Re: powerlolu ordering
Do you need 10A drivers? Are you driving NEMA-34 motors in parallel?
View ArticleRe: powerlolu ordering
not really just building a smaller prototype ( still pretty big) as a proof of concept for the much bigger one and for the sake of having a functional machine for my kick starter. I would much rather...
View ArticleRe: DRV8825 "skipping" microsteps
Quotepeepsalot OK I double checked my work and it turns out I had accidentally soldered the wrong pin. Setting to fast decay does fix the missed microsteps. How is the noise afterward? Also, along...
View ArticleRe: DRV8825 "skipping" microsteps
Tried the diode hack with 1N5408 diodes and I think something is wrong. The extruder doesn't move at all. I made sure they were on different phases of the motor. :S
View ArticleSpeed and torque calculation of stepper motor
The bipolar geared stepper motor I am planning to use has a resistance/ phase of 8.5 ohms per phase, inductance of 2.14mH per phase , normal current per phase is 2 amps, holding torque of motor is...
View ArticleRe: Speed and torque calculation of stepper motor
The torque calculation is easy. The drum radius is 0.05m plus 0.009mm for the cable, the cable hanging off it has 12Kg mass worst case, and g is approx. 9.8. So the torque you need is 0.059 * 9.8 * 12...
View ArticleRe: powerlolu ordering
But yes i will be eventually driving nema 34 motors on the x axis... since it has to function as a cnc mill too and its going to have a build area of 1m^3
View ArticleRe: Stepper Motors from old Laser Printers
Hi Guys, I finally found time to wire the board and came across an issue with the Minebea Type 17PM-K018-G22ST. I think it's wired up correctly but when giving the command to turn it rotates very...
View ArticleRe: Stepper Motors from old Laser Printers
The whining indicates you are using too much current already. Some Ramps boards have bridges underneath the microstepping jumpers. They are set to 1/16 unless you cut the traces or be brave and burn...
View ArticleRe: Stepper Motors from old Laser Printers
Hi do you mean that below the jumpers are soldering bridges or do you mean on the bottom side of the board? Concerning the whining, to me it looks more like the motor is stopped between two full steps...
View ArticleRe: Stepper Motors from old Laser Printers
okay guys, now it's getting really strange, i just flashed my Arduino with this test firmware [reprap.org] and this is moving the motors perfectly fine... any idea why they won't move correctly with...
View ArticleRe: Stepper Motors from old Laser Printers
try reducing feed rate and acceleration #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,4000,500} // default steps per unit for Ultimaker #define DEFAULT_MAX_FEEDRATE {300, 300, 5, 25} // (mm/sec) #define...
View ArticleRe: Stepper Motors from old Laser Printers
Thanks amigob, looks like that puts me on the right way i've now set those values and the motor starts to rotate as it should be #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,4000,500} #define...
View ArticleRe: Stepper Motors from old Laser Printers
good to hear, if you don't have enough 17PM-K018-G22ST and go for a prusa printer then the SHINANO stepper is enough for the wade's extruder the 1 in 5 reduction makes that more then strong enough.
View ArticleRe: Stepper Motors from old Laser Printers
Thanks, I'll have more than enough 17PM-K018-G22ST (50% more than I can use myself), thought of selling the remaining on e-bay. In fact it currently looks like I'll be going for 2 Prusa printers one...
View ArticleStepper motor power supply
Hi there, After a lot of work on my cnc machine (mill) i am finally getting to finishing the mechanical part. To continue, i need a power supply for my stepper motors, which i have some questions...
View ArticleHelp with Project List
I am a diy guy but haven't had experience with motors, programming, etc so I've been researching online how and what to buy for my project. Confusing to say the least. I am trying to create a self...
View ArticleRe: Stepper motor power supply
I think the "rated" supply is relative to the reference voltage at the driver, which is typically 1.9V or thereabouts. Your stepper is a typical NEMA17, which should work just fine off 12V. An ATX...
View ArticleRe: Help with Project List
You could also look at servos, which are bidirectional DC motors with limited rotational movement. But, if it was me, I'd set up the bowl with an off-centre axle and a small counter-weight or spring....
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