I am looking at building my own spine tester.
How far apart should I make the blocks? 26" or 28"
What weight is correct for each span distance?
What is the formula for converting a digital reading to poundage? (.500 + ?#)
Thanks,
Do a google search. There's quite a few good builds out there.
I think there may be one in our "how to" section take a peek there. Either way to answer your question.
26" and 2#
I got the answer on another sight. Based on the calculation equasion, the 26" span and 2# weight is the way to go.
The 28" span and 1.94# requires constant reference to a chart as the math is not as neat and I have yet to identify the required constant.
I built mine into the edge of a shelf over one of my workbenchs with two dowels 26" apart and a 2# weight.
(http://img.photobucket.com/albums/v169/Stumpkiller/Bowhunting/HPIM2043.jpg)
(http://img.photobucket.com/albums/v169/Stumpkiller/Bowhunting/HPIM2040.jpg)
(http://img.photobucket.com/albums/v169/Stumpkiller/Bowhunting/HPIM2047.jpg)
Rose City has a chart you can download with the AMO deflections.
(http://img.photobucket.com/albums/v169/Stumpkiller/Bowhunting/AMOSpineDeflectionChart_zps19c2c59e.jpg)
The chart above is the easy way to go to convert deflection to spine. The formula is: 26 divided by the deflection in inches = spine. Example, 26/.500=52#
Stumpkiller,
Cool idea!!! I may have to steal that one and call it my own!
Nice set up.
Good info thanks for the post