Nice!
I like the way it moves so smoothly! I also like the servo mounts. You made them from aluminium window frames? well done!
Oh yes, the mounts are not
Oh yes, the mounts are not difficult to make. Just a bit tired after making 12 different mounts !
More detail!!
Would you take some closeups of the mounts, or perhaps make some sketches, please?
I’ve updated the Servo Mount
I’ve updated the Servo Mount sections, added 2 links to my blog. It is not difficult to make the usual U-mount, as long as you decided how to wrap your servo. Some would like to drill holes on the back plate of the servo and added an extra support plate there. I prefer to wrap it with alum mount that shows in the photo.
The cross-joint is a bit complicated but it can be reproduced easily…one of my net friend is able to make it on S3003.
One critical issue is to find the alum frame material at the right size to fit the servo. Are you able to find some ?
Nope
Sadly not - that’s why I ended up with ducting. The ducting is the perfect size in depth, but nearly three times too wide! (That’s why I cut it in half and ented up with a U-section which was too flexible.)
I’ve just learned something useful about the PVC, though. If I cut a 5mm hole in it and drop it in boiling water for a few seconds, it becomes soft enough that if I press it onto a servo, it cuts its own splines. So I can make my own servo horns which are nearly flat. I’m thinking my Mark II will not use horns at all, but mount the servo head directly to the joints.
I’d really like to find a source of inexpensive servos with two drive heads. You know the ones? They appear to have a drive shaft running right through them which provides a lovely bearing on the “back” side as well.
Why do you want to make a
Why do you want to make a servo horn ? Can you show me a picture ? I use a small circular horn FUTM2020 => http://www.futaba-rc.com/parts/futm1980.html
How do mount the servo head to the joints, without a horn ? I cannot find a good way to do.
I never saw any dual heads servo. If use a dual drive one, the mount will be much more simplier. Or you can consider to drill on one side of the servo and put in the bearing.
Making a servo horn
The problem with servo horns is you have to screw them to the servo then you have to find a way of attaching the horn you your robot. (Four tiny holes that are difficult to line up!)
I don’t really want to make a servo horn. I want to attach the servo directly. Without the use of a horn. The example of a flat servo horn was a step in the right direction because the normal horns add nearly 1cm to the depth of the joint!
Shaft through servos
I thought I’d seen these, but now am not so sure. Looked at some Joinmax servos, but can’t tell if they are all the way through.
Any thoughts to mount the
Any thoughts to mount the shaft of the servo directly ? It has to be flexible (so that you can unmount it if you want to), and strong enough because the torque is huge at a very small diameter.
I’m coming a bit late on
I’m coming a bit late on this project.
I have the OpenSevo Control board matched with the MG995 Servo.
The problem you are having with the reseting problem was exactly the same thing I was having.
Increasing the cap made no difference, but installing a 5-10 ohm resistor in series with the motor stopped the resets.
Keep up the interesting work.
I’ve never tried this. Thank
I’ve never tried this. Thank you for your suggestions.
BTW, if a 5-10 ohm resistor
BTW, if a 5-10 ohm resistor is in series with the motor, the voltage drop on the resistor may be too high when the servo is heavily loaded. It may affect some movements like walk upstairs.
**Awesome! **
Awesome!
hey, regarding digital
hey, regarding digital servos,
i found cheap ones
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=2
do you think this will work