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Scale 4x2 and Buggy R/C vehicles This is the place to put your Sand Scorchers, Bajas and other various 2wd offroad R/C's


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  #16  
Old 06-04-2016, 04:24 AM
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Originally Posted by marzo View Post
ah ah
thank's

i love also sand scorcher

http://www.scale4x4rc.org/forums/showthread.php?t=76443

.
Hey marzo - great build - and a touching tribute, your skill at building parts by hand from scratch is very impressive !, Sadly, I have to rely on computer skills - and technology.
I do attempt a painted finish though, coming up,,,
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  #17  
Old 06-04-2016, 04:49 AM
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Default Junkyard Stance, Sand Scorcher paint job, first layers

Time to get some paint on that shell,,,

First, two coats of gloss black, acrylic primer

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(Mental note, Scorchers look way cool in black),

Then a coat of metallic acrylic all over, and once dry, two coats of satin acrylic varnish.

Then I start to mask off individual panels

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On this build, I'm going for a junkyard, rusty look with peeling paint and some bare metal showing through. So, I'm painting some of the panels slightly different metallic shades, by masking other panels off before spraying:

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Some parts of the shell are masked of just using a cut stencil:

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The results, an undercoat of metal panels to work up my junkyard look on

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I finish this paint stage with a another couple of light coats of satin acrylic varnish - I spray in my garage where it is quite damp, this often results in white watermarks on the varnish layers when dry. A light rub with a cloth with a touch of olive oil should remove them,,,
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  #18  
Old 06-04-2016, 05:30 AM
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Default Junkyard Stance Sand Scorcher, LED lighting on the front

So, back to replacing some of those standard Tamiya parts that fall into my " could do better " category- Front lighting - Here's my plan

A hooded-lid design for the headlamp that can hold a 5mm LED, and a replacement for the indicator/side light that can hold a 3mm LED - both should hopefully use that standard clear plastic "glass":

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And the effect I'm going for:

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Here's the printed headlamp in white nylon:

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And round the back with the fitting column, and LED holder:

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The standard "glass" is a snug fit but eventually went in - top part first under the lid, then with firm pressure on the front of the glass, it went in with a reassuring 'click'

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The side light part needed a light scraping with a scalpel to clean up some residue, but, again with a tight fit I eventually got the small clear plastic part in (I'm going for a tinted, black-out look to the the "glass", this was my first test with a mostly smoke , plus green/black acrylic mix):

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The headlamp with 5mm LED, in primer:

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And the LED in place, round the back:

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  #19  
Old 06-04-2016, 06:11 AM
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Default Junkyard Stance Sand Scorcher, LED lighting on the front

Fitting my headlamps does require drilling a 6mm hole directly in-between the fixing hole and the bottom of the back-face .

So, a small pilot hole first:

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Then, I plumped for a 6mm wood bit:

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I went in from the front - I thought perhaps a bit too high at first:

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But from round the back, although I shaved the fixing post, the fit was good

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and from the from the front, the hole was quite tidy:

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The other side didn't go quite so well !

To Fix, I used two M2.5 6mm screws, with wahers:

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Lights in place, with blacked out glass fitted, I'm liking the effect

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With the LEDs on - surprising hard to photograph in the daylight - I'm reasonably happy with the results ( the right one went in a bit wonky )

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  #20  
Old 06-04-2016, 07:11 AM
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Default Junkyard Stance Sand Scorcher, LED lighting on the rear

As you might have guessed, I'm adding a Tamiya lighting unit to power the LEDs, and with eight sockets available, I need to maximize my lighting on the rear

I'm planning a replacement cluster on each rear wing to hold a red, orange and white 3mm LED, and a replacement for the light holder over the license plate, with holders for two white 3mm LEDs

Here are my designs:

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And on my 3D Scorcher:

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Here are the 3D prints for the rear light cluster, with a printed clear acrylic part for the "glass"
( the unused Tamiya item that comes with the kit were just a touch small small too allow 3 LEDs - shame )

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And the LED holder for the license plated light, which looks pretty much like the stock item:

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But round the back, room for two 3mm LEDs:

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  #21  
Old 06-04-2016, 07:24 AM
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Default Junkyard Stance Sand Scorcher, LED lighting on the rear

I painted the inside of the clear acrylic part with a smoke plus green/black acrylic - inline with my blacked out look for all the glass on this Scorcher

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and painted the white nylon part with a primer, then metallic, the varnish

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The fit of the license plated light holder was good ( on the third attempt ! ), here's the results of much tweaking of a curved part on a curved surface:

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and from underneath:

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It attached using the stock hole, I've used an M2 5mm button cap

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I couldn't wait to test the rear light cluster with some LEDs - the holes needed slight cleaning up with a sharp 3mm drill bit until the fit was snug

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and flip that switch,,

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I was concerned my blackout on the glass was a little too much, but the effect was cool:

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So on they go,,,
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  #22  
Old 06-04-2016, 07:33 AM
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Default Junkyard Stance Sand Scorcher, LED lighting on the rear

To fit the rear light clusters, I'm using the stock locating holes as my fix points,

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with two M2 6mm button cap screws:

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After fixing loosely - before drilling, the part won't sit flush - I marked the top and bottom hole points

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and then enlarged with a 5mm drill bit

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and then cut away the material in-between

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This allows space for the rear of the part, and it then tightened flush

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The results of my rear LED holder, trying to stay true to the original sand scorcher, but should allow me to light up on nighttime drives:

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  #23  
Old 06-04-2016, 08:16 AM
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Default Junkyard Stance Sand Scorcher, louvered rear sun shade

With my lighting taken care of, for now, I kept looking at that front sun visor, thinking what could I do on the rear of this Scorcher. A cool 70s looking louvered rear sun shade ? too much ? Na, never too much

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My design includes a hinge, so I could flip up the shade enough to access the release for the body shell - and a part that replaces the two stock Tamiya spacers that sit between the body shell and the metal catch.

Firstly, I wanted to test fit a "snap in" version to test the accuracy of the rear window frame on my 3D model -

Here's the snap on prototype:

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The fit was reasonable, so I made a few minor adjustments, added in and extra slat at the bottom, and pushed ahead with the hinged version:

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Unfortunately, instead of getting closer to a snug fit on the the window frame, adding the hinging mechanism made the fit somewhat off when closed

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It did open nicely though

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More tweaking, and my for I next attempt, I tried a new version of the printed nylon material, allegedly black, but appears to be the white which has been subsequently died black after printing

Still looks way cool when open:

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But now it won't even close at all !

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And looks well off from above

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I could see some thinking was needed on how to achieve accuracy on a square with rounded corners, that curves in two different directions,,,
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  #24  
Old 06-04-2016, 09:41 AM
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  #25  
Old 06-04-2016, 10:01 AM
Trini2DBone Trini2DBone is offline
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Holeee crap!!! I love this!! Genius work on the added bits...outstanding no doubt!!

Subbed!
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  #26  
Old 06-04-2016, 10:43 AM
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Holeee crap!!! I love this!! Genius work on the added bits...outstanding no doubt!!

Subbed!
Hey, Thanks Trini2DBone !

I promise we'll get to something a little more exciting that replacement bits soon ! (What kind of engine does this junkyard build need, me thinks) - thanks for the sub,,,
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  #27  
Old 06-04-2016, 10:45 AM
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Hi marzo, thanks for checking back - the build is still some way ahead of the photos, still more to come
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  #28  
Old 06-04-2016, 11:11 AM
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Default Junkyard Stance Sand Scorcher, Cast alloy wing mirrors

We're nearly at the point where I will stop grumbling about Tamiya stock parts and get on to something more exciting, but not quite.

The wing mirrors ! Pretty flimsy and naff looking. What would be cool is a robust, cast metal part that uses the original mirrored plastic and fitting, won't break the first time you put the shell on it's side - and one that looks a bit more, well,,, scale

Here are my plans:

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And on the 3D Scorcher:

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Before trying a cast metal part from Shapeways for the first time - it is 3D printed in a waxy resin material, which is destroyed when it is then used as the cast for the alloy part - I decided to test my prototype in another new print material - Frosted Ultra Detail:

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It looked great, with superb detail, but a lot more brittle that the nylon.

The part broke the first time I put the body shell on it's side

It did, however, survive long enough to know the fit was good, and I ordered the cast alloy wing mirror - in what Shapeways call "Polished Black Steel"

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The tolerances in the metal part is slightly different, with the minimum thickness going up from .7mm ( on the nylon ) to 1mm on metal parts.
The surface id also slight rough and pitted, meaning the Tamiya mirrored plastic part needed sanding round the edges to fit:

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It went in with a little coaxing

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I used the original rubber O ring to fasten, and although it would come loose with rough treatment, is pretty firmly fixed in place to the touch

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I got quite excited at ths point, happy with the results, so "mirrored" - excuse the pun - the part in the 3D software I use, and ordered the other side !

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  #29  
Old 06-04-2016, 11:15 AM
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Default Junkyard Stance Sand Scorcher, Cast alloy wing mirrors

On the Scorcher body shell, I'm pleased - after the trickiness and disappointment of my louvered sun shade ( not giving up ) - it was nice to have a design go smoothly

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  #30  
Old 06-04-2016, 11:35 AM
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Default Junkyard Stance Sand Scorcher, wiper blades - with fins !

While were at it, we might as well do the wipers,,,

Adding the fins give me that retro look I'm after:

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The nylon prototype was made with a 1mm wall thickness - the minimum for a cast alloy part:

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After a tweak to the angle the wiper sit at, onward with the cast alloy wiper blades

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Of course, you need two for a sand scorcher

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And on the body:

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