Go Bottom

Speedometer

View my Photos
Dave K
Join Date:
Posts: 1
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-03          40022


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



Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
DRankin
Join Date: Jan 2000
Posts: 5116 Northern Nevada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2002-07-03          40023


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. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
BillMullens
Join Date: Jun 2000
Posts: 649 Central West Virginia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2002-07-03          40039


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 ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-04          40044


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.
....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
jd110_1963
Join Date: Feb 2002
Posts: 87 westminster, md
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-04          40049


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. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
DavidJ
Join Date: Jul 2003
Posts: 62 Alabama
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-04          40051


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. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
kay
Join Date:
Posts: 1
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-04          40052


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? ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
kay
Join Date:
Posts: 1
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-04          40053


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? ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
TomG
Join Date: Feb 2002
Posts: 5406 Upper Ottawa Valley
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2002-07-05          40057


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.
....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
BillMullens
Join Date: Jun 2000
Posts: 649 Central West Virginia
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2002-07-05          40058


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 ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
cutter
Join Date: Feb 2000
Posts: 1307 The South Shore of Lake Ontario, New York
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2002-07-05          40059


I have a hand held GPS that also has a dash mount bracket and power adaptor. I have used it to determine the speed of the machine while applying liquid with my sprayer. Once you have the RPM's right for the pump, you can make trial runs with a measured amount of plain water in the tank or simply use the application guide that comes with the sprayer (if you have one). I used a good average of both the guide and the actual test I devised. As I mentioned, after you have the RPM correct for your use, use the GPS to determine what gear (if you have a gear tractor) or the amount of depression required on the HST pedal. Since there is lag time in the speed calculations by the GPS unit, make sure you operate for a long enough period to obtain accurate readings. Once I had this part of it done, I did not have to keep the unit on board and my application worked perfectly. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
Zippy-Do-Da
Join Date: Apr 2004
Posts: 36 Winnipeg, MB
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2004-04-11          82753


Check out www.vansco.ca, I work here and they probably have a solution. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
oneace
Join Date: Mar 2004
Posts: 1490 south central pa
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2004-04-11          82760


you might be suprised but nh has a system that will actually steer the tractor, operate the hydraulics, turn on and off the pto, and set the gears automaticly. on the large tractors of course. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo



Speedometer

View my Photos
hardwood
Join Date: Dec 2002
Posts: 3583 iowa
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2004-04-11          82766


The three biggest JD tractors we use at the farm, 8410, 8300, and 7810 have shaft sensors for ground speed plus a doppler gun that calibrates distance, the onboard computer calibraters the two at the rate of something like 200 times a second. The result is true ground speed from the doppler and also the percentage of wheel slip at any given time, acres covered per hour, etc. etc. When we got the 8410 new in either 2000 0r 01 Deere put a gps guidance unit on it for experimental purposes, it did'nt work too well then, but now they have the "Green Star System" that has been perfected enough that when you come to the end of the field to turn around you take the wheel and once you have manualy steered it to more than 180 degrees of the full turn you let go of the wheel and the GPS takes over and guides it to the other end of the field at the exact distance from the last pass that is required. We're not using the GPS yet, but I'm sure my son someday will. Sometime at the Deere dealer pick up a brocure for the 8000 twenty series or the 7000 twenty series, they have even more advanced features than our 10 series in the field of GPS. Frank. ....


Reply to | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo


   Go Top


Share This







Member Login