Calculating torque output is contingent upon a variety of factors and it is
fiendishly difficult to get consistent and accurate readings all of the time.
Many multipliers and many firms claim plus or minus five percent accuracy. This statement itself is not accuate.
Internally, on all torque multipliers, there is the issue of internal friction of contact surfaces and tooth deflection under load.
Add to that whether it is being driven with a ratchet, a breaker bar or a torque wrench and whether that tool contacts precisely at ninety degrees.
Does the output drive utilize a shallow socket or a deep socket? Is the work being done at an obtuse angle where there is a hanging load?
Factor in all these questions and any predictions about torque output appear to be voodoo at best.
Yes, it is possible to have a very controlled test environment on a granite table in an air-conditioned laboratory.
Getting that same granite table underneath one's bulldozer with air-conditioning is another story.
That said, we know for a fact that at zero-load, our multiplication ratio is a given number- the same approximately as the gear ratio..
Similarly, we know with the addition of force, this ratio changes. We are able to measure with some consistency, the output ratio at full-load.
In between zero-load and full-load is a varying ratio. Closer to zero-load the ratio is better. Closer to full-load the numbers decrease.
This can be interpolated as a sliding scale to give some degree of intuitive accuracy sufficient for most applications.
If you are attaching landing gear to an aircraft or tightening bolts on a nuclear reactor, please buy one of those pricey units with precision needle and thrust bearings throughout.
Whether you are changing the cutting bar on your wheat combine or just adjusting your mother-in-law's dentures,
our devices, with attention to proper input procedures, produce reliable torque output numbers within acceptable tolerances using the ratios we have quoted on each device.