|
|
Post by edge on Jan 16, 2009 8:35:36 GMT -5
OOOPPPSSS ;D I posted to the wrong Board  ;D Thanks to a member here, jeremylong, I came to realise that I can chronograph my loads after all! I have always thought of chronographing within yards of the muzzle, but I have a consistent light source at my target! The question is do I need diffusers shooting indoors. I am talking fluorescent lights, not incandescent lights. I never use them outdoors as I never go to an outdoor range at midday. Any thoughts, experience, ideas? edge. I have done some indoor crono work using my 45ACP. We also have fluorescent lights on our range and we have to use diffusers to get readings on the crono.
DC Edge, it has been my experience that fairly wide diffusers indoors with flurescent lights are usually a must. I watched a guy put his wifes white plastice cutting boards on top of his skyscreens one time.  I have a CED Mellinum II now and this thing just will flat out NOT work inside with flurescent lights. I can however use the IR Screens with brown paper sacks that are trimmed up over the top of the screen. I have gotten fairly good results this way. |
|
|
|
Post by jeremylong on Jan 16, 2009 9:10:34 GMT -5
Not sure how I helped but glad I could ;D
Yup - diffusers are a must for me too. I have also found that if I am struggling with the lighting, taking a black magic marker and coloring the bullets seem to help. Especially with the small center fires.
|
|
|
|
Post by edge on Jan 16, 2009 9:26:03 GMT -5
Not sure how I helped but glad I could ;D Yup - diffusers are a must for me too. I have also found that if I am struggling with the lighting, taking a black magic marker and coloring the bullets seem to help. Especially with the small center fires. In another thread you asked about my underground range, which happens to be dark at the muzzle but 100 yards away the target is lit up  It had not occurred to me to chronograph in the target house. edge. |
|
|
|
Post by bigmoose on Jan 16, 2009 9:57:02 GMT -5
Pro chrono sell an indoor lighting hood, works fine, but you have to remember your round will be lower at close range[ 15 ft] if you are using a scope sighted rifle.
|
|
|
|
Post by edge on Jan 16, 2009 10:02:07 GMT -5
Thanks, I assume that I'll just put the chrono about a foot in front of the target after firing a test shot. Once I know where the bullet will ( should ;D ) land it should be easy to get the height right.
I also like the idea of not worrying about the sabot hitting the unit too.
edge.
|
|
|
|
Post by jeremylong on Jan 16, 2009 10:49:13 GMT -5
Speaking of lighted shooting conditions, have you ever shot at your target with a big spotlight behind you? Its kinda crazy, you can see the bullet fly to the target.
Dont get the wrong ideas, i have done it at the 100yd mark to the big dirt birm behind my house.
|
|
|
|
Post by edge on Jan 16, 2009 11:52:19 GMT -5
I have never tried it but it sounds like it would be worth the look edge. |
|
|
|
Post by bigmoose on Jan 16, 2009 12:09:51 GMT -5
Edge,
Not being the bright bulb, the hood is make out of cardboard, it holds a long bulb over the sensor's, at 12 to 15 feet, the rifle produces a shock ware that vibrates the unit,, again not being overly bright, I decided to fire a shot just over the top of chrono, forgetting about the 1 1/2 between the height of the scope to the muzzle. the chrono came out second. But like a timex watch it is still ticking ;D
|
|
|
|
Post by bigmoose on Jan 16, 2009 12:19:39 GMT -5
In case anyone is wondering how the chrono survived a 300gr Barnes X bullet pushed by 70gr. of H4198, Shooting offhand at a downward angle the bullet hit the very rear of the sabot guard I made, blow it to pieces cut a grove in the chrono, but didn't hurt its operation. The boy genius strikes again,.........Boy, I don't think so the Brain dead old man strikes again
|
|
|
|
Post by edge on Jan 16, 2009 12:29:21 GMT -5
Only one shot? Didn't you want to give it another try just in case hitting it the first time was a fluke ;D
edge.
|
|
|
|
Post by jeremylong on Jan 16, 2009 12:38:27 GMT -5
Bigmoose that reminds me of when I was younger trying to shoot some birds off a fence. Well, I was at moms house and just cracked open the sliding doors to the deck and bared down on a couple birds sitting on the fence across the deck. I shot all 10 rounds at the dang bird and never even made it fly off. I went for more shells, and came back and noticed the top rail of the wooden deck grooved/splintered to heck. That rail was evidently just slightly below the sight plane. Tough time explaining that one. |
|
|
|
Post by jeremylong on Jan 16, 2009 12:41:15 GMT -5
Edge - It looks like tracer rounds. The light reflects off the base of the bullet. If you have a safe spot, its entertaining.
|
|
|
|
Post by bigmoose on Jan 16, 2009 12:53:16 GMT -5
jeremylong,
You made me feel better, we ought to start a club.............
|
|
|
|
Post by bigmoose on Jan 16, 2009 12:55:54 GMT -5
Edge,
For your infomation, I hit it two out of three time......put that in your pipe and smoke it.
Lets see you equal that.
signed,
deadeye
|
|
|
|
Post by bowbender6 on Jan 16, 2009 14:07:52 GMT -5
I made a permanent lighting fixture for my pro chrono using 2- 40watt appliance bulbs (long tubular bulbs) attached to a sheet of plywood with slits cut in it, which I covered with ¼” Plexiglas and put a little roof over it. This works for my shooting bench outside my basement but if it wasn’t permanent it would work indoors too. I had varying reading depending on the sun and cloud cover. This works the same in all conditions. I can post pics if anyone is interested.
|
|
|
|
Post by edge on Jan 16, 2009 14:13:58 GMT -5
Thanks, I would like to see pictures edge. |
|
|
|
Post by bowbender6 on Jan 16, 2009 14:21:09 GMT -5
I will try to get some this weekend if it warms up. -30 windchill here right now. I think I have some pics on photobucket but it is blocked here at the school.  i can't tell if this worked untill I get homebecaused some pics are blocked. I can get some better pics this weekend of the lights |
|
|
|
Post by bowbender6 on Jan 17, 2009 12:50:13 GMT -5
Here is a diagram of the light fixture. I tried different bulbs and led lights but the 40-60 watt bulbs seemed to work the best. You need an appliance bulb or rough service type as the muzzle blast will jar the filament and it will burn out. I cut slits in the plywood the same distance as the sensor opening on the chronograph. I put a piece of Plexiglas over the slits and put a light coat of white spray paint to make the openings translucent. I think the fluorescent lights have to much electrical noise to work reliably with the two chronographs I have had.  |
|
|
|
Post by edge on Jan 17, 2009 12:56:13 GMT -5
Very nice setup you have there, and you can't beat it for convenience edge. |
|
|
|
Post by craigf on Jan 17, 2009 13:48:52 GMT -5
Tips and Hints section canidit?
|
|
I have done some indoor crono work using my 45ACP. We also have fluorescent lights on our range and we have to use diffusers to get readings on the crono.
Edge, it has been my experience that fairly wide diffusers indoors with flurescent lights are usually a must. I watched a guy put his wifes white plastice cutting boards on top of his skyscreens one time. 
;D
I have a CED Mellinum II now and this thing just will flat out NOT work inside with flurescent lights. I can however use the IR Screens with brown paper sacks that are trimmed up over the top of the screen. I have gotten fairly good results this way.
