RepRap LISA Simpson - First Moves
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- Опубликовано: 14 окт 2024
- This machine was designed by me and students in my robotics class assembled it.
The inverse kinematics are in place. The precision is great. One screw wobbles but that can be fixed. I also forgot to turn the current down on the steppers so they melted the couplers so there is a bit of slop in the machine by the time I videoed this. That too can be fixed. I only needed 1 calibration point to get a level print.
Development Forum: forums.reprap.o...
Files: github.com/Nic...
Build Forum: forum.conceptfo...
I really love how you can turn a couple of turning rods into such complex movements with a bunch of levers and gears.
Watching this thing is almost hypnotic.
I like that you left the bare PVC, since it shows what it is made of, but some textured black spray paint would make that look amazing. I'm impressed, as usual by your creations.
Music adds a dimension that is killer! Nice.
We are going to build a Lisa Simpson and I can't wait to post videos!
Awesome!
Read forums.reprap.org/read.php?178,295454,295454#msg-295454 and forums.reprap.org/read.php?178,267835 and forum.conceptforge.org/viewforum.php?f=10 before you get started. I would be glad to help however I can.
Beautiful! But poor Wally, relegated to being a mere spool holder for the new kid ;)
Love it!
very good design!
Now THAT is slick!
Wow, good work. The offset connections to the hub limit ROM a little.
Not so! It is designed to never affect the range of movement.
Nicholas Seward Excellent! (as always!)
Love this printer. It looks so much more stable, sexy and easier to design than all the older mendal variants. Lets hope delta's become the defacto standard as they seem to fix a hell of a lot of the issue we all face with the standard printers (i.e stability, axis wobble, belt issues, x-axis weight issues, maintenance, etc).
Any idea when more details will be made public?
I put some links in the description. The files are all public and open source.
Nicholas Seward Oops. Sorry didn't see the links first time around, the show more button was missing!
Rick Mills I just added them. No worries. :-)
Very Nice!
it seems there would be a problem with position when the nuts rotate unintentionally because of the movements of the other two arms. Is this corrected for in the firmware? I know its an old video, but the concept is still valid (and really amazing in my opinion)
It just makes the firmware nastier. The rotates are intentional and repeatable so no problem.
:) that's awesome!
Hi, I was wondering what software you use to model your printers?
How's the speed of the acme lead screws versus belts? Or more to the point, what kind of mm/s speed are you getting?
I expect to get about 75% of the standard Rostock speeds. Bottom-line: more than enough speed. No one prints at full bore.
Nicholas Seward So true, but lord knows we try! ;-)
i have a question , your arm configuration for lisa is very interesting , how much torque can provide the stepper motor ?
andrea maritan I am running 45oz-in steppers with a current rating of 1.2A. To keep the steppers running cool I actually run them at .8A which means I probably only have 30oz-in of actual torque. Actual measurement would have to be done to be certain.
Note: This is about standard for most all 3D printers. Not just LISA. Also, in tests, I was able to drop the current down to less than .6A before the steppers started missing steps like crazy.
Thanks , i was asking because i'm triyng to understand if mine can work properly and now i know they're ok .
I am just wonderin, if only one motor goes down/up, other two will spin around threaded rod and move slightly up/down as well. Do you compensate this in SW?
firefoxik75 You are exactly right. It is a pretty substantial effect. The inverse kinematics for this is just a bit more complex than a Rostock style bot. BTW, she is printing. ruclips.net/video/T9ArP3Ies8k/видео.html
How much dollars it costs to build(all parts)? I'm looking for the cheapest model will be my first so I will learn a lot from it.. before go to more expensive ones. which is the best to start? Lisa or prusa or even delta 3dr?
I am at about $500. A Prusa is about the same cost and would be more appropriate for a first printer. Printing has lots of pitfalls and an unproven/poorly documented design such as LISA would add to the frustration. That and you need a printer to make LISA. Good luck.
Nicholas Seward Thanks =D, Success
Nicholas Seward I'm considering making a 3D printer and I've read all the recommendations for building a cartesian printer first but I was convinced that by making a delta I'd basically just save the money from 1 stepper and its driver. I'd be willing to go through a few more hassles as I'm kinda tight on money. But what's making this design cost as much as a Prusa? Could it be made cheaper? Thanks.
Francesco Mastellone LISA losses all of her cost savings because the lead screws are so expensive. If you want the cheapest best bot then you have to build it yourself out of junk. Barring that as an option due to ability and time restrictions the RepRap Morgan is probably the cheapest bot going. 3DPrintMi is also very cheap. Check them both out.
reprap.harleystudio.co.za/
gyroe3dprinter.blogspot.com/
BTW, you can get a stepper for less than $12 and you can connect two steppers to the same driver so saving a stepper doesn't save you much money.
What is your budget and what are your specifications? I would look at kits and I would price out buying the components yourself. If you are in the US, feel free to send me your shopping list and I can give you advice.
Thanks, I'm in Italy but I appreciate! :) I'll look into those two designs. On the LISA, why not use printed gears to move regular screws faster? Tolerances?
I can never figure out how to make a delta pull off a straight line.
And that is why 99.9% of all printers are cartesian. Way too many things to go out of whack with a delta.
which file has inverse kinematics in github? Thanks in advance.
What is that song?
Clappy by Rob Simonsen
RUclips has a bunch of songs they have the rights to use and this is one of them.