PDA

View Full Version : [Question(s)] Ax-12 vs HSR-8498



Omegaspecter
03-14-2009, 05:54 PM
I am looking at these two servo's because seem to be the 'entry' level digital servo's for robotics. Are there big diffrences between the two that should be considered before I decide which way to go? Is that main diffrence what I'll have to do to control them?

MikeG
03-14-2009, 08:14 PM
Correct the main difference is how the servos are controlled; the HSR-8498 (http://www.hitecrcd.com/servos/show?name=HSR-8498HB) use Pulse Width Modulation (PWM). The AX-12 (http://www.crustcrawler.com/products/bioloid/docs/AX-12.pdf) uses serial TTL at 1Mpbs.

lnxfergy
03-14-2009, 08:40 PM
Mounting is also a big difference. The HSRs follow the design of 30years worth of servos, and would be compatible with things like the Lynxmotion SES. The AX-12s are a complete physical, and electrical, redesign of the standard servo. They have a very different mounting system -- however, the kits include lots of brackets to build everything you ever wanted, and don't let the plastic discourage you -- you'd be hard-pressed to break a bracket with your own hands, and the servos are never gonna snap one.

-Fergs

MikeG
03-16-2009, 01:06 AM
Another difference is the AX-12 can report position, speed, load, temperature, and voltage.

sthmck
03-16-2009, 06:19 AM
You can also have preset parameters that keep it from going above certain points. There is also a thermal shutdown feature.

DresnerRobotics
03-16-2009, 10:07 AM
AX-12 is also considerably stronger. And cheaper...

Adrenalynn
03-16-2009, 01:52 PM
Another difference is the AX-12 can report position, speed, load, temperature, and voltage.

And heavens know that temp reporting and shutdown are NICE features. Something I could have used on the 805BB the other day. Not only were we overheating it, when I reached down and grabbed the bot to move it, I ended-up with a second-degree burn.

Knowing what the servo is actually doing is a GoodThing.