 DH has all the plates.
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- Jan 2, 2014
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- 8,852
Nope. Sorry.
You need a 57-hole plate and to advance 40 holes for each tooth for a 57-tooth gear.
Otherwise you need to do more complex differential indexing.
If it had been a 90:1 ratio, we could have got there!
(one full turn and 22 holes on a 38 hole plate)
That's probably the way to go.
Note to check before you start how many holes to specify.
Apparently on some DRO's you may need to specify N+1 or 58 holes _IF_ you specify both start and end angles the same......see this thread:
https://www.hobby-machinist.com/threads/do-what-i-want-not-what-i-say.84534/post-748360
-brino
You need a 57-hole plate and to advance 40 holes for each tooth for a 57-tooth gear.
Otherwise you need to do more complex differential indexing.
If it had been a 90:1 ratio, we could have got there!
(one full turn and 22 holes on a 38 hole plate)
That's probably the way to go.
Note to check before you start how many holes to specify.
Apparently on some DRO's you may need to specify N+1 or 58 holes _IF_ you specify both start and end angles the same......see this thread:
https://www.hobby-machinist.com/threads/do-what-i-want-not-what-i-say.84534/post-748360
-brino