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Leiywens/Drews F.I.S.S v2

Discussion in 'MS' started by Drew, Jul 30, 2017.

  1. Drew

    Drew Carbon Fiber Dust

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    So I'm upto the point where I'm now waiting for the front/rear stay parts to arrive to go further.
    In the mean time, I was curious what you guys think about the rear stay?
    The front needs to be damper because that's used to actuate the steering. But the rear wheels need to be held straight.
    So do you think I should add a damper stay at the rear or just a static stay?
     
  2. Drew

    Drew Carbon Fiber Dust

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    Update:

    Stage 3 complete....?
    Will change a couple images once I've locked it down after replacing a couple parts, but it's done.
     
  3. Drew

    Drew Carbon Fiber Dust

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    Update:

    Stage 3 finished.

    Started stage 5.
     
  4. Drew

    Drew Carbon Fiber Dust

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    Update:

    Stage 5, stays and steering are all done. I've added the video to the post, but here it is again for who ever is notified here.

     
  5. Drew

    Drew Carbon Fiber Dust

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    Update:

    Stage 6 almost complete, just needs a fresh paint job to finish. Hopefully I don't screw that up.
    But barring that, she's all finished.
    I hope you guys like the build.

    Oh....I should probably do a drop test video, but needless to say....she don't bounce at all.
     
    warwick likes this.
  6. Drew

    Drew Carbon Fiber Dust

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    FISSv2 doing some drops. I've also posted it to the stage 6 post. Drop height was about 18".

     
  7. Drew

    Drew Carbon Fiber Dust

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    Hmmmm....finally finished painting the car....and I'm not entirely satisfied with it. I got a little lazy and now it looks like some space craft from an 80's sci-fi show or game.

    Anyhow, here's the finished pics....

    IMG_20170924_140912.jpg IMG_20170924_140854.jpg IMG_20170924_140812.jpg IMG_20170924_140755.jpg IMG_20170924_140742.jpg IMG_20170924_140726.jpg

    There's definitely things that need reworking, doing better. I'll make a list here should I choose to revisit this or whatever.

    *Rubber tube on uprights need making better/better positioning.
    *New wheels (could have trimmed them better and front right is very loose due to accident).
    *Better FRP for the rear wheels positioning piece (that's right, the little frp dicks).
    *Shock mounts on uprights need changing (for MS brake part).
    *Better dock cups for the drive train?
    *Also maybe better dock rods? (brass came off two of the rods).

    I think the rubber tubes and upright shock mounts are the two that really need looking at the most. As for videos of it running on the track, I really want to, but the car is literally barely within tamiya specs and the lane on my non-tamiya track is too narrow that going around the corner causes the inside wheels to rub the wall (left hand corner = left wheels hitting the wall) and causing the cups to come off or break due to friction/heavy braking effect. I tried twice to run it on the track with the same thing happening each time and wheels coming off. It did manage to make two laps before the wheels came off however. I guess if or when I get some proper spec track, I'll try again.

    All said and done, the suspension works (the front needs looking at though since it's not returning to rest properly) and steering also works without throwing the rods. So I guess I can sum up that it is a successful build, if rather on the heavy side.


    Anyway, it's done, for now I guess. You guys let me know what you think of this build, would very much love to hear.
     
    warwick likes this.
  8. celt63

    celt63 Lock Nut

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    Very cool Drew.
     
  9. Drew

    Drew Carbon Fiber Dust

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    I've been thinking back on this build, not sure if I want to try to rebuild it sometime or just recover the parts. I'm leaning towards recovering the parts since it's not a very practical build.
    That said, I wasn't quite down with the shell also, so I've taken it off, cut it and need to respray it, but here's an idea of where I'm going with it.....

    The alien squid looking thing:
    IMG_20171216_221918.jpg

    Or flip it around and keep it looking like a space fighter:
    IMG_20171216_221828.jpg

    I'll figure something out with it, but it won't be going back on this car.
     
  10. Drew

    Drew Carbon Fiber Dust

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    I've decided I really dislike this build, so I've stripped it down and going to rebuild, hopefully with a better method.
    I will be saving these parts to use as the base since they're already prepared:

    IMG_20180118_231323.jpg IMG_20180118_231334.jpg 20180118_161714.jpg


    What I've been looking at doing is changing to this:
    IMG_20180118_230429.jpg IMG_20180118_230357.jpg

    This is just an idea I started with using a 1.4mm propeller shaft, it's a little tough to bend, but I'll work it out. As for the wheel mount, I'm not thinking of using the steering control, instead I will use the wide tread from the MS bumper pack, cut the post holes off and screw in a pair of ball links. Using the wide tread, I can make a hole in the back for a second bearing to stabilise the wheel axle. Tomorrow, I will try a test cutting of the ball link to see if it's possible to make it like above.

    IMG_20180118_230734.jpg
     
  11. Drew

    Drew Carbon Fiber Dust

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    So I've tried to prepare a ball link to see if it's viable, a bit messy, but it does work. It does clip in, so I'm definitely going to go with this method. Going to need to buy more ball link damper sets and a few packs of propeller shafts.

    IMG_20180119_165404.jpg IMG_20180119_165423.jpg
     
  12. Drew

    Drew Carbon Fiber Dust

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    Been doing a little more one this whilst waiting on parts for the other cars.

    Using the same plastic mounts from the MS brake kit I've been using in all the builds.
    I've drilled out 3.2mm hole in all of them and fitted the 3mm rubber tubes. The swing arms fit perfectly into this.

    IMG_20180225_222025.jpg IMG_20180225_222059.jpg


    The swing arms and wheel mounts in order: Front side, rear side, close up of ball link.
    Used the wide tread axle mounts from the reinforced MS bumper packs, 6mm bearing, propeller shaft for the swing arms, metal ball links, plastic ball link connectors and 6mm alu spacer for axle stabiliser. The way this is made allows the wheels to just clip on/off for easy maintenance/cleaning.

    IMG_20180225_221457.jpg IMG_20180225_221623.jpg IMG_20180225_221502.jpg


    I haven't finished putting it together yet, still need to trim the propeller shafts. But here's an idea of what it will look like.
    This is the method I wanted to use at the very beginning of getting back into mini4wd, just took a little while to get knowledge of the parts you're limited in using. It looks a little long, but that's just a camera issue I hope.

    IMG_20180225_220749.jpg IMG_20180225_220819.jpg IMG_20180225_220854.jpg



    Edit: Just assembled it temporarily to test. I did demonstrate that it's possible to do steering but I'm going to not do that this time round.

     
    Last edited: Feb 25, 2018
  13. Drew

    Drew Carbon Fiber Dust

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    Ah, spring is finally arriving:


    IMG_20180226_164355.jpg

    Or it should have been...anywho, did some more today:

    IMG_20180226_163925.jpg IMG_20180226_164000.jpg IMG_20180226_163541.jpg IMG_20180226_163549.jpg
    IMG_20180226_185801.jpg IMG_20180226_185729.jpg IMG_20180226_185718.jpg IMG_20180226_185846.jpg IMG_20180226_185817.jpg IMG_20180226_185828.jpg IMG_20180226_185555.jpg
     
  14. Drew

    Drew Carbon Fiber Dust

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    Switched the inner screws for 40mm screws or what ever the largest ones I had were.
    I couldn't figure out how to mount the shaft stopper for the shock, so I figured I'd use the longest screws I had and just bend them to fit. Came up with this, looks a bit messy but meh...

    IMG_20180227_171143.jpg IMG_20180227_171153.jpg IMG_20180227_171209.jpg

    And a small demo of it working.
     
  15. Drew

    Drew Carbon Fiber Dust

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    Just a little more on this build, added some stays and rollers, still waiting on a few more things for suspension and wheels.

    IMG_20180303_171355.jpg IMG_20180303_171426.jpg IMG_20180303_171411.jpg
     
  16. Drew

    Drew Carbon Fiber Dust

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    Got the shaft stoppers and wheels, so did a little more.

    IMG_20180312_170615.jpg


    Need to trim back the wheel axle and chassis cups before I make the new cups for the wheels and dog bone.
    IMG_20180312_170648.jpg

    Also planning on changing the shock mount from using a twisted screw. Got a couple more packs of MS brake set coming for that.
    Overall it's starting to come together. Also want to replace these threaded shafts as they're all different sizes. So still quite a bit to go.
    IMG_20180312_170806.jpg



    Here's a few to see what it would look like finished.
    IMG_20180312_171121.jpg IMG_20180312_171022.jpg IMG_20180312_171056.jpg IMG_20180312_171111.jpg IMG_20180312_171209.jpg

    I've wanted to tuck the suspension in behind the wheels, but it's easier to make the shock mounts on the opposite side and opens up more ways to deal with lack of space.

    Still more to do, but I'm enjoying this build, far more than the previous F.I.S.S builds.
     
  17. Drew

    Drew Carbon Fiber Dust

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    After trying to make some dog bones, I've come to the conclusion that I'll have to start this build over again. The swing arms are a little offset to the drive gear and the dog bones are far too small. I think I'll have to look to how I originally did the transmission on the v.1 build, that gave a lot more room for a longer dog bone. I also want to make new wheel mounts using a slightly different method, they'll still be largely the same, just trimmed a bit different and a rubber wall added to them. Back to the drawing board I guess. I need to replace a few other things first (new boots, new phone, new audio for pc), so I'll probably not be posting as much right now.
     
  18. Drew

    Drew Carbon Fiber Dust

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    After months of inactivity on this one, I've finally stripped it, then I've shortened the drive gear shaft and decreased the width of the cups, a gain of about 5mm on each side. I also decided to change the middle chassis because I noticed a few cracks starting to appear on the previous chassis.
    I'm getting new propeller shafts to make new swing arms.
    It'll probably be weeks or even months again before I get back around to it.

    34380976_222158355256403_109080890734280704_n.jpg 34407279_222158348589737_5416561489538449408_n.jpg
     
  19. Drew

    Drew Carbon Fiber Dust

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    Been trying to finish this for over a year now, it seems like every time I put it aside and come back to it a month or more later, it feels like things just start going wrong.

    The chassis and gears are fine, but the suspension just don't feel right and neither do the upright mounts. If I wanted steering, these mounts would be fine, but if I want it rigid, it's just not working out as I had hoped. I just can't seem to stop the wheels from turning. I could make an frp spar to keep them from turning I guess, but it's all these little things that just make it feel like it's getting worse and worse. The shock is also another good example of this, after finding a way to install the shocks, now the batteries won't go in.

    The wheels are still not properly aligned with the drive shaft, but that's because I just tried to rebend the previous swing arms rather than make new ones, but they're a lot better than before.

    So the short list of current issues is this:
    The wheel mounts need something to prevent them turning or make a steering mod.
    The dog bones still need pins.
    Find some way of mounting batteries.
    Replace on of the swing arm clips that holds the upright, it's become too loosened.

    I don't know, maybe I'll just scrap this and start over, really not feeling this project any more right now, when I started it I didn't even have much of a plan so I was just winging it, I just want it done and over [​IMG]

    20180615_173918.jpg 20180615_173930.jpg 20180616_190355.jpg 20180616_190426.jpg 20180616_190444.jpg 20180616_190450.jpg 20180616_190529.jpg 20180616_190552.jpg 20180616_190624.jpg 20180616_191535.jpg 20180616_191552.jpg 20180616_191601.jpg
     
  20. Drew

    Drew Carbon Fiber Dust

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    So I decided to just plough through on the MS, just so I can finish making the dog bones and see if I needed to change the cups on the wheel axle. I've been able to power it up and find the problems which were as expected.

    The cups on the wheel axle do need changing for longer cups.
    The wheel mounts/uprights need changing, they're not holding as stable as I had hoped.
    Other than this, it's just about working. Although I'll want to rebuild again at some point and make it look a whole lot cleaner, maybe change the suspension/swing arm layout a little bit.
    I think I'm finally on the edge of finalising the build.

    Anyway, the video is still going to take a while, so I'll post that later. For now, here's what I want to do with the uprights. It's not changing them too much, it's more just adding a frame with a much more secure mounting point for the swing arms. The stud will go through the hex spacer, I just haven't drilled any hole in it since I was checking. The ball stud will hold the mount to prevent turning and act as the shock connection point.
    By using 3mm carbon frp, I can drill a 1.4mm hole that the shaft will fit perfectly without wiggling around. The down side is needing to bend the propeller shaft after inserting it into the carbon.
    20180618_174318.jpg 20180618_174333.jpg 20180618_174356.jpg 20180618_173733.jpg 20180618_173740.jpg 20180618_173902.jpg 20180618_173908.jpg
     

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