Spine Tester Final Design

[Cupcake]

After further refinement based on input from several Tradgangers from Bear State Bow Hunters in So. Cal.  Here is my final spine tester design.

 

There are four interchangable scales that allow measurements from 20 to 200 pounds spine.  Here is a detail of the "Standard Scale" measuring a GT3555 Traditional.

 

Now the same arrow on the "Hybrid Scale".  This scale has ATA (AMO) spine on the inside and the deflection as measured by the aluminum and carbon manufacturers on the outside.  Notice that the arrow spines at 525.  I have others from the same dozen that spine at 500.  This scale allows reading in both measuring systems at the same time.

 

To measure light or heavy arrows a different weight is not required.  By changing the point that the arrow deflects the needle, and changing scales, these shafts can be spined.  The photo below shows the different pivot locations; move it left for light spine and right for heavy spine.

 

This last photo shows the machine set for heavy arrows measuring a GT7595, which happens to spine at 110 pounds.

 

Whaddaya think?
Kevin

[BamBooBender]

Awesome! When do they go into production?

[Artur]

Nice looking spine tester. I have one question, though:

If you do not know whether the shaft you are about to measure is "heavy" or "light", how do you decide which weight/scale/pivot point combination to use? Wouldn't using the wrong combination give incorrect results?

[SteveD]

Very Nice. Great Job

[TimZeigler]

Cupcake,  Now thats something I'd be willing to invest in for my own workshop, functional yet easy on the eyes.  Are you going to be selling these?  If so, sign me up.  Very nice job. Tim

[deertraks]

Very nice!

[Aeronut]

Looks good Kevin.

Dennis

[madness522]

That is about the best looking spine tester I ever layed eyes on.  Would it be possible for you to do a build-a-long on one of them?  This would be an excellent addition to any workshop!!

[Falk]

As already made clear in your original thread: I like your attention to detail!
Just great to have changeable scales and all! I guess, by now, this is the most versatile spine tester on the planet
           

[Cupcake]

Artur,

As long as you have the pivot point in the correct position for the scale you use you get the correct answer.

If the arrow is too light the pointer will just move off of the scale.  If the arrow is too heavy then the pointer will barely deflect on the light setting but the other two will give the correct answer.

The light scale goes 20-80lb., the standard 30-130lb. and the heavy 60-200lb.

Kevin

[Artur]

Next question.. Can you hang it on a wall? For those who have very limited work space....

Not trying to be difficult, just genuinely interested.

[Shakes.602]

Thats a  REALLY  Nice Tester!!     Did I hear Production for Selling to the Masses?      

[Cupcake]

Artur,

Yes it can be hung on the wall.  If you notice in the photos there is a large diameter hole toward the left side.  This hole is intended to hold the weight, in the center of the large hole there is also a one-half inch diameter hole to hang it on the wall.

Shakes.602,

Check the sponsor classified ads to learn how you to can own one.

Kevin