Re: Box tubing inconsistenies for WCDs
 

David,

The brand should be Knipex, we own the same set of snap ring pliers. Also got the 90 degree ones.

They were recommended to us by the cows (1538) and we are very very happy with the quality of the pliers.

-RC

Re: Box tubing inconsistenies for WCDs
 

I was about to suggest Knipex too. :D

Re: Box tubing inconsistenies for WCDs
 

I've been playing with those blocks, and just wondering how the ones in the slots are kept in place. Do they just float in the middle somewhere held by chain tension? That seems really weird. I don't see how you lock them down in your CAD.

EDIT: Now that I look at it, its only 3/8ths of wiggle. So it might not be as big as an issue as I think.

Re: Box tubing inconsistenies for WCDs
 

When the blocks are loose, a chain tensioner pulls them against a fully taught chain.

This position is locked in when the faceplates are tightened.

If a WCD drive bearing block doesn't clamp the frame, it will not work well. This rigidity is key

Re: Box tubing inconsistenies for WCDs
 

Im not entirely sure what you mean by the first bit. But it sounds like you'd have them loose when you're putting the chains in and slide them around to get your tension, then tighten them down. Your first sentence made it sound like there is another tensioner somewhere, though.

Re: Box tubing inconsistenies for WCDs
 

This other tensioner is most often a cam mounted inside the tubing that can be rotated to adjust the position of the bearing block along the length of the slot, and thereby properly tension the chain when the bearing blocks are loose. Then the bearing blocks are tightened in place to help maintain their position until they need to be adjusted again.

Re: Box tubing inconsistenies for WCDs
 

If memory serves, the tensioners are missing from some of 973's CAD files. Download the most recent one from Hurricane and you'll see the tensioners.