Here is what I'm thinking of for the frame design. Extrusions are Misumi 30x30 GFS 6 series. Frame dimensions: Approximately 1500mm x 700mm wide (square). Leveling feet/wheels will be added to the base legs. Uninterruptable power supply will be mounted in the bottom area. Side enclosure panels will be polycarbonate.by klcjr89 - Extruded Aluminum Frames
Quoteo_lampe QuoteI think I want to implement this design, except without moving the mass of the motors like in the video above shows. Will be interesting to see, how? My first idea was: bevelled gears and a keyed smooth rod to drive the bevelled gear. Pretty easy, just dual leadscrews coupled with a belt for each axis. Think of the ultimaker, but with leadscrews. No keyed shafts or anything shby klcjr89 - Extruded Aluminum Frames
I think a servo isn't needed for the maxwell kinematic coupling they're using. I read the entirety of the article, and still think the kinematic coupling with SmCo magnets would've been ideal.by klcjr89 - CoreXY Machines
Hi, I really like your build! I am considering a cross style XY gantry for my future printer build as well.by klcjr89 - Extruded Aluminum Frames
I have been thinking about which way I want to go in designing my next printer. I found this video on YouTube: Picture if you can't watch the video: Which shows a leadscrew driven crossed bar XY gantry. I think I want to implement this design, except without moving the mass of the motors like in the video above shows. I had an all leadscrew driven axes i3 style printer and it worked very welby klcjr89 - Extruded Aluminum Frames
Should this thread be moved here?by klcjr89 - Stepper Motors, Servo Motors, DC Motors
QuoteMKSA I wonder how you could mass produce these and be competitive with the many current mfgs, making these for decades and in various form: flat, two axes (X Y) or even in round form (the guide is round, the coils around it ). And there is a lot more than just cut slots in a bar which in fact is the easiest part if you have the machine tools. There's really only one manufacturer, and they hby klcjr89 - Stepper Motors, Servo Motors, DC Motors
QuoteTrakyan This may be a stupid idea, but instead of cutting slots, has anyone considered laminating thin sheets of steel/iron and some other material into a stack, then taking a slice of that? As long as your sheet material is the right thickness, and to relatively good tolerance it should give you a strip with alternating magnetic and non magnetic surfaces. Again, could be a stupid idea, justby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quoteo_lampe I'm sure robotdigg would be able to send you rails without too many mounting holes, if you ask. The end goal is to not need the linear carriages, do you think if the linear rail with holes works, it would be possible to design the forcer to be the carriage block as well? Not sure how hard it'd be to design good tolerance 3D printed recirculating balls.by klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quote691175002 The holes will certainly reduce motor force, but that doesn't guarantee it will lose steps. The H2W 0602 forcer requires 18mm wide teeth to generate 10N of force. I assume that their rail is appropriately sized, so we can assume that a 15mm wide rail can generate ~8N and the 9mm sections around the holes will do ~5N. Of course a hole only affects one half of the forcer, and onlyby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quote691175002 The most difficult part of the project will likely be finding appropriate rail and cutting grooves in it. I think you might end up needing one of the back-mounting variations (ex: ) because hole counterbores in standard rail might cause issues. The problem with using a bottom mounted linear guide, such as the AG15 series, is that they're hard to come by and also can't be mountedby klcjr89 - Stepper Motors, Servo Motors, DC Motors
I have found out that the platen bars are made of 1018 steel, and that the Misumi linear guide rails are made from 1045 steel, so there is ~0.27% less iron in the linear guide rail than the 1018 steel. I hope this won't affect magnetic permeability too much.by klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quotedc42 Given that the magnetic circuit will include a significant airgap, I doubt that it will make much difference. But I don't consider myself to be an expert on this matter. David, I found this excerpt in the linear stepper design handbook: QuoteThe forcer armature must be made of silicon steel laminated sheets, having high saturation level and low specific losses. The flux density in thby klcjr89 - Stepper Motors, Servo Motors, DC Motors
I have sourced and bought both 0.25mm grain-oriented silicon steel and 0.35mm non-grain oriented silicon steel. Do you know which one would be better? Now to wait for the steel to arrive and find a laser cutting facility.by klcjr89 - Stepper Motors, Servo Motors, DC Motors
Here's what a toothed MGN15 rail looks like modeled. The forcer would go in between the two carriage blocks. The flux density will be reduced on the bolt holes, but the only way to see if it will be an issue is to just try it first. Trying to find a wire EDM facility next for cutting the teeth. Hopefully this will be inexpensive since it's an easy shape to cut repeated several times?by klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quotecozmicray NOT a good example for 3D printing And a great example of negativity. Like alot of your posts indicate.by klcjr89 - CoreXY Machines
Quotedc42 Quoteklcjr89 Quoteo_lampe You should've kept the forcer until you've made a decent working rail. Now you have to start with narda and it will be hard to find out which part is OK or not. Or was it so cheap, because it was sold as defect? Cheap because defective. They aren’t hard to come by, and I’m still devising the best way to cut slots in the linear rail effectively using relativelby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quoteo_lampe You should've kept the forcer until you've made a decent working rail. Now you have to start with narda and it will be hard to find out which part is OK or not. Or was it so cheap, because it was sold as defect? Cheap because defective. They aren’t hard to come by, and I’m still devising the best way to cut slots in the linear rail effectively using relatively easy to get tools.by klcjr89 - Stepper Motors, Servo Motors, DC Motors
@dc42, what's your take on the following specs and performance curves to see if the idea should be abandoned or not? Thanks!by klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quotedc42 Quoteklcjr89 How many Newtons of force are required for 3D printing? The one I tore apart was 8.9 Newtons. That's quote low. We typically use stepper motor with 25 to 50Ncm of torque at rated current. If you put a 20 tooth GT2 pulley on one, the effective pulley radius is about 6.4mm, which means the holding force on the belt at rated current is about 40N to 80N. Are you sure that mucby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quote691175002 The most difficult part of the project will likely be finding appropriate rail and cutting grooves in it. I think you might end up needing one of the back-mounting variations (ex: ) because hole counterbores in standard rail might cause issues. I noticed there are commercial forcer platens with counterbored holes in the top side, so it probably doesn't effect it too much. How mby klcjr89 - Stepper Motors, Servo Motors, DC Motors
I have done some more work, and have determined that the magnet wire size is 28 AWG. There are 92 turns of wire per phase (probably 90 actually). There are 60 laminations on each side of the phase coil, so there are 120 laminations per phase. Each lamination thickness is 0.25mm. Now that the reverse engineering is complete, trying to figure out where to go from here?by klcjr89 - Stepper Motors, Servo Motors, DC Motors
The harvest was very successful! Spent some time cleaning up the mess and learned quite alot on how these are made. Luckily the blow torch didn't destroy anything other than the permanent magnet's magnetism. The main housing is aluminum and is grounded via a seperate wire, so that's why there were five wires. The ground wire was riveted into the housing, which you can see the rivet in the bottomby klcjr89 - Stepper Motors, Servo Motors, DC Motors
I had to use a blowtorch to dissect it, as industrial potting compound was used. The housing is on the left, and the two phases are on the right. Will clean up the char next.by klcjr89 - Stepper Motors, Servo Motors, DC Motors
I scored the bargain of the century, and picked up a $900 forcer for $35. This is the smallest one they make, and it's going to sacrifice itself for dissection. Phase resistance: 2 ohms Rated current: 1.5 amps Inductance: 1.2mH Force: 8.9 Newtonsby klcjr89 - Stepper Motors, Servo Motors, DC Motors
QuoteVigilant Quoteklcjr89 QuoteVigilant Why do you think people are having z banding problems? Low qualitiy Chinese printers comes to mind at first. Then do show us that an unguided ball screw can produce nice prints. If you're successful you can start a trend in building printers. I will attempt it eventually on a printer meant just for experiments, I just have alot of other projects goingby klcjr89 - CoreXY Machines
QuoteVigilant Why do you think people are having z banding problems? Low qualitiy Chinese printers comes to mind at first.by klcjr89 - CoreXY Machines
Quote691175002 The Hiwins are stainless, I'm not sure about the clones: Maybe do a test run with Chinese rail; but if you are going to go through the trouble of cutting grooves I feel like you might as well use high quality rail. Misumi offers their MGN equivalent in both carbon and stainless versions. You will probably have to modify the grease seals on the blocks or they will get caught inby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Quote691175002 You are primarily concerned with magnetic permeability, which is why soft iron or electrical steels are often used. In my limited experience its nearly impossible to buy the fancy stuff, so most hobbyists default to durabar or the usual steels. Modifying a linear rail is a very interesting idea. I think you might have to stay away from the MG series of rails though, as they arby klcjr89 - Stepper Motors, Servo Motors, DC Motors
Is the linear guide not magnetic and steel? Last time I checked my neo magnets jumped onto them. Why would they be unsitable directly? Making a jig and keeping precision won't be too hard I feel. A radial arm saw with an abrasive disc would be a good place to start.by klcjr89 - Stepper Motors, Servo Motors, DC Motors