weissbinder

joined 2 weeks ago
[–] weissbinder@feddit.org 3 points 2 days ago (1 children)

I researched what kind of battery it was: CR2016, some kind of Lithium battery.

And boy, what a brain fart: I meant half a year, so six months. It's been a few years since I used that watch regularly, but I was impressed with the endurance of that little battery.

[–] weissbinder@feddit.org 4 points 2 days ago (3 children)

Skagen had these kinds of watches with their Hagen line. Ran on a standard battery for nearly half a month. You could set up notification groups so that the watch would buzz and the watch's hands point to a specific hour.

[–] weissbinder@feddit.org 1 points 3 days ago (1 children)

Wie versauen die Schokolade?

[–] weissbinder@feddit.org 11 points 3 days ago

In my experience, that concern is way outdated.

1
submitted 1 week ago* (last edited 1 week ago) by weissbinder@feddit.org to c/archery@lemmy.world
 

I want to build myself a spine tester to calculate the spine value of arrow shafts using the ASTM F2031 standard. I do know that I need a 880 gram weight and that I have to measure the amount of flex that the shaft produces when I hang said weight at the center of a 28 inch span off the shaft.

Well, but what then? I can measure the amount of deflection I have then but let's say the shaft is deflected by 1/12th of an inch or some millimetres. How do I calculate a spine value that ranges between 20 to 80 from that?

Can anybody give me a hint or solution?