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Jig for ballancing Con. Rods.
#1
Every time the subject of con. rod ballancing crops up I think I aught to dig out the rig that I made years ago, and put it on the forum. This time, prompted be Geoff Halstead's post, I finally got round to it.
I can't claim the credit for this idea, as I read it somewhere, and I can't remember where.
I hope the pictures will be fairly exlpanatory, but basicly the lightest rod is on a carrier that is suspended by two tension springs that can be adjusted for height untill the rod is exactly horizontal, and in line with a datum line on the main frame. Susequent rods are then put on the holder, and metal removed until they all match the first.

[attachment=12501
Genaral view of the rig with lightest rod in place.

PC210004.JPG (2.27 MB)
The adjusting screws to get things level.

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The lightest rod levelled up.
 
PC210003.JPG (1.09 MB)
Metal must be removed from this rod until the pointers are on the datum line again.

Notes. Long weak springs will give a more sensertive reading than short strong ones. 
It should be posible to make a universal holder for any rods. I didn't bother, these are OHV reliant rods.
The rods ilustrated were well balanced anyway, so for the sake of the illustration I put short bolts in the "light" rod. 

I found the time involved making this saved a lot of faffing about trying to weigh one end of a rod at a time, and the rusulting ballance was very good indeed.

Cliff.


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#2
Great idea! No scales or calculations involved.
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#3
I really like this - very clever!
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