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SERVO TESTER

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Old 11-08-2005, 11:26 AM
  #1  
iaclmac
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Default SERVO TESTER

Hi All ...
What I am looking for is an inexpensive servo tester. My plans are to be able to use it in the shop to run a servo through its full range of motion. In essence to be able to set up the throws distances properly. Now I know I can always use the transmitter. But why drag a good transmitter into a dusty and dirty workshop. Surely there must be a cheap piece of test equipment out there.
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Old 11-08-2005, 03:41 PM
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FMA Servo Lab

http://www2.towerhobbies.com/cgi-bin...?&I=LXJVD9&P=7
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Old 11-08-2005, 08:42 PM
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David DeWitt
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VEXA Control

http://www.vexacontrol.com/
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Old 11-13-2005, 11:34 AM
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I think this is a great little unit that everyone should have:

http://www.hobbypeople.net/gallery/518105.asp

For $20 it is the easiest and cheapest way to set up a plane that I have found.
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Old 11-13-2005, 05:30 PM
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spritefiend
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id have to agree with, David DeWitt. Spoke to someone about the the fma servo lab compared to the vexa control unit, and it looks like vexa is the way to go.
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Old 11-13-2005, 08:08 PM
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mr_matt
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The Vexa represents the best money I have spent on a tool in years. Absolutely worth every penny. Awesome piece of gear and a great company.
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Old 11-13-2005, 09:50 PM
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Well, it figures...I just ordered an FMA Servo Lab last week, and it will probably arrive tomorrow. Now that I have seen the Vexa, I have to have one. And if that wasn't enough, Vexa is based in Ocala, Florida, which is just over an hour away from my home. Oh well, just more money. (And yes, I'm the guy that ALWAYS gets the shopping cart with the wobbly wheel!)
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Old 11-14-2005, 05:57 AM
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As long as we're on the subject of "servo testing", I'd actually like to test some old servos and find out their speed and torque. Do either of these two testers actually help with that or do they just find the center and maybe work the arm back and forth?

I figure the torque test should be out of possibility for any simple electrical device. It would seem that some kind of external scale would be required. But seems the speed check ought to be possible.
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Old 11-14-2005, 12:25 PM
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Default RE: SERVO TESTER

The Vexa is an excellent choice.
I've had mine a couple of years and wouldn't be without it.
I have the original Servo Exciter that didn't have all the features of the current model.

Greg
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Old 11-14-2005, 04:44 PM
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ORIGINAL: darock

As long as we're on the subject of "servo testing", I'd actually like to test some old servos and find out their speed and torque. Do either of these two testers actually help with that or do they just find the center and maybe work the arm back and forth?

I figure the torque test should be out of possibility for any simple electrical device. It would seem that some kind of external scale would be required. But seems the speed check ought to be possible.
The Vexa tester will generate the pulse but you will have to rig up something to measure the torque. I use a digital fish scale from Wall Mart.
I have a rig for measuring transit time but it involves about $400 in test equipment.
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Old 11-19-2005, 10:11 AM
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Antique
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How about a DIY circuit ? Anybody got one ?
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Old 11-20-2005, 11:42 PM
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What is a DYI circuit....never seen one? Thanks Capt,n
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Old 11-21-2005, 05:44 AM
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Default RE: SERVO TESTER

An FYI, on the DIY,

Do It Yourself...
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Old 11-21-2005, 08:19 AM
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Default RE: SERVO TESTER

I have the "servociser" from Maxx Products and it is one of my favorite tools. If I needed to replace it for some reason, I'd spend the extra money and get the Vexa ServoXciter.

Good flying,
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Old 11-21-2005, 08:45 AM
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Default RE: SERVO TESTER

Down and dirty Servo gear test that costs nothing.

Clamp the servo to the bench with the servo arm hanging over the side. Tie a string through the 1/2” hole in the servo arm. Tie the other end to a Coke bottle sitting on the floor. In the 1/2” hole a 50 in. oz servo should easily pick up a 2 Liter (approx 64oz) bottle full of water. Actually the servo should pick up 100oz of weight.

Bill
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Old 11-21-2005, 09:04 AM
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Default RE: SERVO TESTER

Just for informational purposes, a 2 liter bottle of Coke weighs about 4 pounds 13-14 ounces or about 77-78 ounces.
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Old 11-21-2005, 09:27 AM
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I use my 9C.
If you don't want to have your TX in the workshop then just raise the antenna and cycle the servos.
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Old 11-21-2005, 11:51 AM
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Default RE: SERVO TESTER

darock,

By golly you are correct. The density of Coke must be a little greater than water (about 13%). Who would have thunk it?

Bill
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Old 01-04-2006, 10:33 PM
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Default RE: SERVO TESTER

Any other ideas on testing servos? Thanks Capt,n
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Old 01-05-2006, 09:53 AM
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Default RE: SERVO TESTER

For those that don't DIY, I am selling a CD that has torque vs error signal plots for 26 popular servos. It also has current vs torque plots for about ten of those and linearity plots for about 15 of the servos.
PM me for the price
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Old 01-05-2006, 01:01 PM
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Default RE: SERVO TESTER

How much more information (or usefulness) would i get by usign the Vexa vs. the FMA unit?

Considering that before (until now) i have never tested my servos, and that everything we do requieres a learning curve... Is it features or quality of information that should convince me to buy the vexa or the FMA?
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Old 01-05-2006, 02:02 PM
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ORIGINAL: bob_nj

An FYI, on the DIY,

Do It Yourself...
I have built a couple from this:

http://www.schumacher.clara.net/servodriver.htm

Pretty simple circuit, just make sure you get the correct components. radio Shack has them.
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Old 01-05-2006, 04:05 PM
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ORIGINAL: SwampFlier-RCU

How much more information (or usefulness) would i get by usign the Vexa vs. the FMA unit?

Considering that before (until now) i have never tested my servos, and that everything we do requieres a learning curve... Is it features or quality of information that should convince me to buy the vexa or the FMA?
The Vexa does everything the FMA unit does + you can measure the servo deadband and current. It also will measure the pulse width of your receiver pulse. It has a glitch counter so you can use it as a detector during your range check. You hook up the pulse detector to a spare channel and do your walk out. When you return you look at the glitch detector to see if any pulses were missed. Its much better than trying to eyeball the rudder
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Old 02-21-2006, 06:06 PM
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[link=http://www.rcgroups.com/forums/showthread.php?t=459568]YTV Cycler[/link]

$18 shipped in the US.

Micro processor driven
Center guaranteed 1.5ms
Manual adjust in 1400 steps
Sweep mode with 10 sweep speeds
Dual servo driver
Two ranges - 1-2ms and .8-2.2ms
Size of a matchbook
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Old 02-21-2006, 06:58 PM
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Default RE: SERVO TESTER

Left seat, could you please give me the website of this servo tester? I can't access rcgroups.

TX
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