PDA

View Full Version : Steering on Cart



ligito
05-18-2009, 12:12 AM
http://s267.photobucket.com/albums/ii319/ligito/I made a cart and just road tested it.
The handle steers the wheels in the wrong direction.

What do I need to do to correct it?

CCWKen
05-18-2009, 12:20 AM
Move the steering rods to in front of the handle pivot or move the steering arms to the rear of the wheels. (Swap left and right spindles.)

This is just a guess since you didn't describe your cart or it's steering mechanics. :rolleyes:

ligito
05-18-2009, 12:21 AM
I am attempting to post pictures.http://s267.photobucket.com/albums/ii319/ligito/


My pivot is in the front, the handle is in the front and the steering rods are in the back.
Do I need to change the pivot to the back and put the handle in the front?

ligito
05-18-2009, 12:30 AM
http://i267.photobucket.com/albums/ii319/ligito/P5120316.jpg

CCWKen
05-18-2009, 12:50 AM
http://img.photobucket.com/albums/0903/CCWKen/Displays/CartSteering.jpg

A.K. Boomer
05-18-2009, 12:57 AM
Ligito -- you did not discover this on the test drive --- nobody discovers that their steering mechanism that they just built works in reverse on the test drive --- Do they?:eek:

CCWKen
05-18-2009, 01:04 AM
Move your pivot point to where the steering rods are now (or back as far as you can) and turn the pitman 180*. You will probably have to lengthen your steering rods a little.

It doesn't look like you can move the steering arms to the rear of the spindle because of the frame. That would take a major change.

CCWKen
05-18-2009, 01:27 AM
My first diagram is what is called rear-steer. Your setup is what's called front-steer. You'll have something like this.

http://img.photobucket.com/albums/0903/CCWKen/Displays/CartSteering-x.jpg

ligito
05-18-2009, 08:12 AM
Ligito -- you did not discover this on the test drive --- nobody discovers that their steering mechanism that they just built works in reverse on the test drive --- Do they?:eek:

I sure did.:(


This picture show it with the handle installed.
My steering rods are not adjustable.
If I turn the Pitman around and pivot from the back, with the handle in the front, will that do it?

http://i267.photobucket.com/albums/ii319/ligito/P5170327.jpg

Peter.
05-18-2009, 08:24 AM
All you gotta do is take the rods off and turn the quadrant round 180degrees, then re-fit the rods. By the way have you tried opening the drawers yet? :)

A.K. Boomer
05-18-2009, 09:26 AM
I sure did.:(


This picture show it with the handle installed.
My steering rods are not adjustable.
If I turn the Pitman around and pivot from the back, with the handle in the front, will that do it?

http://i267.photobucket.com/albums/ii319/ligito/P5170327.jpg


Ohhh that kind of a cart, Not as critical as I thought:p

Peter just gave a good suggestion but funny things happen with steering geometry along the way -- you may get the right direction correct by doing this but it can get progressive on one side and regressive on the other which will leave the wheels fighting each other real quick even though they are aligned good in a straight line -- In fact it looks as if you might have a little of that already going on in your pic?

Edit; I think your saying the same thing with pivoting the pitman arm at the back, what you will need to do is mount the pivot way towards the cart so you don't have to change the length of the steering rods that you already built -- it looks like the handle will clear the rods for the most part?

A.K. Boomer
05-18-2009, 09:55 AM
My pivot is in the front, the handle is in the front and the steering rods are in the back.
Do I need to change the pivot to the back and put the handle in the front?


Sorry -- i just read this from your earlier post -- yes you already have the answer, I think I would build a new fulcrum plate or cut everything off but the pivot then switch the handle mount around with the steering rod mounts and mount pivot for plate towards the cart -------- You really need to get one thing right here, experiment with where to mount the main pivot on the fulcrum plate to get the correct ratio as you have an extra worry to consider with your unit - it doesn't just steer and that's it - your front handle folds down while you pull and you want the cart to follow so the ratio at which your tires align with the handle in its horizontal position is key or else you will be fighting your cart just trying to pull it, Experiment where to put the pivot while the handle is lowered and by looking at the tires - do this at max turn angle and then straight and you should be good - use something long and flat along the side of the tires and it should align with the pull handle - that's actually a nice looking cart and I think your doing a good job -- caught by one of those damn "technicality" issues but you'll get er...

ligito
05-18-2009, 11:31 AM
Thanks for the help.
More work to follow.

barts
05-18-2009, 11:43 AM
Don't forget the Ackerman:

http://en.wikipedia.org/wiki/Ackermann_steering_geometry

- Bart

Your Old Dog
05-18-2009, 12:59 PM
Turn your seat around. :D

ligito
05-18-2009, 01:43 PM
Turn your seat around. :D

Then the zipper would be too hard to reach.:D :D

ligito
05-18-2009, 01:48 PM
The entire axle assembly and steering came from a John Deere riding mower.
I forgot to measure the centers between the steering shaft and the Pitman before I got rid of the mower.

I wonder if I got the steering shaft and mounted it behind the pitman and attached the handle to the steering gear, if that would be any better.

I know where to find a shaft. I have to remove it, so I could measure everything then, if that will work.

ligito
05-18-2009, 08:50 PM
I made a new bracket and turned the steering sector around, now it works.