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Thread: Spur II build

  1. #1
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    Chris
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    Well this was Spur. It was my first featherweight and in general happy with it



    Good points
    - Chassis was solid. It used 10mm HDPE but the corners were joined with angle iron and had a 3mm base. You didn't want to drop it on your toe!
    - Traction. It used 4 drill motors with 100mm blue wheels with mountain bike tyre. The tyre had a nice open tread and wear rate was low
    - Its a lifter and the linear actuator was very powerful

    Bad points
    - The wheels were exposed so vulnerable. It got slipped once landing on a wheel wrecking the gearbox
    - Linear actuators have no give. So landing on the forks meant the forces had to go somewhere. Generally into bending the forks

    So after getting my axe robot into a working state, and learning a bunch from steel chassis bots, I have decided to build a new Spur imaginatively called Spur II

    I wanted to keep the bot nice and small. This allows me to use weight in a more flexible manner.

    Key objectives
    - good traction
    - protected wheels
    - strong lift but able to withstand shocks i.e. flips
    - able to go full combat

  2. #2
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    Steel is more unforgiving so went for drawing and templating the steel before cutting




  3. #3
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    So this is the basic layout



    Its tight inside but enough space for the important bits

  4. #4
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    I've got the steel templates cutout

    Currently 4mm Hardox sides. The chassis plate is 3mm but looking to move to 4mm as well




    Just need to buy a welder to put it together

  5. #5
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    The lift motor is from an AEG 18V cordless drill I picked up cheap from ebay
    Its a monster but the gearbox is 2 speed and general quality seems very good
    I'm building this on a self contained frame for maintenance. It will chain drive the front end lifter mechanism


  6. #6
    plargen's Avatar
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    have you left enough space for the esc's

  7. #7
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    Yep - 3 TZ85a. They line up nicely under the battery
    I might move one under the lifter motor. Enough wiggle room to decide in a bit

  8. #8
    Eventorizon's Avatar
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    How is the AEG 18V getting its power to the forks? There seems to be very little space

  9. #9
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    Chain and sprocket

    A 14 tooth sprocket on the motor (welding onto the shaft)
    The lifter will be a 17mm shaft running in needle bearings with sprocket welded on there again

  10. #10
    Max's Avatar
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    So will the chain go around one of the Gimson drive motors?

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