Tiger Ausf E “F01” Gruppe Fehrmann

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AlastairCooke
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by AlastairCooke »

Hi All,
Update 21 Oct 2024
Curved support…
20241015_150559-doc.jpg
20241015_150606-doc.jpg
Support in use drilling locating holes for the track hanger pins…
20241017_113024-doc.jpg
Note use of shaped bases for G clamps.

Track links for turret sides have been drilled and tapped for M3 so that a fixing can be used from the inside. The hole will be hidden by spare track pins.
20241018_172209-doc.jpg
20241019_143625-doc.jpg
One link was drilled from the tread side to align the hole and the others were drilled from the rear as they could be held more firmly in a vice in that orientation.

Turret front plate
I have now reached a stage that I has had me concerned for some considerable time: reshaping the front turret plate ends and including weld detail. I wanted to ensure that the Milliput welds had reasonable purchase around these details. It was not possible to cut slots into the turret wall before assembly as the piece far exceeded the capacity of my mill. I decided to use a Dremel with a router bit and attack the aluminium by hand.
20241021_100624=doc.jpg
20241021_123546-doc.jpg
The ends of the bar were filed flush with the turret sides then drilled to accept a capping piece that will be epoxied in place after the turret has been etch primed.
20241021_154219-doc.jpg
20241021_154014-doc.jpg
The steel trunnion boss was used as a guide for the circular slot. As you can see, some additional shaping of the slots is required.

Zimmerit
As work progresses on the external details for the turret sides, thoughts turn towards Zimmerit. At this stage I am more concerned with where rather than how. Having established that the turret was taken from a vehicle that was delivered in late May 43, it is safe to assume that it arrived at Pz.Ers.Abt. 500 painted in Dunkelgelb but without a coat of Zimmerit. This means that the Zimmerit was applied at the School’s workshop after the general order was issued in Aug 43.

Careful study of images taken subsequent to the demise of F01, in Apr 45, highlights some interesting issues with the application of the Zimmerit paste. On both sides the paste was not applied forward of the lift lug and did not reach the roof on the left side as evidenced by the sharp ‘demarcation’ lines that suggest intent rather that wear. In addition, the pattern changes just aft of the vision port indicating a different batch of paste or a different hand. The pistol port appears to have had the paste applied when removed from the turret, as the ridge pattern does not align with the surrounding area. As the vehicle was based at the Training School it is possible that the application of the coating was a training exercise or done piecemeal when the opportunity arose.

When the time comes I will do my best to mimic this haphazard application.

That's all for now...
Alastair
Tiger 1 (2015 #01 with 2012 parts)

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AlastairCooke
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by AlastairCooke »

Hi All,
Update 10 Nov 24
The stock trunnion pins were turned down so that the bosses could be permanently installed on the turret sides and have weld detail added. The heads were also reduced to a diameter of 14mm to match the head on the rear boss.
20241028_151835-doc.jpg
Bosses and front plate ends epoxied in position…
20241110_094716-doc.jpg
Note the addition of a part that represents the torch cut remnant of the smoke grenade launcher system

Turret vision ports
The stock parts were replaced with a more accurate design that allows for some internal detail.
vision port-small.jpg
vision port-small.jpg (28.85 KiB) Viewed 512 times
20241110_115303-doc.jpg
20241110_115303-doc.jpg (79.7 KiB) Viewed 512 times
Pistol port
As with the vision ports I decided to replace the stock part. First, however the securing bolts need some attention to better replicate the coned taper bolts used on the prototype. The hex heads were turned down and will be ‘let into’ the outer plate.
20241102_103819-doc.jpg
Pistol Port front.jpg
Pistol Port front.jpg (41.25 KiB) Viewed 512 times
pistol port rear.jpg
Not sure yet whether to use moulded pins or the M3 cone head bolts to secure the outer plate. It depends on the ease with which the cone bolts can be turned before applying thread lock. I will be tapping the holes anyway for studs on the inside to mimic the through bolts.

Turret electrics
I have started to layout the components for the electrical circuit in the turret. Note that mine is completely separate from the chassis circuits and so I need another battery, relay, switch, charging socket, 12V/5V buck converter, receiver, elevation motor driver, microcomputer, and a fuse box.
20241102_084753-doc.jpg
20241102_084753-doc.jpg (91.62 KiB) Viewed 512 times
20241107_090702-doc.jpg
The item at the front of the plate is the mounting for some ‘piggy-back’ shocks that will be fitted without springs to act as dampers to minimise ‘barrel bounce’.

That's all for now.
Alastair
Tiger 1 (2015 #01 with 2012 parts)

Christoffer Ahlfors
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by Christoffer Ahlfors »

Reducing barrel bounce! That will be exciting! :D
A little too much is about right...

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AlastairCooke
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by AlastairCooke »

Yes, Christoffer. Time will tell if my plan works... I am fitting a pair of Gmade XD shocks.
Alastair
Tiger 1 (2015 #01 with 2012 parts)

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AlastairCooke
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by AlastairCooke »

Hi All,
Update 26 Nov 24
Turret side weld detail
20241111_151855-doc.jpg
20241111_151932-doc.jpg

Turret Electrics
Started to wire up the electrics.
20241120_085750-doc.jpg
20241120_085809-doc.jpg
Note the relay rating: 70A! I am aware that this is seriously overkill but wanted to use the same style of fuse/relay module as the chassis and the only one available had provision for a maxi relay. I am currently designing some boxes for the elevation motor driver and the microcomputer.
Arduino NANO Terminal Adapter V1_Deek-Robot v5.jpg
MD10C_R3 v14.jpg

Pistol port
Drilling holes for attachment bolts using my ‘bespoke’ rig…
20241125_090559-doc.jpg
Drilling guide in use to position holes and as a flat surface for the tapping guide…
20241125_090708-doc.jpg
20241125_145347-doc.jpg
Note use of countersink bit as a ‘key’ for the end of the tap to help ensure the thread is straight and true. The drill chuck on this micro-mill is too small for my usual spring-loaded tap guide.
20241126_122609-doc.jpg
All six holes drilled and tapped.

That's all for now.
Alastair
Tiger 1 (2015 #01 with 2012 parts)

Tim Carr
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by Tim Carr »

Very nice drill tap setup!

Lots of nice detail and wiring!

Later Tim
Tampa Bay, Fla area USA.

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AlastairCooke
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Re: Tiger Ausf E “F01” Gruppe Fehrmann

Post by AlastairCooke »

Hi Tim,
Thanks. I am glad you think so. Right from the outset I was not looking forward to adding the extra holes into the top and sides of the turret wrap. Hanging the turret off a portable workbench with a fixture to keep it rigid has worked out really well. My micro mill/drill with a head that can rotate a full 360 degrees has been a godsend.

Alastair
Alastair
Tiger 1 (2015 #01 with 2012 parts)

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