Fixing broken teeth on a gear?
#1
Typical Buck
Thread Starter
Join Date: Feb 2003
Location: Coffeyville KS USA
Posts: 931
Fixing broken teeth on a gear?
I recently bought an old Dearborn 2 row corn planter. 2 of the teeth on the cone shaped gear that turns the gear for the seed plate are broken. This gear probably doesn' t turn very fast, maybe 10-20 rpms. It probably doesn' t have much stress either, maybe 20 or so pounds of pressure when the teeth engage the other gear.
Any ideas how to fix it?
Any ideas how to fix it?
#3
Nontypical Buck
Join Date: Feb 2003
Location: Ontario Canada
Posts: 2,059
RE: Fixing broken teeth on a gear?
If it' s cast it' s almost impossible to weld. We' ve used exopy metal kits on castings at work and I even used the same kit to rebuild the bottom end of my boat motor. Alternately, you may want to try bolting a machined piece of metal into the space where the tooth was.
Dan O.
Dan O.
#4
Boone & Crockett
Join Date: Feb 2003
Location: Ponce de Leon Florida USA
Posts: 10,079
RE: Fixing broken teeth on a gear?
If all else fails, you may be able to drill a couple of holes in line with the position of the teeth, screw in a couple of short bolts, and then grind the bolts to fit in the gear. I' ve seen old cane mills with this done and it seemed to work pretty good.
#5
Typical Buck
Join Date: Feb 2003
Location: Livonia Mi USA
Posts: 551
RE: Fixing broken teeth on a gear?
Try http://www.yesterdaytractor.com and see if you can get some help with the gear. Nothing on the internet? http://www.ytmag.com/implment/messages/archive23.htm
Try this page.
Try this page.
#6
Join Date: Feb 2003
Location: Walnut MS USA
Posts: 871
RE: Fixing broken teeth on a gear?
That cast can be welded. Take it to a shop where they have Stainless Steel rod. A good welder will be able to rebuild those teeth. They have to be carefull to not get the cast too hot, but it can be done. I have added metal to worn teeth and then ground them down to the right shape. The trick here is finding a Welder' s welder. (In other words, a master welder.)
Russ
Russ
#7
Join Date: Feb 2003
Location: Ferry Township, Michigan United States
Posts: 165
RE: Fixing broken teeth on a gear?
I agree, a good welder with the right rod can build up the teeth and grind them to match the original. The are all kinds of specialty rod now. The gear will most likely have to be pre-heated to a specified temperature before welding. [&:] terry
#8
Typical Buck
Thread Starter
Join Date: Feb 2003
Location: Coffeyville KS USA
Posts: 931
RE: Fixing broken teeth on a gear?
i took it to a welder. 20 bucks and he was able to build up the area where the teeth were missing. i spent an hour or two with a dremel tool and was able to shape two teeth.
#9
Join Date: Feb 2003
Location: Ferry Township, Michigan United States
Posts: 165
RE: Fixing broken teeth on a gear?
Wow, you' ve done a darn nice job. I' m really glad everything worked out for you and 20 bucks is pretty cheap. Thanks for posting the picture, you made my day. terry[&:]