Rod Weighing Jig: Take 2
That is a cap from an old jar of interior trim putty LOL. Used it to try to spread the load and put some oil on the scale so it would slide around more easily and relieve any sideload on the scale. It's not needed now that the main contributor to the sideloading is resolved.
I had the same thought initially on the pivot being pointed. But I've found that these scales don't change their weight reading or accuracy if the load moves around on the scale surface; that is in the design of the scale, so the pivot being spread out does not change the weight. (Think of how big a rod is when laid directly on the scale.) The weighed end pivot ended up rounded just to help it slide around and not dig in be another source of sideload error.
I know is is looong and not an easy read, but it might become clearer to review the first thread. The plate is made in a way so that it is symmetical around its center along the long axis; this should make the plate have no effect on the Center of Gravity location of the rod. If that is done, then once the jig weight is zeroed out, then the rod's weight gets properly separated into each side of its CoG. I'm gonna make sure this is the case by weighing a set of SCAT rods and see if I get their same end weights. The big test!
Way to keep at it! Thanks for posting.
Thanks; wish I had seen this sooner. Like a lot of things... something shows up that you did not have any clue would be an issue, and you spend most of your time figuring that out. Makes one appreciate more the value in all this at shops and factories. I see videos on home made rod hanging setups and now wonder how good they are..... it depends so so much on having the right scale or understanding and solving this arcane issue.
Hope this is some use to those who want to develop their tools and home shop capabilities for little cost.
