Dual Cam Setup
I'm working on setting up a new Reese Dual Cam setup. I think I need a 1" extended ball, and wonder if I would benefit from a 2". Here's are some photos of where I'm at now: Side view, I think...
Forum Discussion
mrekim wrote:That's one of the details I hope to get properly documented later today.
As the turn starts, the inside bar needs to ride up the cam before it unloads. It seems like this would have the effect of tightening the chain some.
From the chart, it looks like the reduced slope of the inside bar load line from 0 to -10 degrees may be due to this riding up effect. If that's the case, hopefully you can describe why it initially decreases slowly rather than increasing a little first.
Yes, the inside bar does ride up the cam before it unloads.
I assumed the front slope of the bar detent is the same as the rear (although it appears to be less).
From John's data, the rear slope produced bar lift of about 0.04" per degree of turn for small angles -- corresponding to a bar load increase of about 12# per degree.
John also has provided data which shows the effective rearward tilt of the WD bar trunnion changes with turn angle.
For the inside bar, the trunnion tilt effect will cause the bar to unload at a rate of about 24# per degree of turn as the trailer begins to turn.
The cam rise effect of plus 12# per degree and the trunnion tilt effect of minus 24# per degree gives an initial net effect of about minus 12# per degree of turn.
As the turn angle increases (becomes more negative on my chart), the cam rise effect reaches a maximum and then decreases slightly, while the trunnion effect continues to unload the bar at a rate which increases as the TV/TT angle increases.
For my example, the trunnion effect causes the inside bar to completely unload at a turn angle of about -34 degrees.
Ron
