Technical, Techniques, Hints, and Tips > Engineering Techniques and Materials.
how to make a working gun turret
John W E:
hi there
I forgot to mention - I used several servo expanders and they also slow down the movement of the gun turret - to operate the rotation. I used the original units produced by Forge Electronics and I note they have a new version available. What this version is like compared to the 'old' one I am not sure. However, I know that the version I have does the job really well - it slows the movement of the turret down from left to right and gives you 180 degrees. I also have another servo fitted in the turret itself which operates the turret elevation. This has another unit which slows down the movement of the gun barrels to give a more realistic affect. The servo for the rotation of the turret is mounted under the deck - there is also a servo under the superstructure as well.
Here is a link to Forge.
Servo Controller (forge-electronics.co.uk)
john
frogman3:
--- Quote from: John W E on April 14, 2021, 01:13:43 pm ---Hi this may help you out
https://www.modelboatmayhem.co.uk/forum/index.php/topic,33734.msg402159.html#msg402159
john
--- End quote ---
HI John many thanks an is it possible for some pics of the turret turning mech under the decks ? an may i download your turret pics for me to study ? cheers
chris
frogman3:
--- Quote from: microgyros on April 14, 2021, 01:17:44 pm ---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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AN CHEERS for your help thank you
chris
John W E:
hi there,
The white drum thing is an actual mounting ring - which is made from Plasticard - and that is glue to the servo - and the ring is glued to the underneath the deck and in this photograph you can see the actual superstructure part. Inside the drum there is a connection between the splines on the servo and the bottom of the turret, which is a tube that can be adjusted for various heights.
frogman3:
--- Quote from: John W E on April 14, 2021, 03:36:33 pm ---hi there,
The white drum thing is an actual mounting ring - which is made from Plasticard - and that is glue to the servo - and the ring is glued to the underneath the deck and in this photograph you can see the actual superstructure part. Inside the drum there is a connection between the splines on the servo and the bottom of the turret, which is a tube that can be adjusted for various heights.
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OH THANK YOU John for the pics an info cheers
chris
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