A&P Creating a center punch for class

Discussion in 'Lifestyle' started by Perkwunos, Sep 7, 2008.

  1. Perkwunos

    Perkwunos Dog Bones OT Supporter

    Joined:
    Aug 24, 2004
    Messages:
    10,625
    Likes Received:
    0
    Location:
    Abu Dhabi, UAE
    I am enrolled in a class this semester which is basically a machine shop class, where we learn about machining and building different parts, dimensioning drawings properly, and some of the physics behind machining. So, I decided to take some pictures of what I was doing. I am not sure if this belongs in OTAP, but what the hell. I am trying to take pictures of mechanical things, because it is what I like, and will be my job. C&C is welcome...

    [​IMG]

    To begin with, I cut off the work piece to create the punch, a little longer than 4” as I was using a k=hack saw to do this, a hack say has a surface finish that is fairly rough about 0.020” of depth.

    Measuring and marking:
    [​IMG]

    Cut piece:
    [​IMG]

    Next I setup the lathe for a drawbar and a collet

    Soo many collets, which one will I choose…
    [​IMG]

    ½” should work nicely
    [​IMG]

    Inserting collet holder
    [​IMG]

    Work piece clamped n the collet
    http://farm4.static.flickr.com/3288/2834231054_7bc0f8f8ed.jpg

    Measuring work piece in order to turn it down to final diameter of 0.465” from measured
    [​IMG]

    Micrometer measured the piece to be 0.501”, it is a crappy micrometer, and got turned when I set it down to take a picture, so it is reading 0.505 here.
    [​IMG]


    Turning the piece down, this was the first pass, I removed 0.020” of material, and made a second pass after this to take it down to the final diameter.

    [​IMG]

    After turning the piece down, I switched tooling to add knurling to the punch. This is the knurling tool mounted in the holder.
    [​IMG]


    And here is the piece being knurled.
    [​IMG]

    Piece out of collet, with finished knurling
    http://farm4.static.flickr.com/3043/2834234852_f01beda264.jpg

    Another angle
    [IMG]http://farm4.static.flickr.com/3022/2834234860_b8dc87e436.jpg


    The next step after this was to rechuck the lathe to a 4 jaw chuck, center the work piece, and then turn the taper.

    4 jaw chuck:
    [​IMG]

    [​IMG]


    Piece wraped in coper to protect the knurling:
    [​IMG]


    [​IMG]


    Dial indicator mounted to check the runout on the workpiece and center it in the chuck:
    [​IMG]

    Piece centered with about 0.001” runout
    [​IMG]

    [​IMG]


    The next step was to face the end of the piece:
    [​IMG]

    The last picture I got before my battery died ☹ was of me tapering the end of the punch
    [​IMG]
     
  2. isaac86hatch

    isaac86hatch This thread sucks

    Joined:
    Oct 3, 2005
    Messages:
    27,892
    Likes Received:
    0
    Location:
    Oregon
    How It's Made ftw!
     
  3. Hyperite

    Hyperite Vagina Junction OT Supporter

    Joined:
    Apr 29, 2002
    Messages:
    28,531
    Likes Received:
    21
    Location:
    Seattle, WA
    Well, the pics are badass, so I'd say A&P is a good place for them ... :bigthumb:
     
  4. Gvidon

    Gvidon New Member

    Joined:
    Oct 22, 2006
    Messages:
    16,893
    Likes Received:
    0
    Location:
    Los Angeles, CA
    No CNC for home? I hate calibrating on a 4 jaw chuck.

    I like the pictures.
     
  5. OlafBeserka

    OlafBeserka girls pee pee when they see me OT Supporter

    Joined:
    Jul 5, 2005
    Messages:
    7,485
    Likes Received:
    0
    Location:
    Hella Bay Area
    I had a manufacturing class in highschool and loved it. We had 2 lathes, a huge mill and 4 cnc machines. I miss messing around with that stuff. Manufacturing FTW
     
  6. Perkwunos

    Perkwunos Dog Bones OT Supporter

    Joined:
    Aug 24, 2004
    Messages:
    10,625
    Likes Received:
    0
    Location:
    Abu Dhabi, UAE
    The next thing I am supposed to make for this class is a 1" cube, which does not sound so bad, but I know it is a geometric tolerencing nightmare...

    If anyone has any criticism about any of the pictures, I would love to hear it.

    I have never used any flashes/strobes before, so I think I may try that next time, the lighting in the room was disgusting.
     
  7. OlafBeserka

    OlafBeserka girls pee pee when they see me OT Supporter

    Joined:
    Jul 5, 2005
    Messages:
    7,485
    Likes Received:
    0
    Location:
    Hella Bay Area
    The pics look really good. A tad on the yellow side, but it keeps that industrial characteristic me thinks
     

Share This Page