Re: [CAD_CAM_EDM_DRO] Re: Problems in Timing Belt drive system in 6WD robot

I don't know for sure as I am have trouble picturing exact;y whats
happening there but you have one belt pulling forward and one pulling
backward. it would seem that both Belts have nearly dubble the load on
them. It also looks like if both sides are pulling forward at the same
speed each side has only half load on it??? If you lock one side the
other side has to pull the whole vehicle around with that one side being
pulled forward and at the same time while pivoting the other side is
being physically driven sideways on the forward section and the other
direction on the after section. I suspect the load on the pulling belt
might be two to three or four times as Great. One way or the other
turning increases the load on the belt seems to me. This is the
advantage of having steering wheels, it takes much less power making
turns. Doug

> John Dammyer wrote:
> > Hi John,
> >
> > I disagree. The principal of independent drive to both sides is used
> pretty
> > well all tracked vehicles. Just watch a dozer or tank turn in place with
> > one side turning one direction while the other side turns the other.
> > Control is often with two levers, one for each side, forward and
> backwards.
> >
> No, a dozer or tank has a strong tread that handles the slippage when
> turning. If you've
> ever seen a dozer turn in soft soil, it churns the ground mightily as it
> turns, due to
> the sideways slippage of the front and rear portions of the tread. They
> only
> drive the tread from the rear axle, the front is an idler.
>
> The problem with this vehicle is all left wheels, and all right wheels,
> are rigidly
> synched by the belt. When turning tightly, the middle wheels are closer
> to the
> center of the turn, and should not be turning as fast as the front and
> rear wheels.
> When turning on its center, the center wheels need to turn MUCH less
> than the
> outer ones.
> Why does this vehicle need six wheels? Try tying the suspension up with
> wires to unload the center two and see how it turns.
>
> Jon
>
>

--
Doug Pollard,
Sailor, Machinst, writer,artist
Visit me at:

http://sailboatsfairandfine.blogspot.com/




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