Technical, Techniques, Hints, and Tips > Engineering Techniques and Materials.
how to make a working gun turret
frogman3:
HI ALL well im thinking of tryin to make my guns turrets on my tiger travis left an right an the guns elevate up an down ive got a few vague ideas but i wonder if anyone has done on on here to help me get a start in how to go about this as i was just goin to have a servo push the turret left an right but im not happy with that idea be much better with a motor turning the turrest but i need info so any ideas an diograms ?
cheers all
chris :-))
HMS Invisible:
Reverse engineering a low spec servo isn't always the best start but it's where info and diagrams and demos could help. I often come across reply posts on why this'n'that won't work from folk who don't know how electronic rc gear, like a basic servo, works at the component level.
I've taken a standard, quarter turn Futaba servo to slow it down, increase the travel beyond 180 degrees, reduce and increase deadband and so on. I can tell you this doesn't work well because the deadband, hence controllable resolution, is ten times that of its quarter turn equivalent. Geoff's observations would be shared by anyone who uses the same servo out of the box. The 2 turn servo will work perfectly well as a budget price, low spec sailwinch but is worse than a quarter turn servo to reverse engineer into a turret mechanism.
--- Quote from: frogman3 on April 14, 2021, 09:00:38 am ---... i was just goin to have a servo push the turret left an right but im not happy with that idea be much better with a motor turning the turrest but i need info so any ideas an diograms ?
--- End quote ---
So what's the specific problem that makes you unhappy with the idea?
Each way comes with its pros and its cons.
frogman3:
--- Quote from: microgyros on April 14, 2021, 09:51:56 am ---Reverse engineering a low spec servo isn't always the best start but it's where info and diagrams and demos could help. I often come across reply posts on why this'n'that won't work from folk who don't know how electronic rc gear, like a basic servo, works at the component level.
I've taken a standard, quarter turn Futaba servo to slow it down, increase the travel beyond 180 degrees, reduce and increase deadband and so on. I can tell you this doesn't work well because the deadband, hence controllable resolution, is ten times that of its quarter turn equivalent. Geoff's observations would be shared by anyone who uses the same servo out of the box. The 2 turn servo will work perfectly well as a budget price, low spec sailwinch but is worse than a quarter turn servo to reverse engineer into a turret mechanism.
So what's the specific problem that makes you unhappy with the idea?
Each way comes with its pros and its cons.
--- End quote ---
HI WELL as im building a fair sized ship i thought id like to the turret turn by a motor an i have been lookin at big ring gears on the web but just wondered if anybody has done a turret by motors thats all for some help
chris
John W E:
Hi this may help you out
https://www.modelboatmayhem.co.uk/forum/index.php/topic,33734.msg402159.html#msg402159
john
HMS Invisible:
--- Quote from: frogman3 on April 14, 2021, 12:26:41 pm ---
HI WELL as im building a fair sized ship i thought id like to the turret turn by a motor an i have been lookin at big ring gears on the web but just wondered if anybody has done a turret by motors thats all for some help
chris
--- End quote ---
The reduction ratio of a typical servo at 60 degree rotation per second, is around 300:1 and a shaft torque of about 2 kgcm.
You don't need further gear reduction if you lower the voltage and modify a few components.
Whatever you build, those figures are a guide to the total gear ratio, which might use a worm gear, and to the size of motor needed for turret rotation.
Here is an informative article on servo modification, if only to convert to continuous rotation. Link It would still benefit from lowering the power and altering a deadband resistor which would reduce overshoot and make it work better in conjunction with a servo slower.
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