Heavy Haul

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astecme
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Heavy Haul

Post by astecme » Sun Mar 10, 2019 3:40 pm

I was going to build a new truck but the bits are missing so chad a change and will now build a heavy hauler first.

I was in two minds as to whether this is Tamiya or non Tamiya but put it here as its Tamiya compatible.

So first things first the cab so here it is.
heavy-01.jpg
... yes its a resin cab and therin lay my quandry. Anyway In orfder to fit the cab you need a chassisand to guage the chassis length you need a cab. Chicken and egg. Never mind lets build a chassis.

I was going to use a Tamiya Scania as a donor but looking around I have a lot of "spare" parts here so thought I might try and build from them.

This is a bit of a fantasy truck but its from a basis of a pic I saw. It was RED but I am mulling that one over.

First I needed some rails ;) no problem. Then I needed a set of rails to use as masters - again no problem as I had them from my block truck (which I must get on and finish). So out with the drill and the tap. The rear two axles and suspension unit I had here from a T cab that I never finished. so in they went. Next the rear steer axle and yes its very close to the two drive axles. I have some tamiya steering axles here but dislike them so niched an HH set from sock. A while ago I purchased a set of aftermarket spings with attachments so I used those and some U bolts from the spares box. Spare plastic parts from the spares box as well.
heavy-02.jpg
So thats as far as I can go this weekend, and yes I will need more bits for the front but next is mocking up the cab...
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astecme
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Re: Heavy Haul

Post by astecme » Tue Jul 30, 2019 8:04 pm

Ouch, nothing done since March. Well actually although the pic in the first post looked good the rear axles have been a right pain. Not so much the Axles as the mudguards. Now I know why people go for a triple straight mud guard!

Anyway its all fine intil you try and add a third axle that steers. It is once you have this mounted that you find that with the "normal" spacing it touches the mud guards when turning. The spacer in the rear twin set up is not there for fun but even once fitted I still had problems. The axle still touched and also the suspension mounts for it interfere with the mud guard mounts. So much of the time has been spent in figuring out what to do and buying more mudguards. On top of that the small drive shaft falls out because the hyper active suspension that I fitted to the rear pair of axles allows enough movement for it to drop out. I need a slightly longer inner or outer shaft.
heavy-03.jpg

Onwards and upwards. You will see that I have fitted an inline motor gearbox. 550 motor and metal geared gearbox rated at 1000 rpm per volt at 12 volts. I am not using that so its a bit slower. Same motor as in my wrecker. I didn't find a mount for it so that was fabricated in the workshop. A fairly simple saw, file and drill job (assuming the measuring was correct.
,

I elected to fit servos and designed a single/dual chassis mounting servo mount and cut several on the engraver. I used 3mm black styrene and they seem fine. I am using turnbuckles direct from the servo to either side steering arms. The servo mounts are slotted so they can be moved for Ackerman.
heavy-04.jpg
Lastly fitting the cab. Its a resin affair and you have to mount the bumper to the front frame (not the bracket). I glued the bumper to the wheel arches and found that the super single touched the arch on one side, I assume that this is due to shrinkage/movement in the mould ( the manufacturer showed me pics of a new set and they are dead on. Mine was 2mm short at the bottom. The resin is thermosoftening so some boiling water and a careful tweak we are back to fitting.

After a good deal of thought I elected to drill the front frame through 3 mm. Then block the bumper up and mark through for drilling. I drilled 2.5mm and as deep as I dared. Then used 3mm long self tappers (A la Tamiya ) to secure. Next is the cab to the bumper and that has been a little bit of a challenge. Two brass hinges are supplied and these were mounted either side just inside the rails with the hinge to the front of a mounting step on the bumper. They have to be at the front else the cab will not tilt. drilled the hinges 2mm. marked both outer holes on the resin and drew a line between then marked the innerones on the line so as to ensure the hinges were straight. Drilled 1.5mm and used the 2mmx10 slf tappers from the Tamiya kit. Then a test fit of the cab showed that it was too far forward so some measuring and some material removed from the hing area in order to move it back until its straight and fits the arches. H bit fiddley but then hinges raised - marke through the holes and drilled 1.5mm - this time I screwed through a 3mm nut so the screw only penetrated about 7 mm.
heavy-05.jpg
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Bricktop
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Re: Heavy Haul

Post by Bricktop » Tue Aug 13, 2019 7:35 am

I like anything that isn't 'out of the box'
Sometimes the real modelling talents lie in the mind of the modeller, not the quality of the kit.

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astecme
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Re: Heavy Haul

Post by astecme » Tue Aug 13, 2019 7:50 am

There are a few stock parts stu, like the springs and chassis spacers. Axles are metal that I had here from when I was thinking about an 8*8.

I am.working on a rh dash for it at present.

Another long haul! Haven't even thought about colour scheme. Maybe have a poke at kings (as they are embedded Volvo people) or maybe aireys
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astecme
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Re: Heavy Haul

Post by astecme » Mon Sep 09, 2019 7:53 pm

Well this had been a sort of truck. Sort of knew what I wanted but not exactly and then I saw my inspiration! A beutiful, Beutiful heavy haul rig. It was a 730 and this build aint a 730 so its that truck with a twist.

First thing was it is clear the truck is an 8x4 with a front rear steer axle so a few changes there. Its also a tad shorter so new rails...
heavy-08.jpg
heavy-09.jpg
I am not exactly sure where the motor will go at the moment and there will be some work for the steer acxle and servo etc.
heavy-10.jpg
heavy-12.jpg
These are the front end. The cab is resin and it took me ages to figure a mount. I was sure that the plastic front cross member would not cut it so I bought a metal one and then drilled out the screw =holes to 3mm, Marked up the resin in line and the right height, drill that 2.5mm and screwed it up with long 3mm self tappers.

You can see the sevo floating but thats not a problem, It has a high torqe servo saver fitted!
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astecme
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Re: Heavy Haul

Post by astecme » Mon Sep 09, 2019 7:59 pm

heavy-11.jpg
I have an HH full metal fith wheel and thats been mounted using the 620 rails as a guide.
heavy-13.jpg
Back at the front end I have created a low deck for the cab. I cut 6 ali tube spacers and thats all bolted down. You can see that the cab is also mounted to the lower grill and arches. The deck is also shaped and screwed to the top of the arches using the little 2mm self tappers in the tamiya kit. This is to provide some support here as when the cab is back it currently sits on them... I need a solution for holding the cab in place.

This is only a few lines but believe me it was not that simple so this took me a while to suss out!
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astecme
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Re: Heavy Haul

Post by astecme » Mon Sep 09, 2019 8:03 pm

The cab is supplied with LHD dash and I want RHD. I looked at chopping and its not possible so I made a new one out of plasticard. Now that took a while ;) . Then I moulded that in silicon and cast it in PU resin. Its actually 3 moulds and about to become 4. In creating this there seemed no point in leaving out a few missing details...
heavy-06.jpg
heavy-07.jpg
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astecme
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Re: Heavy Haul

Post by astecme » Mon Sep 09, 2019 8:08 pm

Some time ago I bought a Lesu heavy haul tower from someone at the club (STU). Well thats re-appeared. I fitted it on and its the wrong way round for the build truck. So that was stripped and turned round.

It was a bit fiddly and the beacon towers and spots have had to go and I will replace them later.
heavy-14.jpg
So this is how we sit now.

Meanwhile I have machined some multipurpose servo mounts dual or single centrally mounted ( I was thinking about Ackerman on the steering) so thats probably the next bit that you will see.
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astecme
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Re: Heavy Haul

Post by astecme » Tue Nov 05, 2019 7:52 pm

Quite a bit going on but slowly.

I tried fitting a servo for the rera steer axle but there is just not enough room for what I am doing so we are back to a mechanical link. The axles I am using are the HH ones and they have a sideways servo horn so its a case of linking them. You cannot have a straight link as there are bits in the way! so the link is in the form of a cranked bar. Essentially 2x 3mm threaded shafts with 90 degree bends and glued into an ali tube, then having captive olive ends screwed on. This means that currently the steer is the same front and back, I'll sort that later with an extension to the arm on the axle.

The cab is in paint - not finished but you begin to get the idea.
heavy-15.jpg
.

I didnt like the heavy haul pack, so I bought another from Scale parts. Didn't like that either so now I have settled one of the Lesu ones.
heavy-17.jpg
and just for some excercise I have been working on the rear lights. I want a heavy haul tow hitch but if you put that on you lose mounting points for the mudguards (now I see why people fit the meatal square format ones). Anyroad up - the rear light cluster on this is not kit form so thats another little job that has taken ages. I have chopped the original holder, massaged it and fitted DMW light clusters.
heavy-16.jpg
Starting to think about decals now but probably getting a little ahead of myself. There are a couple of challenges yet...
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