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  1. #1
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,541

    Default A gun related side line

    One of the fitters at work is a keen shooter. He knows that I have a mill with dividing head (which he doesn't) and asked whether I could make up a bolt handle for him. He's going to come back with a sketch and was talking about spiral milling...
    These are just some trial pieces based on some 'net pictures. They would need to be deburred/ blasted and painted if they were to be used but you get the idea (dimensions are around 40mm high and 25mm diameter). Apparently the real trick is putting a thread on the bolt. He can sort that bit.

    P1020824 (Medium).JPG

    Making these (where the cuts have to intersect in a regular fashion) has shown me that I have slight TIR and backlash issues on my dividing head. More things to fix!

    Michael

  2. #2
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Nice work Michael.

  3. #3
    Join Date
    Aug 2008
    Location
    near Rockhampton
    Posts
    6,216

    Default

    Nice, but I think you should make one like this...



    http://www.riflemax.com/images/bolt_..._boarder_2.jpg
    Gold, the colour of choice for the discerning person.

  4. #4
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,541

    Default He got his spiral


  5. #5
    Join Date
    Jun 2011
    Location
    Australia east coast
    Age
    71
    Posts
    2,713

    Default

    Quote Originally Posted by Michael G View Post
    Nice machining, but as an ex-shooter myself, I never had much time for people who did things like that to their firearms. Sort of like bolting bling onto a car......

    PDW

  6. #6
    Join Date
    Oct 2006
    Location
    Armidale NSW
    Age
    52
    Posts
    915

    Default

    Quote Originally Posted by PDW View Post
    Nice machining, but as an ex-shooter myself, I never had much time for people who did things like that to their firearms. Sort of like bolting bling onto a car......
    I also prefer function over form, but I think that statement is a little harsh and quite generalistic.

    While I agree that changing a bolt handle is sometimes done for purely aesthetic reasons, it is also often done for ergonomic/functional reasons i.e. changing the shape to make the bolt more comfortable to use, accessible, or to help position it better in a different stock, or to keep it from hitting the scope when cycling a round. Hardly like bolt on bling.

    So if you are going to/need to change it, why not go for something that looks nice.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  7. #7
    Join Date
    Jul 2003
    Location
    Sydney
    Posts
    493

    Default

    I like it!
    Civilized man is the only animal clever enough to manufacture its own food,
    and the only animal stupid enough to eat it.
    Barry Groves

  8. #8
    Join Date
    May 2011
    Location
    Salem Ohio
    Age
    65
    Posts
    219

    Cool

    Quote Originally Posted by Michael G View Post
    Apparently the real trick is putting a thread on the bolt. He can sort that bit.
    I do bolt threading with my lathe. I made a fixture that mounts in place of my lathes compound. I can swivel it a tad if the customer wants the knob angled back or kept straight. First I cut off the ball with a boring head that is mounted in my lathes spindle. Turned down it is now threaded with a hand die that is aligned with a fat live center in my lathe tailstock. I made some 1" dia brass knobs that everyone seems to like...Bob

  9. #9
    Join Date
    May 2011
    Location
    Salem Ohio
    Age
    65
    Posts
    219

    Cool

    Found my pics online. I just got a new computer and all of my pics are on my old one...Bob
    Attached Images Attached Images

  10. #10
    Join Date
    Apr 2008
    Location
    NSW
    Posts
    537

    Default

    Tactical bolt knobs have drawbacks. The increased length may make them easier to grab especially with gloves but it also causes extra sideways bolt binding . If the action to bolt fit is a bit sloppy and already prone to binding the longer knob makes it worse not better . You have to develop a pull straight back kind of bolt use not push across the centre line of the bolt . On a nice smooth Sako it works ok on a sloppy Mauser 98 not so good but you can develop the right pull back . If you watch some Military snipers using them they tend to hook a finger on the handle closer to the centre of the bolt after raising the bolt handle fully to pull back , this negates binding .
    The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.

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