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Help-Tiny very simple spine tester

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El Destructo:
                            Thanks Justin.....works now.....Pat that is a pretty complex setup....but cool!!!

Pat B:
Mike, it is pretty simple. If I can build one anyone can.  The dial indicator cost about $10 - $15... everything was found. Here are a few pics of mine.

[attachment deleted by admin]

Pat B:
...well, I guess I did buy a few other parts. ;D

El Destructo:
                                                       OK.....so now I have another Project!!!!

                                                                              :P

JackCrafty:
I have a small bow 35lb at 20” and want small arrows (this time), so I’m thinking 30lb at 21”.  If I put 2 nails 20” apart, drawing a straight line between them, and measure from the mid point the downward deflection with a 1lbs weight, what distance will get me 35lbs?  What about 2 lbs?  I think 35lbs that would be the weight I want given that the extra inch will reduce my spine by 5lbs.  2lbs would be more accurate, but 1 would be safer on the light arrows.

Wolfsire, I know exactly what you are talking about.  I have the same issue with my short bows/arrows and the bows/arrows I make for my children.

The question seems simple enough.....but the answer is NOT.

First off, the existing charts were made by trial and error...hundreds, probably thousands of arrows were measured for spine to get the results seen on the charts.  In order to get you the info you need, an expert archer with a 35lb bow drawing 20" would need to spine several 21" arrows (at 1lb and also at 2lb) and then get the averages.

OK, you would now have your distance.  The trouble with just having the distance is that you need perfect arrows in order to spine them with just two nails, a weight, and a distance.  If your arrows are not perfectly straight, you would need to "zero" the center each time and then measure the distance.  If you have a way to adjust your little distance thingy, then you're fine.

Another thing is that the distance we are talking about is probably about a quarter inch (using a 1lb weight).  Even 1/32" of an inch at this distance could mean a significant difference in spine.  Eyeballing the distance would not be accurate enough.

I wish I had the type of chart you are looking for....I need one myself.  Since I haven't had the time to develop such a chart, I've had to get good at making arrows that fly well without the spine chart.  I've had to become an expert at "bareshafting" my arrows.

Hope this helps. ;D

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