QuoteMils24 Sorry to sound stupid but how did you work that out? And also what does that mean? Is 1:10 good? My set up will be same belt and pulleys (GT2 2mm + 20 tooth) and my rods will be spaced 55mm apart. There seems to be a real split on belt centered or belt offset. I'm starting to think does it really matter?? The pitch radius of a 20 tooth GT2-2mm pulley is 6.3662 and the arm width isby etfrench - Delta Machines
QuoteMils24 etfrench, is that pulleys centred (bottom image in OP) or belt centred (top image in OP)??? Thanks Pulleys are centered. I use linear rails and the belts are GT2-2mm with 20 tooth pulleys. The arms are 60mm apart, so the ratio between the pitch radius of the pulleys and the arm distance is slightly more than 1:10.by etfrench - Delta Machines
I'll vote for centered as that is the way I designed mineby etfrench - Delta Machines
300mm tube would have a small (tiny) print area. You may be able to get offcuts of larger pipe from a company that does underground piping. +1 on using rails.by etfrench - Delta Machines
Put the effector directly in front of a tower. The right triangle formed by the arms at this position and at 20 degrees will give you the length of the arc that will contain the maximum travel for that arm. Repeat for the other 5 arms. There are one or more OpenScad delta simultators available. It shouldn't be too hard to find one.by etfrench - Delta Machines
Your diagram should be a Reuleaux Triangle to be more accurate. I'd post an image, but Photobucket is holding my photos for ransom Basically, draw an arc from each arm on the effector when it's at 90 degrees (in front of the tower). The radius of the arc is the position of that arm on the effector when it's at the maximum extension (20 degrees). Repeat for the other arm. Locate the effectorby etfrench - Delta Machines
Quotefrankvdh Quoteetfrench The further apart the arms, the more rigid the machine but the print area decreases. I'm struggling to see how increasing arm width reduces print area... is that just due to the fact that wide arms requires a large effector, which in turn means the nozzle itself can't go near to the base of each tower? Or is there more to it than that? Also, if you increase the arm lby etfrench - Delta Machines
I can't imagine an 80% rule that would be anywhere close to correct. The print bed can be totally enclosed between the towers/horizontals or extend outside the horizontals. The rule which gives the best compromise between speed and accuracy is the 60/20 degree rule. It says when the effector is centered the arms should be at or near 60 degrees. 20 degrees should be the maximum. Each set of armsby etfrench - Delta Machines
Aluminum cans are a really bad choice for casting. Try getting some aluminum (not magnesium) castings from an auto junkyard.by etfrench - General
My Teensy 3.2 has no problem running 60,000 steps per second. Changing to a 32bit processor will allow you to run faster.by etfrench - Reprappers
QuoteLykle Ah, you mean Brian's delta. Yes as he was using a different material sleeve. My drive cable is free standing. I agree completely with you that peace of mind is important, especially with long prints. Using a string to keep the magnets attached is one way to feel safe. Lykle Earlier you said that wasn't necessary.....by etfrench - General
If it works as well as the 4 axis self replicating mill, I'd be interested in seeing it.by etfrench - Reprappers
I suspect most beginning reprappers have a few internet search skills: What is it about a strain gauge that you don't understand?by etfrench - General
It's missing the option to add spring loaded tensioners between the carriages and the effector. There are holes on the effector which could be used, but they're not in the optimal position. The carriage doesn't have any holes which could be used. Can the arms get to 90 degrees with the carriage design? I'd rather see the cold zone portion of the hot end above the effector to lessen tilt effectsby etfrench - General
An easy way to make an orifice that can be modified is to use an inner metal that has a lower coefficient of thermal expansion than an outer layer of metal (or other material). Just change the temperature of the outer layer to vary the orifice diameter.by etfrench - General
QuoteLoboCNC How is your extrusion system different? How does it work? We'd love to see pictures or diagrams. I'll buy the clone on Aliexpress next weekby etfrench - General
Why ask all of these questions if you don't respond to the answers???by etfrench - General
Colors will also affect the humans in the space. An example of the wrong color for a space is painting the galley of a boat yellow. It increases the likelyhood of sea sicknessby etfrench - General
I just can see any good reason to home my delta on every layer. The home position is 290mm from the build plate. Endstop repeatability depends on the speed at which they're triggered, so you can't just rapid till the endstop triggers. If my printer missed a step and the print failed, I'd rather correct the problem and reprint. It will consume far less time than rehoming every few seconds.by etfrench - General
Getting another printer will cut your print time in halfby etfrench - General
In Slic3r you can also specify print modifiers. In your case, you would create the modifer model that just included the large nozzle infill areas. You'll have to experiment to see how the perimeters of the large nozzle infill areas would be printed.by etfrench - General
How are you going to determine if a step was missed? How much time are you willing to waste? If your printer is missing steps, you should be looking for the cause.by etfrench - General
It doesn't cause the backlash, but it may be cumulative if the backlash isn't equal in both directions and the same along the full length of the screw. Ballscrews as well as acme and trapezoidal screws have backlash with ball screws generally having the least amount. Inexpensive Chinese ballscrews can have as much or more backlash as well made acme or trapezoidal screws. p.s. Ballscrews are alby etfrench - Reprappers
Isn't the first layer always printed at a fixed Z height when you don't map the bed? If you print with a layer height that varies but keeps a fixed distance from the bed, you're just moving the errors to the next layer.by etfrench - General
That's an odd way of using nuts. The nuts are free to move in or out. They only rely on the friction between the nut and the pla to keep them in place. How hard can it be to design a proper seat for the nuts?by etfrench - General
What's in the gcode? Sorry, .g is your gcodeby etfrench - General
I print the first layer at 250C then drop the hotend temp to 240C. Bed temp for the first layer is 128C, second layer is 120C, then I drop it in 5-10 degree increments to 105C. Changing filament brands usually means recalibrating temperatures. There are temperature calibration videos on youtube and models on thingiverse that make it easy to dial in the correct temperatures.by etfrench - Reprappers
Why doesn't the bolt or threaded rod hold the nut in place?by etfrench - General
Quotescubi Hi So what site do we use to get stl files that you like to print ? Thanks Fusion 360 I haven't found an stl file on Thingiverse that didn't need modifying. It's easier to just design your own.by etfrench - General