Tiny Coffeemug Delta w. Mag-rods [WiP]
Posted by o_lampe
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Tiny Coffeemug Delta w. Mag-rods [WiP] February 01, 2018 06:26AM |
It's so cute, I have to show you a few pics.
The Mag-rods are made with Traxxas balls, 4x10mm N50 magnets glued in 5x0.5mm brass tubes ( 40mm long )
It's a lot of work to grind down the brass tubes until they allow a decent amount of sideways travel.
The carriers are as tiny as I could make them. They run pretty smooth on the 3mm rods. I haven't cut the thread for the lead screws yet, so I mounted them the wrong way. I just had to see the effector in action.
It might not produce any useful things, maybe I add a laserdiode for engraving or try to make a tiny hotend. We'll see.
Next step is to wire the steppers. I want to put the drivers on the outside of the sheetmetal and an Arduino Nano? underneath. Does Teacup work with Deltas?
The Mag-rods are made with Traxxas balls, 4x10mm N50 magnets glued in 5x0.5mm brass tubes ( 40mm long )
It's a lot of work to grind down the brass tubes until they allow a decent amount of sideways travel.
The carriers are as tiny as I could make them. They run pretty smooth on the 3mm rods. I haven't cut the thread for the lead screws yet, so I mounted them the wrong way. I just had to see the effector in action.
It might not produce any useful things, maybe I add a laserdiode for engraving or try to make a tiny hotend. We'll see.
Next step is to wire the steppers. I want to put the drivers on the outside of the sheetmetal and an Arduino Nano? underneath. Does Teacup work with Deltas?
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Re: Tiny Coffeemug Delta w. Mag-rods [WiP] February 03, 2018 11:35AM |
I tried to melt the thread into the carriers. It worked OK, but they were way to tight.
So I had to design a helix into the .stl file which took me 12 iterations until I found the best settings for my printer. Now they run smooth and easy. PETG rules
I made a q&d installation with two steppers running parallel on one driver. The third motor is on idle, until I find more A4988 drivers.
Now it runs without racking or skipping at travel speeds of 80mm/s Acceleration is 100mm/s², but It looks unbelievable fast.
Here's a video .
Edited 2 time(s). Last edit at 02/03/2018 11:48AM by o_lampe.
So I had to design a helix into the .stl file which took me 12 iterations until I found the best settings for my printer. Now they run smooth and easy. PETG rules
I made a q&d installation with two steppers running parallel on one driver. The third motor is on idle, until I find more A4988 drivers.
Now it runs without racking or skipping at travel speeds of 80mm/s
Acceleration is 100mm/s², but It looks unbelievable fast.Here's a video .
Edited 2 time(s). Last edit at 02/03/2018 11:48AM by o_lampe.
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Re: Tiny Coffeemug Delta w. Mag-rods [WiP] February 04, 2018 02:39AM |
I might use it to stirr my coffee with a plastic spoon clamped in the effector. What do you think? 
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Re: Tiny Coffeemug Delta w. Mag-rods [WiP] February 05, 2018 12:17PM |
I have to correct myself.
The acceleration was 100mm/s² in Marlin FW, but the eeprom settings were much higher. I noticed it, when I changed something else and hit M502 & M500. *damnMarlincrap*
The stepppers are at the very edge. They got very hot when I raised current, so they would move with effector. ( Vref=0.35V) I added a small heatsink to the sheetmetal, which is supposed to act as a heatsink too. Sure enough, the PLA got soft before I did this.
I also added some grease to the mag-rods/balls.
Made a video were it made some circles, but somehow my i-net connection is very slow and I can't upload it now.
During the testing, I noticed that I could make the diameter bigger. The rod-angles would then be a bit more stepper friendly.
Can't call it coffemug-size then anymore. More like a Cornflakes-bowl...
BTW: Two of the smooth rods are magnetic, the others are stainless. I noticed it, because the mag-arms suddenly sticked to them when they passed by during a very wide circle.
Edited 1 time(s). Last edit at 02/05/2018 12:21PM by o_lampe.
The acceleration was 100mm/s² in Marlin FW, but the eeprom settings were much higher. I noticed it, when I changed something else and hit M502 & M500. *damnMarlincrap*
The stepppers are at the very edge. They got very hot when I raised current, so they would move with effector. ( Vref=0.35V) I added a small heatsink to the sheetmetal, which is supposed to act as a heatsink too. Sure enough, the PLA got soft before I did this.
I also added some grease to the mag-rods/balls.
Made a video were it made some circles, but somehow my i-net connection is very slow and I can't upload it now.
During the testing, I noticed that I could make the diameter bigger. The rod-angles would then be a bit more stepper friendly.
Can't call it coffemug-size then anymore. More like a Cornflakes-bowl...
BTW: Two of the smooth rods are magnetic, the others are stainless. I noticed it, because the mag-arms suddenly sticked to them when they passed by during a very wide circle.
Edited 1 time(s). Last edit at 02/05/2018 12:21PM by o_lampe.
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