chrony... how do they work

fogducker

fogducker

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like the topic says....i have a rough idea what they do and how they they work:redface: can i get some info on the real stories of these?,...also how often do you put a hole in them:eek:
 
You generally have 2 windows to shoot through. The first one turns on the clock and the second one turns off the clock. After a series of calculations, the velocity is displayed.

Simplified yes, that's all it is.


"also how often do you put a hole in them?"

Depends how bad a shot you are at 10 feet.

RePete.
 
i thought they would closer then 10 feet....but then again if i knew it all ..i would not be asking...thank,s repete:) damm im learning new stuff here daily:cool:
 
The next chrono that gets shot will not be the first, at 10 feet or even 2 feet.

Perhaps this is why one brand calls itself .... (drum roll) .... Shooting Chrony!

Sorry.
 
I didn't shoot my directly. I shot a poured bullet with a gas check. The gas check smashed into the display, on the first day of use. I now have a piece of 1/2" Lexan in front of the display.
 
closer than 10' leads to some problems with muzzle blast

basically add 5-10 fps to the chronographed speed, for the true muzzle velocity

I couldnt imagine handloading without one now that I got one
​
 
I know a guy that's shot two chronys :eek: Mind you he claims that they used to replace them under warranty with pretty easy going standards..

The thing to do is set up your bench, your target and your chrony in that order. Make sure the chrony's in the right spot.
 
I set it up six or eight feet from the bench on a tripod.I use a target for shooting groups. Always look down the bore,don't rely on the lowest setting of the scope.
 
I'll be honest and say their are at least three graze marks on mine. The worst was the time I wasn't watching and had the wires that connect the two eyes laying over the hinged part of my Chrony and blew them all off.
Duh, maybe compensate for the bore being 1 1/2" lower than the line of sight, pylon! At least I learned the lesson before I really did some unrepairable damage.
Does anyone else here have grief getting theirs to read unless they are in a perfect light situation. Even with a brand new battery and out at 18-20 feet from the muzzle I have a hard time with errors. Like I said before, I have grazed it but there is no way those eyes could be damages from the little marks I have left behind.

Noel
 
I have an older F1 chrony.
It has the dense carboard ends and light plastic reflectors.There are arrows you use as reference points to shoot through at a certain height.If you shoot higher in the window than the arrows indicate the speed increases.It is always close to the book speeds for different loads,I just can't figure why the speed increases with height changes.RB
 
The principle that a chronograph works on is very simple. At each end where the screens are located is a photocell. The bullet or object passing over the photocell causes a momentary change in light intensity. The time the object takes to pass from one photocell to the other in measured in the chronograph. This time is then calculated as the speed in fps or mps. The screens are only there to enable the photocells to more easily detect the object's passage over the photocell. On very cloudy days you don't need to use the screens with some chronographs.
 
I nicked one of the rods on a buddy of mines. I had never shot over a chrony before and there was not a target behind it. I was shooting a handgun without a rest.
 
I could have demonstrated mine to you last weekend.
If I'd known, I'd have brought it.
Smaller cals, ten feet or less is fine, heavy loads, and big bores, need more space, or the chrony will give you an error message. 45-70 heavy loads, damn near blow the chrony down range. 15 feet is a must.
 
fogducker said:
any one that ever shot there chrony? did you laugh it off or curse your guts out?:p
Click to expand...

The first time I nicked it was with my 375 H&H, no rest.
It swung around on the post it was bolted down to and the back screen went flying.
Nugget was with me that day, we always have a good laugh!:p Between the two of us something more than likely will go awry before we go home.
If you get mad doing what you love the most it ain't no fun. I was frustrated for sure when I snipped the wires since I had alot more loads to test but that just means you get to go out shooting again real soon!:D
Noel

Also, in regards to mine not always working, it is worse on over cast days. I was thinking of making larger reflectors. Will let you know if I fix it.
 
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