Saturday, July 17, 2010

New arrow construction

Started putting my new compound carbons together this morning, which has NOTHING AT ALL to do with the fact that Calley has gone out shopping and doesn't know about them yet.

I decided to do a weight matching exercise to see how well matched I could get the batch.  Once the shafts were cut and deburred and the points cleaned, out came the grain scale.

Points (heaviest to lightest)
120.0

119.8
119.6
119.6
119.4
119.4
119.4
119.4
119.4
119.4
119.4
119.2
 
Shafts (lightest to heaviest)
247.6
247.6
247.8
247.8
247.8
248.0
248.0
248.2
248.2
248.4
248.4
248.4

So.... if we do some simple weight matching, this produces a combined point/shaft combination of:
367.2
367.4
367.4
367.4
367.4
367.4
367.6
367.6
367.6
367.6
367.8
367.8

That's 0.6gn variance across the batch, or +/-0.08% variance from average.  Quite happy with that.  I could dress a tiny bit off the ends of the heavier points to bring them in even closer, but since gluing in the points and fletching will introduce some further variations I will wait until then until final weight matching.

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