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Post by Mark on Jun 22, 2007 1:24:35 GMT 1
Hi Markus,
Any suggestions on how to make the guns elevate ? Maybe we need to see all the parts of the turrent and barrels before something can be worked out, but I was thinking of fixing the barrels to a pivot bar and mounting a micro servo in the turret. Just a simple link from the servo arm to the pivot bar ?
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Post by markus on Jun 22, 2007 13:15:31 GMT 1
Hi Markus, Any suggestions on how to make the guns elevate ? Maybe we need to see all the parts of the turrent and barrels before something can be worked out, but I was thinking of fixing the barrels to a pivot bar and mounting a micro servo in the turret. Just a simple link from the servo arm to the pivot bar ? if i make turrets turnable (maybe) i will do it this way: 1. mounting a mini servo under the turret so that the turret is mounted on the servo instead of the servo lever 2. creating "part x" (maybe a plank shaped to a half circle??) to lift the barrel when turning left or right
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Post by markus on Jun 22, 2007 13:29:37 GMT 1
pic shows the"turrets" directly on the servo. if these standard servos are used, they probably have to be mounted in the deck. with 3 of those y-cables all 4 turrets can be connected to one channel, like mentioned before the other 2 turrets need a inverter to change the turning direction or modified servos (with cables on servomotor and potentiometer changed) that all turrets turn left/right at the same time
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Post by Mark on Jun 22, 2007 14:48:35 GMT 1
That's how I was going to mount the servos & turrents, although I'm thinking about connecting the front pair to one channel and the rear pair to another, so they can be moved indepedantly (as long as I don't run out of channels ) Personally I'd rather have the elevation as a separate function, although your "X part" would be a cheap and simple alternative.
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Post by swanrail on Jun 22, 2007 15:51:43 GMT 1
Problem I can foresee is that the Anton turret will be mounted on the foredeck which is permanentyl fixed, whilst the others will be on the removable decks (will the aftermost one be on the smaller lift out section, leaving two turrets on the main middle lift out?) I like the simple lifting gear, this follows along the same line of thought as myself. The main reason for me raising this issue now is that the Anton turret, being on the fixed part, will need work on the hull before it is covered over and inaccessible. The others should not be so much of a problem. As a thought, Anton could have its one servo, and if the other 3 turrets are on the middle lift out then one servo driving a gear and chain mechanism would suffice, would also allow the after two to rotate in the opposite direction by means of another cross over chain and pulley wheel-mechanical rather than electronic.
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Post by markus on Jun 22, 2007 17:41:30 GMT 1
Problem I can foresee is that the Anton turret will be mounted on the foredeck which is permanentyl fixed, whilst the others will be on the removable decks (will the aftermost one be on the smaller lift out section, leaving two turrets on the main middle lift out?) I like the simple lifting gear, this follows along the same line of thought as myself. The main reason for me raising this issue now is that the Anton turret, being on the fixed part, will need work on the hull before it is covered over and inaccessible. The others should not be so much of a problem. As a thought, Anton could have its one servo, and if the other 3 turrets are on the middle lift out then one servo driving a gear and chain mechanism would suffice, would also allow the after two to rotate in the opposite direction by means of another cross over chain and pulley wheel-mechanical rather than electronic. turret anton is located only by one half on the fixed part. nonsense, see below - sorry...why don't we fix the other half on the removable deck, put the mini servo in the turret base? so turret can be removed with deck and its servo i know other bismarck builders who connected all turrets by gears and chains, but i personally dislike too much weight above the waterline. this is no good with r/c use, don't want my bismack to 'swing' with a little wind or when turning markus
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Post by DON on Jun 22, 2007 21:47:46 GMT 1
Now I am confused. "Tirpitz" told us that Anton was directly over frame 25, which is one complete frame inside the fixed forecastle plank This position agrees with the diagrams in (much maligned) Anatomy of the Bismarck. According to my reckoning, this is 6cm ínside the fixed deck. Please correct me if I am wrong as I do not want a lot of unneccessary work on hard to reach places.
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Post by markus on Jun 23, 2007 0:02:10 GMT 1
Now I am confused. "Tirpitz" told us that Anton was directly over frame 25, which is one complete frame inside the fixed forecastle plank This position agrees with the diagrams in (much maligned) Anatomy of the Bismarck. According to my reckoning, this is 6cm ínside the fixed deck. Please correct me if I am wrong as I do not want a lot of unneccessary work on hard to reach places. oops..sorry !!! i measured the ship and found out i was wrong though i think there will be enough space in turret/base to mount 1 or 2 miniature servos, so drilling a hole for the servo cable(s) or even fixing a servo in the deck (from above) should be no problem afterwards markus
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Post by swanrail on Jun 23, 2007 13:38:19 GMT 1
Thanks Markus, thats put my mind at rest. Think i will take a chance and follow your advice with mini servo in the turret itself. Be interested to see how your turret turns out when you reach that stage, a long way off I guess?
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Post by Mikey on Jul 2, 2007 13:10:03 GMT 1
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Post by swanrail on Jul 2, 2007 13:30:21 GMT 1
I have now fitted my first servo to control the Anton gun turret. I carried out the following procedure for anyone who wants to do similar: This picture shows the mods needed to frame 25 to take the servo. It is best done BEFORE gluing down parts 60! Note the reinforcing strips to take the servo fasten down screws. This picture shows the mini servo in place. Note that as the barbette will only be 2.5mm above the finished deck and so the servo needs to be lowered. This picture shows part 60 in place, with the servo slightly protuding. Note the cut out in part 6o which is big enough to let the servo be removed if it ever has to. It also allows fine trimming of height for when the turret is constructed. At a guess, I might fasten a revolving disc on the servo to carry the turret, somehow mounted magnetically to allow the turret to be removed, but at least any major work to the hull has been done before its too late. I bought 4 miniservos from Steve Webb Models (www.servoshop.co.uk) together with 2 Y-leads and one extender lead. It is interesting that this company also sells a Y lead with one arm fitted with a reversing module, so that each servo moves in different directions. This is ideal for those wanting to conntrol 4 servos from one R/C channel, using one lead, normal on Anton, and reversed on Casar. Second Y-lead, normal on Bruno and reversed on Dora. My model will have forward guns Anton and Bruno on oen R/C channel, and Casar and Dora on the other. I have also gone deeper into the measurements. Unfortunately, part works never give you plans, unlike kit models. So I end up buying books to get the info I need. This time, I have bought the Anatomyof a Warship - Bismarck. Although much slated, what else is there? however, my impressions of the book is that it is more than sufficient for me, the German crew seem to think that the book is part responsible for the poor positioning of the stern anchor, but my book shows it in the correct place. His measurements leave a lot to be desired, but his drawings seem to be very accurate to scale of 1 to 550. Unfortunately, the original builders plans started numbering and taking all their measurements for the hull from a datum point which is where the stern crosses the waterline, which is several metres in from the end of the stern. With our model, I do not yet know where the waterline will be, so all measurements using this point are null and void. However, there is one point (and I have found only one)which is common to both our model and the plans, and that is the rudder stock. Taking this as a datum point, the meaurements to the AXIS of each turret measuring forwards from the rudder stock are as follows: DORA 33.657 metres 16.8cm to scale. CASAR another 18.2 metres or 9.1cm BRUNO another 109.986 metres or 54.9 cm ANTON another 18.2 metres or 9.1 cm These are the measurements I am using and to which Anton servo has been fitted.
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Post by markus on Jul 2, 2007 17:26:49 GMT 1
great work, don !!!
have you ever thought of motorizing the smaller turrets on both sides ??
markus
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Post by swanrail on Jul 2, 2007 22:10:08 GMT 1
Interesting thought, Markus, but I only have 6 channels on my R/C kit, two of which are meant for switching, not servos, if I remember correctly. It would mean driving many servos from one channel is there any limit? and suspect not all guns should rotate the same amount. Anyway, as those other guns are on the removable bits, might be easy to modify at a later date if I ever get the inclination!!!!
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Post by markus on Jul 4, 2007 17:10:17 GMT 1
Interesting thought, Markus, but I only have 6 channels on my R/C kit, two of which are meant for switching, not servos, if I remember correctly. It would mean driving many servos from one channel is there any limit? and suspect not all guns should rotate the same amount. Anyway, as those other guns are on the removable bits, might be easy to modify at a later date if I ever get the inclination!!!! there's no limit if you power supply the receiver directly from the cells for the motors, no matter on how much channels the servos are connected. supply by a speed controller (BEC system) allows a current of 1A, this should be good for a max. of approx. 10 servos. controllers with 2A BEC should be able to supply more than 10 servos. markus
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Post by cooltrax on Jul 15, 2007 18:32:15 GMT 1
1. mounting a mini servo under the turret so that the turret is mounted on the servo instead of the servo lever
2. creating "part x" (maybe a plank shaped to a half circle??) to lift the barrel when turning left or right
[/quote]
I think your idea of a "part X" is a v good one. question tho.
what if the turrets are going to be sealed, your part x would need to be glued on the deck would it not, or do you have another idea?
"Innovation is 30% genius, 30% creativism and 80% alchohol"
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