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Pz. I Ausf F VK 18.01 - Minenknacker

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  • Member since
    August 2020
Pz. I Ausf F VK 18.01 - Minenknacker
Posted by lposter on Wednesday, February 2, 2022 1:15 AM

Hello 

 

I decided a few months ago to start a small tank and this one caught my eye as it has many interesting features and its purpose was interesting too.

The Minenknacker ("Mine Cracker") was an ultimately pointless developmentof the Pz I resulting from an apparent "need" for a heavy shellproof tank that would support breakthroughs of heavily fortified areas in the early days of the war.


1939 saw the start of the project which would have  fat tracks and 80mm of armor in front, 50 mm in the side and was invulnerable to all AT weapons. It had  torsion bar suspension and two MG 34s in the turret. 30 units were produced by 1942 even though the context the design was supposed to address had all but dissappeared (assaulting Maginot Line type activities).

As is usual, tanks that are badly designed or obsolete ended up in  "police" type duties in partisan areas of the eastern front where the Ausf F did fairly well. A battalion of the tanks was supposed to take part in the invasion of Malta but that didnt work out in the end.



Its a nice tank as it loads of features that pop up in later designes (torsion bars, overlapping wheels, the vision block is very Tiger-esque etc etc.).

I hope to build a 1:16 scale scratch built model from steel and brass. I have a set of Tiger transport tracks that may work but a custom gear set will be needed. Stumbling points are the wheels due to they way they are designed but I am more than willing to sacrifice accuracy in order to get something completed.

p

 

 

  • Member since
    August 2020
Posted by lposter on Wednesday, February 2, 2022 1:24 AM

First things first was to start the superstructure. This is being made from 2mm mild steel. I simply marked out the shapes on a sheet of it and used a hacksaw and files to get it somewhere close. Final fitting later.

Due to the confined space it will have to be torsion bars for suspension so I drilled out the mounting holes for the swing arms. These have a weird configuration in that the ones on the right swing one way and the other side swings another way.

These swing arms were made from a 4mm thick steel bar. Holes were drilled for the suspension linkage and the wheel axles themselves.

The ends were then rounded on a mini belt sander.

The pins that will engage the torsion bars themselves were made from 6mm steel rod with a slot cut in the end using a Dremel cut off wheel. The rods were then cross drilled and tapped to M2 - this will allow me to lock in the torsion bar once installed. Hard to explain but pictures later should clarify the matter.

The rods were then silver soldered to the swing arms.

Next will be fleshing out the hull.

 

P

 

 

 

 

  • Member since
    August 2020
Posted by lposter on Wednesday, February 2, 2022 1:30 AM

To proceed with the hull, I made up some panels that will function as the upper deck and so on and started on the turret. This is tricky as it has a concave curve type of arrangement. I simply built up the shell of the turret and wrapped it in a brass annealed sheet which was then filed to shaped once soldered in place. There are gaps here and there but that is what filler is for I guess.

The arrangement for the suspension is visible inside the hull - basically a support rail for the swing arms an dthen mild steel clamps to lock down the torsion bars.

 

Its a bit rough in places but thats often the way at the start I guess.

 

P

 

 

  • Member since
    August 2020
Posted by lposter on Wednesday, February 2, 2022 1:39 AM

The turret is a thing of horror for making so I tackled the low hanging fruit first and went at the mantlet. It is a steel pipe I got off fleabay and that I simply cut in half and sanded flat.

Then I made some machine gun shrouds or whatever they are and in they went.

Then the guns were made from bar stock and stuck in.

While I was at it, I bought a TIger vision block online and attached that and finished off some bits on the engine deck.

I am in two minds about this vision block. Its poorly made from white metal and I am not sure I like it all. Making one would be a hassle but I will have to think about this.

 

Otherwise....the wheels are next I guess and I am not looking forward to those at all.

 

p

  • Member since
    May 2009
  • From: Poland
Posted by Pawel on Wednesday, February 2, 2022 3:27 AM

Well, well - now that's very different modelling than what we see everyday... How much will this thing weight when done? Are you going to make it powered? If yes, what motor? How about the tracks, what is your plan?

Thanks for sharing and have a nice day

Paweł

All comments and critique welcomed. Thanks for your honest opinions!

www.vietnam.net.pl

  • Member since
    August 2020
Posted by lposter on Wednesday, February 2, 2022 3:39 AM

Pawel

Well, well - now that's very different modelling than what we see everyday... How much will this thing weight when done? Are you going to make it powered? If yes, what motor? How about the tracks, what is your plan?

Thanks for sharing and have a nice day

Paweł

 Based on previous models .....I guess 6 to 8 kg or something?
 
I will power it.....the motors/gears will I make a post on.
 
Tracks are steel 1:16 tiger transport tracks.
 
The width and look are OK but they have two track horns instead of one so workarounds there will have to be.
 
P

  • Member since
    August 2020
Posted by lposter on Wednesday, February 2, 2022 4:06 AM

These are the motors and gear setup - saying that the gears have changed by now.

The motors are 12 V motors that run at 200 rpm or something. I will run on 7 V so the rpm's reduce to something that produces a realistic speed.

I had made the "gearbox" out of acrylic but it just does not have the strength I would hope for.

So it has been remade in steel. The form is the same but the material is the only thing that changed.

The new version also uses bearings on the drive shafts which I did not have on the acrylic version which just used bushings.

There is literally no room for bigger motors but having used these ones in other tanks before I am reasonably confident they have the grunt necessary to move the thing.

P

  • Member since
    August 2020
Posted by lposter on Monday, February 7, 2022 10:57 AM

Made some progress on roughing out the front mudguards. Lot of detail to add to these.

 

I ran into a snag with th erear ones. The drawings I used (see first post) indicate that the two rear spring tube mounts (similar to those on a stug) are in line with each other -  at the same position on the hull. Having checked some walkaround photos however, it appears they are mounted in different spots on either side. Which really messed up by rear mudguards and I have to start those again.

I started on some of the road wheels. I ordered some aluminium disks off fleabay of the right thickness and diameter (give or take a mm or two). 

Making spoked wheels is not something I have done before so I plotted out some holes correspodning to - I think - the apices of the holes between the spokes. Then I drilled a big hole at the center of the three smaller ones and with a piercing saw I trimmed off the stumps. Then started filing.

They are rough but should be OK when I get more time to finish the filing.

I made hubs for the wheels using brass tube and disks silver soldered together. These were then press fit into the wheels and will serve as retainers for the axles.

 

I now have to make the tyres which will be from black acetal tubing.

 

p

 

 

 

 

  • Member since
    November 2009
  • From: SW Virginia
Posted by Gamera on Tuesday, February 8, 2022 6:46 PM

Wow that's a pile of work but going to be soooooooo cool when done! 

Great work so far! 

"I dream in fire but work in clay." -Arthur Machen

 

  • Member since
    August 2020
Posted by lposter on Sunday, March 6, 2022 12:36 PM

I thought I would update this. Please excuse all the filler, fingerprints, tarnishing etc. I cannot be bothered sanding and cleaning just to take photos.

Ive been busy fleshing out the mudguards and so on...not finished by any means and not entirely accurate either. The load outs on these fenders seems to vary strongly between photos so I went with what suited myself best. Still some to do.

I also attended to the swing arms.... bit awkward and I have noticed some issues which need attending to.

The idlers look mad at the minute. They stick out a lot but thatis how they are with tracks of this width. I have to finishh the mounts for them and add tension adjusters (non functional). I also have to do all the external spring tubes which will be a faff.

Please note that nothing is screwed down so some things are askew....... for the minute.

 

  • Member since
    May 2020
Posted by Keyserj on Sunday, March 6, 2022 4:58 PM

Heck of a lotta skill involved in this build. Bow Down Keep up the great work.

"Why don't you knock it off with them negative waves?"- Oddball

 

John

On the bench:

 

                     

  • Member since
    November 2009
  • From: SW Virginia
Posted by Gamera on Tuesday, March 8, 2022 8:13 PM

Wow! Almost a shame to paint that and cover up all your work! 

"I dream in fire but work in clay." -Arthur Machen

 

  • Member since
    April 2003
  • From: USA
Posted by keavdog on Tuesday, March 8, 2022 8:15 PM

I agree!  No way I would paint that.  It's beautiful.

Thanks,

John

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