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Question Need to Start Sourcing Out Hammer O Rings forVM 68 - REPOST FROM MCB 2.0

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  • infamoussmiley
    replied
    Hello!

    At the moment, I am still testing when I can and saving up for the first production batch. I will keep you posted

    Best,


    Smiley

    Leave a comment:


  • Giuseppe
    replied
    The new rings were sounding promising. Any news since then?

    Leave a comment:


  • infamoussmiley
    replied
    And this is ALL I can get from the Way Back Machine. There were more posts. Essentially, I made progress since then:

    - The 3D Printed hammer rings did not work and actually shredded apart after a few hundred cycles, and we had burping in the recock action.

    - Grooving the hammer for regular o rings is inconsistent and time consuming. And permanent. Essentially, you need a lathe to do it 100% correctly, but then you run into the same issues as the Chinese S4's hammers. There is a reason that the factory Hammer ring is compressed and made of the certain material. But Chaos was super crucial in exploring this option, and the modification does work if you can pull it. So BIG thanks to Chaos!

    - I went with injection mold as a process for making the factory style hammer o rings. To do this, we had the original factory stock hammer o ring measured professionally by three different outfits before making the molds. I did not trust those measurements presented earlier in this thread and had it done professionally for accuracy. We took those measurements to create the molds. Everything from measurements, to molds, to the "prototypes" was very expensive. By January of 2020, I had eight prototype hammer rings that seem to be completely identical to the factory seals of yester year. I have six of the eight prototypes in VM-68s that were not cycling properly and had hammer o rings that were gum. For testing purposes, Yeti and I tested the hammer seal at low PSI of 450 PSI to 1300 PSI. At the moment, all prototypes are allowing for flawless recocking action in the VM 68s. If anything, the VMs are recocking in colder weather which is "Neat".

    That is all I have for now.

    Best,

    Smiley

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 6-12-2017 by pghp8ntballer:

    I just talked to Smiley yesterday. He said that the route he was pursuing it would be a couple grand to get the seals made. Unfortunately I do not have more info beyond that.

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  • infamoussmiley
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    Posted on 5-30-2017 by Giuseppe:

    Any updates?

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  • infamoussmiley
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    Posted on 2-11-2017 by infamoussmiley:

    I wasn't the one who did the 3d printing. I was just told they were done from a urethane stock. Either way, the 90 durometer felt off. And the round outer edges weren't uniform. They have to be to work right.

    Can you tell me more about the different options for Urethane? Maybe we used the wrong type?

    Smiley

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  • infamoussmiley
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    Posted on 2-10-2017 by Tracker:


    i feel like there are more options for filament types, when you say urethane, im going to assume TPU, right? TPC perhaps? or ninjaflex TPE.. shame you cant but a few meters of sample materials for cheap to text the different types of materials

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  • infamoussmiley
    replied
    Posted on 2-10-17 by infamoussmiley:



    Quote:
    Originally Posted by Tracker
    what material did you try the 3d printing with?


    urethane. Tried 70 and 90 durometer.

    Smiley

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 2-10-2017 by Tracker:


    what material did you try the 3d printing with?

    also playing a but of catchup on the suggestions, have you tried stacking a standard o-ring on top of an x-ring (quad 0ring) ala ule trigger shutoff on a mag, or would that not get the o-ring out far enough??

    im talking about an x-ring in first, then a properly sized o-ring in second.. or does it need to be a smooth surface to push the hammer back


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    Last edited by Tracker; 02-10-2017 at 07:03 PM.

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  • infamoussmiley
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    Posted on 2-10-2017 by infamoussmiley:




    Quote:
    Originally Posted by Giuseppe
    Has anybody been able to make progress on the magic rings?


    Yes. Testing two sets of prototypes. Technically three sets. The third was a bust. We tried 3D printing them. They did not hold up after 20 cycles.


    The two sets we have are installed in 6 VM-68s each that are in varying states of "usedness". Really hoping that the injection molded ones work out the best.

    Will keep you all posted.


    Smiley

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 1-31-2017 by Giuseppe:


    Has anybody been able to make progress on the magic rings?

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 11-1-2016 by infamoussmiley:


    Might have found a place that can make the Hammer rings. Waiting for a quote. Crossing fingers.


    Smiley

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 10-24-2016 by Infamoussmiley:


    Quote:
    Originally Posted by TomsGunShow
    Here's a document i found in the Harvard dept of physics online library. Its called the oring handbook. Not sure if this will be of any use but i thought it wouldn't hurt to show you.

    https://www.google.ca/url?sa=t&sourc...TdedkUtiDm4BUg

    Sent from my LG-D852 using Tapatalk
    Thank you

    I printed it out and put a copy in the one volume of the shop bible. thank you

    Smiley

    Leave a comment:


  • infamoussmiley
    replied
    Posted on 10-23-2016 by TomsGunShow:


    Here's a document i found in the Harvard dept of physics online library. Its called the oring handbook. Not sure if this will be of any use but i thought it wouldn't hurt to show you.

    https://www.google.ca/url?sa=t&sourc...TdedkUtiDm4BUg

    Sent from my LG-D852 using Tapatalk

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  • infamoussmiley
    replied
    Posted on 10-23-2016 by infamoussmiley:


    Quote:
    Originally Posted by BadAcid
    I'm sure this has already been tried and I will sound stupid for asking, but has anyone tried replacing it with a similar oring tight enough to not blow off and then using a higher viscosity lubricant like shocker lube or Dow 33

    *** Note I have never fired a vm68 or tried to repair one ***


    yeah... it doesn't work.


    We are working on a solution, but it's not going to be cheap.

    Smiley

    Leave a comment:

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