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Gunsmithing The New Shop's 1st thread. 8-40 base holes

LRI

LRI

Lance Criminal
Full Member
Minuteman
    • Mar 14, 2010
    6,346
    7,709
    53
    Sturgis, S. Dakota
    www.longriflesinc.com
    #1
    Since it was a recent topic here and because I have a couple to do, I figured I'd show how we open base holes here.

    The "squeaky clean" dinosaur Haas in the new shop is the tool of choice for this. Girly did one hell of a job scrubbing this dirty pig. You could eat off it now. What a girl!
    smile.gif


    DSC_0001.jpg


    First is squaring up the action. We set it on the lug, indicate off the raceway just to double check, and follow up with indicating off the centering mandrel to ensure the action is pointing down the X axis correctly.

    DSC_0003.jpg


    DSC_0004.jpg


    Next is finding center. Just ding each side of the mandrel with the edge finder and split the value in half.

    Location of the front hole completes the setup.

    DSC_0006.jpg


    Last is touching off tools on my ghetto home made tool setter (an indicator super glued to a gauge block) so that a reference height for the tools is established. This allows me to go from one action to the next without having to touch off all the tools again. I just use one tool and adjust the work plane height.

    DSC_0002.jpg



    Now we can make some chips!
     
    #4
    Re: The New Shop's 1st thread. 8-40 base holes

    It's the Haas Moses used to carve the 10C's.
    smile.gif


    10/92 is the B day for ol girl. Rebuilt the spindle about 2 years ago, replaced the doors with some home made's 4 months ago, and replaced the bubble screen/keypad two months ago.

    Runs like a watch!

    Now were chewin!

    DSC_0007.jpg


    DSC_0009.jpg


    DSC_0009.jpg


    Gaugin hole ID's. Right on the money. .140" is what I use for 8-40's.

    DSC_0012.jpg
     
    #6
    Re: The New Shop's 1st thread. 8-40 base holes

    Now were onto another part of this.

    IMHO the only place bedding is needed is between a stock and an action. I don't "bed" bases to rifles.

    I lap them in. Takes longer, makes a mess, but I don't care. It's nice to be king now and again.

    Kalli actually did part of this one. She was a little nervous so I finished it for her. (she was doing fine, just being a girl)

    DSC_0016-1.jpg


    DSC_0018.jpg




    This base was purchased before the build and is fitted for 6-48 screws. We need to chew on it to accept the 8-40's the action now has.

    Simple program driven off the same one used to enlarge the receiver holes.

    DSC_0015-1.jpg
     
    #11
    Re: The New Shop's 1st thread. 8-40 base holes

    Chad care to share you base lapping? I can see doing it with a base that is already close but how much of a tolerance will you work with before you call the base defective and reach for another one?
     
    #12
    Re: The New Shop's 1st thread. 8-40 base holes

    Love the work. We have a good old TM-2 that I plan on doing a similar op with this week. Hass makes great machines.
     
    #13
    Re: The New Shop's 1st thread. 8-40 base holes

    Basically it goes like this. If the two don't fit well I first strap the action in a piece of 100 grit emery and hose it with Kroil/WD-40/spit, whatever and work that base back and forth like a 14 year old does his right hand until it's close.

    Then I peel the emery off the receiver and get jiggy with the messy stuff.

    So far it works well. The trick is to get your "stroke"
    smile.gif
    down so the ass end of the base isn't wandering all over the place as you do it. Someday I'll make a fixture for it probably, but I've gotten pretty good at just going at it "freestyle".

    C.
     
    #16
    Re: The New Shop's 1st thread. 8-40 base holes

    I guess bases with recoil lugs on them are out of the question for this procedure, what about aluminum bases? It would seem to me that the base would just flex all over the place when you are applying pressure to it. Unless you clamp a lapping bar in the rings and use that as a handle?
     
    #17
    Re: The New Shop's 1st thread. 8-40 base holes

    If your man enough to flex a NF DM setup while lapping it, I'd suggest either anger managment or a night in a brothel.

    They perty stout.

    The NFDM has a lug btw. Just takes a little patience.

    FWIW the lapping bar idea has merit! Good point!
     
    #18
    Re: The New Shop's 1st thread. 8-40 base holes

    Dammit Chad quit giving me ideas...the brothel, not the lapping. J/K I like the idea of lapping the base to the action. Still chuckling over the moses ten commandments statement.
     
    #19
    Re: The New Shop's 1st thread. 8-40 base holes

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: C. Dixon</div><div class="ubbcode-body">

    FWIW the lapping bar idea has merit! Good point!


    </div></div>

    I would think clamping a lapping bar in there would, if nothing else, give you a much easier handle to hold onto whilst doing the lapping, but also stiffening the setup even more.
     
    #23
    Re: The New Shop's 1st thread. 8-40 base holes

    A few updates on this bugger.

    This is actually a full build. We had some reamer issues to contend with.

    I've learned the 6mm Long Dasher is NOT a 6.5x47 Lapua Necked down to 6mm.

    Neck lengths are different.

    Some monkey's are making 6 Long Dashers by taking the std dasher and chambering it deep.

    This is wrong too. You end up with case webs that resemble fat girls in tight pants.

    Just some info.

    Anyway, onto the fun stuff.

    This action got the Tier One level accurizing job along with a new barrel from Brux and one of my in house built CF varmint/light tactical stocks.

    The owner requested additional height on the cheek piece so we built this one up. Started with some CF rod I bought at the hobby shop to make a "spiny urchin" on the top of the CP. this gave us structure. Then I chopped up some CF with other fillers till it looked like oatmeal cookie dough. We piled that on, let it sit overnight, and finished her off this morning.

    Stock reminds me of a Robertson Composite Lazzaroni/HighPower Silhouette stock.

    Fitted a PTG hinged floor metal for it too.

    Just a nice, light Coyote killin machine for eastern WY.

    Fun stuff.


    We'll be wrapping this up this week along with a couple other builds.


    Were rollin!

    C.

    Receiver work:

    DSC_00012.jpg


    DSC_0002.jpg


    DSC_0001.jpg


    DSC_0004.jpg


    DSC_0006.jpg
     
    #27
    Re: The New Shop's 1st thread. 8-40 base holes

    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: C. Dixon</div><div class="ubbcode-body">UGLY HUH?!


    Give it a week!
    smile.gif



    </div></div> Only for a lil while.
     
    #28
    Re: The New Shop's 1st thread. 8-40 base holes

    Last update for the day.

    Sanding/filling/cussing/bondo work is done.

    Stuck a pad on her ass and we'll call it a night. Waiting on some new abrasive belts to try for grinding these buggers to fit.

    DSC_0002-1.jpg


    Little resin for good measure.

    Soon as they get here we'll wrap this one up and get some paint on her.

    Gnite!

    Will, check your PM's. Need you to give us a call when you can.

    C.
     
    #30
    Re: The New Shop's 1st thread. 8-40 base holes

    It's a setup tool for my mill.

    Goes something like this:

    The vice on the right is where the inlet always goes for the receiver. If a 1.350 OD action is on showline half the receiver will be in the stock, half will be out.

    All my tools touch off to the top of the vice jaw. The work offset is then adjusted positively .675" (half of 1.35) so that when the stock is clamped up, you can lay the receiver on the jaw and see exactly how/where the tang will line up with the stock.

    The bar is also touched off to the jaw. When I give a "G43 H16 Z0." (G43='s tool height callup, H16 is the height for the tool number, Z0. is the desired position/location of that tool) command the bar rapids to that exact height. lay the top of the stock to the bottom of the bar and clamp the vices. Stock is now set at a qualified height and ready to be aligned and centered in the X/Y axis.

    Werks perty goodz. Just wanna make sure you NEVER accidently command the spindle to come on. That would be ugly! So far (knock on wood) it's never happened.

    c.
     
    #31
    Re: The New Shop's 1st thread. 8-40 base holes

    baking soda and super glue to fill the holes?


    <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: C. Dixon</div><div class="ubbcode-body">
    DSC_0066.jpg


    DSC_0065.jpg


    DSC_0064.jpg


    Gotta love the acne:

    DSC_0063.jpg


    DSC_0062.jpg


    DSC_0061.jpg


    DSC_0060.jpg


    </div></div>
     
    #33
    Re: The New Shop's 1st thread. 8-40 base holes

    Polyester%20Glazing%20Putty.jpg



    Try this stuff.
    You can thin it with acetone .

    It will even fill a Brown Precision stock blank in one pass and a touch up.

    After it cures it's bonded to the blank.
    The car finishers did not use this as it is too hard to sand after curing so this was a special order.

    I tested this throwing blanks at a concrete wall and customers use hunting here in Alberta .

    Glenn
     
    #34
    Re: The New Shop's 1st thread. 8-40 base holes

    the "polyester" part is what concerns me.

    It's been my experience that it shrinks over time. I've seen similar products leave little dimple marks on a stock later down the road.

    We do use a glazing puddy, but its urethane base and even still, we use it very sparingly for light scratches and feathering.

    Thanks though.


    The baking soda/superglue trick is surprisingly effective. For little holes its nice because you can pack the soda in with a stick/finger and the thin CA sold at better hobby shops has such a strong capillary action that it'll wick into the void and soak the soda 100% in one shot. The trick I've learned is to keep the CA in the refrigerator. It keeps it fresh and also slows the reaction down a little bit. You want the stuff to saturate the soda, then cure. Not get part of the way in and go off. That sucks as the center will be dead soft.

    I buy these little catheter attachments that allow for really precise application. Again, the hobby shop is your friend.

    C.

    C.
     
    #37
    Re: The New Shop's 1st thread. 8-40 base holes

    Yesterday's trip to the range went well.

    Here's some pics of the finished rifle:


    Here's 3, 3x groups fired by 3 different people. Fortunately I had the "ringer" so I don't have to buy beers next time we go out.

    DSC_0050.jpg


    DSC_0051.jpg


    This thing is a peach of a gun. Lots of fun to shoot. Customer is coming in today to pick it up, so lets hope he feels the same way.

    DSC_0039.jpg



    DSC_0037.jpg


    DSC_0038.jpg


    Cartridge is a 6mm Long Dasher. We used 6.5x47 Lapua brass for the parent case.

    DSC_0049.jpg


    DSC_0048.jpg


    DSC_0047.jpg




    This concludes this build thread. One more down, hopefully many, many more to go.

    C.

    PS: No range rods, magic wands, or Ouija boards were used during the construction of this rifle.
    smile.gif







     
    #43
    Re: The New Shop's 1st thread. 8-40 base holes

    Will sell you a bright hungry college student at SDSU. Wizard on the computer ..hard worker and understands custom rifles because his old man introduced him at an early age. He graduates in the spring and will sell his soul to stay in South Dakota. We used to live in Rapid City and love the area
     
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