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Need help setting up my Oehler Chrono

Discussion in 'Reloading' started by XDRoX, Apr 28, 2010.


  1. XDRoX

    XDRoX
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    I recived this email from Oehler regarding my chrono questions:
    So the good news is I can buy anything I need from Oehler and they seem to be very helpful.

    The bad news is I don't understand these instructions:crying:

    I interpret this to mean that I have an option of how far apart to put the screens, but that can't be right can it? Isn't the exact distance between the screens what measures the speed? What am I missing?
     

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  2. GioaJack

    GioaJack
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    Conifer Jack

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    Chris:

    I read it to mean that for every 1000 fps of expected velocity you'll need to separate the screen by one foot. If you shooting mid .38's or .45's it looks like you can use just one foot spacing. I would imagine you'd probably want to go with the two foot spacing for your 9's.

    Also looks like your measurements are going to have to be pretty much dead on... only a 1/4 inch fudge factor with two foot spacing.

    Was nice of them to send you the information though. Good luck.

    Jack
     
  3. IndyGunFreak

    IndyGunFreak
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    KO Windows

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    Step 1. Shoot the power button to turn it on.

    ;)

    IGF
     
  4. GioaJack

    GioaJack
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    Conifer Jack

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    Even I'm not that cruel. :supergrin:

    Jack
     
  5. XDRoX

    XDRoX
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    Thanks for the responses. The bell is about to ring for 4th period and I have to teach 35 14 year olds the meaning of pi, how to find the circumf and area of a circle. I hope no one asks any velocity questions. I'll read your posts after school gets out.:supergrin:
     
  6. GioaJack

    GioaJack
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    Conifer Jack

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    Hell, I've known the meaning of 'pi' since I've been four years old... pumpkin, apple, blueberry, cherry, lemon meringue... they all mean the same thing... YUM, YUM. :pepper:

    Jack
     
  7. rg1

    rg1
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    Edited: didn't catch that it is a model 33 and not a 35P. If your unit only has two skyscreens and you don't get the start and stop skyscreens exactly spaced at 2ft or 4ft or whatever then you will get a false reading and not the exact velocity and you won't know it. Shorter spacing is easier to transport and set up, longer spacing more accurate.
    Learned something this spring about my 35P. Took it out and it wouldn't read and gave error messages or an unrealistic velocity reading. Found that if I slightly squeeze the plugged in cables that it would read but if I wiggled the plugs it would record a velocity or give and error. Called Oehler and they said to take a coarse cloth, leather, or similiar and polish the plugs (male plugs only) of the 3 skyscreens. (DON'T USE ANYTHING ABRASIVE). It worked and it hasn't missed a single shot since from pistol to big rifles. The plugs weren't corroded or anything but some oxidation or build-up that you couldn't even see must have taken place.
     
    #8 rg1, Apr 28, 2010
    Last edited: Apr 30, 2010
  8. kshutt

    kshutt
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    All that snow is making you delirious, Jack! :supergrin:
     
  9. GioaJack

    GioaJack
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    Conifer Jack

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    Snow finally melted today, most of it, with the help of 60 mph Chinook winds. Just came back in from letting the dog out... starting to rain, supposed to change over to snow by morning and be crummy through the weekend.

    I don't care! Going down the hill tomorrow to see about picking up a new Kimber. Leaving for Ft. Worth Saturday morning, if I get the Kimber I'll take it and a bunch of ammo with me and shoot it down there... IN SHORTS!!!

    Jack
     
  10. fredj338

    fredj338
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    I think XDrox has a 33. You'll want to use 24" spacing as a min. You can go to 48". Then the unit will have to be calibrated for the screen spacing. ASk Oehler how to do that.
     
  11. srd

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    Set your screens at EXACTLY 2 feet spacing on your bar, plug them in and go for it. At that spacing you can read up to 2,000 fps unless you play with hi speed projectiles and then space them at 4 to get 3,000 fps. I am assuming you have 2 screens unlike the 35p which has 3 for the proof channel. By the way congratulations on being a teacher !! Did my student teaching and found i didnt have the patience for it. Mine was HS automotive. Keep it up !!
     
  12. XDRoX

    XDRoX
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    Yes, so we are on the same page. This is what I didn't understand. If there is a way to tell the unit how far apart the screens are (which I figured there must be) then all makes sense. I just emailed Oehler with the question.

    Fred, if you have time can you click on the link Steve posted. It seems to have good info but I can't follow it.

    Thanks, I love it. Been doing it for 7 years and really enjoy it.
     
    #13 XDRoX, Apr 29, 2010
    Last edited: Apr 29, 2010
  13. XDRoX

    XDRoX
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    Wow, talk about quick service. They emailed the instruction manual within 10 minutes of my request.
    I'll start to look though it and post back.
     
  14. fredj338

    fredj338
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    Apparently there are switches, either externally or internally, flip them per instrctions & then mount youjr screens to exactly 24". A piece of CR tubing will work, drill the center & tap for a tripod mount.
     
  15. GLShooter

    GLShooter
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    I have an old Model 12. I set the screens at 4' and called it good. That will cover most of what I shoot except some real hot 20's.

    I now use a Millennium CED. It uses a 2' bar for spacing that can't change and will handle them all.

    Greg

    That Oeheler is super nice. Congrats. -- G.
     
  16. WiskyT

    WiskyT
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    pi times the radius squared for area and pi times the diameter for circumfrence. Now can I get some friggin' respect around here?
     
  17. GioaJack

    GioaJack
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    Conifer Jack

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    Looks like someone knows how to use Google. :whistling:

    Jack
     
  18. WiskyT

    WiskyT
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    Looks like someone knows how to hate:whistling:
     
  19. GioaJack

    GioaJack
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    Conifer Jack

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    Wisky, what'da ya mean hate... you're my little buddy. Us old guys gotta stick together. (I still don't believe you knew all that stuff without looking it up. :supergrin:)

    Jack