Forum Discussion
BenK
Jun 17, 2014Explorer
Haven't gone over to that link to read it, yet
Comments on the centering & head tilt
All WD 'using bars' systems have a 'centering' function. Some better
than others
Anderson does NOT have a centering function
The centering function is as noted in previous post with Gratz's
diagram
Where the differences are is in the chains or camms
With the chains, mean how the chains movements are controlled. The
Blue Ox's chain hookup setup captures or limits the chain movement
The 'L' brackets likewise and limits their movement the most
Head tilt used to be and still is, to gain more purchase on the bar
ends to pre-load the spring bars
Now this is where I've noticed with the Blue Ox setups...that also
applies to other WD spring bars with more head tilt
when the bars swing to either side, they swing 'up' to reduce the
amount of pre-load...but...by reducing the pre-load...they 'unbend'
to lengthen the bars a small amount. In both directions
Factor that with the different center axis between the ball and the
WD Bars will have one side push and the other side pull the tongue
back towards center
That effect is a bit greater with the bars get a bit longer with less
pre-load
Now the biggest factor is that the Blue Ox's chain latch up keeps or
limits the chain from swing to 'consume' the above centering forces
'L' brackets do NOT have this. They just use friction from what I can
see. Ask if their head is tilted or not?
Cam's also have this and also have the no chain to swing. Plus they
have an over center for the WD Bar end on the cam. They will resist
until enough force is there to move them off center of the cam
Understand what Andy Thomson writes, but not a fan of using monocoque
(unibody), front wheel drive TV's with WD Systems.
Comments on the centering & head tilt
All WD 'using bars' systems have a 'centering' function. Some better
than others
Anderson does NOT have a centering function
The centering function is as noted in previous post with Gratz's
diagram
Where the differences are is in the chains or camms
With the chains, mean how the chains movements are controlled. The
Blue Ox's chain hookup setup captures or limits the chain movement
The 'L' brackets likewise and limits their movement the most
Head tilt used to be and still is, to gain more purchase on the bar
ends to pre-load the spring bars
Now this is where I've noticed with the Blue Ox setups...that also
applies to other WD spring bars with more head tilt
when the bars swing to either side, they swing 'up' to reduce the
amount of pre-load...but...by reducing the pre-load...they 'unbend'
to lengthen the bars a small amount. In both directions
Factor that with the different center axis between the ball and the
WD Bars will have one side push and the other side pull the tongue
back towards center
That effect is a bit greater with the bars get a bit longer with less
pre-load
Now the biggest factor is that the Blue Ox's chain latch up keeps or
limits the chain from swing to 'consume' the above centering forces
'L' brackets do NOT have this. They just use friction from what I can
see. Ask if their head is tilted or not?
Cam's also have this and also have the no chain to swing. Plus they
have an over center for the WD Bar end on the cam. They will resist
until enough force is there to move them off center of the cam
Understand what Andy Thomson writes, but not a fan of using monocoque
(unibody), front wheel drive TV's with WD Systems.
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