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Marui Super Wheelie and Big Bear - a project including CAD

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Marui Super Wheelie and Big Bear - a project including CAD

Old 08-17-2023, 01:57 PM
  #61  
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Work continues...

I assembled bodyshell, dashboard and windshield...



And since my target is a printed body with leds, I did that as well for my own body...


Then I prepared a roll cage compoenent allowing for leds. The leds will be locked with a small screw (M2x8)...



I put the locks with the roll cage so they can be printed together (possibly TPU, as the integration of the lights in the middle bar makes requirement for flexibility)...


I also made a version of the body with leds and roll cage part (I've not decided yet if I'll use it)...
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Old 08-18-2023, 10:42 AM
  #62  
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Some chassis parts printed in MJF PA12 arrived today...


I've already done some checks but without pictures so you'll get the results later :-)

In the meantime I've done the remaining clusters...


One for the Big bear front arms ready for shocks and another one including all the parts required for shocks enhancement with drilling template for my enhanced chassis (and also one with drilling templates for the stock chassis).

Ultimately, that is a lot of parts!


Next step : Sunday or Monday, with official test fit of all those parts...
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Old 08-20-2023, 01:02 AM
  #63  
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Fitting test, phase 1.

Enhanced chassis :
1. with Big Bear original body, all good



2. with Land Cruiser original body, all good



3. with CJ-7 Golden Eagle body, all good





Gearbox halves : All good!







Printed gearbox with original arms : check!



Printed motor cap with original arms : check!



Printed brushless motor cap with original arms : check!



Printed arms with original gearbox and motor cap: check!




I have no doubts on the front arms as I have a running set already on the Super Wheelie which ran at the vintage events...

In short : all good. The internal gearbox was already tested few weeks ago, and it led to a minor change which was not printed. The change will be replaced by a shim washer in the build but I have o doubt it will work... I've not conducted MJF PA12 print test of the Big Bear arms, but their key features are the same as the Super Wheelie arms, and it should be fine...

TLDR : All good! Next will be chassis build :-)
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Old 08-26-2023, 10:26 AM
  #64  
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While awaiting the prints to attack the build, I'm taking care of the parts which are not dealt with using MJF PA12. There is some light glasses I need to print in flex transparent resin. I have some Liqcreate Elastomer-X. Initially I took it as I thought about being a solution for colored tires, but the issues I have with the Liqcreate Flexible-X have put this idea aside. I thought this could be now a good application.

The first print was 50% failed, and I don't understand the reason. The second turned better and I did not change any settings in between. The two glasses of the first print are already cured, it yellow a bit, but that should not be much an issue for my application...


I did 5 minutes UV cure in a jar of water, and then 25 minutes out of the water as prescribed in the information provided by Liqcreate...


Last part I need to take care is the windshield glass... I plan to cut some acrylic sheet with the Silhouette Cameo 4 to address this, and I'm eager to start the build...
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Old 08-27-2023, 10:18 AM
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This afternoon, i tried to export a dxf from Fusion360 to transofrm it in png, and it did not worked the way I wanted. I finally took a screenshot of the windows profile, and redimensionned it in Silhouette Studio, set the sequence of cutting : first pass for the holes, second for the glass surrounds...

And tada...


Why so many? The sheet is 200 microns, and I'd like to have just a bit more, and I decided to cut 3, and more just in case... Anycase, this worked well :-)
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Old 08-28-2023, 11:25 AM
  #66  
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This Marui Super Wheelie project started a bit more than 8 monthe ago, when I started to model the chassis… It was lot of fun, and having both 6V and 7.2V chassis, the bodyshells, I wanted to have the Mitsubishi unreleased body as well… Modeling it was fun, but I wanted one I can run, so the stl were done, and the printing is ongoing… And the story continues…

Two years ago, when I started the Marui Hunter project, one guy based in Australia, Johann (a guy on a forum) proposed me some stickers for my Hunter (he was working on a similar project at that time), and few weeks later, I received stickers in my mailbox. And Johann became a friend… He knew I was modeling this car and that I had the intention to print it, and during a discussion, I asked him if he was able to draw the stickers, and if he could share with me the graphics so I can do the rendering...
He did, and although there is still some work to do to get some proper sizing, and the limitation of Fusion 360 making it difficult to get it assigned to faces… The “Bouncing Billy” driver name was added within the process to add some personality to the car, based on an idea taken from some comments on one of my facebook publications, and I really like it..




And when we work out renderings from there…





Obviously the sizing won’t be perfect until I get a body printed and the exact measurements done with the stickers, but it already looks super nice… I’m already super happy with the result :-)
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Old 08-31-2023, 12:51 PM
  #67  
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I'm eager to start the real thing... Printed parts are on the way, as well as some specific hardware to complete the set...

Today, some of the stuff arrived.


The stickers sheet is a PDF I printed to check the sizing as soon as I receive the printed parts...
A major part of the hardware is there. Missing stuff should arrive by Saturday.
The Bumper fixation is sorted as I found some Springs with the same internal diameter than the orginal ones (the wire is having a smaller diameter but that should not be an issue). They fit perfectly and they will do the job. I just had to recut them to make them slightly shorter.

Very difficult at this stage when the last set of printed parts will arrive, all the more so as they did not go the same route as previous shipment from the same manufacturer... The latest will be next tuesday, but I really hope it will be earlier. Crossing fingers :-)
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Old 09-01-2023, 08:20 AM
  #68  
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The final set of prints arrived this morning...


All those parts look nice, and that is good to get into reality... I was a bit scared for the body part by the print provider team during the validation of the files as they mentioned warping and aspect risks during the file validation stage... But it looks good...



And i'm very happy with the dashboard as well... Man, I want to tune this radio :-)


The ifrst thing I've done during my lunch break was to check the sizing of the stickers so Johann can eventually modify them...





I also put the body on an original chassis, and it fits perfectly...




There is a few parts I still want to print, for some reasons... :-)



I intend to get the prints done over the week-end... The build itself will probably happen tomorrow for the chassis. I'm still undecided at the moment regarding bodyshell paint or not... I may have a window to paint it tomorrow, but do I want this is a good question :-)
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Old 09-02-2023, 06:08 AM
  #69  
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There was no way I would even think one second to run this project car with original tires (not that I don't have some)... But for the fun, it has to be printed tires (and because I would always think the project is not over if I don't do it this way)...

So I took the same resin as the one I used for Samurai and Ninja tires. I think it is slightly on the hard A shore side for this usage, but since I could not have successful prints with the other resin I tried (plus they fact that the rare success tend to be tored too easily), I have no real choice...

The printer worked since yesterday, and I think I have now the right way to do the post process (rear side is still bad, but front is nice)...

Here is the result (2 other tires will be printed this afternoon)...



You may notice the very different profile for the tires between the rear (thought for the rigid axle and almost flat) and the front (thought rounded to ease the turns). I've tried to be consistent with original tires thread thickness as the front thickness is higher than the rear, probably to give more weight to the front...

And next to original tires (partly depleted) on one of the Super Wheelies (the test rig for the transmission), here is the pic...


In terms of parts I still need to print rims and internal locking rings... And unfortunately, it seems the body mount didn't arrived today as I expected...
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Old 09-03-2023, 12:21 PM
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And finally, the rims are printed...


Trying to include a ring (TPU printed) in the Hunter tire turned to cut the tire, so I'll try first to run those tires without (the pilars used for the impression will somehow replace the ring, that may be sufficient)...
I will need to prepare a group picture of all the parts for the build (hopefully, the missing bdoy mounts will be here tomorrow - they are the actual reason of the delay)...
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Old 09-04-2023, 02:31 PM
  #71  
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I had to wait all the parts being here to do this before I start the build...


That being said, it's a bit late tonight, so the build will start another day...
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Old 09-06-2023, 10:08 AM
  #72  
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Time to build, we said...

Time to start with the chassis, and particularly with the shock mods. The chassis do not include the holes for this, as I wanted to have the possibility to get it in a standard fashion, and the shock mods being a mod experience rather than just an add-on. The shock mods cluster includes 2 parts designed to define the holes positions in the chassis (I may also provide a version working for original chassis but it is yet to be decided)...


The two parts are lining up with the existing holes in the chassis making the lining easy to deal with...


The chassis being ready, it is time to get the parts for the front train... The main shaft and the springs are the only part that can't be easily replaced. I could have replaced the rest, but it happened that I have enough to cover this car with parts available in my stash without issue to rebuild the cars I have to rebuild...


The fornt suspension cluster I'm using is the one shocks ready which include hook for the pivot ball to attach the shock.


I'm using the original spring and shaft to keep the range of the front suspension. The use of the mini CVA requires this, as otherwise, the spring cup on the shocks reduce the range for suspension shock...


The servo is fixed on a Big Bear fashion, with a servo saver that I had sitting there, and the front shock extension is sitting in place


Next is to add the shocks...


Then it is time to get to the gearbox... The gearbox is on steroid, with ball bearings, brushless, strengthened diff, and SLM stainless steel printed idle gear...


Very quickly the gearbox is almost complete. It is missing the rolls for the wheelie bar, but I'll tackle this later... The hooks for the pivot ball replaced the one from the arms cluster, and they are part of the shock mods cluster...


Next step was to fix the gearbox to the chassis... Again, the range of the suspension is the same as the original chassis with springs (on the bottom it is limited by the chassis)...


The ESC finds its place under the rear suspension brace (which I believe is required due to the mods to reinforce the chassis). You may note the room for the battery pack slightly more accomodating than the original chassis, allowing for 138mm length packs and the holes to facilitate the wire management when we run the car... The body mounts are Tamiya hex body mounts...



The chassis is almost ready. I still need to find the proper allen key for the non standard M2x8mm screws I have in my stash for the rims assembly...

Next is going to be about the bodyshell...
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Old 09-06-2023, 01:00 PM
  #73  
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Wheels and bumper added to the chassis...

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Old 09-07-2023, 12:17 PM
  #74  
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The body is assembled... It is quite a chore to do it, because of the different screws diameter and length involved... And I noticed some minor mistake I'll have to correct on the rear faces of my bodyshells due to the screw sizes...

Some parts are not yet bonded, and the rollcage doesn't include the lights yet, as I will need to digg ga hole somewhere and I don't know where yet... I'll do this after I paint the body...






And with lights on (Still need to find the proper room for the circuitry...






I'll see when I can paint the body. The car won't run until next year when it is sloted as part of a proto contest in one of the vintage events we have here in France... The stickers are not there anyway, so this will take time... In the meantime, I'm super happy as this car looks good in real too :-)
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Old 09-08-2023, 10:57 AM
  #75  
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I tore down the bodyshell to parts as I need to prepare the paint...
Doing this, I was thinking that maybe I want to keep the original aspect for inside the car, which would mean masking in the proper way... Liquid mask maybe?
In the meantime, I decided to reprint the fog lights glass, in ABS transparent (or transluscent)... It's better as they don't tend to move out of their position. I did them to be snapped on. And it works well. I may have to make the KC sticker transparent somehow (or just cut the letters)... I may follow the exact same approach for the front, as it is going to be looking more like box art (I can definitely pull a box art for this one, as I'm sure that noone will use the same box art fashion than me (at least for now, except maybe down under, but at least it won't be on the same track :-) )...


The only elements I may keep the way they are currently for the accessories are the roll cage and the winch (I may use molotow liquid chrome to highlight the wire, the hook and the switch) and maybe the jerrycan... If the inside of the car is kept the way it is, the dashboard inside face also need to be kept this way (the plastic maybe slightly too modern for a Mitsubishi Jeep, but most European cars had already plastic dashboards in 1980), and I would only detail what is needed...

Now what is the best way to mask? I don't think frogtape or other masking tape would work. May be liquid mask would work...
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