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New build, arduino, motomonster, 2dof

Discussion in 'DIY Motion Simulator Building Q&A / FAQ' started by substatica, Jan 2, 2015.

  1. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    My Motion Simulator:
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    Hi substatica this cooler is too small, really bad cooler due to bad thermoconductivity. Better something like that:
    chipset1.jpg
    • Like Like x 1
  2. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    I did covered and uncovered, it does not matter at all. But @noorbeast is in right, capacitors are not needed to be covered.
  3. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    I got 3 of the Motion Dynamic motors in one order and two took 12mm shafts and one 1/2. I concluded it must be a supplier batch issue and it pays to check the actual size. I am guessing that could be the same with similar style gearboxes.
  4. Nick Moxley

    Nick Moxley Well-Known Member

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    Ive had 6 Normal style boxes through my shop and 2 of the "funky" boxes, All but the funky boxes took 1/2" Not that I dont believe you Noorbeast but i would be shocked if Motion Dynamincs guys are sourcing boxes from the same factory. Although anything IS possible.
  5. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    That is what I got, three in the same box, but one was different and I didn't notice until I went to put shafts in them, as they look identical. Two have since been replaced with 60:1s.
    • Informative Informative x 1
  6. substatica

    substatica Member

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    I thought I'd ask the seller I got the motor from, GEAR MOTOR 12 VOLT GREAT FOR SAWMILL/CRAB POT PULL/FEED 75-80RPM 50:1, before taking the path of attempting to hammer the shaft in and this is the response I got. They've been very good to deal with FYI.

  7. Nick Moxley

    Nick Moxley Well-Known Member

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    Good stuff, so as i assumed 1/2".......Noorbeast you must have gotten the 1/100 fluke gear that was a 12mm Diam.
  8. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Sure did @Nick Moxley!

    They do look identical but I consider it too tight to try and hammer a shaft through and I don't have equipment that would let me drill a hole that large that long accurately. It was better to just change the shaft stock to the proper diameter.
    Last edited: Jan 16, 2015
  9. substatica

    substatica Member

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    So I've got a pretty sloppy drill press, do you think I should go at it with a 1/2" bit or just hammer away at the 1/2" shaft?
  10. Nick Moxley

    Nick Moxley Well-Known Member

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    Tap the shaft in, The little knurl from the Drilling of the Small holes shouldn't damage the threads too much, I can still thread the nuts on by hand.

    If you have a Round file that could help remove some of the crap from the smaller holes, I use dremel with a round sanding drum
  11. substatica

    substatica Member

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    Further info from the motor seller, they've graciously offered a partial refund to make up for the fact that the listing details said the motors accept a 1/2" shaft, which the delivered motors, in their current state, do not. Wait for your motors to arrive so that you can measure them before sourcing shafts or machining parts folks.

  12. shannonb1

    shannonb1 Well-Known Member

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    Can you post a picture of the shaft that youre using?
  13. substatica

    substatica Member

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    I'm still waiting on the 12mm shaft I ordered to arrive. There's no way the 1.2" was going to be hammered in, the bore measured just slightly under 12mm, an extra .7mm wasn't just going to get hammered it. The 1.2" shaft and the 12mm shaft are both listed in my parts list (which I'm updating) on page two of this thread,

    http://www.xsimulator.net/community...duino-motomonster-2dof.6159/page-2#post-67913
  14. Nick Moxley

    Nick Moxley Well-Known Member

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    Curious why you would use solid shafts and not just threaded rod ? Are you planning on relying on the small 4mm key holes to secure the shaft to the gear ?

    And FYI the only reason we suggested to tap the shaft in with the hammer is the fact we assumed you were using the right size axle for the gear. Add in the fact the 4mm key holes have a little bit of flashing left over from being drilled at the factory That usually catches on the threads of the Threaded rod and can easily be tapped with a hammer. Obviously we know a 1/2" rod Wont fit into a 12mm hold.
  15. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Yep I did warn it was necessary to check and get the right shaft size.

    On my hollow shaft gearboxes I tapped the shaft and used M6 bolts to secure the box the the shaft.

    20141023_155450.jpg
  16. substatica

    substatica Member

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    Yes, I was planning on using the key holes and beefy spring pins to hold the shaft in place, hopefully in addition to a good friction fit. I don't have a tap/die set at the moment I never considered tapping the bore. These forums are a wealth of knowledge, but the best approach is sometimes difficult to discern with limited tools. I'm pretty new to machining parts like this, the first suggestions of tapping it into place did seem feasible until I had another look at the parts and measured again -- I didn't mean to offend anyone.
  17. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Just for your consideration @substatica. The tap and die set I used was about $6 at the local hardware, I have used it in multiple places during my build and while not quality equipment it has got the job done.
    • Like Like x 1
  18. substatica

    substatica Member

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    I hate to have a bad tap/die destroy a part I'd have to make or order again, as well I have no experience with them so it would be another skill to learn -- which I want to -- just too many new skills on the same project usually leads to somewhere bad ;)
  19. noorbeast

    noorbeast VR Tassie Devil Staff Member Moderator Race Director

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    Yes I get that @substatica, so much to consider and learn along the way. Do go with what is best for you. When something is new then test it out on a bit of scrap first.
    • Agree Agree x 1
  20. substatica

    substatica Member

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    Totally. Thankfully I'm starting to build up some metal scrap to experiment on.

    At the risk of going off topic, I've gotten quite disenchanted with the quality of most tools, tired of sockets stripping bolts, drivers stripping screws or shearing their own heads, the quality of pretty much everything has gone down drastically (perhaps this is just what's available in downtown Toronto, other localities may have higher standards in shops) -- I've pretty much decided to only invest in tools I believe will perform well and last a long time. For that reason I shy away from buying things like a tap/die set at the local hardware store which is the right size without some research or trustworthy endorsement. I mean these days you can't even feel the build quality of a lot of tools without having to tear open the blister pack first.