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#181 HowardsMF155 OFFLINE  

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Posted February 25, 2014 - 11:57 PM

Your math is right as far as it goes, but 1000 RPM is actually below factory idle for these machines if I remember correctly.  Your engine should be running at max speed,3000 to 3600 RPM when you are tilling.   You need to get more speed reduction.  Also, I think I saw somewhere that for power transmission, bigger pulleys are better.  The belt has a longer area to grip while going around the pulley and the leverage is better.  I would strongly suggest that you use the stock pulley under the tractor and put a larger pulley on the outside for the engine to drive.  I would tend to keep the small pulleys at the 90 to 100 mm size if that is the size of the original engine pulleys, and do all my speed reduction by driving 150-250 mm pulleys.

 

Keep in mind that as you lower your RPM that the torque available will go up.  So the engine at 3600 RPM may be able to put most of that power through a drive belt with 4 inch pulleys.  However, if the implement you are driving is going more slowly than the engine, the torque will be much higher.  I think the engine on your tractor will put out in excess of 15 Nm of force at peak power.  If you have a 10:1 reduction in your gearing, your tiller will still be turning at 360 RPM, but will have 150 Nm of force available.


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#182 cheluIS OFFLINE  

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Posted February 26, 2014 - 01:58 AM

I put 1.000RPM just to show the way of calculation . Start at 1.000 and at the tiller you have 250RPM . I know that the engine revs when tilling is over 2.000RPM .

I don't have bigger pulleys and if I had bigger pulleys there is no room under the tractor to put it.I'll see what I'll get in the end .


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#183 MH81 ONLINE  

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Posted February 26, 2014 - 07:03 AM

Have you devised a tightener system?

#184 cheluIS OFFLINE  

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Posted February 26, 2014 - 07:49 AM

If you mean a system that tension the belts , yes I have something in mind.I'm thinking at a 2 tension rollers on each side of the smaller pulley , with lever and spring.First I have to make the gearing and see what belts I need and what belts I find and then see how to make the tensioner.
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#185 MFGray OFFLINE  

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Posted February 27, 2014 - 11:25 PM

The MF650 tiller is supposed to run at 135 rpm and the engine at 2700 rpm (maximum torque). Your tiller is quite a bit larger, but you might want to gear it down a little.
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#186 cheluIS OFFLINE  

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Posted February 28, 2014 - 08:11 AM

@MFGray
Thank you very much for info.Very important for me.

#187 cheluIS OFFLINE  

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Posted March 15, 2014 - 03:58 PM

Things for my tiller are slow .

Had a lot of work at the office and above that my commander-in-chief (again read wife :worship: ) gave me another order . I have to give up a part of my shop for my son gym area . For this I had to make a handrail to the stairs to basement ."Sir , yes sir !" Had to comply ...

 

Made the frame inside .

Be1.jpg Be2.jpg

 

And wait the sun to get outside and finish .

 

Be3.jpg Be4.jpg

 

Have to sand it and paint it.

 

Back to my tractor . Made the bearing housings and the support for the pulleys .

 

Fu11.jpg Fu12.jpg Fu13.jpg

 

Installed under the tractor .Made 2/3 of gearing.

 

Fu14.jpg Fu15.jpg Fu16.jpg

 

Keep in touch.

 


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#188 Gabriel OFFLINE  

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Posted March 16, 2014 - 07:03 PM

Looks good!

#189 MH81 ONLINE  

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Posted March 16, 2014 - 09:54 PM

Nice handrail and glad you got a few minutes to work on the tiller.

#190 cheluIS OFFLINE  

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Posted April 06, 2014 - 02:16 PM

Hello again !

Had a lot of work lately so I didn't have much time for my project . But I did some things when found a little time , especially late at night .

 

Changed the regulator and grounded it well . It works fine and is charging when reving the engine up to 10 amps.

Ch1.jpg Ch2.jpg

 

I had to change the position of the pulley under the tractor becouse was touching the transmission secondary belt . I put a belt tension arm.

 

Fu001.jpg Fu002.jpg Fu003.jpg

 

Fu004.jpg Fu005.jpg Fu006.jpg

 

And of course finished the handrail and began to set up the gym area .

 

Be001.jpg

 

Next ... the tiller .


Edited by cheluIS, April 06, 2014 - 02:16 PM.

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#191 cheluIS OFFLINE  

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Posted April 06, 2014 - 02:31 PM

Last Saturday had a day off so early in the morning went to my shop.

In order to continue the gearing I had to make an attachement for the tiller .After 14 hours of non-stop working I came out with this.

T000.jpg T001.jpg T002.jpg

 

T003.jpg T004.jpg T005.jpg

 

T006.jpg T007.jpg T008.jpg

 

T009.jpg

 

Not very proud of the look but is strong and solid.

I want to make a try with the tiller without PTO , just carried behind the tractor .

 

The tiller have aprox .70 kg. so I have to put some front weights.The steering is very easy .

 

Keep in touch


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#192 limebuzz ONLINE  

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Posted April 06, 2014 - 06:18 PM

Looking good and strong Cheluis.Should work out good for you when you get it finished up.
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#193 Gabriel OFFLINE  

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Posted April 06, 2014 - 09:14 PM

Looks good!



#194 cheluIS OFFLINE  

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Posted April 07, 2014 - 06:52 AM

Can anybody tell me how much weights should I put in front of tractor to balance considering that my tiller has aprox. 70 kg. (140 lbs.) ?

Thanks.



#195 IamSherwood OFFLINE  

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Posted April 07, 2014 - 07:02 AM

That 140 lbs is quite a ways out the back, and you're not done adding

weight to it yet. Do you have access to any sort of weights, that you can just

keep adding more until your comfortable. Suit case weights?

Just a guess, but I'm thinking you'll need 150 lbs.






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