For those that are asking, the gear system is called a Howimat. There's not a lot of information on them, so if you find more info make a post about it in the comments!
Just wondering if you're still planning on making a video about the Howmit drive? I'm very interested in it as I'm currently working making a large 5 axis. I'm curious to know how stable your setup is being made from extrusion? I'm currently going back and forth between that and steel square tubing.
Love the work. The pile of "this part was replaced with something else" definitely took up more room than the finished project. Reminds me of my projects.
Die punch is great for large fan holes. Excellent project and documentation. A lot of insight can be gathered from this project. Looking forwarded to seeing what other ideas pop up here.
You cool! : D I'm very glad that you're back on RU-vid. : D Next step - switch to profiled rail and recirculating ball linear bearings instead of round shafts. For example - the original HIWIN. This manufacturer has proven itself well, but only the original and not a fake product.
Very impressive! I have built a few large format CNC machines operating on LinuxCNC over the past eight years but have to admit this mechanism next level stuff. Great to see such dedication to the machine building craft.
Nice vid man. FYI, You never want to twist wires together UNLESS they're a differential pair or power and ground. For instance, if you had a serial transmit and receive set, you'd want to keep those separate as twisting them together would cause cross talk, especially at higher frequencies (baud rates). A "pair" when talking about twisted pairs is usually a differential pair, for instance a CAN line would use a coupled or "twisted" pair when routing the circuit. This turns the prospective EMI into common mode noise that is then ignored during differential signal interpretation.
That's a cool gear mechanism! looks like a simplified Mini Galaxie from Wittenstein. The design trades a little bit of torque capacity and torsional rigidity for simplicity and compactness. Would be great to hear more about this drive and how you made it.
@@bogas78 I only found info on cycloidal ball reducer as most people comment around here, but the principle is by far not the same, here we get the balls reciprocating in a up down motion inside the disk, please help a friend out if you guys got more luck! Meanwhile waiting for the content owner to show up in the comment section. Much appreciated!
Hi Dylan! Thanks for this video! I'm glad you found a solution to the flex spline problem. I'm looking forward to the video about the gear reduction device you used. Happy New Year and I hope you enjoy Texas!
Looking forward to seeing your video no the cycloidal ball reducer. I had not been impressed with the other types. It is good to hear that your experience with them confirms my suspicions.
I want to see everything you have. I will not understand much of it (I don’t even know how to turn on a computer) ,but I’m trying some. Thank you for allowing me to learn at least a little from you.
If linuxCNC use pivot point for it's TCPC, the centers of ration need to be located perfectly to have perfect rotation. Same as on industrial machines : cut one one side, do a 180°, recut, measure the tickness and adjust accordingly the pivot center. the hard thing is that you need to compensate the rotation AXIS of 2 axis, switching back and forth as you compensate as they are sort of linked.
6 месяцев назад
Would you be willing to do a deep dive on your drive (halomat)? I havent found it online or to be used for industrial purposes. Also as you mentioned alot of people are finding out the hard way that harmonic drives or cyclodal drives arent good when they are 3d printed. Just to talk more about how they work and how to design them for the correct reduction ratio and so on.
The Backlash - belts stretch and contract. Maybe a little bit but they do. Thry to compensate it or remove the belts entirely with gears if possible. At least the gears have predictable backlash and it could be compensated with the software easily. Love the video great work keep on going
46:23 When you are trying to show a small piece in frame and want the video camera to focus the part, you must use the palm of your hand as a background or piece of paper, or else the video camera has hard time focusing. Excellent work on you 5 axis. I like the rigidity of the brackets...
When you're machining aluminum, and you can't use coolant, try and use an air vortex cooler. We used to do this when cutting open sealed boxes so we could harvest circuit boards out of them. Worked great for clearing chips from the endmill, and keeping temps down. It does require a beefy compressor/air supply though.
The backlash is coming from the slop in all 3 axis with the round rails in an improper load bearing application on 2 of them on the side of the bearing housing.
Great video! I work on CNC machines for a living and i learned a bunch from this. The controller i work with the most is Fagor. They have offsets that can be used to correct the TCP errors you were trying to describe in the video. I would expect there is an equivalent with your controller especially as some head designs require these to be used as they cannot be physically aligned. I can send you information on how the offsets are used on Fagor controls if you think it would be of any help.
since people have been asking. its called a planar ball reducer they are known and studied and there are reasons they are not used. ie Hertzian contact instead of line contact of cycloidal or harmonic. meaning they have lower stiffness. they are really just a differently shaped cycloidal drive. also called cycloidal ball transmission
Yeah pretty much. I’m not sure how zbl is achieved without the drive on the same axis. Stiffness could be improved using 3 wave peaks. But I can’t see mounting a motor without a worm or recirculating balls powering the drive platen that introduces backlash.
Holy cow that was a lot of tape and glue and facing work. I thought aluminum plate could be bought fairly precise and flat? Do you think the work facing it was needed?
The rails are crappie, mate. That's at least one of the big problems, in my opinion. Go with 100mm granite block and 50mm the rest and 35 to 50mm rails to stop the twisting.
Thanks for the heads-up on the gear reduction. I'm very interested in the design especially as used in 4th axis. I'm not sure if you are using a tool length touch off sensor? If you are not it should help your accuracy. It also reduces the tool change effort so you can throw in a chamfer bit. (much easier and better looking than hand finish) f360 chamfer operation is a very easy last step, especially when you have a plate full of parts.
I'm rebuilding my router for the third time. Last iteration was close to your current implementation. Next build ditches the aluminum plate for cast iron table saw tips filled with grouting cement. Even with 3/4" al plate I was seeing too much flex which may be what you think is backlash.
Awesome work on the machine, and interesting way of getting it to work. But the downside of that design is rigidity. You can take shallow cuts with small tools. I know its a hobby machine but it gets really old really fast waiting forever for the machine to nibble out anything bigger. For the time and energy put in this I would have made the machine base around 5 axis table / table to get more rigidity. Don’t get me wrong you made an amazing machine, just my two cents in the matter.
Amazing, and something along the lines of what I have been trying to figure out for a while. Just very very new to CNC and the computer control side is where I get stuck. It is awesome you moved to NM as well. Just be careful, we call it the land of entrapment for a reason. Is there any way to contact you? Would love to talk with you on a few questions. One day would love to get a chance to work with you, might also be able to offer you some shop space. Keep safe. Razor
Thanks for posting the project. Building the prototype is one thing. Finding software to do something with it is quite another. The usual solutions are very expensive. I built a 5 axis solution for my aim of decorating the surfaces of my wood turned objects. The A axis is a usual rotary but my B axis solution is very simple, very rigid and cheap to make. It is suitable for an 800w dc motor at least. I wouldn’t bother hanging a 2.2kw spindle on it = too heavy. I use an inexpensive 32 bit control card with GrblHal, and use Grblgru control software = free. GrblHal has backlash compensation as well as G93 capability amongst other features. Grblgru can wrap any DXF or SVG file that’s suitable around a STL model of my workpiece and generate the GCode necessary for use. Here’s a short video of my solution. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Q3nN6Hr2vbg.htmlsi=5a5KZ6NJwH-PuzLd. Happy prototyping.
at 29:46 you use a German word, but (as a German) I cant tell what that word is supposed to be. And I cant even think of anything that sounds remotely similar that might fit either.
@@satchelsieniewicz5824 I mean thanks for stating what it is called, but that was not at all my question. I just wanted to know what that supposedly German word he used for it was.
Haha... "if acetone causes cancer ... ". That's likely one of the several likely outcomes. I'm pretty reckless with my health, so this advice isn't criticizing... it's just FYI ... Anything that produces VOC (volatile organic compounds) is very bad to be inhaling. Fumes from gas, diesel, paint, paint thinner, brake cleaner, Varsol, acetone and even isopropyl alcohol. Exposure to these things will cause liver and kidney failure, chemical sensitivity, arthritis, respiratory issues chronic rashes. I know an old painter who got chemical sensitivity and pretty much had to live in a bubble. Death is not the worst thing that can happen. My father died fairly quickly from lymphoma (mechanic for 40 years) one of those tough old guys who washer stubborn stuff off his hands with WD40 and varsol... he got the easy way out as chemical sensitivity means if you pass someone in a hallway wearing too much perfume you have a severe reaction , you can use soap or shaving cream etc. Again... smelling my hoodie right now, most people wouldn't want to be sitting next to me because I smell like exhaust fumes. I'm not the safety police, just a passerby 👍
