- Видео 44
- Просмотров 26 590
Mark Rehorst
Добавлен 31 авг 2011
Soundcraftsmen PM860 Demo
Recapped Soundcraftsmen PM860 power amplifier from the mid 80s.
Works and sounds like new!
Works and sounds like new!
Просмотров: 250
Видео
Fun for Cats!
Просмотров 5856 месяцев назад
I wrote a spreadsheet that generates random ball movement on the Arrakis 2.0 sand table. Ms. Kitty seems to like the way the ball moves! The spreadsheet uses the size of the table, the allowable speed range, and the allowable dwell range, to create about 500 lines of gcode. I save that gcode to a file and upload it to the sand table. I typically run it with the dwell time between 1 and 3 second...
221024_01 on Arrakis 2.0
Просмотров 290Год назад
Arrakis 2.0 has a new glass bottom sand box with white lining, more colorful lighting, and new UHMW PE sliding bearings. More here: drmrehorst.blogspot.com/2022/11/arrakis-20.html
Another test of the variable speed post processor
Просмотров 1422 года назад
This video shows the result of the latest and final(?) version of the variable speed post processor for Sandify pattern files. The user enters the pattern file name, maximum and minimum speeds, and the segment length at which the minimum speed applies. Both speed values entered are used as thresholds- calculated speeds lower than the minimum or higher than the maximum are set to those values, a...
Testing new post processor for Sandify pattern files
Просмотров 1252 года назад
I wrote a new post processor that applies speed proportional to the length of the segment being drawn. This video is one of a few I shot that shows how it works, except that Ms Kitty decided she wanted to be the star instead of that stupid little ball. This version of the program applied a proportional speed value calculated based on a user input for maximum speed and the diagonal measure of th...
220620_01
Просмотров 1002 года назад
300 mm/sec drawing speed, 1000 mm/sec edge speed ; Created by Sandify ; sandify.org ; Version: 0.2.6 ; ; Machine type: Rectangular ; Min X (mm): 0 ; Max X (mm): 590 ; Min Y (mm): 0 ; Max Y (mm): 980 ; Content type: shape ; Layer: ; Shape: Fractal Line Writer ; Name: polygon ; Type: Gosper (flowsnake) ; Iterations: 5 ; Visible: true ; Initial width: 191 ; Initial height: 191 ; X offset: 58 ; Y o...
Drawing at 200 mm/sec
Просмотров 1482 года назад
Arrakis drawing a new pattern at 200 mm/sec. ; Created by Sandify ; sandify.org ; Version: 0.2.6 ; ; Machine type: Rectangular ; Min X (mm): 0 ; Max X (mm): 590 ; Min Y (mm): 0 ; Max Y (mm): 980 ; Content type: shape ; Layer: ; Shape: Fractal Spirograph ; Name: polygon ; Velocity: 7 ; Resolution: 2 ; Number of circles: 3 ; Relative size (parent to child circle): 4 ; Alternate rotation direction...
Another servomotor test print, 300 steps/mm
Просмотров 1272 года назад
UMMD corexy printer, 50 mm/sec, accel 5,000 mm/sec^2, 0.2 mm layer thickness, 1 mm line width, servomotors set to 4000 steps/rev, 3:1 reduction, which equates to 300 steps/mm in my printer. At this resolution the maximum print speed will be 400 mm/sec (assuming max. 120k pps from the Duet 2 controller board) If you really work at it you can see a faint artifact in the surface of the print. This...
75 steps/mm servomotor test print
Просмотров 1282 года назад
This print was made with the motors switched to 1000 steps/rev (they have 1000 line encoders) yielding 75 steps/mm in my printer. It has the same artifacts as the 480 step/mm print and they are about the same in magnitude.
480 steps/mm servomotor test print
Просмотров 1212 года назад
The servomotors are iHSV42-40-07-24. I switched the motors to 6400 steps per rev which yields a theoretical resolution of 480 steps/mm in my printer. You can see artifacts in the surface of a test print that repeat at 90 degree intervals around the cylinder. To me it looks like the resolution is nowhere near 480 steps/mm.
Servomotor protection circuit test
Просмотров 3,5 тыс.2 года назад
Motors running at high speeds can generate voltages in excess of the power supply voltage. Also, sudden decreases in motor speed can generate voltage spikes when the motor's kinetic energy is converted to electrical energy. Those voltage spikes can destroy the power supply and any other electronics connected to it. This video shows a test of a protection circuit that was taken from an app note ...
Ultimate 3D printed wire twister
Просмотров 8662 года назад
A little PETG and a couple Wago 221-412 lever nuts makes for a tool-free wire twister. The Wagos are rated for 24-12 gauge wire. Just cut two pieces of wire to equal length, strip the ends, insert one end of each wire into the fixed clamp Wago and snap the levers down. Insert the other end of each wire into the spinning clamp Wago and snap the levers down. Mount the spinning clamp in your drill...
Arrakis Drawing a 2.2 Sided Polygon
Просмотров 952 года назад
A Sandify pattern that starts with a 2.2 sided polygon with rounded corners. Apply a scaling, some spin, and a track and this is what you get. Drawing at 200 mm/sec, edge speed at 1000 mm/sec, acceleration at 20k mm/sec^2.
A complete pattern running on Arrakis
Просмотров 2622 года назад
A complete pattern running on Arrakis
Ms. Kitty finds a new way to enjoy Arrakis
Просмотров 1133 года назад
Ms. Kitty finds a new way to enjoy Arrakis
Arrakis drawing in glass beads under red/blue LED lighting.
Просмотров 1713 года назад
Arrakis drawing in glass beads under red/blue LED lighting.
Arrakis experiment- glass beads, drawing with the flash turned on
Просмотров 873 года назад
Arrakis experiment- glass beads, drawing with the flash turned on
Arrakis experiment- glass beads, drawing at 100 mm/sec.
Просмотров 1263 года назад
Arrakis experiment- glass beads, drawing at 100 mm/sec.
Arrakis experiment- glass beads, erase at 200 mm/sec
Просмотров 1293 года назад
Arrakis experiment- glass beads, erase at 200 mm/sec
Dual Speed Pattern File Running on Arrakis
Просмотров 3923 года назад
Dual Speed Pattern File Running on Arrakis
Video Sounds Terrible
200 wpc in a shoe box 💣
I recapped it, so it's ready to provide another 40 years of awesome music. You can buy it on ebay! Do a search for "Soundcraftsmen PM860"
You put glass on top of it... cheating!!!
Much better than a laserpointer! 😻
Cool!!!
Can you share your contact details please?
Hello, Thank you for this project! My CNC project is built around JMC motors so this is really usefull I am about to build this board for quite a few motors, do you have any recomendations before I start ? Only one component from your BOM is out of stock and I found this TIP147FTU-ND instead, will it be okay ? WHat should I update if I drive my motors at 48V and their rating is 400W instead of your 78W example? Thanks!!!
Amazing watching this run...especially the hi-speed along the edges !! Awesome job !
Thanks for your previous Answer - I am really considering printing the board you have designed. Am I right to believe that the board is: 2 Layers; Copper Weight is 1oz.. what I am trying to understand is what are the requirements of the board that you sent to the PCB Manufacture in terms of Layers, Copper Weight, Board Thickness etc?... just want to print exactly what you have - as you have tested your version of the PCB thoroughly.
Yes, 2 layers, one oz copper. See the blog post for a link to the files for the board design: drmrehorst.blogspot.com/2022/05/bank-account-protection-circuit-for.html
I have a question about the Protection Circuit (Returned Energy Dump). if you have 3 Brushless Motors connected to 3 ESC's do you need 3 Protection Circuit (Returned Energy Dump)? Would I have to connect each motor to this circuit in order to protect the power supply ESC's and the motor itself? 1 Protection Circuit (Returned Energy Dump) for each motor?
The ReDump board is good for a maximum of about 10A. It will not protect the ESC(s), but it will protect the power supply and anything else connected to the power supply from overvoltage generated by the motor(s). If you are using small motors, you might get away with one ReDump, but BLDCs tend to be very high current motors, so you'll probably need one per motor/ESC.
@@MarkRehorst Thank you for your response - the motors I am using is A2212/10T 1400KV. I believe if I stick to a max of 10A then this will give the require protection and I agree I think it is best to do one per motor - especially given the fact that a requirement is that my motors need to change from clockwise to anti clockwise quickly.
Is this Maschine CoreXY? If yes, itz bullshit
Yes, it's corexy. Why would that make it bullshit?
@@MarkRehorst I have a Tronxy 3d Printer and IT cant Print circle 😜🤪 and the system dosent make sense to me... 2motors Fight with each other, need more Power.. overheat etc.
@@DocOfDead As you can see from the videos, Arrakis works well and has been very reliable. There are many corexy 3d printers out in the world that work fine, including mine. The motors don't "fight" each other. They work in tandem. Maybe you need to tune up your printer a bit, especially motor current. If the motors are hot, turn down the current.
@@MarkRehorst UFC Fight core ist a better Name for this Bullshit.. sorry.. but yours Look good 🧐
Voron 4 Motors Just for leveling 💪😆 how fast do you Print in Z Axis??? 💩🥵
Nice! I love a good clean wiring job.
Excellent use of the wago connectors
Thanks! I have a few more designs for different types of mounts for them, too, at the blog.
Amazing! What stepper/drivers are you using to get these speeds?
Not steppers, servomotors with integrated drivers. I send them step/dir/enable from the controller board. If I used larger drive pulleys the mechanism could run much faster.
Have you tried drawing fractal-like patterns?
Sandify can generate a few fractal patterns but I think they are all L system type. There's no provision for things like Julia sets or Mandelbrot sets.
Cool stuff Mark, thanks.
Such a clean build. Very impressive.
Been following for a few years...amazing work, makes me jealous !!
Don't be jealous, start on a project! It doesn't matter what it is, just follow it down the rabbit hole
Amazed at the edge speed !!!
The edge speed is 1000 mm/sec. It can easily go faster, but it starts to get a little noisy if I push it any faster. The table is capable of such speed because it uses servomotors instead of stepper motors.
Love it! I have to build a table myself now
Check my blog on it at drmrehorst.blogspot.com/2021/10/arrakis-this-is-part-of-weirding-way.html?m=1
@@MarkRehorst have been reading the many pages. Thanks very much for all the details!
Brilliant application of this motion system, and very fun to watch. I think if you tagged this "ASMR", you'd get about 10,000x the views...
Thanks, I'll add ASMR to the tags!
Amazing edge speed... Great job !
you are using servo motors and not steppers ?
Yes, not steppers. I started with steppers and couldn't get them to go fast enough, and the faster they went, the noisier they were. The servo motors are much faster and quieter.
@@MarkRehorst I see, very good, Keep up the good work Mark.
@@MarkRehorst How do you define "fast enough"? 200mm/s seems waaaay overkill for a sand table
@@Synthetica9 look at the videos and tell me if 200mm/sec is really fast enough, especially on a pattern that has a lot of edge motion.
@@MarkRehorst I suppose it depends on what you're after. If you want to quickly lay down a pattern, maybe 200 isn't enough, but if you just want something that gradually changes over time it's more than enough. I am currently planning out a build, and I don't intend to run it faster than 50mm/s
Do you sell these?
No, but I might if your pockets are deep enough!
I wrote a blog post on the build with a link to the CAD file that has all the details you would need to build something like it. See: drmrehorst.blogspot.com/2021/10/arrakis-this-is-part-of-weirding-way.html
Epic
Bravo! Just awesome. Have you tried trying to display an overhead topographical map of some sort?
Nope. That's not what this does.
what firmware? and what stepper drivers are those . crazy acceleration i must say!
Arrakis uses Reprap firmware running on a Duet 2 WiFi 3D printer controller board. The motors are IHSV integrated servomotors with their own drivers that take step/direction/enable signals from the controller. I first used these motors in Arrakis' predecessor, The Spice Must Flow and there are blog posts on both machines here: drmrehorst.blogspot.com/2020/04/the-spice-must-flow-gets-servo-motors.html and here: drmrehorst.blogspot.com/2021/10/arrakis-this-is-part-of-weirding-way.html The motors are capable of much greater speed and acceleration than I am using. Right now the speed is limited to about 1600 mm/sec and acceleration to 2g by the 20 tooth drive pulleys I used, but larger pulleys would enable much higher speeds and accelerations. Of course, if you go much faster, the machine will throw not only the sand but also the ball.
Mark, this is SUCH an amazing sand table! Like Ms. Kitty, I am memorised by it. I'm currently up to my eyes in building my own much slower sand table - the original ZenXY and am loving all the learning. Have you ever considered doing a tutorial for how to build the Arrakis?? I would LOVE to build one one day!!
Thanks! I'm working on a blog post about it, but there won't be a step by step or BOM. One of the other videos shows the mechanism pretty clearly, and I'll post a link to a CAD file. Anyone who can build a sand table should be able to fill in details. The key to high speed is to use servo motors, not steppers. A good controller helps too. I used a Duet wifi controller so I don't have to have a control panel on the table and all the electronics can be hidden. The servo motors need bigger power supplies than steppers.
Blog post is up. See: drmrehorst.blogspot.com/2021/10/arrakis-this-is-part-of-weirding-way.html
Would you ever consider streaming whole patterns? I wanted this to continue longer X-D
I'll try to shoot a video tonight and get it posted tomorrow.
Welcome to Hackaday! #first
Would perhaps a smaller diameter ball present any problems in your setup - beyond the obvious longer drawing time?
No problem at all, I'd just have to use less sand. This table can draw patterns up to almost 2000 mm/sec, so drawing time is never an issue.
Hey folks, what do you think? I've noticed that a LOT of youtube videos these days have thumbnails featuring someone making a goofy face. Is that what I need to do to get subscribers or views on my channel? Do I need to grow a neck beard and tie my hair in a man-bun? Do you respond to that sort of thing?
Arrakis will be running at the Milwaukee MakerFaire from September 24-26th, 2021 (in about 3 weeks). Come see it in person. I'd like to meet you and answer questions...
Man, with a CAD file, bom, wiring diagram and firmware config I sure would be tempted to build one of these! :)
Why do you need all that? There's plenty of info in the videos to get you started! I'll be posting a blog on this table in a few days and I'll post a link here. There won't be a BOM- you're going to have to figure that out for yourself. I'll be happy to answer specific questions...
The configuration is super easy- there's no heater, fan, extruder, or Z axis, so all you do is set up the endstops, travel limits, and motor directions. I think there's more to setting up the wifi than there is to setting up the rest of the mechanism.
@@MarkRehorst Will look out for the blog post. There are a few ... popular open source hobby engineering projects right now that provide CAD, BOM, firmware, etc., is where I got the idea, naturally. One such project is sitting on my desk right now, Voron-ing away at some redundant, useless tchotchkes probably. Your sand table (potentially pitched to my wife as a "new interesting coffee table") might actually stand a chance of making it into our tv area.
@@samtny1 Successfully designing and building a complex project yourself is mostly a matter of taking it one step at a time, always working toward the final goal. Take some hardware you have or know where to get, some stuff you know and some stuff you have to learn, and put it together. When you get stuck, and you will, think of one small thing you can do to move forward and do it. Then do that again and again, and pretty soon, the whole thing is done. This project is a lot like building a 3D printer. The controller is a Duet 3D printer controller (many other can be made to work, too) that comes loaded with firmware. Power supplies and LED strips are off-the-shelf and available at many places. Patterns are generated using Sandify (do a search). There's no programming required to get it all working, unless you want to. It's a lot more fun and educational to design and build it yourself, and you end up with exactly what you want. You know how it works and how to fix it if it breaks, and what sort of modifications you can make later.
@@samtny1 Blog post with CAD file link is here: drmrehorst.blogspot.com/2021/10/arrakis-this-is-part-of-weirding-way.html
Dang, those servo's are silent. At that speed, steppers would make a lot more noise. Fantastic table!
Yeah, the motors are super quiet. Most of the noise comes from the X axis sliding along the Y axis rails and the gear teeth hitting the belt teeth on the motor pulleys. There's a sheet of EPDM rubber glued to the bottom of the table so the ball rolling in the sand is quiet.
The red and blue fur is a…bold…choice, but the low noise really is something
The fur matches the LED lighting inside the table.
amazing
ultra mega max dominator finally on youtube :^)
Really nice design, much nicer than the CNC based table I just build ! Can I ask you what kind of insert do you use to make the head rail slide on the side please ?
Thanks! Both axes use PTFE bearings. For the Y axis, the whole X axis slides on two PTFE blocks, one of which is spring loaded, that fit the 10 mm slot in the t-slot frame. The magnet carriage which moves in X, has 4 small rectangular PTFE blocks that contact the square aluminum tube that is the X axis guide. Even though PTFE is used, the mechanism has pretty high friction. The servomotors have more than enough torque to keep it all moving, even at high speeds and accelerations. The mechanism is very quiet.
@@MarkRehorst Nice idea for the ptfe, I was looking into linear rails as an alternative solution ;)
Mark, any plans of selling this?
No plans right now, but things may change...
Looks like the RUclips algorithm has brought me to another great video
Check the new Arrakis sand table mechanism in some of my other videos. More to come as I finish the sand box for it...
Why did you go for cross belts than simple stacked corexy
The motors mount on the frame rails that serve as the Y axis guide rails. That meant that I had to put the corner pulleys on separate axles in order to keep some of the belt segments parallel to the Y axis rails. I could have stacked the pulleys on the corner pulley blocks, but that would probably have reduced the drawable width of the table (the X axis) and would have complicated the Y axis bearing/pulley block design. My 3D printer has the pulleys stacked on both the Y axis bearing/pulley blocks and the corner pulley blocks. I was able to do that because the motors don't mount on the frame rails and I didn't use the frame rails for guidance.
@@MarkRehorst yes the UMMX, the best build I have ever seen. Btw, dont you think that this setup can be de purpose for a 3d printer (bieden style) ? As in the 3d printer need not face forces like CNC router so a light weight hot end may do the job??
@@PS-nf3xw In the sand table the bearings are all pretty loose so precision and accuracy would probably be unacceptably low for 3D printing. Sand is a low resolution medium so poor precision and accuracy are acceptable in the sand table. Then there's the motors. I tried using the servomotors from the sand table in my 3D printer, UMMD, and found accuracy problems. It may be that I need to adjust some of the motor driver parameters, but I haven't been able to find any good information on doing that.
I am assuming the belts are setup in this orientation ? ruclips.net/video/IkM2K7CsiHo/видео.html
No, that's H-bot. I used a corexy mechanism. See: corexy.org/
Can I get a built ready??
How deep are your pockets?
Crap .
Really robust looking design! Any plans for open source?
I am in the process of building the sandbox now. As soon as that is done there will be more videos and a blog post with details including a link to the master CAD file.
Hi, i am going to try and make one of these and i just wanted to know, what do you use to run the patterns, and what software do you need to make this all work?
It uses a Duet 2 wifi 3d printer controller board. Pattern files are simple gcode generated by Sandify. The mechanism is a corexy type, similar to that used in 3d printers. You can find more details on my blog. Search for "blogspot rehorst".
Where the blog ? And looking good :)
Do a search for "blogspot rehorst"...
here: drmrehorst.blogspot.com/
The digital dentist strikes back
Looking good!
Thanks Pete!