John Deere

[charlesfitton]

My question - brief as possible...


for such ancillary equipment as balers and such, What gear form would this world famous company have used? I'm talking early years here, maybe even 19-oh-whatever..

The readers' digest version...

My friend - I'll call him Henry - was displaying a very vintage straw baler at a local ploughing match. Medium sized, open frame, no safety anything. The straw was a bit wet, a pillow block shifted a bit, and a huge bull gear and a few pinion gears decided that it was time for a bit of dental work.

I'm doing a bit of homework in order to help him out, Maybe offer to make the pinions, and I can't even picture the size of equipment that would be needed to remake or repair the big gear. I only saw it the one time - it may be as much as 4' dia.

Regardless, even if I can get the correct nomenclature for the gear form its a start. Hints on repairing the big gear would be nice too.

I'm thinking take a mold/pattern from the good section...drill and pin with steel rods, and cast brass to replace the broken teeth...

Thanks gents..

 

[Tin Falcon]

There are many period turn of the century machining and machine repair , machine blacksmiting books available on google books and Archive.org.

These should give some procedures . Sorry do not have a title or chapter off hand.
Sounds like you are on the right track the other option is to cut a dovetail and dovetail a new tooth in.
Tin

 

[Teza]

It is entirely possible to build up a new tooth with weld then grind it to shape, have done this and seen it done to good effect on farm machinery on several occasions.
Regards Terry

 

[charlesfitton]

I'm still hoping to find out details of the gear pitch and form, as well as any suggestions about repair options.

f

 

[gbritnell]

For larger tooth forms they were actually cast to shape way back when. As to what the tooth profile might have been I can't say. The only two that I know of are 14-1/2 and 20 pressure angle of which the former is the earliest. If the teeth are too large to weld then they can be machined and welded on.
gbritnell