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Thread: MG47 Jr.

  1. #201
    Gunco Member cntrailrider's Avatar
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    Received an email from Todd @ ORF today

    The AK Files Forums - OhioRapidfire is NOT COMING THROUGH

    Anyone know how old he is? 25-30? I have never met him

    Steve

  2. #202
    Gunco Member ghilliebear's Avatar
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    Quote Originally Posted by cntrailrider View Post
    Received an email from Todd @ ORF today

    The AK Files Forums - OhioRapidfire is NOT COMING THROUGH

    Anyone know how old he is? 25-30? I have never met him

    Steve
    sorry to hear that about your bf91..I hear you were a class 2 now is this right?
    Ghilliebear
    Us Army (Ret) INFANTRY.
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    IN WAR!


    www.prusikusa.com
    C2/SOT

  3. #203
    Gunco Member cntrailrider's Avatar
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    Nope. No applications here are being approved. They're being real sticklers about that. I've read so many horror stories about customers not being satisfied, that I don't even want the responsibility (post 197)

    I received a tracking # from ORF and it's being returned, unrepaired. They claimed in their emails that they've rewelded the broken cocking tube. We'll see.

    In my year and a half wait, I've since acquired a TIG & mill, and may try tackling it myself. Used a MIG (w/ no gas!) to build my 51 & 51K so I may be able to pull it off - maybe. It will be my first HK beltfed build experience, but I have the Vollmer '21 here, to study, and that will help

    Steve

  4. #204
    Gunco Member cntrailrider's Avatar
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    Default Rifle arrived today - works purrfect

    Rifle arrived and works purrfect
    Last edited by cntrailrider; 03-30-2009 at 03:41 AM.

  5. #205
    Gunsmith Fritz's Avatar
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    Good to hear all is well. I was worried for you and Todd. It is no fun to see people get screwed.

  6. #206
    SHARPSSHOOTER5090 SHARPSSHOOTER5090's Avatar
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    Steve
    Glade to hear that you got your rifle back and it works. Too bad you had to resort to what you posted to get satisfaction. One favor to ask, could you post some pictures of the H&K beltfeed system and how it works on a 91 please.

    Thanks

    Tom H.
    SS

  7. #207
    Gunco Member cntrailrider's Avatar
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    Thanks Guys -

    I'm so glad that ordeal is over, and had a happy ending. They really do possess the knowledge and ablilites to build great stuff

    Tom -

    The BF mech on the '91 is the same as a '21, with the only difference being the fixed barrel instead of quick-change. Unfortunately those units have skyrocketed in price IF YOU CAN FIND ONE!

    91BF


    Here's the '21. The BF "box" is the same in both




    You press a button to unlock the mechanism, and it slides out

    That little tit on the upper right is the feed lug, which engages the BC. The diagonal cam slot in the BC slides it side to side on the shaft. Very limited side-to-side travel, for producing all that pull on the belt. All the pull is accomplished on the back stroke (ratchet style). The 21E's are set up differently, and apparently use the fore AND aft stroke of the BC to operate the feed mech. I've never studied one. They are considered the Cadillacs of HK beltfeds, and the price tag reflects that too. Lots of excellent pictures (prices listed) on this link: HK Parts | HK21 HK21E HK23E



    Sorry its so dirty. Flash makes it look worse than it is



    The upper & lower plates inside the feed box are easily removable w/o tools, in seconds. You can see how critical the placement of the feed box is


    One thing I don't like about these is you can't pull empty links through, without great difficulty. So the first link in needs to be loaded (unless I'm missing something) They use German DM1 links, but backwards. I have starter tabs on both ends of every belt. Only $3 each from Robert. One end is for the MG47's / 7.62x39 going one way. The other end is for .308, going the other direction in HK's. I guess if you go far enough (meaning you've spent everything and are broke) things begin to come full circle lol

    Steve

  8. #208
    SHARPSSHOOTER5090 SHARPSSHOOTER5090's Avatar
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    Thanks for the pictures Steve. That's kind of how I figured it to look like. Could I ask you one more thing? What does the ratchet mechanism look like? And thanks for the compliment on the BP. The mistake I made on it was I built it on a standard thickness ES receiver except slightly shorter so it is way to heavy. I need to mill some lightening cuts into it and perhaps mill the internial corner angles away between the cap screws.

    Tom H.
    SS

  9. #209
    Gunco Member cntrailrider's Avatar
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    Tom -

    Just snapped these pics of the BF Mech, but am not going to disassemble the ratchet assy. Did that once and it took the rest of the day to get it back together. Everything is close-tolerance machined and a bit complex. I don't know the real names of these parts, so bear with me. I spoke with Ralph @ RDTS who is The Recognized Expert on HK beltfeds, and even he uses layman's terms like 'that tiny tab thing in there...' I'd like to have an exploded parts diagram, in English


    The 'rachet teeth' are in the middle black section beneath the large snap ring. The black plastic piece is a dust cover


    The feed stud slides on the shaft. The 'car' it slides on, has a lever/ear which engages the cogs. It only engages when moving INWARD (to the right, as pictured). It has a STRONG return spring


    Close-up of the shaft it slides on. Full travel is only 1/2"


    The floor of the feed tray, and feed sprockets which push the belt/links up towards the feed slot on top (more about that, below)


    Looking edge on; tension arm with a roller, which keeps the belt firmly in the feed sprocket teeth. It's loaded with a torsion spring. Length of up-travel determines how strongly your belt is held. The sprockets are on the same shaft as the ratchet cogs


    The tension arm. How high it travels is critical. At first, mine was too tight for a belt to even be pulled in. I bent it up almost perpindicular to the floor (to lengthen the stop & increase clearance for the belt) then put a section of roll pin on the ear to open it up even more. Those ears are known to break then you're screwed


    Here's the upper feed tray (or plate) with a spring-loaded cartridge guide. Single unit. The small square thing on the VERY BOTTOM is a spring-loaded thumb latch which locks it into position in the feed box


    Installed in the gun. The feed box holds the 3 components in the correct position, so they work together. Look at post # 207 above; pics 3, 4, 7 & 8


    Ah yes the 3rd component, unmentioned till now. It's the plate which goes in the bottom of the feed box (two gooved tits latch it into place) with tracks, so the feed mech can slide in/out for easy assy

    All the pieces are made from sheet metal stampings which are hardened. Super-compact design, cheap & fast to produce IF you have the tooling to make the stampings. Whoever engineered this was a genius

    As far as I know, individual replacement parts for the BF mech aren't sold. If something goes wrong, the whole unit is replaced at a cost of $2K+. Now you know why I don't want to take it apart!

    Whew

    Steve

  10. #210
    SHARPSSHOOTER5090 SHARPSSHOOTER5090's Avatar
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    Thanks a lot Steve for the extra pictures. Know I understand how it works. Very clever those Germans! I don't think I would take it apart either. I can see enough from your pictures to see what your describing. I might try making one for my FAL beltfeed

    Tom H.
    SS

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