Impressive work man, seems like you're getting a lot of flak for using leadscrews but you can't beat the torque ratio over belt drive... I bet some ball screws with higher thread pitch would give the feed rates you're looking for w/o losing much of the strength... Wonder if you could do lightweight CNC work (foam/wax/mold milling?) with a structure like this.
but you can do rolamite with a toothed belt. attach the stepper to one of the wheels in the rolamite and you have a highly accurate, almost frictionless rack-and-pinion system.
@aggrav8d Rolamite (by Donald Wilkes) is a linear bearing, not a drive mechanism. I could replace the linear bearings with one, but I would still require a method of drive which is the main problem. A toothed belt seems the best solution at the moment.
The robot moves in all 3 axes including Z axis. The robot is very slow and I suggest any future designs should be based on toothed belt drive. The lead screws wobble and transmit this to the tool head. Firmware for this robot is available from the Helium Frog website.
a beautiful machine. a tad slow but i would assume it is very precise and would make a wonderful 3d printer. you should look into using makerbot software to control it.
i had a similar idea a few months ago but ended up choosing timing belts over the lead screws due to the speed advantage.
Impressive work man, seems like you're getting a lot of flak for using leadscrews but you can't beat the torque ratio over belt drive... I bet some ball screws with higher thread pitch would give the feed rates you're looking for w/o losing much of the strength... Wonder if you could do lightweight CNC work (foam/wax/mold milling?) with a structure like this.
webdext 3 months ago
The sound of the whirring motor sounds as if it make a music... =O
Tagraff 6 months ago
but you can do rolamite with a toothed belt. attach the stepper to one of the wheels in the rolamite and you have a highly accurate, almost frictionless rack-and-pinion system.
aggrav8d 9 months ago
What about Rolamite instead of worm gear?
aggrav8d 9 months ago
@aggrav8d Rolamite (by Donald Wilkes) is a linear bearing, not a drive mechanism. I could replace the linear bearings with one, but I would still require a method of drive which is the main problem. A toothed belt seems the best solution at the moment.
martincprice 9 months ago
The robot moves in all 3 axes including Z axis. The robot is very slow and I suggest any future designs should be based on toothed belt drive. The lead screws wobble and transmit this to the tool head. Firmware for this robot is available from the Helium Frog website.
martincprice 11 months ago
can it go up and down also? this will be amazing!
manofskill 11 months ago
Very nice work! Should be greater than the pitch axis. Good luck with your development! Please check out my experiment:
hg5bsd 11 months ago
a beautiful machine. a tad slow but i would assume it is very precise and would make a wonderful 3d printer. you should look into using makerbot software to control it.
i had a similar idea a few months ago but ended up choosing timing belts over the lead screws due to the speed advantage.
budsiskos 1 year ago
The camera is a little bit shaky; could you put in one video with the camera on a tripod?
ranthoron 1 year ago
When i first saw it thought it going to walk!
Not sure what this has to do with Helium Frog but cool.
As always the pleasure is all mine.
MADABOUTLEGO 1 year ago