Quoteclyevo Sorry to bring up almost a dead thread, but why not a4988 since u using 8bit board? Because the TMC2100 is smoother and produces less noise...by renatortb - Stepper Motors, Servo Motors, DC Motors
Quoteekaggrat look for silicone blanket wire on aliexpress.. it is basically silicone encased nichrome wire. u just need to stick it to the bottom of the plate with a liquid silicone gasket and vola instant heated bed... i have 2 such bed running on 220 v... only take care to coat the bed with a insulating material like polymide before putting the wire or in case of short u will have high voltagby renatortb - Experimental and Hobby
Quoteo_lampe I'm currently using 0.9° steppers rated 2.4A with the TMC drivers on my CoreXY (300x200 bed). It's not a perfect combination, but my hotend carrier and the Y-gantry are not too heavy. I would go for 0.9°/1.7A steppers and 24V! 12V is the bare minimum for TMCs. For a 32bit controller with plugin drivers, the RAPS128 are hard to beat. You can also run them on 8bit controllers, but wby renatortb - Stepper Motors, Servo Motors, DC Motors
I´m trying to find a good stepper motor for my custom CoreXY, that have a print bed of 600x400x400mm (for print RC car bodies). At first, I intend to use in the XY axis the **MKS** TMC2100 (LINK), that has this setup: The calculation method of driver current: i=Vref*1.9/2.5 Default Vref is 0.65v, Max 1.3V,Min 0. Default Current is 0.5a, Max current is 1A. I selected previously the 17HS8401 stby renatortb - Stepper Motors, Servo Motors, DC Motors
Quotedc42 If you mean the sort of cement resistors that I think you do, the problem I see is that they are not designed to transfer the heat to a metal surface. Rather they are designed to be cooled by convection. The type of power resistor that has a metal case intended to be bolted to a heatsink would be more suitable, but also more expensive. Power resistors are not cheap. You may find that iby renatortb - Experimental and Hobby
Hello folks. This is my plan to build a 600x400mm heated bed based in a 600x400x6mm aluminum plate and 20W cement resistors. I ask for help in the analisis and also for some corrections if it needed. I think it can be done. --------------------------- Informations: 3D printer: coreXY custom made. Printed build area: 600x400x400mm. Total bed area: 60x40cm = 2400cm2 Heating target: 0.5W/cm2by renatortb - Experimental and Hobby
QuotePiscanc added gt2560 board, please correct if i mistyped any of the info Thank you very much! I really appreciate any help! Cheers!by renatortb - Controllers
Added RAMBo, RUMBA and corrected some mistakes...by renatortb - Controllers
QuoteJustAnotherOne The FT232 can do "more" regarding serial communication then the ATMEGA16U2. So in this regard it is probably "better" whatever that means. But then again the serial connection is just some millimeters long and fixed PCB traces. If the ATMEGA16U2 fails serial wise then it fails in the same way the atmega2560 does. That would mean that the "better" chip has a higher risk of faby renatortb - Controllers
Quotedc42 Quoterenatortb Quotedc42 Quotethe_digital_dentist Higher microstepping gives up a little torque but reduces vibration - i.e. motors run very quietly. It's a myth that higher microstepping loses torque. The torque for a given lag angle is exactly the same whatever microstepping you use, with the exception that when going from full steps to half steps you lose about 30% of torque if youby renatortb - CoreXY Machines
Quotedc42 Quotethe_digital_dentist Higher microstepping gives up a little torque but reduces vibration - i.e. motors run very quietly. It's a myth that higher microstepping loses torque. The torque for a given lag angle is exactly the same whatever microstepping you use, with the exception that when going from full steps to half steps you lose about 30% of torque if you keep the current the sameby renatortb - CoreXY Machines
Quoteos3dp Quoterenatortb But this is for one motor only, right? I intend to use four motors, so the processor will not handle. 4x16000 = 64000 pps (Marlin = 40000). I misunderstood something? Going crazy right now! LOL! No, look at the following. Quoteo_lampe 40.000 ppm is for all steppers, but it doesn't make a difference for the CPU if it is one stepper or 8 steppers, because the step pulsesby renatortb - CoreXY Machines
------------------------------------- In my first post i worte sometinhg worng. I corrected it now: Also, i'm thinking in the Z axis with pulley/belt system with two ball screws (on which side of the print bed) conected with a belt to the motor, as seen in the image below. For a 1.8º (200 per revolution) motor, 1/6 microsteps, M8 (1.25 mm per rotation) screw and GT2 2mm belt, what's the optimumby renatortb - CoreXY Machines
Quoteo_lampe 40.000 ppm is for all steppers, but it doesn't make a difference for the CPU if it is one stepper or 8 steppers, because the step pulses are all sent simultaneously by an 8bit register. If you're in doubt what pulleys to use on the Z-axis: start with 16 tooth ( best torque ) and see, how fast you can move without skipping steps. ( two leadscrews and four linear rails are a challengeby renatortb - CoreXY Machines
QuoteDust except the image has a huge chip for the usb/serial a ATMEGA16U2 (as used on real megas) is tiny. Guess they could use a larger chip package... but why would you... I suspect that it is backwards, they are using a FT232 instead of a ATMEGA16U2 (and I bet its a clone, that windows will not work with) But regardless nether is better... I understood that they are using a FT232 insteaby renatortb - Controllers
Quotethe_digital_dentist Expecting a stepper to have any torque left beyond about 6-10 revs per sec is probably wishful thinking. Arduino/RAMPS running Marlin is limited to 40,000 pps to drive a motor. If you use 2560 usteps/mm your maximum Z axis speed will be just under 16 mm/sec, probably fast enough. But, 40,000 pps / 3200 usteps per rev = 12.5 rev/sec = 750 rpm, probably more than the moby renatortb - CoreXY Machines
Quotesigxcpu On processor is easy: 8 bit - less step pulses per second => less speed. 32 bit more pps => more speed. Get a MKS SBASE, not a MKS GEN. Revolution = rotation so the M8 has 1.25mm per rotation/revolution. Thank you for your answer. This i understand, what i don't understand is how to calculate how much step/mm the processor can do. Could you explain it to me? The MKS SBASE v1.by renatortb - CoreXY Machines
Hello folks, I've been looking to buy a Arduino 2560 + RAMPS 1.4 and i found in the MakerBase store in the Aliexpress a supposed better Arduino 2560 version. Link to the product here. They claim that this is a better version because: "1) Better compatibility, using chip FT232 alternative ATMEGA16U2. 2) Better stability, optimize heat dissipation, high-performance chips ON 1117 LDO poweby renatortb - Controllers
Quotethe_digital_dentist There isn't any optimum value, just different steps/mm values. If it can move fast enough for you it's fine. If you use large pulleys on the XY motors, the machine will theoretically be capable of higher speeds than if you use smaller pulleys, but you'll have reduced torque, so if the moving mass is high, you won't be able to print that fast anyway. In the end, the comby renatortb - CoreXY Machines
Hello folks, i need to say that i'm just started in the world of 3D printer. I'm sorry if this is a dumb question, but i couldn't find an answer until now. Buying a 3D pinter here in Brazil is very expensive and the good models costs a kidney. So i decided to build my own 3D printer based on a corexy system. But i'm struggling to understant what is the optimum XY and Z axis steps/mm in corexy sby renatortb - CoreXY Machines
[ QuoteRADDS says that it is compatible with HD44780, what does this mean? What models? The HD44780 controller is the standard for character based LCDs like 16x2, 16x4,20x4 a.s.o. I haven't digged deeper into the subject, since I use Octoprint via USB, so IDK if RADDS also supports RepRap Discount LCD ( including encoder and buzzer etc. ) Thank you for your answer, but what models i put in theby renatortb - Controllers
What models of LCD does this mean?: Support SPI Displays like Viki2 and mini Viki(direct) and RRD Graphic LCD(adapter) Support for I2C and parallel character LCDs using universal adapter by Jim Morris I'm adding RE-ARM EDIT: RADDS says that it is compatible with HD44780, what does this mean? What models? EDIT 2: made some modifications in the Excel, pelase take a look. I have some doubtsby renatortb - Controllers
Quotedc42 It's not so much the baud rate (unless you are looking at file upload speed to the SD card - see later), it's whether the USB interface has flow control. If it doesn't, then the host program has to wait for an "OK" response after each command, or at best after a few commands. General-purpose operating systems such as Windows and Linux can't schedule programs that do this efficiently wheby renatortb - Controllers
QuoteDust Your missing one important column (from my point of view) usb speed, most are limited to serial speeds, but others have virtual uarts and run full (ish) usb2 speed. The result of this is that some are dead slow and can run out of buffers on curves and other high detail parts, they also need the firmware and software to match baud rates. Others use full usb speed and just ignore baud rby renatortb - Controllers
Thank you! Yes, I catched a lot of information in the RepRap Wiki. PS: i still not decided witch board. I'm thinking in RAMPS 1.4 or MKS Gen 1.4 for starting learn more.by renatortb - Controllers
Hello folks, i'm just getting started in the world of 3D printing. In a goal to help me decide the best board for my custom coreXY based on Vulcanus V2 and Vulcanus MAX, I made a Excel 3D Printer Electronics Comparison Chart of the boards that interested me and I would like to share with you. If you wish, you can edit this Excel file, adding more boards/information or correcting me if i misunderby renatortb - Controllers