777 HAUL TRUCK (1/12 size)

[DADSGARAGE]

Originally Posted by modelman

DADSGARAGE-you are doing some great work on this build. I have enjoyed watching your progress. A bit more on the akerman steering (if you care) I think for proper akerman geometry with both front wheels pointed straight forward, the steering arms should be aligned with the center of the rear axle. Here is a neat diagram that shows how it works.
http://quaxio.com/steering/. Keep up the good work!!!

Thanks for the info, getting the steering geomerty right is a tricky thing and challenging...mine will not be exactly right but it will be close"ish".. I found this picture of a truck standing on it's tail...interesting veiw of the steering


[IMG][/IMG]

[Espeefan]

Originally Posted by DADSGARAGE

Thanks for the info, getting the steering geomerty right is a tricky thing and challenging...mine will not be exactly right but it will be close"ish".. I found this picture of a truck standing on it's tail...interesting veiw of the steering


[IMG][/IMG]

That is a very interesting photo! In all honesty, your steering set-up looks like a very good facsimile of the 1:1 trucks! Makes me wonder if they have the proper ackerman effect or not? It could be that the 1:1 truck's links to the knuckles are longer, reducing the parallelism problems encountered in small scale, and the travel arc of the center arm may be less, if it's pivot point is further back from the bolts that secure the steering links?

[JAMMER]

I was wondering if you took the two tie rods at the center pivot point and swapped them so that they would be close to the center pivot point if that would work better. Ed

[doodlebug]

Originally Posted by JAMMER

I was wondering if you took the two tie rods at the center pivot point and swapped them so that they would be close to the center pivot point if that would work better. Ed

That's what Cat called "sprunion" steering on there forklifts,
If I remember correctly?
Cheers, Neil.

[RCP57]

I say call it good enough on the steering, finish the truck, and get on with the shovel already...