RX-28M

Bioloid robot kit from Korean company Robotis; CM5 controller block, AX12 servos..
7 postsPage 1 of 1
7 postsPage 1 of 1

RX-28M

Post by Bullit » Sat Feb 26, 2011 4:52 am

Post by Bullit
Sat Feb 26, 2011 4:52 am

I thought I'd share a few photos of the internals of the new Robotis RX-28M dynamixel.
These new servos are very impressive with their magnetic encoder they have very little backlash and no servo whine that I've heard thus far.
It appears that the case and gears are identical to the RX-28 however the electronics are entirely different.
On the final output gear shaft is the diametral NIB magnet.

Image

Image

Image

Image

Image

Image

ibot I knew you'd like this :lol:
I thought I'd share a few photos of the internals of the new Robotis RX-28M dynamixel.
These new servos are very impressive with their magnetic encoder they have very little backlash and no servo whine that I've heard thus far.
It appears that the case and gears are identical to the RX-28 however the electronics are entirely different.
On the final output gear shaft is the diametral NIB magnet.

Image

Image

Image

Image

Image

Image

ibot I knew you'd like this :lol:
Bullit offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 291
Joined: Wed May 31, 2006 1:00 am
Location: Near robot

Post by Gort » Sat Feb 26, 2011 6:19 am

Post by Gort
Sat Feb 26, 2011 6:19 am

very cool! thanks for posting!
very cool! thanks for posting!
Gort offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 555
Joined: Wed May 31, 2006 1:00 am
Location: KC, MO, USA

Post by i-Bot » Sat Feb 26, 2011 11:10 am

Post by i-Bot
Sat Feb 26, 2011 11:10 am

Thx. Bullit for posting the photos.

Is the motor the same as the RX28 ? The largest part of the RX28 cost appeared to be in the Maxon motor.

With the STM32 processor supporting 4.5M speed, then I guess we will see something more of the Dynamixel 2 protocol and maybe some more interesting PID parameters, though the documents here
http://darwin-op.springnote.com/pages/7239533
do not show any support for 4.5M or any other differences.

The encoder adds about $5 to component cost and the STM32 about $4. There is now also a 3.3V regulator, but they also went from the previous H bridge driver to MOS transistors. So component cost added is less than 10$, and build cost and increased reliability should also bring down cost. Do you have an ballpark price yet?
Thx. Bullit for posting the photos.

Is the motor the same as the RX28 ? The largest part of the RX28 cost appeared to be in the Maxon motor.

With the STM32 processor supporting 4.5M speed, then I guess we will see something more of the Dynamixel 2 protocol and maybe some more interesting PID parameters, though the documents here
http://darwin-op.springnote.com/pages/7239533
do not show any support for 4.5M or any other differences.

The encoder adds about $5 to component cost and the STM32 about $4. There is now also a 3.3V regulator, but they also went from the previous H bridge driver to MOS transistors. So component cost added is less than 10$, and build cost and increased reliability should also bring down cost. Do you have an ballpark price yet?
i-Bot offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 1142
Joined: Wed May 17, 2006 1:00 am

Re: Ax12+

Post by siempre.aprendiendo » Sat Feb 26, 2011 11:14 am

Post by siempre.aprendiendo
Sat Feb 26, 2011 11:14 am

MOHIT JINDAL wrote:Hi,
Can anyone take photos of inside of Ax12+ :roll:
Thanks.


Some time ago someone published several photos of an "opened" AX-12+ in this forum (I think). Try with the forum search or Google/Yahoo/...
MOHIT JINDAL wrote:Hi,
Can anyone take photos of inside of Ax12+ :roll:
Thanks.


Some time ago someone published several photos of an "opened" AX-12+ in this forum (I think). Try with the forum search or Google/Yahoo/...
siempre.aprendiendo offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 559
Joined: Wed Aug 08, 2007 9:13 pm
Location: Barcelona

Post by i-Bot » Sat Feb 26, 2011 11:44 am

Post by i-Bot
Sat Feb 26, 2011 11:44 am

MOHIT,

If you READ the wiki:
http://robosavvy.com/site/index.php?option=com_openwiki&Itemid=&id=robotis_bioloid
You will find a dissection there.
MOHIT,

If you READ the wiki:
http://robosavvy.com/site/index.php?option=com_openwiki&Itemid=&id=robotis_bioloid
You will find a dissection there.
i-Bot offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 1142
Joined: Wed May 17, 2006 1:00 am

Post by Bullit » Sat Feb 26, 2011 1:29 pm

Post by Bullit
Sat Feb 26, 2011 1:29 pm

The motor is a Maxxon RE-max. I didn't measure it but it appears the same as one in the RX-28.
The motor is a Maxxon RE-max. I didn't measure it but it appears the same as one in the RX-28.
Bullit offline
Savvy Roboteer
Savvy Roboteer
User avatar
Posts: 291
Joined: Wed May 31, 2006 1:00 am
Location: Near robot

Post by MOHIT JINDAL » Tue Sep 04, 2012 5:17 am

Post by MOHIT JINDAL
Tue Sep 04, 2012 5:17 am

I am wondering anyone tried to Draw the Schematic of MX-28 ? :roll:
I am wondering anyone tried to Draw the Schematic of MX-28 ? :roll:
MOHIT JINDAL offline
Savvy Roboteer
Savvy Roboteer
Posts: 178
Joined: Wed Nov 10, 2010 7:43 am


7 postsPage 1 of 1
7 postsPage 1 of 1