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Thread: Team Health & Safety - First Time Builder

  1. #91
    Zenith's Avatar
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    Greg Cathalina
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    This Is Not A Drill (BW)
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    Here's the event compilation! Actually struggled getting most of it in there - had to cut some stuff sadly...


  2. #92
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    James Davis
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    Good compilation, I enjoyed watching it

  3. #93
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    Greg Cathalina
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    Thanks! Since I seem to build something new for every event I think it's nice to see everything that transpired before getting there.

  4. #94
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    Greg Cathalina
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    Alas here we are agaaaaain!

    On Bright Day the first fight pretty much sealed the fate of This Is Not A Drill's second version, when G2 saw fit to completely remove part of the chassis. This meant that another rebuild was in order.

    Roll on Mk3!

    For this new version I wanted to change several things:
    • finally and definitively make the switch to 4S
    • revert back to Mk1's wedge mount design to make the chassis shorter and lighter
    • change the motor mounting system to facemounts, also to reduce weight
    • moving the lifter slightly forward
    • moving the lifter motor forward
    • slightly increase the width


    Quite a few changes then, and last week I started making the drawings for the new version. There were quite some similarities to Mk2, but I guess I'm tentatively approaching the stage of where the design is honed and perfected rather than COMPLETELY BINNED BECAUSE SCREW THIS.

    Now, I have not got any events planned in the near future, but building is sort of my jam so forgive me to roll on the bread and LAYOUT THE TABLE.

    IMG_20171207_113824.jpg

    Breakfast is served. Most of the parts visible will either find their way into Mk3 or a different bot. Drawings were done quite swiftly as well - as it is, the only thing inherently different in the new chassis is the way the wedges are mounted so I only really had to redo the side pieces.

    Well anyway, a day after I had done the drawings I suddenly found myself staring at this:

    IMG_20171210_152812.jpg

    Old vs. new, obviously. You might notice that from the old chassis the front cross member is missing - this is simply due to my obsession to be Terry Treehugger and recycle old parts.

    IMG_20171210_115613.jpg

    You see, looking at the front cross member from Mk2 (pictured here left) I noticed it could very well fit in the new chassis with some adjustments. To the right you can see a part which was actually meant for Mk2 but was put aside when I decided to slim down the Mk2 chassis. Now that I'm going to make the chassis wider again, I can use the part... let this be a lesson that you should never throw away parts you might still be able to use at a later stage.

    The Mk3 chassis goes back to the concept of securing the inner mounts through interlocking them.

    IMG_20171210_153023.jpg

    Here you can see the part in question...

    IMG_20171210_165531.jpg

    ...and this is how it looks assembled. Progress is quite quick actually, so I'll get the next installment out you ASAP. For sneak peeks there's ofcourse always the Facebook page, but if you don't care for this shameless attempt of self-promotion that's fine too.

    Cheers!

  5. #95
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    Greg Cathalina
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    Building is my jam, and I find myself most decidedly on a roll here. Who's hungry?

    After getting the outer chassis sorted, I wanted to focus on the inside. I could actually still use the old motor bracket from Mk2 but as I wanted to move the motor forward, I needed to make a new one.

    IMG_20171211_160526.jpg

    I decided to experiment. Instead of going to 10mm-block-of-HDPE-paintstakingly-carved-from-a-15mm-sheet route I chose to use two 5mm pieces and add some shockproofing inbetween. I'm curious if this will improve anything, but it seemed to fit quite snug.

    IMG_20171211_164817.jpg

    Further improvements are the 'G2-prongs' I added to the baseplate, to further secure the wedge mounts from being ripped off by a freak spinner accident. Yes, famous last words and all that, but you have to give it all your best shot AMIRITE?

    IMG_20171214_105120.jpg

    Next up, the top plate. It requires a slight bend because of the shape of the chassis, which requires me to first mark the holes, then bend it, and THEN drill the holes. If you drill the holes beforehand you run the chance of warping them when you heat the HDPE.

    IMG_20171214_113236.jpg

    Then time for some more Cardboard Aided Design to get the slot for the lifter cam lined up...

    IMG_20171214_114448.jpg

    ...and there we are. As you can see though, the lifter is still quite far from flush with the ground. This is due to the lifter cam still being unmodified from Mk2, and with the lifter motor going forward, the cam was now too big.

    IMG_20171214_120012.jpg

    Some grinding later, all was well again. The front can be raised 5mm and the lifter blade will still be flush - good stuff then.

    IMG_20171214_120028.jpg

    And just to be safe, a check for lifter reach. This is the lovely thing about having a motor-actuated lifter - I just put the cam onto the motor mounted in its bracket and turn the cam as far as it can go. Voila, max reach.

    Seems alright to me.

    Check back soon for the next installment where I'm going crazy with wedges and stuff!

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