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Thread: Ess arca-adaptor problem

  1. #1
    CGN Ultra frequent flyer *MALICE*'s Avatar
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    Ess arca-adaptor problem

    Ok, picked up one of the arca rail forend adaptors for my ESS chassis from MDT.

    Included with the rail are 3 screws with which to screw the rail to the chassis, as well as two smaller screws, which I assume you can use to screw things to the small tapped holes running along the rail.

    Problem, the 2 smaller screws don't actually thread into the small tapped holes. Disclaimer, I'm a machinist, so while I appreciate that doesn't mean I'm not an idiot........I do know how to screw something into a threaded hole

    Edited -

    It appears that the tapped holes are either a much finer pitch, or they are cross threaded (leaning towards this), but they are definitely not 6-32* . Sigh.


    Anyone run into this? these holes were tapped in a cnc machine.......so if my rail is bad....there must be other bad ones out there




    *corrected from 10-24
    Last edited by *MALICE*; 12-06-2020 at 07:55 PM.

  2. #2
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    Did you call/email MDT? I’ve found them exceedingly helpful.
    Semper Fi

  3. #3
    CGN Ultra frequent flyer *MALICE*'s Avatar
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    Ya, I've sent them an email.

    I know they'll fix the problem.

    Just a little disappointing. I seem to have bad luck with MDT products

  4. #4
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    Some of the hardware with my ACC was extra, probably for slightly different applications. I don’t have an ESS or Arca adapter though.
    Semper Fi

  5. #5
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    Something just occurred to me; my ACC Arca rail has what I think is a stopper screw to keep things from sliding right off. I would have to look again but there might be several holes to limit movement of an accessory once you loosen it up.
    Semper Fi

  6. #6
    CGN Ultra frequent flyer rugbydave's Avatar
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    The threaded holes in the "arca" rail (it's actually built to RRS' dovetail spec) are supposed to be threaded 6-32. They're so you can put small stopper bolts in their so you can butt them up to whatever you are clipping on there (tripod, bipod, etc) so it can't slide under recoil.

  7. #7
    CGN Ultra frequent flyer *MALICE*'s Avatar
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    Quote Originally Posted by rugbydave View Post
    The threaded holes in the "arca" rail (it's actually built to RRS' dovetail spec) are supposed to be threaded 6-32. They're so you can put small stopper bolts in their so you can butt them up to whatever you are clipping on there (tripod, bipod, etc) so it can't slide under recoil.
    got calipers out. The screws are 6-48, but the holes appear cross threaded.

    I got one of the screws to thread into a couple holes, but you could feel it wasn't right

    Anywho, we'll see what MDT says

  8. #8
    CGN Ultra frequent flyer btabin's Avatar
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    Quote Originally Posted by *MALICE* View Post
    Ya, I've sent them an email.

    I know they'll fix the problem.

    Just a little disappointing. I seem to have bad luck with MDT products
    You can't bat 100 all the time. The important thing is how they handle it. My favourite companies to deal with are the ones where something has gone wrong and they've gone above and beyond in trying to rectify it.
    I suck at responding to PMs. Don't take it personally.

  9. #9
    CGN Ultra frequent flyer *MALICE*'s Avatar
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    Quote Originally Posted by btabin View Post
    You can't bat 100 all the time. The important thing is how they handle it.
    I can't seem to bat 100 ANY of the time

  10. #10
    Business Member TAC21's Avatar
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    Please send us an e-mail and we will happy to look into this for you. It sounds like the wrong screws were sent by mistake, should be a super simple fix!
    Modular Driven Technologies Corp (MDT)
    Website: https://mdttac.com
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