I went ahead and made another bee keeping contraption here at the this evening; this was pretty easy; I followed the example in this month's Bee Culture magazine for the same contraption.
I started with a 25 pound weight and then 55 pounds as shown. The torque reading at 55 pounds registered 33 foot-pounds. My preliminary findings are inconclusive in that the readings don't translate into real world weights...So at this point it is roughly a x2 factor.
I need to plot a graph with increasing weights to see if the device reads consistently linear.
If I knew more about the math and physics to calculate or predict the effect of shortening the angled iron or the position under the load it would save me time, trial and error producing a practical device we can use in the bee yard.
I suppose my goal is to translate ft. pound readings into kilograms or pounds so it would have more relevance to bee keepers but I guess I could record or measure relative weights in terms of torque wrench readings in ft pounds which would reflect an increase or decrease in the hive-real time.
I used 2 different torque wrenches and got similar readings. I wish the calibration was more conclusive. SORRY ABOUT THE PICTURES