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Main Boards => PowWow => Topic started by: Earl Jeff on December 13, 2009, 03:54:00 PM

Title: Spine/FOC. Tester
Post by: Earl Jeff on December 13, 2009, 03:54:00 PM
Posted some pics of a spine/FOC tester I was building a few weeks ago, thought I would post some finished pic's. (http://i567.photobucket.com/albums/ss115/earljeff/spinetester2003.jpg)
(http://i567.photobucket.com/albums/ss115/earljeff/spinetester2006.jpg)
Title: Re: Spine/FOC. Tester
Post by: Hot Hap on December 13, 2009, 08:22:00 PM
It looks very nice to me! Would like to see the FOC part in action. Hap
Title: Re: Spine/FOC. Tester
Post by: Earl Jeff on December 13, 2009, 09:14:00 PM
(http://i567.photobucket.com/albums/ss115/earljeff/spinetester2008.jpg)
(http://i567.photobucket.com/albums/ss115/earljeff/spinetester2013.jpg)
FOC in action Glynn nothing more than a balance point a tape measure and the math formula.
Title: Re: Spine/FOC. Tester
Post by: Old York on December 13, 2009, 10:40:00 PM
Earl, how do you zero out the dial indicator before lowering your weight?
Title: Re: Spine/FOC. Tester
Post by: Hot Hap on December 14, 2009, 11:35:00 AM
That is slick! Hap
Title: Re: Spine/FOC. Tester
Post by: Tom Leemans on December 14, 2009, 03:50:00 PM
Old York - The bezel on the gauge rotates and then you can lock it into position.
Title: Re: Spine/FOC. Tester
Post by: Earl Jeff on December 14, 2009, 04:02:00 PM
Thanks Tom.  It has to be adjustable for different dia. Arrows
Title: Re: Spine/FOC. Tester
Post by: Old York on December 14, 2009, 04:30:00 PM
I know the bezel can rotate, but one still needs to get the plunger
dial under the shaft with no pre-load    :banghead:  

I'll re-phrase my question - Earl, how is your jig adjustable for different diameter arrows?
How do you move the dial indicator up and down?
Title: Re: Spine/FOC. Tester
Post by: JEFF B on December 14, 2009, 04:33:00 PM
now that looks awesome!
Title: Re: Spine/FOC. Tester
Post by: Art B on December 14, 2009, 06:02:00 PM
Old York, on mine, I made my right post adjustable up/down/in/out to help zero everything up. Course, mine's not slick built like Earl's for sure. ART
Title: Re: Spine/FOC. Tester
Post by: Old York on December 14, 2009, 06:20:00 PM
Hi Art! HA! I know what you mean...that's
a nice piece of work Earl did with the copper piping and fittings.
Least that's what it looks like to me. Pretty dang clever he is   :D  

Mine looks like something from the Red Green School of Engineering,
but she's accurate. I learned how to null out the dial indicator influence,
thanks to your support!
Title: Re: Spine/FOC. Tester
Post by: Earl Jeff on December 17, 2009, 04:26:00 PM
I WOULD LIKE TO TAKE CREDIT FOR THE GREAT PIPE FITTING BUT IT WAS PART OF A OLD SCOOTER MY BOY DISGARDED, AT LEAST I HOPE HE DID.  :confused: