@madgrizzle, looked at your Wiki post… Your contribution to the cause is extraordinary! Thanks.
I will respond as best I can to your question here, so as not to muddy the waters too much on the Wiki.
When I made my handbuilt sled, I mounted the ring and moved it flush to the top of the plywood, then measured from the center of the 1/4" center hole to the outer edge of the ring, getting 119mm. Looking at that diagram, I note that it has a measurement of 105mm to the inside of the ring. Just measured the width of the stock ring, and it is 15mm, I used an English Micrometer (really need to get a metric one!) and the distance from the outer edge of the ring to the end of the link being held by the cotter pin is dead on 9/16", or 14.29mm. Since I cannot check my outer ring measurement, I will go with the cool diagram, so:
spindle center to inside of ring 105mm + ring width 15mm + ring to end of first link 14.29mm = 134.29mm
Having read til I fell asleep your long tread on claibration
it appears that this value floats to try to fix other problems. Since I really do not know exactly how Maslow measures the rotational radius in relation to the chain connection point, I continued to ues the 140 mm value in my cal process. You will see that after the triangular routine, Maslow came up with a 136mm value.
Getting back to my situation (it’s all about me, right!) looking at my chart, aside from the general vertical problems, I fear that horizontal lines towards the top of the board will not be straight. What do you all think my next step should be?
Thanks!