[FTC]: New 1/4 scale servos

[PhilBot]

I'm excited that FTC allows the larger 1/4 Scale servos this year.

I purchased one of each servo HS-755HB and HS-785HB

The 775 works as expected (180 rotation) tons of torque

The 785HB is weird though. It's listed as a 3.5 Turn Sail winch motor.
So I was expecting the same control as the 775, except just expanded to more turns.

However, the wheel turns way more than 3.5 turns.

Using the LavVIEW Schematic Diagram to control the servo, if I change the servo value from 5 to 255 I get about 8 turns of motion. It's very precise and normal except for the WAY expanded range. Setting the value too 100 will always return it to the same position.

However if I choose a servo value of less than 5 (like 0 for example) the servo turns slowly Counter Clockwise, and keeps turning forever. So, clearly no mechanical stop, but what's worse is that once it's run like this for a while, if I set the position back to a reasonable value (like 100) it doesn't go back to the same position that used to correspond to 100.


So it's not like a normal servo with absolute positioning, and it's not like a continuous rotation servo (since it only runs continually in one direction).

I've search all the hitec sites and they all say 3.5 turns...

Anyone have any experience with this servo..... It seems like the 0 code is a way to "home" the servo....

Phil

[Andrew Rudolph]

Great info! Have you learned anything new about the servos or used them on a mechanism on a bot yet?