Making a disc or Boxpok Driver

Mark St Clair Jul 20, 2021

  1. Mark St Clair

    Mark St Clair TrainBoard Member

    146
    692
    12
    Some of you know I have been modifying a Kato Mikado over the past year or so. Along the way I have been learning, and re-learning, both vintage and modern modeling skills. Here is my current challenge. Making a driver like this drawing:
    Disc wheel drawing.png

    The starting point is a standard Kato main driver:
    Mikado Main Driver closeup.jpg

    I have not found an off-the-shelf solution. Kato JNR prototypes have different designs. If there is an available overlay or insert, I have not seen it.

    Two questions.

    1) How would you do it? Please provide as many specifics as you can.

    2) What are the other appropriate forums to post this question in addition to N Scale?

    Thanks in advance.

    Stay safe,
     
    BNSF FAN likes this.
  2. JMaurer1

    JMaurer1 TrainBoard Member

    1,964
    909
    37
    No idea but I'm also interested is finding a way since the SP used a ton of Boxpox drivers
     
  3. acptulsa

    acptulsa TrainBoard Member

    2,316
    1,832
    50
    Fill the spokes with modeling putty, and use the putty to extend the ends of the counterbalance. Sand smooth, and drill four larger holes and two tiny holes (or make the tiny holes before the putty cures, and hope the sanding process doesn't fill them in). Enlarge and elongate the four holes with a round jeweler's file.
     
    Mark St Clair likes this.
  4. Mark St Clair

    Mark St Clair TrainBoard Member

    146
    692
    12
    I have some extra drivers after installing traction-tired models so I may experiment with this idea. Do you know of any example photos on the web?

    Thanks,
     
  5. acptulsa

    acptulsa TrainBoard Member

    2,316
    1,832
    50
    Nope. Just been considering trying it myself.
     
    Mark St Clair likes this.
  6. John Moore

    John Moore TrainBoard Supporter

    11,017
    5,678
    160
    This may be the solution.
    https://www.shapeways.com/materials/steel
     
    logging loco and Mark St Clair like this.
  7. JMaurer1

    JMaurer1 TrainBoard Member

    1,964
    909
    37
    Depends on the driver and how power pickup is done, but as I recall, this would probably work for the Mikado...is it the Mikado or the GS-4 that has the power pick up problems with having a steel piece behind the driver? Every time I go down this rabbit hole I end up with impossible (or difficult) answers that require milling the spokes back so you can put a polystyrene overlay for the Bokpox driver.
     
    Mark St Clair likes this.
  8. Mark St Clair

    Mark St Clair TrainBoard Member

    146
    692
    12
    Here's where I admit my lack of knowledge on what it takes to make a drawing that Shapeways considers acceptable. I also would be curious about cost. I only need a single pair of drivers. Assuming I produce an acceptable drawing, anybody know what I would expect to pay for setup and production of two wheels?

    I realize there might be benefits down the road for going the 3D printing route. Besides that, it would be pretty cool.

    In reply to Jeff, the first generation Mikados definitely had pickup problems related to the drivers. This is, sadly, one of those. I used the conductive paint fix to improve the situation. Anybody got any second gen driver sets they want to offload? Happy to help declutter your storage space if I can.

    Stay safe,
     

Share This Page