|
Farmall & IHC Tractors Discussion Board |
Re: Questions About MIssing Teeth
[ Expand ] [ View Replies ] [ Add a Reply ] [ Return to Forum ]
Posted by chadd on April 26, 2007 at 12:30:26 from (155.92.32.116):
In Reply to: Questions About MIssing Teeth posted by A. Bohemian on April 26, 2007 at 07:58:14:
Most older tractors use spur gears in the transmission. A well designed, high stress, gear train using spur gears will have a contact ratio between gears of a minimum of 1.4, although the ratio can go as high as two. This ratio indicates how many teeth are meshed at once. Because you still have at least .4 of a tooth grabbing (I say at least because often, the root of the broken tooth remains)and the gears are rotating at a relatively low speed, the gear will not lock up or begin shearing gear teeth quite yet. However, there will be a noticeable clunk and whenever a large load is placed on the transmission, the remaining tooth will need to carry at least twice the load it was designed for. Under constant heavy load, it will weaken the remaining tooth every revolution, until it fails. That being said, many antique tractors are being used more for parade duty and light tasks that don't involve heavy drawbar pull. Because the gears were so over-engineered to begin with, they can last a long time before failure. I wouldn't try this with a car transmission, though, as it will be gone in a matter of a weeks due to higher speeds, closer tolerances, smaller factor of safeties, and helical cut gears. That is just my take on it, I am sure others will have other opinions. . .
Replies:
Home
| Forums
Today's Featured Article -
When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
Copyright © 1997-2024 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|
