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Rostock, Kossel, Simpson, 3DR, and more. See: http://reprap.org/wiki/Category:Delta. Previously named "Delta Robots and Stewart Platform"
Re: Agricultural Bot - 9 years ago
As a midwesterner located in Oklahoma, I'm interested. I've been wanting to do a farm bot for a long time now and would like to collaborate.by Lawrence Kincheloe - Let's design something! (I've got an idea ...)
New Prusa at OhmSpace - 12 years ago
Greetings Oklahoma! There is a new RepRap in the state and it's home is in the new HackerSpace in Oklahoma City OhmSpace. We've been kicking out parts for a while now and I thought I would post something about it here. Find out more at !!!by Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: This group dead? - 14 years ago
So we finally got all the software and hardware twitching and under control, the extruder nozzle heating and sensing, and the machine constructed. However, we have a whole mess of calibration to do. Several axis are binding the belt, and cables need some serious routing. There are some bad solder joints on some of the boards, and we still need to master the control software. We could have a meetby Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: Making the case for the RepRap Industrial Revolution. - 14 years ago
It is my understanding that one of the reasons that PLA is so popular with the RepRap crowd is that it is a plastic that can be made from natural ingredients. Also, not all RepRap designs require a lot of metal. Delta robots and some of the scara robot designs are especially good at this. With the addition of ceramics, I think we might even be able to completely replace metals all together, butby Lawrence Kincheloe - General
Re: Fountain Pen Nibs for finer extrusion - 14 years ago
In a fountain pen, a nib is a sheet of split spring material that forms a channel that is wider at the tip than at the end when pressed down. Capillary action pulls the liquid down due to intermolecular forces that also cause surface tension. The reason for a four-nib cluster is due to the need to move in all four directions without changing the orientation of the nib. It could be possible to eby Lawrence Kincheloe - Plastic Extruder Working Group
New Mendel RepRap at the University of Oklahoma - 14 years ago
This weekend, the Robotics Club at the University of Oklahoma finished the electrical and mechanical construction of a Mendel. We're not toast worthy yet, but rest assured we'll have a naming and toasting party with University approved beverages once we get our first print! Pictures to follow.by Lawrence Kincheloe - Oklahoma City RepRap User Group
Fountain Pen Nibs for finer extrusion - 14 years ago
Its terribly impractical at the moment, but inductively heated four-nib cluster with a center shared plastic flow channel would make for some extremely fine plastic lines. Keeping everything viscous enough to flow would be a nightmare, but it's a neat idea.by Lawrence Kincheloe - Plastic Extruder Working Group
Re: This group dead? - 14 years ago
It has been hibernating. I decided that I was going to take a crack at grad school again, so I'm back at the University of Oklahoma. I also got involved back with the robotics club and am in the process of inserting some energy into the OURC RepRap project. Currently we have an order for the rest of the parts, and next week I'm going to learn how to use a lathe! (barrels and more). Goal is tby Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
As an aside, I've found a nifty way of making glass in the microwave using nichrome wire as an antenna which super heats ceramic material to its glass phase which then starts absorbing and shielding the metal. Not practical yet, but interesting.by Lawrence Kincheloe - Plastic Extruder Working Group
Re: High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
The final dimensions should fit the same diameter of the normal plastic extruder. The idea is to use the ceramic barrel as both the thermal barrier, the nozzle and the holder for the heating element. If your firing the barrel I would go the safest route and not embed the nichrome wire into the clay, but etch space to wind it on there. The nichrome can be wound around the barrel along with theby Lawrence Kincheloe - Plastic Extruder Working Group
Re: High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
Success! or something like that. I'll update more later, but it appears that microwaving clay can be done so it is non destructive to the microwave oven. Also, the coils alone get hot enough to literally glass the clay. The only problem is that leaving it in there for even a few minutes can cause it to make some pretty nifty glass chunks which aren't usable. Also, unfired wet clay makes an exceby Lawrence Kincheloe - Plastic Extruder Working Group
Re: Unified Robotics - 14 years ago
I agree actually. Once I get a robot up and running and printing plastic, I want to tie in some of the vision processing software that is getting quite mature. Hopefully, I can use it for auto-calibration and maybe in the future I can use it for resumed printing.by Lawrence Kincheloe - Robots!
Re: High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
Point of clarification, I don't know a whole lot about firing clay. I took some pottery classes in high school. Basically, for this to work, this project is going to need a current controlled power supply. If your very careful with the wire lengths and have a good ohm-meter, then you could get away with a constant voltage power supply. Image One: This is the extracted coil from the second andby Lawrence Kincheloe - Plastic Extruder Working Group
Re: High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
The reason I want to use the microwave is because I don't want to embed nichrome wire throughout the ceramic barrel. I'm hoping to use the barrel itself to act as a thermal barrier. However, I could just use multiple taps and use all loops for firing and only a select few for actual extrusion. I've looked at the microwave metal melting methods. It might be a path to explore. Actually, it wouldby Lawrence Kincheloe - Plastic Extruder Working Group
High temerature ceramic DIY extruder or: how I plan on distroying a microwave oven - 14 years ago
Like all good experiments, this one is 89% perspiration, 9% innovation, and 2% desperation. Basically the goal is to combine multiple material properties to complement each other to produce a high performance heating barrel that is easy to make and requires few tools. First part involves knowing something about ceramics. Clay based ceramics are a mixture of silicon dioxide, aluminum silicatesby Lawrence Kincheloe - Plastic Extruder Working Group
Re: Delta robots - 14 years ago
Quick update. So far so good. Parts came in last week and I've been working every night after work on this thing. I'll post some pictures later as I'm hoping for completion by next week. Some corrections, The ball bearings have to be larger. I selected 5/8 diameter bearings and I should have gone for 7/8 or 1 inch. Also, it is nearly impossible to make perfect cuts and welds at my skill levby Lawrence Kincheloe - Delta Machines
Re: Using GPL for hardware is a bad idea - 14 years ago
I wanted to post earlier, but I've been slaving away every night on my delta robot delta-strap! If there is a hell for people who make ugly welds, they have a special spot just for me! Two things: FIrst, GPL is based on copyright laws. The whole makerbot blog post is funny because there was no GPL violation as the derived designs did not contain any GPL "source". You can't copyright processes, jby Lawrence Kincheloe - Administration, Announcements, Policy
Re: cheap low profile fasteners for joining multiple parts - 14 years ago
The initial intent was to enable making fully enclosed areas and to join lengths of plastic pipe without using bulky fasteners and to build strong permanent bonds. The initial need was that I needed to encapsulate a strong magnet inside a plastic rod for use in my magnet ball bearings. However, it also allowed me to overcome a difficulty I was having with the lengths of tube I was printing beinby Lawrence Kincheloe - Mechanics
Re: and so it starts.... - 14 years ago
I'm in the process of getting in parts for the delta-strap I've designed. Most of it is in, but I'm waiting on steel tubes and magnets. I'm also going to need access to an accurate drill press, as I've got some hole saws to notch pipe with. O, and I designed a cable tie today. No clue if it works but it should be printable!by Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: cheap low profile fasteners for joining multiple parts - 14 years ago
Galaxyman7, you should post your design and its rational in its own thread! Its interesting and you've put a lot of work into it. For loosening bolts I would look at loctite, or for a super cheap version, superglue with a very light dusting of baking soda will also work. The baking soda activates the superglue without having to be exposed to air. Your right that there will always be an easy prby Lawrence Kincheloe - Mechanics
Re: cheap low profile fasteners for joining multiple parts - 14 years ago
Although interesting, it has some problems. Those zip ties are going to stretch over time if they are under load, so you can't use them for anything that you want to remain precisely in place. It might be useful to hold pieces together for glue to set. So, design in zip tie holds for all your pieces, construct them all and then set them with epoxy. also, 1/16th inch plastic sheet? for millingby Lawrence Kincheloe - Mechanics
Re: Delta robots - 14 years ago
I'll be doing a write up of the delta-strap build process soon. Probably needs its own wiki page. Double posted This is the mock-up image for a delta-strap, I'm building. Its using geared stepper motors, steel tube that is going to be welded, UHMWPE cup material, rare earth magnets, and soft steel ball bearings. I'm shooting for a build envelope of 300mm x 300mm and I'm using leg lengthsby Lawrence Kincheloe - Delta Machines
Re: help producing delta robot prototype - 14 years ago
This is the mock-up image for a delta-strap, I'm building. Its using geared stepper motors, steel tube that is going to be welded, UHMWPE cup material, rare earth magnets, and soft steel ball bearings. I'm shooting for a build envelope of 300mm x 300mm and I'm using leg lengths of Manipulator arm = 288.4995667241113899555444997387mm Base arm= 135.7645019878171246849621175241mm I went forby Lawrence Kincheloe - Delta Machines
Re: Delta robots - 14 years ago
I think your missing the point that with a delta robot there is no need for a Mendel.by Lawrence Kincheloe - Delta Machines
Re: help producing delta robot prototype - 14 years ago
If anyone is interested in helping prototype a plastic version of the delta robot, I have the stl files. Otherwise, I've decided to pull the trigger on a Delta-strap design which is going to blow everything else out of the water, or so I hope. Once I get the parts in I'll start blogging it.by Lawrence Kincheloe - Delta Machines
Re: The RRRF is broken - 14 years ago
Most of my personal frustration is spending the time to develop new ideas and having no way to test them in a feasible manner. For example, if I wanted to pay Shapeways for a complete set of the parts I want, (assuming they are perfect the first time!) it would cost somewhere around $200+. If I wanted to do it myself and build a Mendel, it would cost roughly $500-$650 to pool parts together.by Lawrence Kincheloe - Administration, Announcements, Policy
Re: and so it starts.... - 14 years ago
According to google, Edmond Branch Library 10 South Boulevard Street, Edmond, OK 73034-3798 (405) 341-9282 Confirmation would be nice.by Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: Hackerspace forum - 14 years ago
Then I'm looking forward to the improvements.by Lawrence Kincheloe - Oklahoma City RepRap User Group
Re: Argument Kills Uploads - 14 years ago
Good article, I would say that, "Arguments kill collaboration". Particularly, because the original quote was in reference to contracts, and the sentiment was that once you stop working on the problem and start discussing internal personal differences, you loose focus of your initial goals. Being human, it can be hard to step back and get on track again.by Lawrence Kincheloe - Administration, Announcements, Policy
Re: New to the reprap crowd, have a few questions. - 14 years ago
I'm sure you know that there are already wire welding robot arms. I remember a research paper that made a pot out of metal using that technique in the 80's I believe. The problem was cost of fabrication. Welding wire and the energy to melt it is usually very inefficient in terms of thermal loss, so its prohibitively expensive. Personally, I have some ideas about doing something like this, butby Lawrence Kincheloe - General