You can use an inexpensive laser pointer to test flatness. Here's one site with an explanation:by etfrench - General
Usually brass or Oilite type bushings may need to be press fit into a cylinder with the correct ID in order to be compressed to the proper size or if undersized, they can be reamed to fit. Igus bushings definitely need compressed to fit the shaft. Properly sized bushings can be much more accurate than linear bearings, but this will depend on the class of bearings as well.by etfrench - General
GT2-5mm has up to 15mm wide belts. Since you're doing a belt drive, I assume you've read through this thread:by etfrench - General
Werner Berry shows a better way to use mechanical fasteners here. You should also consider redesigning the parts using snap-together techniques instead of mechanical fasteners.by etfrench - General
GCode is pretty simple to write. Does your controller work with manually created gCode? Here's a sample that works with LinuxCNC: (04_PULLEYMOUNT_PERIMETER_MILL_1-4IN) (CONTOUR) (T3 D=0.0591 CR=0. - ZMIN=-0.1575 - FLAT END MILL) N10 G90 G94 G17 G91.1 N15 G20 N20 G53 G0 Z0. (2D POCKET6) N25 M9 N30 T3 M6 N35 S20000 M3 N40 G54 N45 M9 N55 G0 X-0.5545 Y-1.0987by etfrench - General
In the lathe, you can put in a backer block to keep it from moving back. It all depends on the lathe/chuck design on how to do this. A jig to hold the bearing in place on the drill press can be made as follows: Clamp a small block of aluminum or steel on the drill press. Don't move it after this and it will remain centered. Drill a hole slightly smaller than the diameter of the bearing in an aby etfrench - Delta Machines
Quotedc42 Quotevreihen My only concern with using three planes in a printed socket is wear. Any wear should result in spherical indentations that perfectly match the ball. It might even be a good idea to put some grinding paste (softer than the steel balls) in the joints and then execute a gcode file that exercises them for a few hours, to run the joints in! The grinding paste will embed itselfby etfrench - Delta Machines
Uh-Oh, it looks like the followup has been recycled...by etfrench - General
JFYI: Nema 17 is a frame size (bolt pattern etc.) The actual motor can be a stepper, servo, DC, AC, or whatever It's probably more meaningful to give the torque and current requirements instead of the frame size when discussing stepper motors.by etfrench - Reprappers
Overnight mail might get you the part in timeby etfrench - Reprappers
Quoteepicepee etfrench, how much force can those take? Probably a lot more than a 3d printer will generate I know of at least one benchtop mill (bigger than a mini-mill) that uses PTFE bearings encased in a metal sleeve. I'm using PTFE tubing in a custom camera slider and it has been working nicely. It doesn't have any trouble making movements under 5 microns. PTFE can flow over time if itby etfrench - General
You could also try lining the printed bearing with ptfe, either tubing or conformable tape.by etfrench - General
Quotejanpenguin I like to test three point effector that three diagonal rods are connected. Three points form a perfect plane in geometry. I had this idea few weeks ago and was contemplating it. I found one 3D Printer company that uses three point effector with six diagonal rods yesterday. Three Sphere System (TSS) of Regards, Hughe The spiderbot system will be easier to manufacture, but youby etfrench - Delta Machines
In addition, Nema 17 and Nema 23 are just motor frame sizes. They don't specify the torque or anything else about the motor. Drivers usually are specified by the amount of current they can deliver to the motors. There are quite a few threads on the internet about creating multi-use machines, but I don't think I've seen any that were a resounding success. My CNC router uses 25mm unsupported shby etfrench - Reprappers
The print area of a delta is not a circle. It's just convenient to make the bed round. In your diagram, it's not possible for the arms of the lower left tower to reach the effector position shown.by etfrench - Delta Machines
Quoteishe7ata I use eBay because I know how to spot the good sellers from the bad ones! and PayPal is covering me too. That's the only reason. I wouldn't count on PayPal covering you. They may resolve an issue in your favor, but that doesn't mean they will actually return the money. You will be much safer using a credit card and use their dispute resolution.by etfrench - General
Drilling holes in ball bearings is fairly easy. There are two main types of bearings, chrome steel and carbon steel. The chrome steel bearings are hardened all of the way through. Carbon steel bearings are case hardened and have a soft interior. Carbide drills work for both, but if you want to thread the holes, then you'll need to get the carbon steel bearings. This ebay seller has a good reby etfrench - Delta Machines
Wire colors may be different for different manufacturers. Use a multi-meter to determine which wires are pairs. (Lots of tutorials online for this).by etfrench - Reprappers
Sorbothane would be a better choice for vibration dampening. It comes in various formulations, so you need to match it to the weight of your enclosure and machine.by etfrench - General
You should probably add a little more distance between the uprights, so the arms are not at 90 degrees. Do a search for Johann Rocholl's openscad drawing of the Kossel. It will help you determine the length of the arms and other parameters.by etfrench - General
It seems the optimum angle of the arms for the effector to be centered is 60 degrees and the minimum angle (for accuracy) is 20 degrees. This should be enough to determine the rail length once you decide how tall you want to print.by etfrench - General
The KiCad site is failing the download of the Windows .zip file. I really only need the rough dimensions of a populated board in order to fit it into my drawing.by etfrench - Controllers
Does anyone have an .stl or .iges drawing of the CRAMPS board?by etfrench - Controllers
ViaCad is a good low cost option as well. Version 7 can be found for under $50.by etfrench - General
Interestingly enough, in my current design, increasing the width 10mm only increases the DELTA_RADIUS about 3mm. That seems like it would be a worthwhile tradeoff. Thanks for the replies.by etfrench - Delta Machines
Other than ensuring the hot end and fans, etc. fit between all of the arms, what criteria should be used to determine the width of the parallel arms? Is there an optimum distance based on the print bed size?by etfrench - Delta Machines
Here's a clock made with magnetic gears (not mine):by etfrench - Look what I made!
Regular plate glass from a hardware store seems to work well for a lot of people.by etfrench - Reprappers