Two rods on one (Delrin-) ball-effector
Posted by o_lampe
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Re: Two rods on one (Delrin-) ball-effector March 24, 2018 05:24AM |
Danke Heinrich 
I just ordered enough POM balls for three printers.
If it doesn't work out, I have to print a marble machine
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Re: Two rods on one (Delrin-) ball-effector March 30, 2018 10:10AM |
I made an effector for the 16mm Delrin balls. It fit's the 55mm rod distance from the Smart Effector, but it looks so small.
I hope, I can fit all the fans and z-probes without fouling the tensioner-string.
I hope, I can fit all the fans and z-probes without fouling the tensioner-string.
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Re: Two rods on one (Delrin-) ball-effector April 02, 2018 03:11AM |
I made some rods from aluminum tube. The only stuff I could get before easter.
The sleeves have dishes in the size of the balls and they fit snuggly on the effector. The rubber rope is pretty loose, but during some test runs, I couldn't manage to provoke a fail. I raised jerk to 1200mm/min and acceleration to 6000mm/s² and upped the speed to 120mm/s. It had to print some nasty honeycomb-infill, the whole printer was shaking, but the rods stayed in place. To make things worse, I added the top heavy Cycloid extruder: no fail. See short video here.
I'm pretty pleased with it. It is exceptional light weight compared to magnetic rods ( and the fans will not stop or brake from magnetic pollution )
PS: I waited until April 2nd to publish it, so expect me to be dead serious...
Edited 1 time(s). Last edit at 04/02/2018 03:16AM by o_lampe.
The sleeves have dishes in the size of the balls and they fit snuggly on the effector. The rubber rope is pretty loose, but during some test runs, I couldn't manage to provoke a fail. I raised jerk to 1200mm/min and acceleration to 6000mm/s² and upped the speed to 120mm/s. It had to print some nasty honeycomb-infill, the whole printer was shaking, but the rods stayed in place. To make things worse, I added the top heavy Cycloid extruder: no fail. See short video here.
I'm pretty pleased with it. It is exceptional light weight compared to magnetic rods ( and the fans will not stop or brake from magnetic pollution )
PS: I waited until April 2nd to publish it, so expect me to be dead serious...
Edited 1 time(s). Last edit at 04/02/2018 03:16AM by o_lampe.
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Re: Two rods on one (Delrin-) ball-effector April 03, 2018 03:14AM |
I've bought the rubber rope from a shop specialized in boat-sailing equipment. This rope is UV resistant and made for heavy duty stuff. I expect it to live longer than the rest of the printer, but it's also cheap and easy to replace.Quote
What happens if the rubber wears out?
I also made an adapter for the Duet3D Smart Effector. I want to test the nozzle contact probe behaviour. Maybe even use extreme parameters to see, when the rods will loose contact. First I have to modify the carriers to work with rubber rope, so stay tuned for more video. ( It looks pretty dramatic, when a rod slips off
)
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Re: Two rods on one (Delrin-) ball-effector April 03, 2018 03:19AM |
Quote
Billhc83
I will be interested in seeing how the accuracy is in printing. Looks very smooth movement in the video.
Me too
I expected to see the rods dance around on the balls, but they are so smooth and have a very low friction coefficient ( almost like PTFE )
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Re: Two rods on one (Delrin-) ball-effector April 04, 2018 01:52AM |
The Smart-Effector adapter is just a quick and dirty design to test nozzle contact probing. I had to put it on long legs to clear the connectors ontop of the PCB.
I already had a former version installed and it worked well. (Deviation ~ 0.01 - 0.008)
But I didn't like the twisted mounts for the ballstuds.
Edited 1 time(s). Last edit at 04/04/2018 02:36AM by o_lampe.
I already had a former version installed and it worked well. (Deviation ~ 0.01 - 0.008)
But I didn't like the twisted mounts for the ballstuds.
Edited 1 time(s). Last edit at 04/04/2018 02:36AM by o_lampe.
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Re: Two rods on one (Delrin-) ball-effector April 21, 2018 06:11AM |
I made a new adapter which holds the hotend below the alu-effector. Now the Bowden tube has no lever to twist the effector off the rods.
I'm loosing ~30mm of print height, but at least it works.
I think of adding a small magnet in the top rod-sleeves, to keep the rod in place when they accidently slip off the Delrin ball.
I'm loosing ~30mm of print height, but at least it works.
I think of adding a small magnet in the top rod-sleeves, to keep the rod in place when they accidently slip off the Delrin ball.
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Re: Two rods on one (Delrin-) ball-effector April 22, 2018 02:21AM |
A flying ( or in my case dangling ) extruder will definitely help to decrease the forces of the Bowden tube, while the cable of any remote drive might be too stiff.
Anyway, I won't spend money on a remote drive unit, just to find out. But donations for testing are always welcome
Anyway, I won't spend money on a remote drive unit, just to find out. But donations for testing are always welcome
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Re: Two rods on one (Delrin-) ball-effector April 28, 2018 04:01AM |
I made the rod sleeves from ABS and used Acetone to smooth the surface, while pressing it on a Delrin ball. Delrin is acetone imune.
The top end rod sleeves are running on Haydns steel ball studs. I've built and described a smoothing method here.
But I later used a 90° hand deburr tool to match the length of the rods.
Edited 1 time(s). Last edit at 04/28/2018 04:07AM by o_lampe.
The top end rod sleeves are running on Haydns steel ball studs. I've built and described a smoothing method here.
But I later used a 90° hand deburr tool to match the length of the rods.
Edited 1 time(s). Last edit at 04/28/2018 04:07AM by o_lampe.
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