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Help w/ servo elevation

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Old 03-03-2013, 03:31 PM
  #1
DaveBcool
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Default Help w/ servo elevation

This my second attempt at installing a servo for elevation in my tammy pershing...
I am using a 4ch Futaba 2.4 gHz w/ a fire button installed.
This is the sequence from the DMD to the servo.

Receiver > Dual Servo Extension Slot 1 > Tamiya Electronics Channel 3
Dual Servo Extension Slot 2 > 6" extension > Servo Rate Reducer > Micro servo

The elevation works fine.
The problem is when I fire, the servo "hops" a bit, enough to redirect the barrel.

I have tried to insert 1 or 2 more rate reducers in sequence.
The more I add, the less it hops when I fire.
However, with 3 rate reducers installed, the servo twitches the whole time.

Any thoughts?


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Old 03-03-2013, 03:54 PM
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TheBennyB
 
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Default RE: Help w/ servo elevation

Maybe a DMD/MF recalibration with the rate reducers installed?
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Old 03-03-2013, 06:10 PM
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DaveBcool
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Default RE: Help w/ servo elevation

Thanks Brett, I'll giver a try.
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Old 03-04-2013, 01:47 PM
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NCKT
 
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Default RE: Help w/ servo elevation

Also, you may not be able to get rid of the "hop/twitch" entirely, depending on which type of fire button you use. I've used the momentary toggle type (triainer switch on a futaba) and that's the worst for this problem, second worst was the "radio shack" fire button. I use the click-y type buttons for firing. They are the type discussed here in this thread:
http://www.heatarmor.com/phpbb/viewtopic.php?f=12&t=689
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Old 03-04-2013, 03:59 PM
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DaveBcool
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Default RE: Help w/ servo elevation

Yeah, I tried again today and re-set everything.
It was still a bit twitchy and jumpy.
Also, another problem arose after I took out the self centering spring on the Tx.
After I move the stick up or down 3 or 4 notches, the sound for the barrel elevation comes on and stays on.
Therefore, I cannot fire while it makes this sound.

I know guys use servos for elevation, what the hell am I doing wrong?

NCKT
I have a clicky button installed, along with a VBT (vibrating unit)

I also tried my Panther Tx, which has a Radio Shack cheap o rama momentary switch w/ no VBT.
It does the same thing.
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Old 03-04-2013, 06:39 PM
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Jeff489
 
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Default RE: Help w/ servo elevation

I've never used rate reducers on mine (done it on about 10 so far).  I have always used the Dionysis camera positioner switches.  Never had any jumps or twitches.
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Old 03-04-2013, 07:29 PM
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TheBennyB
 
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Default RE: Help w/ servo elevation

Dave,
Thought you knew of the elevation noise problem. Yup, can't fire when the elevation or depression sound is going. Most guys are using 5+ channel radios and
have it mixed into different channels. To stay with a 4 channel set up you'll need to get a camera mount servo delay. It slows the servo, but also stops it in positon so you
don't have to remove the self centering stick. I learned the hard way as well. For years I was doing elevation/depression fan shots with my PZ III since I had to elevate, let go of stick, then fire before my
barrel got off target.

http://dionysusdesign.com/product_in...fabaf3ab69fdf1



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