Building a pointer type spine tester

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Building a pointer type spine tester

artcher1
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artcher1
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Joined: May 30th, 2005, 2:39 am

July 27th, 2005, 1:22 pm #1

i6.photobucket.com/albums...er1001.jpg

i6.photobucket.com/albums...er1006.jpg

i6.photobucket.com/albums...art017.jpg

i6.photobucket.com/albums...art016.jpg

i6.photobucket.com/albums...art001.jpg

i6.photobucket.com/albums...art007.jpg

These types of testers are quick and easy to build and are just as accurate as the ones you pay big bucks for.

3/4" to 1" stock works fine for the base and all, but for the end post I would recommend 1/4" plywood.

I start with a 5"x 30" board for the base and I make the end post 5" wide and 6" high. But this height may vary due to you 2# weigth heigth. Your center post should be made so as to be adjustable at first. This will become apparent when you have to adjust your needle. Also, your right hand post will need to be adjustable to zero the needle for different diameter shafts.

Once you have your end post, center post, scale board and needle in place you can locate where your V notches need to be cut in by laying a straight shaft from end post to end post and mark them for the V notch. Allow a little daylight between your shaft and needle (finish nail) pin after the V notches are cut in and then secure the center post permanently.

Now to find you 50# mark. Place a straight shaft (any spined shaft will do) on your tester and depress exactly 1/2". Your needle will land right on 50#. Mark this spot on the scale board. Now take a sheet of drawing paper and temporary on your scale board and using your needle scribe a line from bottom to top. Remove and you're ready to lay at the scale chart.

Lay this out from 0 to 10". Then set your inch marks up in tenths. Divide 26" by 50# and you get .520 inch. Go to the 5" mark plus two tenths and this is the 50# mark on your chart. Now take you paper and align it's 50# mark up with the 50# mark you place earlier on the scale board. To get your other weights just divide 26 by your poundage. For example: 26 divided by 65# which equals .400 inch. This is the 4" mark on your chart.

Footnote: Tester shown in pic is slight different then the one in my drawing. It has roller bearing for the shaft and a stop at the nock end. And a few othe adjustments that the one in the drawing doesn't have. It' s a little harder to make and if this is your first one I suggest you go by the drawing. That's the way I make them now. But later you may want to add the rollers to keep the end post from marking your shafts.
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Time tourist
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Time tourist
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Joined: October 13th, 2005, 5:21 am

October 28th, 2005, 9:18 am #2

Hi Artcher1, I would be interested in building one, but apparently the pictures are gone. Could you post them again?
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artcher1
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artcher1
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Joined: May 30th, 2005, 2:39 am

October 28th, 2005, 2:42 pm #3

Try it now Time tourist.-ART
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Time tourist
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Time tourist
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Joined: October 13th, 2005, 5:21 am

November 9th, 2005, 4:46 pm #4

Thank you!
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Eli24
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Eli24
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Joined: March 25th, 2008, 12:44 am

March 25th, 2008, 12:44 am #5

I have been wanting one for quite a while. I have never seen one built like this one. I have a couple of questions. How can I produce an exact replica of the scale on the spine tester? How may degrees is each mark or major mark?

Eli
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Whitebeam
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Whitebeam
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Joined: August 6th, 2008, 7:39 pm

December 16th, 2008, 6:36 pm #6

Picture number 2 seems to have been deleted by Photobucket again :-(

It may be due to the missing picture, but there's a couple of points in this design that I'm guessing here ... particularly:

Weight of the weight (if you see what I mean) - I'm guessing from the text that this is 2lbs?
Position of the weight - halfway along the shaft?
I live not in myself, but become
Portion of that around me; and to me
High mountains are a feeling, but the hum
Of human cities, torture ... Byron
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NordicFletchr
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NordicFletchr
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Joined: October 2nd, 2008, 5:40 am

March 17th, 2009, 3:37 am #7

There is also the "2Jays" spine tester. Really good photos and how-to here:
http://paleoplanet69529.yuku.com/topic/24031
And the instructions and dial face can be found here (as well as other websites):
http://www.bambooarrow.com/tester.html (instructions)
http://www.bambooarrow.com/dialface.gif (dial face)

There are other spine testers out there, too, if you are willing to do a web search.
The only difference between a hero and a coward is the direction in which he runs. -- Proverb of the Mongol Horde

Men are not lost - they just take the long way. -- Red Green
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