Servo not reaching full travel

[ruijc]

Acetronics,

true about that...

BUT

If it wasnt for skimask i woudnt be able to get that extra travel


PS. - do you have the link for the s3152 datasheet ?
.

[mister_e]

http://www.gpdealera.com/cgi-bin/wga...pgm?I=FUTM0311

[ruijc]

Thanks mister_e,

" the neutral is at 1310ms " ... weird

.

[Acetronics2]

Thanks mister_e,

" the neutral is at 1310ms " ... weird

.

Nooooooooooooo,

Those OLD systems HAD a 1310 µs neutral ... from Robbe ( German brand ); Lextronic ( French brand ) and Multiplex had a 1.65 ms neutral, KRAFT ( US ) had a 1.70 or 1.80 ms neutral ...

Now, it's 1500µs for Everyone !!!

Alain

[skimask]

Thanks Alain...a lot of good info I wasn't even aware existed...
I would've figure since these were servos in fast moving vehicles that they would've been a bit 'tighter' from day 1, with all the damage they could possibly inflict.
More info to stuff in the head for future use...

[Acetronics2]

Hi,

a little gadget for your servos ...

xxx...84 shows the auto left>right>left>right ...etc. function
xxx...84+ shows no auto function but allows a different neutral setting and memorizing ... and 1500µs recovering.

note ... C4 is a little 1206 size CMS .22µ capacitor placed just between V+ and GND PIC pins, ... on the copper side !!!

a Happy new year to Everyone !!!

Alain

[ruijc]

Thanks Alain

Will have a look

.

[Acetronics2]

Hi, Ruijc

Having tortured ( also build and modified ...) dozens of servos ...

I can tell you EVEN Analog ones do not meet your requirements , as the linear response of futaba analog servos is only about 1/2 of the physical range ...

for the full mechanical travel of a S3001, I've measured the pulse width from 200 µs ( full left ) to 2500µs ( full right ) with an awful ( LOL ) non-linearity between 200 and 800 µs ...

Now ... Digital. " a 1.3 ms neutral won't work... " ... as classical travel is +/- 0.5 ms
that means roughly only .9 to 2.1ms range will be accepted by the digital "amplifier" ... or will give a proportionnal output.


STOP DREAMING this servo will NEVER REACH ITS PHYSICAL LIMITS !!! otherwise, that would mean you can burn the output stage of the amp ...


Skimask's lines permit you to measure the input range of your servo ... cause exploring from 100 to 2900 µS.
You're then sure you've seen ALL the travel your servo gan give ... no need to try to get more, unless modifying the servo amp factory settings !!!

Alain