HK flat bending jig?

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  • KIBarrister

    Opinionated Libertarian
    MDS Supporter
    Apr 10, 2013
    3,502
    Kent Island/Centreville
    I know these are available on HKparts and RobertRTG (although usually OOS at the latter). I have a 20 ton shop press I am finishing building now so I don't need a work around to needing one of those. I was hoping I could find a lightly used version of these, but try as I might they seem to be unobtainium other than buying new at a minimum of $450~.

    What about the homemade versions? Has anyone used any of these (for those that don't like clicking links, photos of each, in the same order are below):

    https://grabcad.com/library/mp5-bending-bending-jig-1#!

    https://grabcad.com/library/hk-flat-bending-jig-1

    Also, there is a 3D print version that at least a few people have reported works well:

    https://www.thingiverse.com/thing:4614385

    (bonus points for anyone who has done these flats about whether the other jigs available from HKparts and/or RobertRTG are necessary (mag/shelf locater barrel press, etc.)

    (more bonus points if anyone has similar suggestions and first hand experience with the same for Klashnikovs, but I am primarily concerned with the HK variety)
     

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    FrankOceanXray

    Active Member
    Oct 29, 2008
    11,831
    I folded mine prior to the 2013 legislation passing. Is this still a concern? Also, I still have it in just that form. Who will weld and build for you? These are one of my favorite looking rifles.
     

    wbw2123

    Member
    Nov 19, 2012
    824
    I have used the hk parts flat bending jig with another forum member and it made short precise work, no need for a mandrel afterward. I don't have one or of offer but I would definitely recommend it. I do have the long production style RTG weld jig that you are welcome to borrow.
     

    KIBarrister

    Opinionated Libertarian
    MDS Supporter
    Apr 10, 2013
    3,502
    Kent Island/Centreville
    I folded mine prior to the 2013 legislation passing. Is this still a concern? Also, I still have it in just that form. Who will weld and build for you? These are one of my favorite looking rifles.

    certain configurations of most HK products are still Kosher (e.g. pistols). I'm planning to do the whole thing myself from bang to buck. :party29: This is far more than an Armalite (and perhaps more than a 19/2011, though far different).

    I sent you a PM .

    cheers!

    I have used the hk parts flat bending jig with another forum member and it made short precise work, no need for a mandrel afterward. I don't have one or of offer but I would definitely recommend it. I do have the long production style RTG weld jig that you are welcome to borrow.

    That is what I keep coming back to. The few reports from the 3D print part report the same results, but with flats costing $225 - and the reality that they will probably be impossible to replace in about a month - I am hesitant to cheap out based on an anonymous random comment (or three) from the internet.
     

    MaicoBill

    Member
    MDS Supporter
    Aug 17, 2020
    215
    Here is some inspiration. This wasn't built from a flat tho.
     

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    GunBum

    Member
    Feb 21, 2018
    753
    SW Missouri
    :thumbsup:

    I’ve looked over there on past threads and the usual response I’ve seen is “go ask on weapons guild.” But I have high hopes for MDS coming through like always :)

    “Holescreek” is the guy you need to ask, but he quit weapons guild a couple years ago. Without him there, you are getting second or third hand knowledge.
     

    teratos

    My hair is amazing
    MDS Supporter
    Jan 22, 2009
    48,757
    Bel Air
    A friend is printing me one now.
    I can drop it in the mail, if you want.
    I’ll need to get an MP5 flat. Lol.
     

    Rockzilla

    Active Member
    Feb 6, 2010
    3,934
    55.751244 / 37.618423
    “Holescreek” is the guy you need to ask, but he quit weapons guild a couple years ago. Without him there, you are getting second or third hand knowledge.

    ^^ This there are several "how to's on there" HK's are fun to build,
    Parts Kits are Hit n Miss, Prefer The MP5 Kits use the LSC "Flats" with
    Weld Kit, got the JIgs, a Friend made some (metal) don't have the Tig
    Welder anymore (access to) my stuff is boxed up waiting patiently for
    the move, same old line they ain't an AR (assemble) vs. Build.The 91's
    are also fun to build / 1911's / AK's / and others.
    "Jig-man" picked them up over the years.

    Jigs ain't cheap, nor the Flats. well ain't nothing cheap anymore
    good kits are crazy price wise...

    -Rock
     
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    KIBarrister

    Opinionated Libertarian
    MDS Supporter
    Apr 10, 2013
    3,502
    Kent Island/Centreville
    “Holescreek” is the guy you need to ask, but he quit weapons guild a couple years ago. Without him there, you are getting second or third hand knowledge.

    It appears WG has minimum post requirements for a good bit of content, so I may spend a *little* less more time there to get more info. In all reality, I have always heard that was the prime resource for homebuilders - but MDS always comes through.

    A friend is printing me one now.
    I can drop it in the mail, if you want.
    I’ll need to get an MP5 flat. Lol.

    I have a FF Creator Pro, so printing one is easy - I'm just nervous about plastic in a 20 ton shop press (if only because I don't know how to not [snicker "more power"] and put the pedal to the metal so to speak. Although, I'm not sure on material - the original file on Thingiverse suggests PETG, but I usually use ABS as a minimum and Taulman alloy 910 for anything super strong (for example, my drone parts when I was still cranking them out - despite having long ago earned the nickname "crash" I never manage to break a single one of my printed parts when using that stuff).

    I've gotten away from 3D printing for a bit and now that I've come back I am seeing there exists all sorts of high strength filaments - though many require hardened nozzles and/or all metal hot ends...

    ^^ This there are several "how to's on there" HK's are fun to build,
    Parts Kits are Hit n Miss, Prefer The MP5 Kits use the LSC "Flats" with
    Weld Kit, got the JIgs, a Friend made some (metal) don't have the Tig
    Welder anymore (access to) my stuff is boxed up waiting patiently for
    the move, same old line they ain't an AR (assemble) vs. Build.The 91's
    are also fun to build / 1911's / AK's / and others.
    "Jig-man" picked them up over the years.

    Jigs ain't cheap, nor the Flats. well ain't nothing cheap anymore
    good kits are crazy price wise...

    -Rock

    @KIBarrister
    Sent you a PM with some nfo (PDF Links)


    -Rock

    Cheers! The HK parts are the only thing I've come across that give my 2011 project a run for it's money (no pun intended) in terms of cost.
     

    jjones88

    Member
    Apr 4, 2013
    550
    Sykesville
    If you are serious into builds you’ll want to hang around weaponsguild.

    Several people in this thread post over there too, but that place is a goldmine of info and it’s well worth building up your post count.

    I’ve done a few hk builds and have a lot of the tooling. The 3D printed stuff does work but the knowledge of how to get the flat straightened is either experience or deep diving into the guild.
     

    teratos

    My hair is amazing
    MDS Supporter
    Jan 22, 2009
    48,757
    Bel Air
    As soon as it is no longer a flat. Any work on it progresses the manufacturing process beyond 80%.

    Yep. I have quite a few pre-13 80% lowers that I merely did the pin holes for....
     

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