m15 monitor

Advert

New Replies

Report Bug

Help/FAQs

m15 monitor

This topic is empty.

Viewing 11 posts - 1 through 11 (of 11 total)

Author

Posts
25 April 2020 at 13:01 #87186
sammyk
Participant
@sammyk
Hello fellow modellers I am looking for ideas for my monitor build. I need a servo that will do 180 degrees movement. At the moment I have a test rig set up and can not get the required movement.i have a computer radio that is set to max ,then i added a p96 servo morph to the set up . I can get the required movement with this set up but the servos stutter/twitch ,any ideas .regards sammyk
Advert

25 April 2020 at 13:01 #5590
sammyk
Participant
@sammyk
180 degree servo
25 April 2020 at 13:06 #87187
Malcolm Frary
Participant
@malcolmfrary95515
Rather than stretching the ability of a servo, its probably better to get a single turn winch and gear it down from 360 degrees to the 180 degrees you want. Or a 2 turn winch, which is 4:1 gearing to come down fron 720.
25 April 2020 at 13:15 #87188
Dave Milbourn
Participant
@davemilbourn48782
Model aircraft undercarriage retract servos all rotate 180°, and they're quite slow. P96 is not compatible with "digital" servos BTW.

Dave M
25 April 2020 at 14:42 #87189
sammyk
Participant
@sammyk
Hello fellow modellers,thank you very much for your answers to my problem, I will try one of your solutions .I do not use digital servos I like to keep things as simple as i can ,less chance of me letting out the burning smell. keep safe .regards sammyk
26 April 2020 at 18:14 #87214
ashley needham
Participant
@ashleyneedham69188
Funny enough I bought a book on m15 when in the IOW last year (which is where we SHOULD be now!!)

It really was just a bean tin with a couple of big guns on. That it has survived this long is quite miraculous.

Ashley
26 April 2020 at 18:35 #87215
Colin Bishop
Moderator
@colinbishop34627
Did you mean M33 in Portsmouth Dockyard Ashley? M15 was sunk in the Med..

M33 is certainly an interesting ship to visit and construction was quite crude really. The after 6 inch gun currently fitted was actually carried as secondary armament by HMS Canada at the Battle of Jutland..

Living conditions must have been hellish in the hot Mediterranean climate.

Colin
26 April 2020 at 23:33 #87222
Trevor Drabble 1
Participant
@trevordrabble1
My suggestion would be to use a 2:1 step-up gear ratio , with the larger gear mounted on a standard or high torque , metal geared servo , and the smaller gear mounted beneath the monitor . SHG ( no connection) do an excellent range of gears for this purpose , using either direct or belt drive , depending on your preference , as well as a good range of servos and sail winches .
27 April 2020 at 07:28 #87223
ashley needham
Participant
@ashleyneedham69188
Oops…yes! Wrong one. Thanks Colin.

Still bean tins though!

Ashley
27 April 2020 at 08:39 #87228
Malcolm Frary
Participant
@malcolmfrary95515
Posted by Trevor Drabble 1 on 26/04/2020 23:33:25:

My suggestion would be to use a 2:1 step-up gear ratio , with the larger gear mounted on a standard or high torque , metal geared servo , and the smaller gear mounted beneath the monitor . SHG ( no connection) do an excellent range of gears for this purpose , using either direct or belt drive , depending on your preference , as well as a good range of servos and sail winches .

My earlier suggestion of using a winch and gearing it down was partly to get the required travel with a smooth response, but to also give a more sensible traverse time. A bare servo will try to traverse the turret at the same speed the joystick moves, which just doesn't look right.
27 April 2020 at 10:02 #87229
John W E
Participant
@johnwe
hi there, if you go on to EBAY they do 180 degrees servos which are round about the £5 mark – but make sure you get the analogue one and not the digital one. That is one method,.

Also, if you go onto YouTube – there is plenty of videos – which show you how to convert a standard servo to either continuous rotation or, 180 degree movement.

I used a similar servo from EBAY myself for a crane on one of my models. I used a continuous revolving servo, but, used a gear ratio of something like 5 to 1 to give a smooth rotation of the crane. Just food for thought.

john

Edited By John W E on 27/04/2020 10:08:13
Author

Posts