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Question Which gearbox?

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by principiamacb, Apr 24, 2017.

  1. principiamacb

    principiamacb Member

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    Ive noticed that people use 25-1, 50-1 and 60-1 gearboxes on here regularly and some even change gearboxes on their rigs. I understand the 50-1 boxes dont move and are more suited to compact rigs but there is very little mention as to how this effects the speed of motion bearing in mind there can be 3x a differance in rpm (65 rpm v 180 rpm).

    I have 60-1 gearboxes ready to be drilled for my pots and want to make sure these are best suited to what I need. Im building a shoulder mounted seat shaker for VR.

    My calculations are

    65rpm
    70mm arm
    476mm p/s.

    25-1, 180rpm, 40mm arms. 750mm/s
    As scn5 run at 400mm/s unloaded, (250mm loaded) mine should be faster.

    scn5 look like they run really fast and would be happy with that speed and the calculations suggest mine should be faster.

    There is a massive difference in speed between 25-1 and 60-1. Does this translate to speed of motion or does torque play more of a role in how fast the rig moves?
  2. Ads Master

    Ads Master

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  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    It is the design that dictates what torque/speed suits best.

    25:1 are popular because they suit a shoulder/foot/knee design pretty well, at and affordable cost. The 60 and 50:1s are useful in things like compact designs, where there is not as much design leverage and hence more torque is needed.
  4. principiamacb

    principiamacb Member

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    Thanks for the reply.

    Are my calculations correct and translate into the real world in that 65rpm with 70mm arms run at 476mm/s therefore are quicker than scn5s?
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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  6. principiamacb

    principiamacb Member

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    Oh thanks. I've not seen that. I'll check it out.