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Home✈️Aircraft🚁HelicopterAerial Photography and Video › 360 Degree servo on Tilt? Yay or Nay
04-26-2009 07:40 AM  10 years ago
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vrwired

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Boulder County, CO

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360 Degree servo on Tilt? Yay or Nay
Setting up a front mount.. thing is.. my tilt does not have enough range.. i was thinking of maybe getting the "servo stretcher" to get 180 degrees of rotation... or modifying to continuous 360...

Problems with each setup:
1. Servo Stretcher centers itself when I let go of stick, which I dont want.. I want to let go of the stick and have the tilt stay where I put it.. I use this radio for my Nitro 3d machine so I dont want to remove the spring on the radio stick..

2. 360 mod.. My operator would have to be careful not to spin the tilt all the way around with the camera on it...

I am using an HS-422 servo... it is 360 modifiable, but once again not sure which way to go.. It is a pulley system that is all setup, so I dont want to be changing ratios and belt sizes.. so I am trying to figure out how to extend the rotation range correctly..

Whats the best setup for this?
JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D
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04-26-2009 08:38 AM  10 years ago
daytonabeach

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Oslo, Norway

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Im trying to figure out this my self, a 360 servo in tilt for stills isnt suitable, cause when you fly solo you will never know where the gimbal will end up after some input from your tx.
I use the slider on my 14mz for that, along with one of the pot metres on top.

When using a regular servo i know that when the slider is on the bottom poss, the camera is tilted max down, 5 clicks up is 45 degree up etc.

Get it?

Any suggestions on how to get proper control with a 360 for this use and how to know where the gimbal ends up after the input?
Never argue with an idiot, he'll drag you down to his level and beat you with experience...
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04-26-2009 06:29 PM  10 years ago
CKY

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Sunshine Coast, BC, Canada

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If rotation speed is not a problem, the 360 servo is the way to go. Hitec now has two robot servos. One is proprietary to LinxMotion, the other is open source, hrs1425 I think. Both are cheap, modified, with wide deadband.

I use an O-ring belt/V-groove and gear combo. gives about 4-6 second rotations. With limiters(stops) the mount will only go so far, the O-ring allows for slippage if trying to over travel.

By adjusting the ATV of the channel for servo speed and adding expo to the travel, a nice proportional movement can be had.

Stick center, no movement, move stick beyond the deadband area and the rotation speed is nicely variable.

Forget any gyro stabalization though.

Chris
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04-26-2009 08:06 PM  10 years ago
daytonabeach

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Oslo, Norway

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Chris, when you fly solo for stills and want to tilt the gimbal up or down during flight, how will you know were the gimbal ends up after a short input from your tx?Never argue with an idiot, he'll drag you down to his level and beat you with experience...
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04-26-2009 08:41 PM  10 years ago
vrwired

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Boulder County, CO

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hmmm. anyone have any experience with the servo stretcher?
http://www.servocity.com/html/180o_servo_stretcher.html

Looks interesting... i am using a cheap HS-422 analog servo.. it is not smooth... it does not rotate smoothly.. it seems to move in very small steps.. an utter no go for video.. I think I need a better servo also...

hs422:
http://www.servocity.com/html/hs-422_super_sport_.html

I may go 360 with stops.. or.. who knows.. my main goal is to get it to stop moving and not return to center.. which looks like I may be able to do with a slider on my X9303 like daytonabeach is talking about...
JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D
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04-26-2009 08:46 PM  10 years ago
CKY

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Sunshine Coast, BC, Canada

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Never flew solo. Always had my daughter as the photograper.

If solo I could suggest hardmounting the camera for tilt and aim the heli. It is a one shot flight, a little preplanning, but if you get one killer shot per flight you are way ahead of most.

Torsten from Germany posts here occasionally. His solo shots are pretty darn good.

Chris

PS...Vwired, I have used the servo stretchers. They do work, but they are not as small as I would like. You still have to modify the servos.
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04-26-2009 08:52 PM  10 years ago
daytonabeach

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Oslo, Norway

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I always preset set camera to about 45 degr or an angle that suits best each assignments, fly around in different angels, change alt and maybe tilt down at the end to get the long shots with the scenery in the background along with the object beneath.

One killer shot is not enough for each assignment, always need 4-5 pics.

I also always get the shots i want that way, but im so tired of changing gimbals all the time
Never argue with an idiot, he'll drag you down to his level and beat you with experience...
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04-26-2009 09:33 PM  10 years ago
vrwired

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Boulder County, CO

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CKY
So .. just a 360 mod needs to be done for the server stretcher? or?
Or maybe just cut the stopper off? no need for the 2.2 transister addition?
Thanks
JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D
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04-27-2009 03:06 AM  10 years ago
CKY

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Sunshine Coast, BC, Canada

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I found this the easiest way to go.

Plug in the servo, make sure the channel is electronically centered, turn pot till motor stops turning, dab of glue, done.

I'm sure there are other ways, but this works for me. Do NOT use a coreless servo. It has no holding power, free wheels too easily. Cored motors have a lot of drag, which is good.

Chris
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04-27-2009 09:25 AM  10 years ago
fionn

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Ireland

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Thats exactly how I've been doing it aswell, no extra parts required, no soldering and very easy to do.
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04-27-2009 04:48 PM  10 years ago
vrwired

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Boulder County, CO

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Thanks CKY.
So it looks like you are just rotating the pot to find the deadband... same as putting in the transistor which create the deadband also.. so just find the deadband spot on the pot (i like saying that) heh..

And just cut the rotator arm off...
JR GSR260 - Mark IV Cam Mount
Trex 600NSP
Trex 600 to 700 Stretch
Trex 450SE
Hornet X3D
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04-27-2009 11:48 PM  10 years ago
CKY

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Sunshine Coast, BC, Canada

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Bob' your uncle :-)
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04-29-2009 03:07 PM  10 years ago
Envision

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MI

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I removed a pot and soldered in the correct resisters but the servo lost all of its holding power.

Troy
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04-29-2009 05:50 PM  10 years ago
CKY

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Sunshine Coast, BC, Canada

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Balance, gearing and using a cored servo (one that is hard to turn by hand) are key when using 360 servos.
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