humulus, 3 months ago Hmmmmm....
Hmmmmm....
humulus, 3 months ago More part.
More part.
humulus, 3 months ago Testing the movement of a four-marker polar plotter. A disk of plastic with four holes for markers to pass through. Marker holders move in/out, and rotate together.
Testing the movement of a four-marker polar plotter. A disk of plastic with four holes for markers to pass through. Marker holders move in/out, and rotate together.
humulus, 3 months ago capstan drive image/png
capstan drive
image/png
humulus, 3 months ago now it's just a simple matter of programming ... and wires. image/png
now it's just a simple matter of programming
... and wires.
humulus, 3 months ago Hope this is enough stroke. video/mp4
Hope this is enough stroke.
video/mp4
humulus, 3 months ago Hokay. Things I was worried about being problems are, in fact, problems. Having a bunch of weight out on the end of the four-bar linkages messes up the kinematics and makes the whole thing wobbly. The steppers are also not quite powerful enough to lift this fairly heavy creature up the wall. The next iteration will move the X and Y steppers inboard. I'll also have to add some gear reduction to the steppers.
Hokay. Things I was worried about being problems are, in fact, problems.
Having a bunch of weight out on the end of the four-bar linkages messes up the kinematics and makes the whole thing wobbly.
The steppers are also not quite powerful enough to lift this fairly heavy creature up the wall.
The next iteration will move the X and Y steppers inboard.
I'll also have to add some gear reduction to the steppers.
humulus, 3 months ago :catjam: video/mp4
:catjam:
humulus, 3 months ago Clock spring from amazon $10. Clock spring from Harbor Freight tape measure: $2.50. A sprung reel stolen from $2 tape measure, mounted on top of a 3D printed spur gear, sitting on a bench strewn with bearings.
Clock spring from amazon $10. Clock spring from Harbor Freight tape measure: $2.50.
A sprung reel stolen from $2 tape measure, mounted on top of a 3D printed spur gear, sitting on a bench strewn with bearings.
humulus, 3 months ago Feeling good about this iteration. Got enough of it drawn that the print queue won't finish until after work.
Feeling good about this iteration. Got enough of it drawn that the print queue won't finish until after work.
humulus, 3 months ago So far, so good. This version might actually work. The knob in the center adjusts the take up tension. The cable is thinner and the path is free of friction. There's also twice the gear reduction compared to the previous iteration. A polar plotter, side view, showing the cable feed.
So far, so good. This version might actually work.
The knob in the center adjusts the take up tension. The cable is thinner and the path is free of friction. There's also twice the gear reduction compared to the previous iteration.
A polar plotter, side view, showing the cable feed.
humulus, 3 months ago he scribblin.
he scribblin.
humulus, 2 months ago hmmmm Gears driving the reels of a polar plotter.
hmmmm
Gears driving the reels of a polar plotter.
humulus, 2 months ago Looking for the gcode to not fall like a stone to the floor after finishing a print. Polar plotter drawing a coastline in brown sharpie on a sheet of butcher paper taped to the wall.
Looking for the gcode to not fall like a stone to the floor after finishing a print.
Polar plotter drawing a coastline in brown sharpie on a sheet of butcher paper taped to the wall.
humulus, 25 days ago out with floppy arms, in with entomoid mouth parts.
out with floppy arms, in with entomoid mouth parts.
ifixcoinops, 25 days ago @humulus mmm, fleshy
@humulus mmm, fleshy
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