Creating a moving machinegun

[Mindstorm]

So i had an idea, since the hull machinegun on the HL Panther G is pretty good articulated, i thought i might try and build a way of making it swing left to right when the machine is used.

So i bought a RC “Lyre” (dunno of its the right word, but that thing offroad vehicles have to pull themselves out when they are stuck)
Because this would have a nice slowed down rotation, on which i could connect a wheel with an arm that would connect to the MG ball-mount, a bit like a locomotive wheel.
(Sorry if use incorrect terms, im not an engineer)

Anyways, my thought was to just to connect the little motor to the same connector the MG light goes to but than i started thinking the led of the MG flashes and of course i would want the motor to run continuously while firing the MG.

Is there any easy way i could get this to work?

Thanks in advance,


Casper

[Ad Lav]

You’d have to use a mini servo to get the MG to swivel, it has been done before.

[Jofaur86]

Exact already done, on this forum, with photos and explanations, see Sherman by Imcq11
viewtopic.php?t=34892&start=20

[Mindstorm]

Ah thx for the link! Im sure it will get me on the right path

[Herr Dr. Professor]

"of course i would want the motor to run continuously while firing the MG." I would want the MG to fire while I could independently move the barrel. That could be accomplished with a micro servo such as you see above and an electronic MFU (maybe the HengLong 7.1?) with the capacity to run the servo independently.

[Mindstorm]

I dont think it will matter much electronics wise if i use servo or a motor, i (only) have a HL 7.0 board btw.
What i wanted was a simple power trick to make the motor run and the MG fire, when i press the button on my controller.
But since the 7.0 board controller controls the flashing of the led, i cant tap power of the socket to power the motor/
Servo else it too will turn off and on.
Is it possible to re-program te board to give a continuous flow? Than perhaps there is another way of making a led flash on and off.

I much appreciate all your input though, it just takes a bit more time for me to convince myself that my idea just might simply not work and i need to accept that there is another way to solve my issue.

Thx

[Jofaur86]

Hello, don't you have to get your brain in knots? I don't really know the type of 7.0 cards? but what if you use a standard multi-channel and programmable radio? just use a free RX channel and everything will work according to your choice, without installing a gas plant, by searching this forum, you should find answers, there are enough people with a lot of knowledge and ideas, for having already achieved

[Jofaur86]

so I can go to bed more educated tonight? I just look at the HL 7.0 platinum diagram, indeed, dedicated transmitter, and non-standard modeling? so won't it be easy to do? in fact, the machine gun has limited lateral movement, on a servo, it is possible (with a good radio) to adjust its course? but with a motor, who will tell it the maximum displacement, except at the risk of breaking everything?
Now, what about the risk of repeating myself? some here may have an idea, or already made it?

[Mindstorm]

Im probably way out of my league of understanding servo’s and such, my choice of using a motor with gears to slow down the rotation was to create a mowing movement, since the Panther gunner sight was very limited, so to actually hit anything a mowing movement must have been common.
A slidable arm on a rotor should get me good movement i think, the position of the rotor (and lenght of the arm) should determine the range of movement.

But my question was actually only about the control of power, not the mechanism.

Of course i understand that i could buy more RC stuff and make that work somehow (but i would have to get myself properly informed what to get)

But in most ways im just a simple man, with (very) limited time and money due to health issues, so just wanted to press the fire-button on my existing controller and make the magic happen.

I still love Lego-Technic and Masterpiece Transformers, i just have a thing for moving parts i guess, and loving military stuff so its kinda just logic i ended up buying a RC tank.

Thanks again for your effort of explaining these things for me.

[Jofaur86]

I understand well, but any mechanical system like limit switches (example: microcontacts) in order to tell it not to exceed a certain limit, at risk of breaking something? a servo works with +/- electronics and a signal coming of the transmitter, and unless you have a mechanical or electronic system (timer) there is a great risk of breakage, if movement limits are exceeded? personal opinion. Only viable solution? use another type of board driven by a standard multi-channel TX. Sorry to break your dreams