Stepper Motors do not move (2 replies)

April 12, 2015, 1:49 am

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Hello everybody,

I am looking for a bit of help.
I know the subject come up often in this forum but I have not been able to find the answer in everything that has been proposed.
Trouble is the following:
I built up a mendel type of printer. Setup: Nema 17, Megatronics 2.0, pololu DRV8825, volts and amps correct. Using Marlin and repetier.
I used the board testing file and motors are all moving correctly, switching directions.
But when I upload marlin and use repetier, connection is ok (I can switch on/off heatbed/hotend/fan etc.) but not the motors...
They do not move but make a whining noise instead. And there is resistance if I try to move them.
So I must be doing something wrong in my configuration.h file...
for the steps, I calculated this: (considering the microstepping of the DRV8825 at 1/32, GT2 belt with a 2mm pitch and 20 teeths)
#define DEFAULT_AXIS_STEPS_PER_UNIT {160,160,5120,582}
#define DEFAULT_MAX_FEEDRATE {100, 100, 2, 10}

I lowered feedrates as sugested in another post but it does not change the problem.
I however do not see how this part of my configuration may change something to the movement of the motors.
Is there another part of the config file that I have to modify?

Any suggestion welcome!

Thanks a lot,


Tom

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Should I oil stepper motors? (2 replies)

April 17, 2015, 1:38 am

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Just wondering - I have the usual set of NEMA17 stepper motors on my Prusa i3, and 4 others on a delta I'm currently building.

Should I lubricate them now and again? And, if so, where, and how much?

technical issue on paralleling 4 z-azis stepper motors (5 replies)

April 22, 2015, 1:36 am

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hello:

I am current plan to have DIY 3D printer that need 4 z-axis stepper motors.

I have tried traditional wire connection with mainboard with one single output step motor source, and parallel connecting two stepper motors on Z-axis,


However when same case happen but sharing four motors, it may not have enough current to run it, although from electronic theory that the voltage should remain the same, am I correct?

So my question is,
Does any hardware device that I can input extra electric power on this device in order to multiply the existing current, so that it have enough current to run 4 stepper motor?

Thanks,

choice of stepper motors (no replies)

April 21, 2015, 1:13 am

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I always find 42 stepper motor for x and y axis,
I am wondering if this is necessary to have such large motor for lightweight motion such as x and y axis,

If there is any choice for smaller stepper motor?
Does smaller mean cheaper as well?
Does it have to be compatible to motor driver as well, as far as I know most mainboard are using A4988 or DRV8825?

Thanks

alternative to a4988 and drv8825 (2 replies)

April 23, 2015, 9:17 am

≫ Next: RUMBA/A4988s w/24V result in motors working erratically (1 reply)

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hi everyone
i wonder what is the cheapest alternative to a4988 and drv4825 which didn't required manual adjusting
to use with nema 17 1,2a stepper

thanks
fabrice

RUMBA/A4988s w/24V result in motors working erratically (1 reply)

April 30, 2015, 6:18 am

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I am upgrading from a 12V power supply to a 24V power supply on my RUMBA system, and have a 24V E3D and heated bed. I use Repetier, and have tested the hot end and heated bed at 24V, no issues. I have Pololu A4988 motor drivers, and when I attempt to move any of the motors (X,Y, Z, E), I get erratic motor behavior, not at all what I expected. I suspect I am hitting some sort of current limit with the pololus. Is there some method I should follow to recalibrate these pololus to be able to power them with 24V? I know their input voltage range is 8-35V - it just seems like something isn't set right.

Thoughts/help?

Thanks,
Rob

Nema 17 motor wires (3 replies)

May 4, 2015, 7:45 am

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Hi,
I bought a sc42sth47-1648a 1.8 degree 2 phase motor to use with a different extruder setup. When I received the motor, there are 4 wires sticking out of the motor with no connector at the end. I received no wiring diagram for the motor. The wire colors are black, blue, green and red. I looked into the opening they come out of and the red and green come from the right and the blue and black come from the left to exit that opening.. Anyone around that could give me an educated guess or knows the order I should put them into a connector to plug onto a ramps 1.4 board?

Thanks, Vance.

Silent StepStick What Controller (no replies)

May 5, 2015, 9:25 pm

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I am looking into the Silent StepStick Stepper Motor Drivers and was wondering; does anyone have any experience of them? What controller would be the best to use for these on a delta machine?

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DRV8825 vs TMC2100 vs THB6128 (4 replies)

May 12, 2015, 5:27 am

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One would think different, but i definitaley see the difference between 32 and 16 microsteps in terms of print quality.
When looking at a flat wall my extruder (BulldogXL/E3D V6) has much less "ripples" which come from the pulsing of my extruder stepper.

the watterodt trinamic TMC2100 drivers have "256th" microstepping which is essentially 16th microstepping multiplied by factor of 16 to give 256th pseudo-microstepping.
In the usable mode (not the totally silent mode) every step is multiplied by 16 to give 256 microsteps with an accuracy of 16th microstepping but with accustic noise saving of real 256th microstepping.

In stark contrast to this the RAPS128 give real 128 microstepping with both the resolution of 128 microstepping plus the little noise one 128th microstep makes. I don´t think that I could differentiate 128th microstepping from 64 to 32 in terms of print quality, but as I already said 16 to 32 make a differnce IMHO.

So, the question is, what stepper drivers should I use?

Since I already use DRV8825s, and I do see a difference in print quality, going for the TMC2100 will result in less noise but will actually be a step back when we talk about microstepping... Or will the multiplied step ratio also result in finer stepper pulses and therefore a better print appearance?

Another thing will be upcoming, not yet supported features.
I think both (TMC2100 and THB6128) drivers have the feature to report missed/skipped steps to the firmware. This is something very cool an I think that future releases of smoothie/marlin will support this.


ok, so what to go for?
stay with the DRv8825s which are already a huge improvement to the 4988 allegros or invest some 60-80€ and try one of the new drivers? And If so, which one would you choose?

Stepper motor for prusa i3 (no replies)

May 12, 2015, 4:14 am

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I am currently sourcing stepper motors for my prusa i3. Is this motor ok? The holding torque looks alright (5.0kg/cm) but the motor is short length is only 34mm.
Is it fine?

Stepper jams/sticks (3 replies)

May 12, 2015, 2:53 pm

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I replaced my Printrboard controller board due to some mysterious damage (read about it here [forums.reprap.org]).

I flashed the board with the same Marlin firmware I'd used on the previous Printrboard. Everything seemed to work ok (with the exception of the fan). Started a print run and after about 3 layers into it, the steppers started jamming/sticking. Started with the y-axis, but eventually they were all doing it. Could it be the voltage is too high?

Stepper Motor Angle and Time Delay (2 replies)

May 19, 2015, 10:43 am

≫ Next: Basics of Stepper Motor (2 replies)

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Hi guys,

I have no experience programming stepper motors in the past but I want to know if it is possible to program a motor to rotate 45 degrees every 1.5 hours or 90 minutes.

The motor I'm using is a bipolar stepper motor (model number: FL86STH156-6204B) I have a driver and transformer to change the 220V AC to the lower DC required for the motor. Here's a link to the motors details. [oceancontrols.com.au]

All I need to know is if it is possible to program this motor to do what I want and if so is it simple or complex to do so.

Thanks in advance for any help.

TC.

Basics of Stepper Motor (2 replies)

May 26, 2015, 10:45 am

≫ Next: Did anyone used linear hall sensors on BLDCs for position sensing? (12 replies)

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Hi all,

We are using stepper motor from sanyodenki (SH2863-5141) for one of our projects. Also we are using Stepper motor drive from US Digital (MD2S-P)

[www.usdigital.com]

If we see the motor datasheet its resistance is 1ohm and rated current is 4A, so that the consumed power is P =I2R = 16W. So if we power the driver with a 48V supply the motor is taking almost I= 16/48 = 0.33A which i can see directly from the power supply(the power supply will show how much current the circuit draws). Upto this everything is ok(Standstill). But when we start rotating the motor the current increases. If we keep on increasing the speed, current increases to a point from where it starts decreasing.

The drive manufacturers says that the drive wont allow more than rated current to flow through the motor windings . Then where does this excess current flow?. Can anyone tell me why the current increases if we increase the speed and then it decreases after a certain speed. Is it because of the drive? Whats the physics behind increase in current when we increase the speed.

Did anyone used linear hall sensors on BLDCs for position sensing? (12 replies)

June 7, 2015, 12:58 pm

≫ Next: Hard to find stepper motor replacement (no replies)

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I am searching for a suitable solution for using DC motors (actually BLDC) to create closed-loop position controls that could replace/improve over the steppers we use in most of our 3D printers.

While I do have several motors running successfully with my code: [www.youmagine.com] one key part of this quest is to get the price right. Not many are going to buy a $100 motor just to keep their printers from skipping a step occasionally.

So I am working to get the cost down to a similar level than a stepper plus its drive electronics (at around $15 each).

All my tests so far have use incremental encoders for providing position feedback.

But recently the use of linear hall sensors to both help with BLDC conmutation and figure out the shaft position without the need of an encoder have been brought up to my attention.

So here is my question to you guys: have you used linear hall sensors to replace an incremental encoder with success?

I have found a paper that suggests it can be done easily: [homes.cs.washington.edu] but I will be more confident if a fellow reprapper already tested that solution space.

Suffice is to say that dropping the encoder will further decrese the cost of such a closed-loop BLDC contraption.

Thanks a lot,

misan

Hard to find stepper motor replacement (no replies)

June 8, 2015, 7:57 am

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Hi all,

I am looking for a specific stepper motor as a spare part (for scientific equipment).... This seems to be kind of difficult as Rotalink won't sell to anyone except for licensed partners.

Motor is a Rotalink M234118C632 3-phase unipolar hybrid stepper motor (1.8°/step, 12 V, 0.38 A, 32 Ohms, 40 mH, 0.36 Nm holding torque, 0.03 Nm detent torque)

I was hoping that someone knows where to get a similar motor, as I am growing desperate here... I'm thankful for any hit you can provide.

cheers,
powerarcs

EDIT: Here's the datasheet

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Motor Only Moves in One Direction! (3 replies)

June 9, 2015, 12:18 pm

≫ Next: Stepper Motor Hell (2 replies)

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Hello!

I'm working on getting my machine up and running using Marlin firmware - but I'm having some problems. The X-axis motor only moves to the left. This is slightly complicated by the fact that I'm using Powerlolu stepper motor drivers

I have searched this forum and tried some of the suggestions with no luck so far -

• I have removed all the endstops and jumped the endstop pins together - sending M119 shows that all the endstops are open
• I have tried using the RAMPSTestCode.pde (everything lights up but the motor only moves in one direction)
• I've even switched out my motors and tried a different RAMPs board.

Does anyone have any experience with the powerlolu stepper driver? I suspect I'm wiring that incorrectly?

UYtqpX8.png

I'm particularly unclear about the circled GND and Voltage - I interpreted that wiring diagram as saying that if I'm using an external power supply (which I am - 24V) then don't use those lines at all
Thanks!

Stepper Motor Hell (2 replies)

June 13, 2015, 12:29 pm

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Hello everybody,

I am having a really hard time trying to make my stepper motors to work ...
What i am using:
- ramps 1.4
- A4988 stepper motor driver
- 200 steps motor (17HSR1006-25)
- marlin 1.0.2-1

I tried a lot of things ... Checking the motors wires, playing with the micro-stepping, the driver calibration, acceleration constant definition, the feedrate ... but I can't get a reliable and smooth movement.

Most of the time, all i am getting is this something like this type of "vibration" [vid.me] (slower or faster, depending of the feedrate I use with the 'move' command, stronger or weaker depending of the driver calibration).

Any idea, tips or link concerning this subject would be highly appreciated.

Do the heatsinks on a A4988 make you nervous? (no replies)

June 14, 2015, 6:28 pm

≫ Next: Driver for 42BYGHM810 motor (4 replies)

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I look at the heatsinks on a cheap A4988 board and they make me nervous. The sit very close to some of the passive components on the board. Does this bother anyone else? Any risk of them shorting something out?

Driver for 42BYGHM810 motor (4 replies)

June 17, 2015, 4:07 am

≫ Next: Z axis lose steps (no replies)

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Hi there

I am the owner of 4 pcs. of 42BYGHM810 ( I think ) and am looking for a driver for the motors.

I am having a little problem finding drivers for the motor, the Voltage of 1,92V and Current of 2.4A is what is bugging me :(

My plan is to have an Arduino to drive the motors:

Could any of you suggest a useable driver for me?

The specs i have can be seen below here.

Thanks a lot
Søren


Frame Size: NEMA17

Step Angle: 0.9 degree

Voltage: 1.92V

Current: 2.4 A/phase

Resistance: 0.8 Ohm/phase

Inductance: 1.8 mH/phase

Holding torque: 4200g-cm 60OZ-IN

Rotor inertia: 68 g-cm2

Detent torque: 0.22kg-cm

Number of wire leads: 4

Weight: 0.38kgs

Length: 48mm

Motor Shaft: 5mm

Z axis lose steps (no replies)

June 19, 2015, 11:08 am

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Hello everybody, a little thing with my z axis is that "losing steps". Axis moves pretty well by hand and when I give him order to move 10mm it moved 10mm :( but all my prints at height is smaller. I print a part 10mm and is 7.6mm, I print a part 96mm and is 62mm.

I use 2 nema 17 and connected by series, I reduse maxfeed and acceleration and steps I let at 4000.

Do you have any suggestion? Should I try connect them in parallel?

Thanks Panos