Re: in lb torque wrench.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Sean the Nailer</div><div class="ubbcode-body">
Now, maybe there is someone here who has something new and insightful to add, which will part the seas and reverse the rotation of the earth so that the sun rises in the West.
(little humor there....)</div></div>
Ok, Sean, I will give it a try. When I was young, lots of instruments went in for calibration cycles and got tweaked. Now days, instruments are more likely to stay put and unaltered, and we have "check standards" that move around.
I bought this $20 inch pound torque wrench a couple weeks ago to put on some 10-32 scope mount screws with only three turns of engagement. I calculated the torque at the threshold of yeild for dry, lubed, and waxed threads and the verified those numbers by testing on some .1" thick steel.
http://www.snipershide.com/forum/ubbthre...390#Post2675390
http://www.harborfreight.com/1-4-quarter-inch-drive-click-stop-torque-wrench-2696.html
This a $20 inch pound torque wrench from Harbor freight.
I read the reviews, and some guy broke one after another and they did not work.
I went to the store and was playing with one, and was about to break it when someone pointed out that there is not sound, you have to see it toggle, and it does not toggle far.
http://en.wikipedia.org/wiki/Technical_standard
In this case the "primary standards" were:
Detecto medical beam scale 350 lb
Trimer mail scale 4 lb
Stanley Power Lock tape measure 25'
The "Check standards" were:
1 1/4" wrench that weighed 1 pound 14 ounces
1.5" diameter 9" long round stock steel weighed 4.5 lb
2.75" diameter 9.75" long round stock steel weighed 16 pounds
The distance was 10.75" and I weighed the rope too.
What does it all mean?
a) When I want to apply 20 inch pounds to my scope mounts screws, I had better set that wrench for 14 inch pounds.
b) Then I got all the accuracy needed for $20.