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Re: Tripteron patent deadline - 3 Jahre zuvor

Yes Apsu was one of those mentioned to build a Tripteron and stopping because of the patent issue. But I think patent is only one aspect. The other is that building the tripteron is challenging in respect to precision. Making good joints seem to be the main task, so when patent expired and anybody who wants to build one can start talking about freely, the community (we) can gather ideas how to a

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: Tripteron patent deadline - 3 Jahre zuvor

Thanks again for explaining. It's good to know that you have good knowledge of the matter. So it expires somewhen in 2022, and this should be sufficient to start or proceed. There is already running firmware, I'm aware of RepRapFirmware and Smoothieware, so one can experiment already.

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: Tripteron patent deadline - 3 Jahre zuvor

Thank you very much for explaining some details of patents! When PCT filing is April 10th 2002 and according to the note at the upper left "Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 155 days. ", then adding 155 days (and 20 years) are exactly Sep 12th 2022. So this seems to be the way google calculated it. Whether the calculatio

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: Tripteron patent deadline - 3 Jahre zuvor

According to it has an adjusted expiration of 2022-09-12. I am not a patent expert, but in my understanding the usage of patents is different in different countries. In germany where I live it seems to be possible to use it for noncommercial private use, but not in the US, where even private usage is prohibited.

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: How reliable are eccentric nuts? - 4 Jahre zuvor

You can secure the nuts by by a screw locking, I use Loctite 243. This is medium firm. Very firm is not recommended, because it would destroy the parts if you need to loose the parts.

von JoergS5 - General

Re: Patents - 4 Jahre zuvor

I perceive patents as a Gordian knot that one has to cut. My patent idea would be that an inventor receives a worldwide compensation based on the use, for example how many people benefit from the invention. That would be a meaningful task for the UN. The current patent system slows down inventions. We have x billion people who could invent things based on each other. They are slowed down by tod

von JoergS5 - General

Re: FiveAxisRobotic Kinematics for ReprapFirmware 3 - 4 Jahre zuvor

Thank you for the link, I'll check the kinematics. However I'll stay with my current approach to develop it myself. The basis kinematics and inverse kinematics is ready and checked in already. I started building the prototype now.

von JoergS5 - Polar Machines, SCARA, Robot Arms

FiveAxisRobotic Kinematics for ReprapFirmware 3 - 4 Jahre zuvor

I am currently developing the kinematics for a 5 axis robot for ReprapFirmware 3 (Duet 2, Duet 3, maybe Duet Maestro, possibly for LPC1768/1769 port). The reason why I am unsure whether Maestro and LPC are working, is that the kinematics uses trigonometric functions a lot, so a MCU with floiting point is advantageous for enough performance. Documenation of the parameters, axis and arm explanatio

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: A 3d-model worth the challenge of FDM printers - 4 Jahre zuvor

Instead of printing the keyboard, you can also consider printing the mold of the keyboard with a FDM 3D printer and use a production method like injection molding. You ask for improvements since 2015. I think some points are - many new filament materials, like compound ones - from 8 to 32 bit processors, so complex kinematics like Delta are better supported. This means better curve printing e.g.

von JoergS5 - General

Re: A 3d-model worth the challenge of FDM printers - 4 Jahre zuvor

If you turn your keyboard 90° and print all caps as individual parts, they will be printed perfectly. I don't understand what you want to be made better. Can you please explain more details?

von JoergS5 - General

Re: SaturnV - 4 Jahre zuvor

Your rockets are really impressive. Do you plan to join the Mars race? I didn't know that 2.5 mm nozzles exist, how far is the speed from injection molding?

von JoergS5 - Look what I made!

Re: Report on under bed sensor problems - 4 Jahre zuvor

Dear Mike, I found your analysis very intesting. I did not understand every detail yet and will have to reread. But I have some ideas already, which I want to share with you: Besides mass lever effect, I see other effects also, where I don't know how it contributes to the result: - the natural frequency (eigenfrequency) of the aluminium plate could play a role, especially the transient response

von JoergS5 - Tech-Talk

Re: Intermittant diagonal layer shift, how to diagnose? - 4 Jahre zuvor

The reason why I ask for M122 and hiccups so many times is the thread But you have a very differect firmware version and no hiccups, so it seems not to be a similar reason. He had write errors at the drivers also, however. My biggest bet would be on the supply voltage min 0.0 volt, but I'm not sure why (and when) this happened. But there is no undervoltage event, so this maybe a value while st

von JoergS5 - CoreXY Machines

Re: Intermittant diagonal layer shift, how to diagnose? - 4 Jahre zuvor

Maybe the problem is that the movement get stuck somewhere. Example see attachment. If possible, I would capture a video and analyze in at the time where the layer shift occurs. Did you make the marker test with pulley-to-shaft? Because if something stucks, the big jerk could slip the pulley and changes firmware's position information. I would take M122 after the layer shift occured, and you can

von JoergS5 - CoreXY Machines

Re: Intermittant diagonal layer shift, how to diagnose? - 4 Jahre zuvor

The config.g looks ok IMHO. The motor currents are a bit low, but should be ok. An M122 when the problem appears again would be the next I recommend.

von JoergS5 - CoreXY Machines

Re: Intermittant diagonal layer shift, how to diagnose? - 4 Jahre zuvor

To exclude the possible reason of a slippery pulley on the stepper motor, you could take a marker and make a mark accross pulley and motor shaft, Then you would see immediately if the pulley slips when the layer error occurs. It is an unlikely reason, but the check is easy and inexpensive, so to be sure... E.g. like image attached. And there may also be a configuration problem (e.g. microsteppi

von JoergS5 - CoreXY Machines

Re: Triple Z Axis - 4 Jahre zuvor

I expect 4 mm for a 400x400 too thin, I would take 8 or more mm thickness. As material so-called MIC6 aluminium (= cast aluminium plate) is a good choice.

von JoergS5 - Mechanics

Re: Triple Z Axis - 4 Jahre zuvor

In most cases it is recommended to use two linear guides and a three point bed. The best explanation about the bed I know is: and you can find valuable other construction ideas from him in his other blogs also which I recommend much. The reason why only two linear guides is: the construction is sufficient for a multiple kg load and more than two guides mean that they must be calibrated very pre

von JoergS5 - Mechanics

Re: The Spice Must Flow with servomotors - 4 Jahre zuvor

You could try something like this if you like to.

von JoergS5 - CoreXY Machines

Re: RepPanel - A display alternative for the PanelDue - 4 Jahre zuvor

That's a nice solution and I will look into your code to learn! Personally I would add an emergency print stop button somewhere additionaly (but protected not to be acivated unintentionally...)

von JoergS5 - Duet

Re: A dual drive geared extruder project - 5 Jahre zuvor

Nice idea and thinking about how to speed up extrusion. I would be interested what the maximum mm³/s is with Volcano or even SuperVolcano.

von JoergS5 - Mechanics

Re: Steel sheet metal frame? - 5 Jahre zuvor

Quotewitor As far as I can see aluminium extrusions are used in most corexy frames. Would it be a good idea to use laser or plasma cut 2-3 mm steel sheets to build the frame? Laser cut pieces should be perfectly square so the frame would be perfectly square and the frame made of 3 mm steel would be rock solid. Sheets could be screwed together or maybe even welded. I do realise that a frame of 50x

von JoergS5 - CoreXY Machines

Re: Steel sheet metal frame? - 5 Jahre zuvor

QuoteVDX ... one of my earlier ideas was a sort of "geodetic dome" or a similar structure built from stiff carbon rods and thin steel wires - this can give any internal geometry, is pretty lightweight ... and could be designed "foldable" for mobile use A Tensegrity would be something to look for. Greetings from Buckminster Fuller for both ideas... I plan trying to build the Scara arms with thi

von JoergS5 - CoreXY Machines

Re: ... sourcing parts for a parallel SCARA - 5 Jahre zuvor

Then you can use the RRF2 version and in January I'll migrate to RRF3 and make a push to the official RRF. I have a Duet 2 and 3 and will test with both. The skewing has the disadvantate that it tilts only into specific directions. I am not sure whether it's worth using or better implement separate axes at the hotend/tool point. The skewing angle changes with position, which makes kinematic more

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: ... sourcing parts for a parallel SCARA - 5 Jahre zuvor

RRF 3 is possible for Duet 2 Ethernet. I have created a RRF 2 version already for parallel Scara which is tested by user bondus, but without your idea of screwing. Please tell me when you are sure whether want to implement it. I don't want to waste time if you don't use it. But I will implement it if you want to use it. The current documentation is in and the current RRF 2 firmware is in

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: ... sourcing parts for a parallel SCARA - 5 Jahre zuvor

Skewing is a nice idea to support milling cutters in CNC eg. If you build one and use Duet RRF version 3, I can help with software (I mean the necessary RRF3 firmware).

von JoergS5 - Polar Machines, SCARA, Robot Arms

Re: Singularity-Free Kinematically Redundant Planar Parallel Mechanism - 5 Jahre zuvor

Interesting, thank you for the images. Your flexures are good for robotic grippers, I guess. For 3D printers I thought about hinges with big possible degrees like in [3dprint.com] and large stroke flexure hinge: or butterfly hinge: The calculation of the kinematics could be implemented in firmware.

von JoergS5 - General

Re: Singularity-Free Kinematically Redundant Planar Parallel Mechanism - 5 Jahre zuvor

Books and videos from Larry L. Howell about compliant mechanisms are interesting, especially for MEMS. I thought about using them for backlash free hinges in 3D printers. Hylite is an alternative (also a flex structure). With today's processing power one can calculate and optimize better than in the 1920s, and there are a lot of new materials.

von JoergS5 - General

Re: Singularity-Free Kinematically Redundant Planar Parallel Mechanism - 5 Jahre zuvor

QuoteVDX ... remembers me on this old thread (see the attached images) Interesting thread. The dissertation of Jungnickel is interesting about serial and parralel kinematics and about somehting which is called today Compliant Machanisms. I didn't know it is known for so long back to 2004.

von JoergS5 - General

Re: The J-Head 12 HiFlow Has Been Released! - 5 Jahre zuvor

QuoteMKSA ... Anyway, because of that, I made my own, all metal too,using a horizontal heatsink, 1cm thick 5cmX2.5cm is enough, from hobbed gear to cold/hot transition zone, 22mm. Do you mind publishing an image of your DIY hotend, I'm interested in milling my own also. How much effort was it, did you use a CNC machine?

von JoergS5 - For Sale