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Thread: BT48 Rebuild

  1. #1
    Join Date
    Nov 2006
    Location
    , Sylvania Ohio
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    68

    Default BT48 Rebuild

    I started this thread in modifications but other things drew me away from the rebuild of this BT48. I have now completed it, this is where I started. I disassembled the entire machine to start from the ground up.


    First was to make the legs rigid and to set up the base plum,level and square. I dropped the cross members down to accommodate linear bearings and a t-slot aluminum table.
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    Last edited by dewey_dog; 03-29-2016 at 10:13 PM.

  2. #2
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    Nov 2006
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    , Sylvania Ohio
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    Table set up and then off to the weld the base together will continue soon.



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  3. #3
    Join Date
    Sep 2012
    Location
    Blaine Mn
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    Default

    [QUOTE=dewey_dog;189208]I started this thread in modifications but other things drew me away from the rebuild of this BT48. I have now completed it, this is where I started. I disassembled the entire machine to start from the ground up.




    How did you get that tiny dog to balance on the blue upright is what I would like to know?

  4. #4
    Join Date
    Nov 2006
    Location
    , Sylvania Ohio
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    I took a lot of training but he has mad balance skills now. I wondered how long it would be till someone noticed that.

  5. #5
    Join Date
    Feb 2015
    Location
    Alberta
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    109

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    Oh! I thought you photoshopped the picture! LOL

    Congrats on the success of your dog training program!

  6. #6
    Join Date
    Nov 2006
    Location
    , Sylvania Ohio
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    Actually Otis (the dog) is standing on my bench waiting to get his nails cut when the photo idea came to me.
    I digress back to the build, the THK linear bearings for the moving table were difficult at best to properly align and it took a special iron manipulation tool with optional torque enhancer to co-horse the large angle iron within shimming tolerance for the linear bearings.

    This level made it much easier to shim the bearings level with precision washers from McMaster Carr. but bolt hole layout must be
    precise.
    l
    After the base was welded I painted the base SB Blue again. I then focused re-building the gantry. I then quickly found that the old gantry sides were not going to work because there was not enough clearance. I had two new sides and gussets milled.

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  7. #7
    Join Date
    Jul 2011
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    Timmins, Ontario, Canada
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    This is very awesome so far.. Are you done and just documenting the build? Or is it as you go in real time??

    I love your dog. I miss having one around the shop. My shepherd used to jump up on the work benches too. Usually wanted to lie right where I needed to work too. All 85 pounds of her.

  8. #8
    Join Date
    Nov 2006
    Location
    , Sylvania Ohio
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    Ajcoholic thanks, this is done and running. Kudos to SB supports Frank and Tom for the help on the power up snafu's.

    So after the sides were milled it was time to reassemble the gantry. I was going to use the v-rollers but as I was knee deep already I decided to troll ebay again and found a set of NOS THK SHS 25 bearings for the Y axis. One thing I have learned doing this is read and educate yourself on the working parameters of the linear bearings. SHS can be used in any orientation where SR should be used horizontal etc. and only use new not used ask me why....

    The placement of these rails is obviously critical so I set the first using a caliper and the second lower with a scrap piece of aluminum bolted to the bearing trucks so they were equidistant.

    The y axis now needs to be addressed as the linear bearings hold the Z car out further so a piece of 1X1.25 stock created the proper offset and the rack was attached with 3M tape like factory.

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  9. #9
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    Nov 2006
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    , Sylvania Ohio
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    Next came the Zcar I trolled ebay again and found some bearings that worked. I made a new car from .5" machined plate and the bearing mounts from .75"



    Then mount the gantry sides

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  10. #10
    Join Date
    Nov 2006
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    , Sylvania Ohio
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    It was time to mount the gantry.

    This went better than I expected and the hoist made it safe and easy.
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