Puma Sd.Kfz. 234/2 Metal Origin 1:16 WIP

This section is for builds that are not strictly Tamiya or Heng Long. For instance, replacing the electronics from a WSN or Matorro, or even a scratch-build.

Postby Met5 » Tue Jun 30, 2020 6:35 pm

Since the future is ahead of us and those who stop are lost, why not go from our beloved tracked vehicles to a rotated vehicle?

The Rubicon was crossed with the Famo going to put his hand on a vehicle that was not fully tracked.

This is not even tracked ..... it is only equipped with wheels.  8 moreover.

Since we love to kick ass at Patrie Officine we picked up this unfortunate model that ended up in the hands of a Dutch model maker.

The vehicle was declared complete with all the upgrades that metal origin brought out after the primitive model, upgrades that went to solve the problems (not a few) that the model presented.

Amiably renamed "squirrel" by the workers all once compared with the Famo he waited practically 6 months before being put into work.  The motto at the POs is "one at a time".

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I immediately liked how it had been painted. Among the many things that I am not able to do there is camouflage. I don't like mine.

This is a nice thing (having already painted it) but it increases the difficulties: if I make a mess it will not be possible to put a piece but it will have to be completely repainted.

Let's start with the disassembly:

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The recoil mechanism is nothing short of Franciscan. There is no elevation mechanism. The rotation of the turret is still absent even if the engine has been mounted on the hull

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The antenna has been attached, even two.

But the real show is inside:

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The transfer of motion is guaranteed by a cantilever pulley, the original transmission (replaced because it is too noisy) has been attached in a box with all the gears dismantled.

In support of the vehicle is a cloud of aluminum (or zamak)?) And copper filings

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The engine that acts as a belt tensioner is cool

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The idler pulley with a single twisted wheel constraint point which is a marvel.

The engine howls like a hyena in heat, earplugs not supplied;)



Let's continue with the discussion:

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Metal filings everywhere. Let's look at the lower parts:

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Some damage to photo etchings. The joy of watchmakers .....

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Overall: it should be a Swiss watch, at the moment it is just a bunch of pieces :)

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The vacuum of the FAMO is rapidly filling up, the dismantling has just begun:

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The master builder looks at the numerous parts: "let's start again with another desperate case" he seems to think:

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....stay tuned ;)

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Postby ronnie42 » Tue Jun 30, 2020 8:35 pm

Looking forward to see the improvements to the internals . Nice to have a build concentrating on the RC setup, not often do you see work on the internals.

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Postby midlife306 » Wed Jul 01, 2020 12:36 pm

I’m looking forward to this


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Postby Met5 » Fri Jul 24, 2020 5:05 am

We continue with the disassembly:

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Actually we indulge in disassembling it, having removed the wheels we proceed with the internal mechanics. The good thing is that they are all socket head screws

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The arrows indicate the wise use of hot glue to hold in place bearings that do not want to stay in place: scratch:

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The axle that replaces the original type. There had to be 8 ..... In theory ..... In practice there is only one. Great. So to order also the new axle shafts ........

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The removal of the wheels was not painless. To remove the studs (with all the thinner that friendly voices have recommended to dissolve the glue) we had some crashes. To be repaired or redone all from scratch. At the moment we put them aside, we have other headaches. I usually use vinavil for this kind of installation......

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The origin of the metal filings that I found in the hull. Planetaries and pinions in Zamak. It is consumed which is a pleasure. Adventurers in an almond-eyed suit and tie respond to my request for steel parts which they supply as spare parts in Zamak. Steel parts are supplied by third parties.

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The starting point is to make the shopping list. But every euro spent will be in vain if at the base I have gears that crumble. It becomes imperative to find or have steel sprockets and crowns built

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Postby jhamm » Fri Jul 24, 2020 9:59 am

Hi,
yes these Gears the worst i ever seen...
I am working on a solution for that, think the WPL differential gears is possible.

The gearbox is easy to fix with toothed belt:

Eingebaut.jpg

You see the output shaft with washers and spacer to measure the required length..
Einzelteile.jpg
Einzelteile.jpg (76.09 KiB) Viewed 839 times



Aufbau.jpg
Aufbau.jpg (53.83 KiB) Viewed 839 times


You need:
1x Geared 370er Motor with 250rpm at 6Volt
1x engine plate of 3mm aluminium
1x GT2 6mm toothed belt 112mm 56 teeth
1x toothed belt wheels 20 teeth with a Ø 3mm bore
1x toothed belt wheels 20 teeth with a Ø 8mm bore
1x shaft extension 21,5mm long outside Ø 8mm with inside Ø 4mm bore
2x spacer 4,2mm long outside Ø 5 or 6 mm with inside Ø 3mm
2x flange ball bearing MF83 ZZ 3x8x3 mm

the toothed belt wheel fit with two spacers 4.2mm long to the Ø 3mm output shaft
the other toothed belt wheel fit with at the shaft extension

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Postby ronnie42 » Fri Jul 24, 2020 11:34 am

This build is getting better, never knew the Puma had so many faults. Was going to buy one , went for the Jagdpanther instead lucky me. Lots of upgrades for rc cars and crawlers available , must be a nightmare checking out parts to replace the substandard drive chain parts. Can see this being a money pit getting a robust RC model looking at the cost of high end surface models.

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Postby Met5 » Sat Jul 25, 2020 10:21 pm

Thanks Jhamm but I decided for a more radical solution:

The first supplies begin to arrive. I would say that we did the calculations well:

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To be able to install definitively, just enlarge the gear hole from 4 to 5 and insert a bushing with an internal diameter of 3mm

We decide to celebrate with a healthy cleaning:

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And since at 34 degrees it is airbrushed that a pleasure we lighten the spirit:

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Ordered the other 8 gears now we can already imagine the result.

Someone will say "but did you also paint it outside?" Yes, we said that we liked the model of the painting but it is time that we at Patrie Officine learn how to make Camo

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Postby c.rainford73 » Sun Jul 26, 2020 12:41 am

Great work :wave: Enjoying your solutions to the problems presented :clap:
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Postby jcarducci » Sun Jul 26, 2020 2:01 am

Someone referenced your very interesting thread regarding this Puma. I'm curious what is the bevel gear set you purchased to replace the zinc gears?

I never miss an opportunity to replace a zinc gear; zinc gears are just wrong...

Good job, good informative thread. I'll be interested how this ends up. Yes I have a Puma kit or two...that I've not yet built.

Jerry

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Postby Met5 » Sun Jul 26, 2020 12:16 pm

Pending supplies, we continue to prepare everything that will be needed later. Given the reduced grip, the hands are light but numerous

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Postby Max-U52 » Sun Jul 26, 2020 1:22 pm

jcarducci wrote:Someone referenced your very interesting thread regarding this Puma. I'm curious what is the bevel gear set you purchased to replace the zinc gears?

I never miss an opportunity to replace a zinc gear; zinc gears are just wrong...

Good job, good informative thread. I'll be interested how this ends up. Yes I have a Puma kit or two...that I've not yet built.

Jerry


I didn't know you had an account here, Jerry. This is Crius from RCU. I can't be sure, but I think your favorite scale would be much better received here.
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Postby jcarducci » Sun Jul 26, 2020 6:44 pm

Max-U52 wrote:
jcarducci wrote:Someone referenced your very interesting thread regarding this Puma. I'm curious what is the bevel gear set you purchased to replace the zinc gears?

I never miss an opportunity to replace a zinc gear; zinc gears are just wrong...

Good job, good informative thread. I'll be interested how this ends up. Yes I have a Puma kit or two...that I've not yet built.

Jerry


I didn't know you had an account here, Jerry. This is Crius from RCU. I can't be sure, but I think your favorite scale would be much better received here.


Hey! Yup I don't use my account here much, not really sure why; just lazy routine I suppose. I do have a Puma in 1/10, actually 1 2/3 Pumas. I didn't
build them though, Nils Hermann did. But I will have to finish the 2/3's one... and I have lower frames for 1 more.

That said I would like to build one of the Metal Origin Puma models at some point however I'd like to get any better parts lined up beforehand..

Jerry

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Postby Met5 » Tue Jul 28, 2020 4:57 am

...... we continue to prepare everything that will be needed later. Given the reduced grip, the hands are light but numerous

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The first supplies arrive:

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Obviously it is not all rose flowers: the almond-eyed supplier does not take into account the exact height of the screws that secure the engine to the transmission plate. But let's not be frightened:

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Now they smooth out:

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Let's try to fit the new year box:

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It makes a good impression: lol !: Of course it is dimensioned precisely:

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Meanwhile, power the engine and see if it works .....


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Postby jhamm » Tue Jul 28, 2020 7:54 am

Hello,
very good solution for the Differentials.
What module and number of teeth do the bevel gears have?
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Postby Met5 » Tue Jul 28, 2020 8:05 am

Module 1:1, 20 tooth

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Postby jhamm » Tue Jul 28, 2020 8:12 am

I have had the Belt-Transmission too.
The Motor and the Planetary-Gear is Overkill.
It´s to heavy, take to much Place - therefor i replace it... ;D
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Postby midlife306 » Wed Jul 29, 2020 7:21 pm

Ohhh I like overkill


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Postby Met5 » Wed Jul 29, 2020 9:57 pm

As the material continues to arrive:

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Let's present some pieces on the frame and find that:

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The new Xiaomi transmission is too high .... The engine interferes with the rib. Nothing to scare proxxon:

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But who designed this model ??? Mickey Mouse??

We will have to rework the jumpers because of the new bevel gears:

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Obviously they will be painted again after making the throats

The creation of the gorges leaves some fallen on the field that must be restored with artisanal methods:

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Besides, there is no rose without thorns. Let's start from the front shaft:



A view to the planetary group

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To board the steering plates, simply remove the engine, not the entire transmission:

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Finally some good news: cheers: continue with the rear axle. Then the jumpers and small parts for the necessary repainting are disembarked. The job is done:



The work is not without imperfections: when the bevel gears are mounted with the threaded grain, the gear itself is decentralized from the shaft. An even more precise compass, perhaps made of rectification, would be necessary but we are satisfied.

A hair of graphite grease and a minimum of break-in should make the movement more uniform.

I am very satisfied with how the 1.2 volt powered engine still drives the whole train of gears with a commitment of very low power, trying to stop the movement you can't

The first step is passed.

The second step will be, after installing suspensions and axle shafts, the phasing of the four steered axles.

The question is whether with the huge (so to speak) reducer the second servo will enter or not (I wish you) or we will be forced to fall back on the single servo.

The engine does not touch the rear lid because the correct installation is with the engine forward and not with the engine towards the stern of the vehicle.

By installing the motor towards the rear, the transmission shafts (which are not the same) do not position themselves correctly with respect to the axle shafts.

That is all for the moment. See you soon! happy holidays to all :wave:

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Postby HERMAN BIX » Mon Nov 16, 2020 12:59 pm

Have you got any further on this Mr Met ?
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Postby Will01Capri » Mon Nov 16, 2020 2:26 pm

excellent, nice project to play with
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