Speedometer: Tractor Projects  -- General Tractor Discussion Forum and Review Speedometer: Tractor Projects -- General Tractor Discussion Forum

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 07-03-2002, 08:45 Post: 40022
Dave K
2002-07-03 08:45:52
Post: 40022
 Speedometer

Does anybody make a speedometer for the New Hollond TC series tractors?






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 07-03-2002, 09:53 Post: 40023
DRankin



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 Speedometer

Even if they do, I would bet a small GPS unit would be cheaper. I have found GPS to be quite accurate in terms of ground speed. I have compared the readings side by side with calibrated police radars.






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 07-03-2002, 23:39 Post: 40039
BillMullens

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 Speedometer

I agree that a GPS would make an accurate speedometer. Though an interesting project may be in adapting an electronic bicycle speedometer to a tractor. They are cheap and use a magnetic sensor on the wheel.
Bill






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 07-04-2002, 07:16 Post: 40044
TomG

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A GPS for a speedometer is an interesting idea. Somebody who knows about them may be able to say if a GPS needs to see three of four satellites for ground speed info.

Speedometers for tractors would be a bit complicated. The tach on my 1710 has ground speed scales for four of 12 gears below the RPM scale, but they are accurate only with R1 tires and I have turfs. There is no relation between engine RMP and ground speed with HST so ground speed scales on an engine tach wouldn’t work for a HST tractor. A true speedometer output would about have to be off the range output shaft or differential input shaft. Separate gear sets would have to be provided to allow for different tire sizes. Even then, appreciable tire slip is expected heavy ground engaging operations, so tire rotation and ground speed isn’t the same thing. Few operations actually require knowledge of ground speed, so I guess that's why tractor designers omitted speedometers.






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 07-04-2002, 12:52 Post: 40049
jd110_1963



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 Speedometer

Actually, larger farm tractors do use speedometers. Most have sensors on the output shaft. Others have optional radar guns hooked to the speedo for accurate readings. Todays equipment also uses GPS for measuring yields and getting accurate application of chemicals, seed, and fertilizers.






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 07-04-2002, 15:36 Post: 40051
DavidJ



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 Speedometer

GPS needs to see 3 satellites to measure ground speed. In an open area that's not a problem you can usually see 6 or more. If all you can see is three, and they're adjacent, it'll take a few seconds of movement to get a good reading. The more you can see and the further the spread the quicker and more accurate the number will be. I don't think that will be an issue for most tractors because being that precise is not required.






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 07-04-2002, 21:20 Post: 40052
kay



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 Speedometer

One question, would be why do you want the speedometer? Just to know? or are you using the tractor to apply a pesticide or such? GPS could be accurate for a certain time (access to three or more satelites) in the field but not accurate if not in the open. Ground sensitive instrumentst would by-pass any slippage of the wheels, such as the case when monitoring the internal shaft rpm's and also not be influenced by tire size. If calibrating the tach( engine rpm's) to speed would be sufficient, then it can be done on a measured stretch of road and a stop watch (or the second hand on a watch). Once the tachometer is calibrated, then it can serve as a pretty accurate speedometer. Not sure which is best for you?






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 07-04-2002, 21:21 Post: 40053
kay



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One question, would be why do you want the speedometer? Just to know? or are you using the tractor to apply a pesticide or such? GPS could be accurate for a certain time (access to three or more satelites) in the field but not accurate if not in the open. Ground sensitive instrumentst would by-pass any slippage of the wheels, such as the case when monitoring the internal shaft rpm's and also not be influenced by tire size. If calibrating the tach( engine rpm's) to speed would be sufficient, then it can be done on a measured stretch of road and a stop watch (or the second hand on a watch). Once the tachometer is calibrated, then it can serve as a pretty accurate speedometer. Not sure which is best for you?






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 07-05-2002, 06:19 Post: 40057
TomG

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Thanks for pointing it out. I'm becoming aware that modern farm tractors can be equipped with all sorts of technology that 10-20 years ago would have been entirely for military applications. If pressed, I'd also be aware that sensors have replaced gears in many applications.

I suppose it's conceivable that a future tractor could start and hook itself up, wake up the owner; find its own way to what ever field needed to be worked; do what needed doing; and bring the owner back home for supper. Don't know but the idea isn't not entirely fanciful since cruise missiles are in that ball park and they are pretty old technology.

There was an article in the paper awhile back. There is a robot milking system. A cow who feels the need simply walks into the unit, which dispenses food, washes appropriate parts, attaches the milker and sends her on her way when finished. Each cow has an ID chip and the robot is connected to a computer. The computer keeps tract of the cows. It rejects a cow that tries to use the robot too often and warns the farmer about those that don't use it.

My understanding of the article was that the robot was installed at a working dairy farm. The farmer said that he thought the cows seemed to like the robot better than the traditional schedule. Wonder what farm kids do morns and evenings nowadays. Oh well, I suppose that went out with speedometer gear drives.






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 07-05-2002, 06:35 Post: 40058
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Local GPS systems have been developed for the mining industry that give centimeter-level accuracy. The base GPS is installed at the office and wired to a computer; units are installed in dozers, excavators or trucks. The mobile units resemble laptop computers but with no keyboards (not tough enough for the work environment), they have touch screens for interfacing with the equipment operators. The GPS and software let the equipment operators know how much cut/fill is needed, where cut lines end, edge of permitted area, etc. They say that the operators love them. I supposed this kind of setup is similar to what farms are using.
Bill






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