Screw drive garden tractor

CNC Dan · Feb 6, 2015

mikehaugen said:
A second flight may be a good idea, at the very least it will give you more ground contact on harder surfaces.... but how do you put it on now? :laughing:

Weld it all up, stretch it out, and then screw it on in between the existing one.

Rednic79 · Feb 6, 2015

hard to say what's better....pressure = force x area...less screws...more force / penetration of the ground, can be done if needed though

CNC Dan said:
Weld it all up, stretch it out, and then screw it on in between the existing one.

CNC Dan · Feb 6, 2015

Rednic79 said:
hard to say what's better....pressure = force x area...less screws...more force / penetration of the ground, can be done if needed though

Have to wait to try it out. If it sinks in too much and there is a lot of drag on the tubes, more flights may be in order.

Danno1 · Feb 7, 2015

chim said:
I'm guessing they wouldn't work very well for more than one reason. The most serious is ou'd need to find righ and left hand culverts. To travel, the pontoons need to rotate in opposite directions. Otherwise, the tractor will travel sideways.

The shipping costs would be a killer. You'd have to get one fr south of the equator!!

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Rednic79 · Feb 7, 2015

wahh wahhh wahh

Danno1 said:
The shipping costs would be a killer. You'd have to get one fr south of the equator!!

.

pappy60 · Feb 12, 2015

Great idea... going to watch how it goes... good luck...

Rednic79 · Feb 14, 2015

well, its running anyhow...any thoughts?

http://youtu.be/1uVcs_tzQ5I

pappy60 · Feb 14, 2015

Looked at the latest video #5

After looking at the Chrysler and Fordson (Posts 2 & 3) the spirals on them are really shallow... the spirals on yours would dig in and would take a lot more torque to turn them... maybe that is why the shaft bent...
What you made would be very difficult to turn.. you basically have two inclined planes pushing towards each other to provide forward motion, kind of like putting a block of wood between two gears... Think you are going to have to rework the spirals, maybe give them a less aggressive bite..

Hope you get it going, that would be a fun project.. and fun to drive also...
Good luck..

Rednic79 · Feb 14, 2015

yeah it's possible that they are too big, some of the other Russian screw vehicles have an aggressive spiral thought. i can cut them down if need be. it is misleading since i only have one helix not two. most on the other machines have at least two spirals, the fordson has multiple, and yes it is less aggressive. i think the gear setup wasn't strong enough either way....i need to either abort the spider gear setup, of make it much beefier.