31

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: October 27, 2018, 04:29:51 AM »

eres un genio ,sigo el proyecto con muchas ganas 

Thank you! Currently i'm working on a way to get easy access to the turret internals.
The top of it should come on off very easy.. I'm thinking about a solution with some Neodium magnets...

32

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: October 23, 2018, 12:28:13 PM »

The rotation of the turret now works like a dream! I got really inspired by these ball bearings, so i decided to use some of them on the barrel elevation unit also!



Next up (and almost finished) is the barrel elevation servo drive. This one will use gears instead of the normal servo arms..

33

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: October 23, 2018, 12:23:30 PM »

Some progress on the turret rotation drive. At first i planned on using a custom designed turret ring based on the Tamiya leopard 2A6 which has two ball bearing "rings" running in a large outer ball race.. I managed to 3D print it and  it worked, but the accuracy was too much off to let it run smoothly..

So back to the drawing board and this time i designed a turret ring based on a standard ball bearing 40mm inside diameter.
I want it to work with a standard Henglong turret drive so i made the turret gear as small as possible, 55t m=1 to be precise. This is the result of this ordeal:



Also visible is the interface for the turret bottom to form some sort of "Spindle shaft". This will be the backbone of the turret rotation.. Here also a view on the mounted Turret gear:



Clamped between the Gear and the spindle is a 24-strand slipring to get all the signals from the hull to the turret!

34

Show and Tell / Re: "Painbot" Battle Unit - combined IR apple

« on: October 06, 2018, 03:00:49 AM »

The small PCB is quite a good idea! I could also fit a connector to it and use it as the base of the unit.

Indeed there are 4 receivers and 4 hit leds planned and i wanted to daisy-chain them together with thin wires.
Pin count should be 7 then..

35

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: October 05, 2018, 09:57:59 AM »

So, a larger update on the front radar servo drive. This was a difficult one to get right. I started of a little bit like the AFV unit.
But i ditched the intermediate gear because i don't want the front radar to rotate 360 degrees, just want it to follow turret movement (panning).

Then there was the thing with getting the base frame to fit the slope of the turret bottom. Had to recreate the bottom in 3D and do a number of printing iterations to get it right.
Here the result in the design:



After a lot of tweaking on the gears, i managed to get it to run and fit right!



The servo kabel of the front radar up/down movement fits through the bearing center and under the base frame..

Now on to routing the servo cable in the front cable and to think about the design of the barrel elevation!

36

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: October 05, 2018, 09:50:13 AM »

te sigo con interes yo tengo un gepard tambien

Good to hear that you also have a Gepard! Keep watching this thread, when the project finishes i will post the design files!

37

Show and Tell / "Painbot" Battle Unit - combined IR apple

« on: October 05, 2018, 07:15:54 AM »

I was trying to source a "Piranha Battle Unit" for some of my builds, but it seems it is impossible to get one for a decent price here in the Netherlands.
Always there was a lot of taxes or shipping costs involved, so i decided to start designing one myselves..

It is not quite finished, but i hope some of you can help me out making some design decisions.
And, like always, i will share the design with the community when it is finished!

So, i started off with the recommended Vishay TSAL6100 and some TSOP32536 that i had lying around.
Some (4) basic 3mm red leds are used. These will be soldered together to a central connector.

The Receiver is became a three part design, bolted together:



And here is the little bugger after being printed in PLA:



The unit is roughly the same size as the Henglong IR receiver..



the only thing i did not really like is the connector on the bottom.. I have a 7pin row with 2,54mm pith mounted in the bottom. Maybe it would be better to use a 7/8 pin din connector or PS/2?
Please share what you think!

38

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 28, 2018, 03:46:08 PM »

Very nice, I like your idea using Taigen gearbox with Tamiya tanks.
Have Gepard  sprockets fit perfectly with Taigen 5:1 gearbox drive shafts?

The Taigen gearboxes have only one flat side on the shaft while Tamiya Sprockets have two..
I milled a flat side and the shaft diameter is the same and fits perfectly!

39

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 28, 2018, 03:44:43 PM »

And a little progress this week.. I did not have that much time, but i managed to design the Rear radar construction..



After printing it it toke some iterations and tweaking, but it now fits great on all four turrets!



The picture above shows the design just prior to the final one.. On the 3D picture you can see the difference.. Brackets to mount it in the big rear hatch are added..

40

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 28, 2018, 03:40:07 PM »

Gepard is one of my favorite models.  Nice work with the 3D.   See if you can build a cool  vibration system and LED lighting to go with it...maybe a off weighted high rpm motor....

Thanks for the input!

Dunno about how much the Oerlikon's recoiled. My colleague that served on the Cheetah told me to compare it with a "tank with two Browning .50 cal strapped to the sides" said the practically had no recoil.. They did  put out a lot of smoke like is shown in the video's you posted.. In fact i am now pondering about the seperate loudspeaker and acoustic smoker in the turret.... This would get very complicated...

41

Open Panzer Help / Re: Open Panzer TCB Scout and Sound foir a Stug Build - In Red!

« on: September 28, 2018, 03:33:37 PM »

Very Nice! Keep us posted about the programming!

42

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 21, 2018, 05:56:59 AM »

Front radar.. Even more challenging i think.. To fit the micro servo i head to open up the complete radar.
Printed a mount inside the radar, it took some passes to get the fitment just right:



Hard to see with the black and lacking contrast, but the servo is mounted inside of the 3D block and this fits the inside of the radar perfectly:


And now with some tuning up and down movement works like a charm! It will follow the gun elevation.

Next up is the rotational movement of the (front)radar it will be following the movement (pan)of the Turret rotation

43

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 21, 2018, 05:49:33 AM »

So, a little progress on the Gepard.. I started with some small details: the rear radar.
It should be able to rotate on demand and lifted up and down with a servo.

Space is very limited to fit a drive unit, and cost should be not too excessive. So i chose a miniature Geared motor that is easily available from Aliexpress:



The original mounting of the radar is completely opened up (easily done by drilling and an exacto knife) and i decided to enlarge the lower part of the mounting by 3D printing a tight fitting part to mount the drive:



And everything fitted snug and tight:



I will later design a mount in the big rear hatch of the Gepard Turret that wil fit the servo and a geared "transmission" to move the radar up and down.
But first on to the......

44

Open Panzer Help / Re: Open Panzer TCB Scout and Sound foir a Stug Build - In Red!

« on: September 21, 2018, 05:36:31 AM »

Great job on the PCB's! You beat me to it 

How did you fare with the positioning of the SMD components? The LED's are the only one that have specific +- orientation or not?

45

Show and Tell / Re: Tamiya Gepard(Cheetah) SPAAG

« on: September 18, 2018, 10:03:43 AM »

First off was ditching the original drive units. These Gepards are vintage stuff and they all have the Tamiya single motor drives with clutch mechanism in them.
I used some torro 5:1 low profile gearboxes that fit very nicely.



I made a 3D printed adapter plate that fits the lower tub of the Gepard, again this will be available for download after the project is finished!
Based on my previous 3D designs i now have a general layout for the acoustic smoker, TCB and i placed the Scout PCB and Opensound PCB in a possible location.