Thanks! The drawings it makes are cool too. I'm currently designing an enclosure that should look a bit nicer than my hexagonal melamine particle board atrocity.
Excellent! Wouldn't work nearly as well without the sparkly glue stick. 😜 Three-pack of steppers is because they think everyone has X, Y, & Z axes... you're bucking the system.
Pack of 3 = x y z axis Pack of five = x,y,z1 and z2 + extruder (ie mendel) You creators are working very hard to persuade me to buy a laser cutter! awesome job Travis
Hey! I've just pushed up DXFs for all the lasercut parts here: github.com/tjhowse/sand_drawing/tree/master/scad/lasercut_v2_dxfs . I don't yet have any updated documentation to show how these parts go together. I hope the videos will be sufficient documentation until I can put together something better.
Do you really need the pulleys? I'm building a SCARA robot also with the first arm driven directly off the stepper. With micro steps it seems fine enough. The second arm too is driven directly from another stepper on the first arm, no pulley. It is a much smaller and lighter stepper.
I'm not sure if I understand. Do you have a diagram or video of your setup? The belts aren't there for reduction - they're there to pass the torque through to the moving parts without slip rings.
@@tjhowse I have the arms mounted directly to the output shaft of the stepper. i.e. the arms have a hole that the splined shaft of the stepper fits into. So when the stepper rotates its shaft, the arm rotates. I don't have a video on it or anything, i have not seen anyone do it this way, they all have gears or belts from the stepper to the arms. I can email you a pic of my setup if that helps. Is your email on the youtube channel?
@@murraymadness4674 So you have one stepper mounted to the base, with an arm attached to that stepper. The second stepper is mounted to the first arm, and the second arm is mounted to the second stepper? How do you get power to the second stepper? I'm not sure I'm understanding properly.
@@tjhowse In my case I just run the second arm servo wires along the first arm. you must need continuous rotation? So then you can use the slip rings for the second servo, or power it with a battery and send the positioning to it wireless, say using a esp8266. The sand drawing is cool having the ball move 'by itself'. But then it limits the picture to have a continuous line, and thought can you make the ball levitate using a negative force field to position it to another spot without writing in the sand? That would be even more fascinating, make it jump from one spot to another. And will the ball be covered with something that looks like a bug?
Transmitting stepper control lines through a slip ring is theoretically possible, but it's a noisy, relatively high-power, signal that is intolerant of momentary interruptions. Far more challenging and expensive than using belt driven pulleys. The same applies for the battery+wireless approach. These are all solvable problems, but belts are cheap and work great. On the other hand; magnetically levitating a non a non-spinning object at room temperature is currently impossible.
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I've seen a similar design on an automatic chess playing bot, but this seems much cheaper and easier to reproduce! Very cool.
Thanks! Have you got a link to that? It might have some interesting design details I could learn from.
Workshop is looking great mate. Looking forward to seeing this project revision take shape.
That mechanism is beautiful!
Thanks! The drawings it makes are cool too. I'm currently designing an enclosure that should look a bit nicer than my hexagonal melamine particle board atrocity.
Excellent! Wouldn't work nearly as well without the sparkly glue stick. 😜
Three-pack of steppers is because they think everyone has X, Y, & Z axes... you're bucking the system.
Pack of 3 = x y z axis
Pack of five = x,y,z1 and z2 + extruder (ie mendel)
You creators are working very hard to persuade me to buy a laser cutter! awesome job Travis
Thanks very much! I appreciate it.
Amazing, exactly the mechanism I've been trying to find!
Would you be able to share the 2d files to laser-cut?
Hey! I've just pushed up DXFs for all the lasercut parts here: github.com/tjhowse/sand_drawing/tree/master/scad/lasercut_v2_dxfs . I don't yet have any updated documentation to show how these parts go together. I hope the videos will be sufficient documentation until I can put together something better.
Do you really need the pulleys? I'm building a SCARA robot also with the first arm driven directly off the stepper. With micro steps it seems fine enough. The second arm too is driven directly from another stepper on the first arm, no pulley. It is a much smaller and lighter stepper.
I'm not sure if I understand. Do you have a diagram or video of your setup?
The belts aren't there for reduction - they're there to pass the torque through to the moving parts without slip rings.
@@tjhowse I have the arms mounted directly to the output shaft of the stepper.
i.e. the arms have a hole that the splined shaft of the stepper fits into. So when the stepper rotates its shaft, the arm rotates.
I don't have a video on it or anything, i have not seen anyone do it this way, they all have gears or belts from the stepper to the arms. I can email you a pic of my setup if that helps. Is your email on the youtube channel?
@@murraymadness4674 So you have one stepper mounted to the base, with an arm attached to that stepper. The second stepper is mounted to the first arm, and the second arm is mounted to the second stepper? How do you get power to the second stepper? I'm not sure I'm understanding properly.
@@tjhowse In my case I just run the second arm servo wires along the first arm. you must need continuous rotation?
So then you can use the slip rings for the second servo, or power it with a battery and send the positioning to it wireless, say using a esp8266.
The sand drawing is cool having the ball move 'by itself'. But then it limits the picture to have a continuous line, and thought can you make the ball levitate using a negative force field to position it to another spot without writing in the sand?
That would be even more fascinating, make it jump from one spot to another. And will the ball be covered with something that looks like a bug?
Transmitting stepper control lines through a slip ring is theoretically possible, but it's a noisy, relatively high-power, signal that is intolerant of momentary interruptions. Far more challenging and expensive than using belt driven pulleys. The same applies for the battery+wireless approach. These are all solvable problems, but belts are cheap and work great.
On the other hand; magnetically levitating a non a non-spinning object at room temperature is currently impossible.