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General discussions. For specific printers / electronics / fabrication methods / softwares, please see other sections.
Re: Kinematic systems and linear guides - 6 years ago
Quotethe_digital_dentist There's small and there's small. I think a lot of people try to use too small hardware in a misguided attempt to minimize moving mass and end up with a wobbly mechanism. In my printer's X axis the guide rail is 24 mm wide. I set it on a granite surface and found it was flat, so didn't see any need to bolt it to anything else. The two bearing races are 24 mm apart, so theyby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
QuoteVDX ... better than a "normal" SCARA is a "parallel SCARA"! - much better accuracy/precision across the complete working range and some funny options too, if optimizing the kinematics (and dynamics) ... and a totally different "parallel" 6DOF-kinematic - Here I've started a thread about my own P-SCARA assembly ... it's not this fast (have a bunch of other projects running in pby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
Quoteleadinglights Quotepandaym ........... Do you have any video of that two axis bed slinger? Would like to see such a machine working. ................................ The XY mechanism being used for some light milling in The reason why I didn't want to move the hotend mechanism in At the moment it is stripped down to replace the printed gears shown in the second video as they kept breaby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
Quotedekutree64 QuotepandaymI also absolutely agree on the cantilevered Ultimaker bed - this part of their design they can keep to themselves. On my corexy I have 3 Z motors with lead screws on flexible couplers. This along with 2 linear rails feels like a solid Z setup, that I will probably bring over to my next printer. Generally I am a fan of constructions that have the correct number of consby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
Quoteleadinglights Hi Pandaym, Having 3 axes working independently does intuitively seem the way to go. For myself I would rather build my next 3D printer from cast iron; filed, hand-scraped, and, if necessary, chewed into perfect flatness and squareness. The numbers however tell a different story: Many Delta printers made by happy amateurs achieve accuracy throughout the build volume not too farby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
Quotethe_digital_dentist I have used linear guides in a bed flinger and a corexy machine. I would not build using any other type of guidance. Any time you use any sort of end supported guidance, either round rails or wheels in T or V-slot you have to worry about aligning the rails to each other in 3 dimensions. T and V slot rails are extruded, not milled and ground, so you never really know howby pandaym - General
Re: Kinematic systems and linear guides - 6 years ago
Quotedekutree64 I do like the look of that crossed rail XY system. The moving bed is good for milling where you need high rigidity and movement is slow enough that momentum is negligible, but it amazes me 3D printers can yank it back and forth as well as they do when printing narrow zigzags. Also not good for tall skinny things. What I don't like about the Ultimaker design is the cantilevered beby pandaym - General
Kinematic systems and linear guides - 6 years ago
Hi everyone, After having dealt with different types of 3D printers, I am slowly preparing to design my own printer. I am a mechanical engineer, and therefore probably overthinking it a lot, but currently I am putting a lot of thought into the XYZ kinematics, and would like to hear your thoughts on the common concepts and potential alternatives. I would like to share some of my views on kinematby pandaym - General