|
Post by gerard on Dec 19, 2008 17:53:22 GMT 1
Hi Markus, Six month ago,I've order to you drive set for Bismarck. Everythings ok. I've just begin the model.I'm thinking for turrets.I want motorise 380mm turrets and,the 150mm turrets. I've some questions for you:For 380mm turrets,I've need special esc (as you with 2 M'out) or no? Is it possible to use 1 esc with y cable for Anton, Bruno and Cesar ,Dora turrets or no?In the excellent Robert's drawings,there is, ondrawing for secondary turrets,a servo slow down module. What is this and why? Is it possible to rotate,electrically,380 turrets with a radio 4ch and what can do? Excuse for all questions, but if you can answer,a big thank to you. Sincerelu yours. Gérard (the Frenchy) .
|
|
|
Post by markus on Dec 19, 2008 18:18:42 GMT 1
hi gerard !
you don't need a special esc, you can connect several 'servos' to a 4amps esc.
in this case you have to remove the servos' electronics so the 'servo' is a simple geared motor which drives the turrets
the servo slowdown module needs UNMODIFIED servos, it makes them rotate slowly from one position to another depending on a simple contact which can easily be triggered by a switch or switch module
using this module results in different rotation angles, depending on servo type:
mini servos turn 90 degrees, perfect for the 150mm turrets
normal servos turn 180 degrees, so you'd have to use a standard servo for the 380mm turrets.
normal servos are almost impossible to use for the 380 turrets, that's why i used the module for the small turrets only...
a 4ch is enough to rotate ALL turrets
markus
|
|
|
Post by gerard on Dec 19, 2008 20:43:31 GMT 1
Hi Markus, Thanks for your respsonse. I'm very happy to communicate with you. Who made the slowdown module and your servo maker. My radio is an Modelcraft as you but 4 ch. Good Week End. Sincerely yours. Gérard.
|
|
|
Post by markus on Dec 20, 2008 10:17:32 GMT 1
i bought these parts in our local model shop.
don't know who made the module, but the servos are fron modelcraft..
markus
|
|
|
Post by gerard on Dec 29, 2008 10:46:22 GMT 1
Hello Markus, I hope you had a good Christmas. One question: What kind of ESC do you use the turrets of 380mm and 150mm: The ESC or ESC brushless motor brush (I do not know the type of engines fitted to servos). Could you post some photos of the bottom of your bridge to see the installation of your servos? Another question: Could you possibly give me the slowdown module if I am unable to obtain one? Thank you. Happy holidays to you and to all those who read this message. Gerard.
|
|
|
Post by markus on Dec 29, 2008 18:50:45 GMT 1
hi gerard ! i only used a esc for the 380mm turrets. it's a 4amps esc for BRUSHED motors (servos have brushed motors). so this esc drives 4 'servos' (now they are only geared motors) it's hard to get the main turrets 100% synchronous, that's why i'm doing some tests with that module. servos connected to that module move extremely slow. this module is simply connected to a proportional channel of the receiver used this module for the 150mm turrets. this module makes servos turn slowly by 90 degrees as long as the yellow and brown wires are connected - perfect for the 150mm turrets. this module cannot be connected to a receiver. it needs a switch module (or a microswitch which is triggered by a servo) so if you need any of these modules just let me know.. markus
|
|
|
Post by gerard on Dec 30, 2008 12:18:59 GMT 1
Hi Markus, Thank you for the information and photos.I 've seen on the net for a slowdown module weights 3 grams, operating between 4 and 5.3 volts and can operate 2 servos. I wonder if this is sufficient. Could you give me the price of yours and tell me how paid you .Can you tell me the manufacturer of your railings because I did not find on the net. Have you changed your email address because I've tried to contact you without result? Thank you. See you soon. Gerard.
|
|
|
Post by markus on Dec 30, 2008 12:48:56 GMT 1
if this module is capable of only 2 servos, you'll need 2 of them for the 380mm turrets (or 3 for the 150mm turrets) the modules i used are capable of 8 servos price is 20 euro for the small module, 25 euro for the bigger module (+10 euro shipping to france) yes, my email adress has changed, just click on the letter symbol on the left for the correct one you can pay with paypal or bank transfer already asked the model shop owner about the manufacturer of the railings, but he didn't want to tell me seems he wants me to buy them in HIS shop.... markus
|
|
|
Post by popeye on Jan 2, 2009 6:01:12 GMT 1
Dear Gerard. I have now designed the main turrets and their gun barrels and servos for my Bismarck (see "Popeye's build" in the Build Diarys section). The pictures and details of the construction are also posted on my Flickr site in the set called "Bismarck Main (380 mm) Gun Turret" at: www.flickr.com/photos/commander-popeye/I also use a servo slowing device, which fits in line between the receiver and servo with all the necessary plugs and pins that means it can be connected directly in with any addition wiring. It cost about £12 from my local model shop but is widely available on the internet (do a search on "radio control servo slowing"). I use a small 180 deg servo.
|
|
|
Post by nm on Jan 2, 2009 9:19:26 GMT 1
Nice work!
One good turn deserves another.
nm
|
|
|
Post by Mark on Jan 2, 2009 9:31:21 GMT 1
Hi Popeye,
Can you give me details of the 180 degree servo you used. The only ones I've seen are large servos for retractable landing gear, and I don't think that they are proportional (could be wrong there........)
|
|
|
Post by popeye on Jan 2, 2009 14:16:26 GMT 1
Dear Mark The landing gear servos (which can turn up to 360 degress) that I looked at for turret control were not proportional and I have a suspicion that none of them are, they are simply designed to turn all the way to lower or raise the undercarriage and there would be no requirement to stop partway (indeed, it would not be safe). The servo that I got was one of a number of "mini" servos that my local model shop sold. It is a Cirrus CS402/BB Mini Servo - 18 gram/0.64 oz. It measures 28x13x33 mm and turns through 180 degress in about 0.2 seconds (without the slowing device). it delivers about 2kg/cm 30oz/in torque. The internal mechanical stops actually allow it to rotate 270 degrees so with a modern radio control transmitter that allows you to "overdrive" a servo by up to 50%, you can get more than 180 degrees of turn. Hope this helps. This is a picture of the servo slowing device This device takes 2 inputs from the radio control receiver and has 2 separate outputs (one from each input, which can drive more than one servo on each output, e.g. by using a "Y" cable) which drive a servo slowly. The speed adjustment is via a small variable resistor on the board (the screwdriver is pointing to the adjuster). It can slow a servo down to about 3 seconds to turn by 180 degrees
|
|
|
Post by Mark on Jan 2, 2009 15:58:02 GMT 1
Great - many thanks Popoeye - I'll keep my eye out for those
|
|