Ok.. based on Bob Martin's design, I modified the servo mount tray to fit my overkill servos. I also simplified it a little bit by eliminating the screw bosses that secure it to the tray. I ensured that the lower part of the mount was large enough to fit the receiver, as it seems a very convient place to mount it. Of course I do not have a picture of it... HWSNBN has a nice picture of the resin part he's pulling on his daily work thread. . It's a very simple design. I need to print another one as it needs just a bit more tweaking.. the servos are a little too loose, and the rails just a little too far apart. EZ stuff... but no more white filament. I wish someone made filament in the proper, interior green-gray that's so hard to describe but so recognizable. Anyhoo....
In all it's glory.. you can see where I trimmed the servo tray a bit to allow the servos to plug into the receiver. I'm going to have to watch for interference between servo leads and the control horn on that side. Still waiting for my double sided servo tape to show up. So here are the questions:
Top view...
Ok. I'm in the outer holes on the servo horns. The thing about rotary motion on a servo, it introduces side motion into the pushrod b/c the point on the horn which the pushrod is fixed to moves in an arc, not linearly. That's not normally an issue but here, where the pushrod has to pass through a watertight gland, that side movement seems unwelcome. I have 2 fixes, neither of which will eliminate motion, just minimize it. First is to run the pushrods to the inner hole on the servo horn. This, of course, reduces the amount of motion the pushrod can have and limits travel. The second is to turn the servos around so the output is at the front of the tray, furthest away from the bulkhead. Both of these would reduce the amount of side motion. Or is there enough flex in the glands that I'm concerned for nothing? I see the special slotted pushrods on the front servos.. important there as the servos are right at the bulkhead. Here, I have some room.
I've decided which boat to model.. USS Norfolk, SSN 714. Built local, stayed local, did it's job and brought crews home.
In all it's glory.. you can see where I trimmed the servo tray a bit to allow the servos to plug into the receiver. I'm going to have to watch for interference between servo leads and the control horn on that side. Still waiting for my double sided servo tape to show up. So here are the questions:
Top view...
Ok. I'm in the outer holes on the servo horns. The thing about rotary motion on a servo, it introduces side motion into the pushrod b/c the point on the horn which the pushrod is fixed to moves in an arc, not linearly. That's not normally an issue but here, where the pushrod has to pass through a watertight gland, that side movement seems unwelcome. I have 2 fixes, neither of which will eliminate motion, just minimize it. First is to run the pushrods to the inner hole on the servo horn. This, of course, reduces the amount of motion the pushrod can have and limits travel. The second is to turn the servos around so the output is at the front of the tray, furthest away from the bulkhead. Both of these would reduce the amount of side motion. Or is there enough flex in the glands that I'm concerned for nothing? I see the special slotted pushrods on the front servos.. important there as the servos are right at the bulkhead. Here, I have some room.
I've decided which boat to model.. USS Norfolk, SSN 714. Built local, stayed local, did it's job and brought crews home.
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