For those using conventional gear hobbers:

- After determining the ideal ratio needed to fabricate a helical gear,
how do you determine the best combination of (A/B)*(C/D) in your
gearbox that closely approximates the ratio?

- how often do you need to change your gear setup?

- how long does it usually take for you to find the right values for A,
B, C, and D? (half an hour? an hour?)

....
- After determining the ideal ratio needed to fabricate a helical gear,
how do you determine the best combination of (A/B)*(C/D) in your
gearbox that closely approximates the ratio?

- how often do you need to change your gear setup?

- how long does it usually take for you to find the right values for A,
B, C, and D? (half an hour? an hour?)

This can indeed be a difficult problem for odd sizes. Here's a web site that
has a great discussion group on hobbing, and offers computer software to
solve the gear train setup:

http://www.meshingwithgears.com/index.html


FWIW, hobbing for the hobbyist pun has been a great interest of mine.
Electronic gearing is the solution for this problem. You slave the index
drive to the spindle. Everything can then be done on a knee mill and
indexing head. A fellow named Jon Stevenson has one up and running. Another
fellow, named Don Foreman, has designed and built a better brainbox. Just
for me. He'd be glad to share with anyone. I was all set to have it running
last winter until more urgent matters intervened.

Karl

The very current issue of Model Engineer's Workshop, the British mag, has an
article on gear hobbing which uses electronic synchronization.

GWE

Karl Townsend wrote:

...

- After determining the ideal ratio needed to fabricate a helical gear,
how do you determine the best combination of (A/B)*(C/D) in your
gearbox that closely approximates the ratio?

- how often do you need to change your gear setup?

- how long does it usually take for you to find the right values for A,
B, C, and D? (half an hour? an hour?)


This can indeed be a difficult problem for odd sizes. Here's a web site that
has a great discussion group on hobbing, and offers computer software to
solve the gear train setup:

http://www.meshingwithgears.com/index.html


FWIW, hobbing for the hobbyist pun has been a great interest of mine.
Electronic gearing is the solution for this problem. You slave the index
drive to the spindle. Everything can then be done on a knee mill and
indexing head. A fellow named Jon Stevenson has one up and running. Another
fellow, named Don Foreman, has designed and built a better brainbox. Just
for me. He'd be glad to share with anyone. I was all set to have it running
last winter until more urgent matters intervened.

Karl

Marv Klotz has a program to do just that, I think.

http://www.geocities.com/mklotz.geo/gearatio.zip

That might not be the best of his programs though, there might be
something better suited.

-Justin

The website sells the software for $225? Is that an acceptable price?

Posted and Emailed
Would you please send me a copy? I'd be most interested.

Karl


"Grant Erwin" wrote in message
...
The very current issue of Model Engineer's Workshop, the British mag, has
an article on gear hobbing which uses electronic synchronization.

GWE

Karl Townsend wrote:

...

- After determining the ideal ratio needed to fabricate a helical gear,
how do you determine the best combination of (A/B)*(C/D) in your
gearbox that closely approximates the ratio?

- how often do you need to change your gear setup?

- how long does it usually take for you to find the right values for A,
B, C, and D? (half an hour? an hour?)


This can indeed be a difficult problem for odd sizes. Here's a web site
that has a great discussion group on hobbing, and offers computer
software to solve the gear train setup:

http://www.meshingwithgears.com/index.html


FWIW, hobbing for the hobbyist pun has been a great interest of mine.
Electronic gearing is the solution for this problem. You slave the index
drive to the spindle. Everything can then be done on a knee mill and
indexing head. A fellow named Jon Stevenson has one up and running.
Another fellow, named Don Foreman, has designed and built a better
brainbox. Just for me. He'd be glad to share with anyone. I was all set
to have it running last winter until more urgent matters intervened.

Karl

On 21 Aug 2005 20:47:52 -0700, "Justin" wrote:

Marv Klotz has a program to do just that, I think.

http://www.geocities.com/mklotz.geo/gearatio.zip

That might not be the best of his programs though, there might be
something better suited.

-Justin


Yes, GEARATIO. He may also want to take a look at GEARFIND.
Both are free for the downloading.


Regards, Marv

Home Shop Freeware - Tools for People Who Build Things
http://www.geocities.com/mklotz.geo

The performance on these applications is not that good. I'm going to
build my own gear set finder instead. It will have the ability to
search for 2-gear, 4-gear, and 6-gear combinations. I'm also going to
put in the ability to remember configurations for multiple machines, as
well as a ratio calculator.