Blanksguy wrote:1: Go to the top of the MG42 Forun Index page and "click" over top of the "MG42 FAQ" Block.....when the next page comes up............"click" over the "Basics" Block for the next page..........then "click" over top of the "Blank Adapting the MG34 and MG42".....and read the information to see if it gives you some more information as to what your gun is doing........then:
Blanksguy wrote:2: (Goes back to being lead down this "road" again without all of the information)....please list down what you have (IE: FA MG42 or semi-only SA42 that you have built?.....8x57mm gun...or 7.62x51mmNATO/.308 gun........etc.)....then:
Did/does the gun fire live ammo correctly? (IE: It is easier to Blank-Adapt a gun that you know works....then to try to trouble-shoot a mis-firing gun that doesn't work to start with).
Blanksguy wrote:With a working gun.....what did you exchange to make it fire Blanks?....and what Blanks are you trying to use?....what belts are they loaded in (IE: WWII German belts, post-war belts, or DM1 Post-War belts?)
Blanksguy wrote:Tell us if the weapon is properly lubricated and clean to start with (Not that you would try it any other way to weed-out possible problems during first operation with Blanks).
Blanksguy wrote:A detailed list of the Blank-Adapting parts that you substituted on your gun.....and any "restrictions (and sizes of same) that are used in your system will help us weed out the problem area and come up with suggestions for you. A photo of that Blank-Adaptor that you are trying to use will help.
Blanksguy wrote:On a side note.....what are the markings on the head-stamps of the case bottoms that you are trying?......these wouldn't per chance be Israeli manufactured wood-tip Blanks (usually have a blue-colored wood-tip-bullet) ...?
With your MG42/MG3 set-up to fire WOOD-TIPPED Blanks in 7.62x51mmNATO of Swedish manufacture......your basic problem is that the weapon is not going into full recoil due to loss of gas-pressure. This is shown by the second case in the photo being crushed/neck pushed back because the bolt did not recoil far enough to hit the buffer hard enough to have the ejector-rod/ejector hit the fired case off of the bolt-head/extractor....it just stayed on the bolt and went back forward. The case on the left has a light hit/dent.......but if you check your fired "live" cases you will see that this was normal...or even a light dent for normal operation. MG42s and MG34s are hard on cartridge-cases.
Blanksguy wrote:When you said that this is a "completely new weapon"....did you mean an unissued MG42 ?...or an unissued MG3 ?
Note: The belts (in your photos) that you are using are correct...and appear to be of current German DM1 design for 7.62x51mmNATO ammo.
Blanksguy wrote:Looking at the Blank-Adaptor that you are using of "Swedish-manufacture"...it looks well made...but may have excess holes for what you are trying to fire....or the center-hole is just a bit too large by .010"....or even .015". Next is that the 7.62x51mmNATO WOOD-TIPPED Blanks may be too weak....not all Blanks are made for "universal" use by all of a countries weapons. Before you try to change the hole-size on your Blank-Adaptor..........try to locate a longer Barrel-Bearing. The one in your gun probably measures about 1.865" long.......and the longer one will measure about 1.970" long. These are interchangeable (except the very early MG42 barrel-bearings with a different inside configuration). By changing to the longer barrel-bearing.....the gas-pressure from the fired Blank should stay inside the booster area for a split-second longer.
Note: With the MG3 Blank-Adaptor you are viewing...you do not use a booster-cup.
Blanksguy wrote:Next (if the longer barrel-bearing did not cure the short recoiling of the bolt)....you will have to get a spare recoil-spring and cut off 2-3 coils to allow the bolt to recoil easier. This was one of the items that the Germans used on some MG42s during WWII when they were used for training with Blanks to get better recoil.
Blanksguy wrote:Last....if the longer barrel-bearing and shorter recoil-spring does not help......you will have to decide if you want to close up one or two of the holes in your booster rear that are on the out-side circle-area to keep slightly more pressure in the booster-area during recoil. ...."or" you could try to drill/tap the center hole for and allen/hex-bolt that you will drill out for the proper restriction. During testing, drill out several allen/hex-bolts to different sizes for added (or less) pressure. If you do this....start with the same size restriction that you have now in that front/center hole/restriction.........and work down in smaller sizes by .010" until the weapon just operates correctly.
Blanksguy wrote:Note: Most 7.62mmNATO wood-tipped Blanks are using a slower burning gun-powder than most Blanks that you come into contact with. This changes the burn-rate......and will effect how the weapon recoils. This may also be one of the reasons why your "system" is losing pressure and not having enough power to recoil the action hard enough to eject the fired Blank-cases.
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