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Convert stepper motor to Dc Motor (3 replies)

November 8, 2012, 3:07 pm
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I have a small conveyor that has a Pacific Scientific step motor in it. (Attached Pictures). I though that the motor would be a standard dc motor and I am not familiar with stepper motors. I run want to motor to run continuously. I don't need for it to go in to reverse ever.

My questions is how can I get this motor to work without a controller. Just run in one direction.

There is 5 wires coming off the motor. Red, black, green, yellow, and orange.
The motor says its 5.4vdc

Thanks
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A4988 Black edition? (8 replies)

November 23, 2012, 8:35 am
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Hey everyone,

I just burnt out a stepper on my RAMPS trying to get my z-axis moving. Rookie mistake, but thankfully the drivers are easy to swap out. What I was wondering is if anyone has tried the "Black Edition" of Pololu's A4988 stepper, as described here. They're an extra $4, but it would be nice if they really are noticeably cooler than the standard ones.


Thanks a bunch,
Chris
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Replacement of Steeper with DC Motor (2 replies)

November 13, 2012, 8:41 am
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I bought a converyor belt system and I want to replace the stepper motor with a DC motor. (Don't want to deal with the controls)

My question is the motor is a 34 nema. Is there a motor that would be a direct replacement. The current stepper motor is a pacific scientific model: E31NRHT-LNN-NS-01. Thanks for your help.
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GT2 belts and pulleys - out of stock everywhere? (1 reply)

November 23, 2012, 8:43 am
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First, pardon me if this is not the right forum, but I can't seem to find a general hardware forum.

I have some NEMA 17 motors with 5mm shafts, and I've been looking for GT2 36 teeth pulleys and belts in the US. Up until a few weeks ago everything was fine, but just this week when I came to order they seem to be sold out - just about everywhere.

I sent out a few emails but so far no one has responded.

Anyone know where I can get some? looking for 850 tooth belts.

Thanks,
Steve
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z-axis are not turning... (3 replies)

November 23, 2012, 5:49 am
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Hello fellow builders,

i have a problem and i cannot find the solutions.
Finally i finished my prusa mendell. When i wanted to test it i saw that all motors worked exept the z-axis. The meke a sound but won't turn. i disassembled them and tested them again without anything mounted to the z-axis motors. I started the sotware Pronterface where you have 3 different options to test the motor. 0,1-1 and 10. When select 0.1 both motors turn. when i select 1, both motors turn. But when i select 10 both motors make 1 click (1,8mm) and then stop and only make a noise. when i assemble the motors again and test it the same way....only the option 0.1 does somethimes something, others do nothing...they only make a noise.

These are my specs of the prusa.
1 x computer power supply that delivers 12V and 8A
1 x sanguinololu v3.1A

personaly i think that it is a power issue.....that the motors are nt getting enough power to get the job done, but a do not know for sure...and bfore i go out and buy me one i would like to have your opinion.

Hope my englisch is undrstandable enough for you to read the problem.

Many thanks

Iwan
The Netherlands.
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Jerky Stepper Movement and Idle Pulsing (1 reply)

November 25, 2012, 2:50 am
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Hi Everybody,
I've finally got my printer assembled, and I'm having issues with my stepper motors. I got them from here: [www.robosprout.com] and I'm driving them with pololus and a Generation 7 1.4 electronics board with a recent checkout of Teacup firmware essentially stock. The symptoms I'm experiencing are as follows and affects ALL steppers, however I'll describe them in terms of the X axis.

If I command the X axis to move left using pronterface, most of the time it will move left something that looks like the appropriate number of units. Sometimes it will be very jerky and may or may not travel the expected distance. With a short distance such as .1 I will hear it engage briefly but usually will not observe any perceptible movement. Following any stepper activity the stepper motor will make a regular "pulse" or "click" of varying volume for a short period (almost exactly 30 seconds). During the pulsing the axle will move a small amount each pulse. Finally, sometimes upon issuing a command the X axis will move the opposite direction of what I requested.

My first question is: is it possible these steppers are wired wrong? I assume that if the steppers were wired wrong I would never get any movement beyond moving between two adjacent steps.

My second question is, what could be causing this issue? I read that adjusting the potentiometer on the pololu to reduce the current could address this issue, but I dialed it all the way to the lowest current, and increased the current until the steppers would move, the pulsing returned before the steppers had enough current to move.

Thanks for any and all help,
Dan
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Nema 14 With 60oz/in? (1 reply)

December 12, 2012, 9:00 am
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I am looking for a Nema14 stepper with ~60oz/in. They exist here: [www.stepper-motors.net] but I can't find anywhere to buy.

Anyone got any leads?
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Stepper w/Belt Drive in Z-Axis, Possible? (3 replies)

December 11, 2012, 8:35 pm
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I haven't seen anyone doing a Z-Axis stepper driven belt drive. The obvious answer is that the steppers won't hold the torque when not charged, but has anyone come up with a solution around this, either through programming or a counterweight, or done this in some other way that I have yet to think of?
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Raising & lowering an object (2 replies)

December 13, 2012, 3:03 pm
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I'm planning a project where a stepper raises a hatch cover with a rope and pulley system. It will then hold in place for a period of time then lower it.

I see no problem in raising and lowering it as long as the load is within the capacity of the motor but can a stepper motor control the descent of an an object?
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Stepper motor issues (no replies)

December 29, 2012, 6:43 pm
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I setup a prusa mendel with sanguinololu and when I run pronterface I can control the x axis and extruder fine, but the y axis that move the print floor will only move an a few cm before it stops responding, the z axis will go up but not down, and the up movement doesn't seem right, it will move only on the highest amount of movement, and then will humm a little first and then start moving. I have tried adjusting the pot's on each stepper driver and have swapped the stepper drivers (x-axis that works fine with z-axis with no change)

any ideas?

Edit: also tried using ReplicatorG with the prusa.xml file, it controlled the x-axis as well, but the y axis would work for a few clicks and then quit, the z axis was quite interesting and after re-investingating it does the same with pronterface - if I click up it works, however if I click down it does not work, but if I click up again it won't work, but if I click up again after that it works and so on. for example if I click down 3 times, and then click up the motors will not actually turn to go up till the 4th click

also when I turn on the heated bed and extruder heater in pronterface the display shows the temperature going up a some but voltmeter with a thermometer attachment shows no increase in temp
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Can one stepper motor drive another? (10 replies)

February 20, 2013, 5:53 pm
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Is it possible to connect one stepper motor to another stepper motor to translate rotation from the first to the second? i.e. rotate the shaft on the first one by hand and have that rotation duplicated on the driven motor.
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are these motors good? (12 replies)

March 13, 2013, 10:35 am
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Hi everybody,
i just want to know if these motors are strong enough for a prusa:
JAPAN SERVO KH42HM2B046
MINEBEA TYPE 17PM-K106-05V

I can't find the proper datasheet and i found some conflicting information.
Can anyone help me, please?

thanks
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Stepper motor to low curent not moving ...to high curent to hot (2 replies)

February 27, 2013, 4:51 am
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Hello,

i have a problem, my mottors do not spean and whene i raise the power it gets very hot and laud... and they stiil make a lot of noiz even whene the curent is very low ...

I have generation 6 and the mottors are DC 6V 0.8A

Thank you.
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best motor: high torque or high resolution? (2 replies)

March 1, 2013, 11:23 am
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Hi everybody,
i have a question:
which is the best motor?

4200 g/cm of torque and 1.8° of resolution
or
4800 g/cm of torque and 0.9° of resolution?

For the Z axis i think that there is no problem of torque and resolution, but i want to know whic is the best motor for axis X and Y.
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Stepper Motor Codes (12 replies)

February 28, 2013, 5:03 pm
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I found a potential deal on stepper motors at my local hobby shop. They've got these Nema 17s (product code 17pm-k442-g4vs) listed as unipolar, but they only have 4 wires.

Am I correct in my assumption that 4 wires equals bipolar?

I'm trying to dig up a datasheet, but slow goings. Anyone know how to decipher the product code?
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(:P) i tested a new stepper (:P) (no replies)

February 27, 2013, 3:12 am
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hello folks,

i tested a new stepper ordered from a website (wwwonlinesteppers.com , its china i think). i was a sucker at their pricing (and i need some low budget steppers :p )

so just to share some info ...

so this little NEMA23 costs about USD21, 400steps/rev. rated @ 0.9Nm torque (not huge), 12v @ 0.38A on paper, operated @ 0.5A 22v (Vmot). using an old cheapo (china) A4983. the 1/16 stepping tests looks not bad at all. however, same strange reason that happened to my other sanyo stepper, the A4988 runs but has miss steps.

[youtu.be]

it looks lke visually, this stepper has a far more even stepping than the sanyo. theoretically, to compare both my other sanyo and this unit, method of operation and theoretical comparison. it might be possible for drivers to achieve better microstepping ... if you change the Vsense resistor to suit whatever is being operated at.

eg ... swapping 0.05ohms to say --> 0.1 --> 0.15 --> 0.2 --> 0.27 --> 0.3 --> 0.33 etc ... limited by the tiny SMD power dissipation envelop.

any 1 tried swapping that Vsense?

oh and pls do not use this for repraps, IT IS VERY SLOW, at its intended torque handling capability. when at high speeds, the torque level is way low, giving way to friction very easily. unless maybe ... extruder motor? or maybe direct Z threaded rods?
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Help me control a stepper motor pleaaase (3 replies)

March 13, 2013, 10:39 am
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Hi,

I've designed a product and I need to build a prototype which includes a stepper motor that mimics the control knob/jogwheel/encoder/dial movements 1 to 1 or close to 1 to 1. So when you turn the control knob/jogwheel/encoder/dial, the motor copies in both directions. The video below demonstrates the kind of control I'm looking for and being obsessed with this, I tried contacting the person behind the video but had no reply. I even offered to buy it from him.

[www.youtube.com]

I've looking into drivers and existing circuit boards but cant find one that has kind of control. I've seen how to do it with an arduino but dont want to use it or any pc device. The closest I found is in the link below. Its perfect but is a bit jumpy and I've been trying to get my head around why that is and how stepper motors work. My limited knowledge tells me that its jumping in full steps and that other controllers can work in half steps and even less making them smoother.

Simple manual control of stepper motors without a PIC or PC

Its looking like I might have to combine the right encoder to the right controller board and thats where I hit a brick wall. I have only a small knowledge of electrics and am struggling to work out a solution.

I would really appreciate any feedback and help.

Voltage wise, it could be between 5 and 24
Stepper motor wise, what ever works really.

Thanks for your time.

Ben
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can this be done (3 replies)

March 13, 2013, 3:41 am
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just a thought i put this in here due to the stepper on the extruder i want to be able to change the rolls what the wire does im no good with electronics but for instance say i wanted to do some light engraving i could take my print head of and swap it for a small rotary tool well a stripped down rotary tool in a modified head to make it interchangeable for instance like a laptop battery for example you have contacts on the battery and the laptop when they touch power can flow, so for instance on the interchangeable head and the extruder would have contacts on each and on the x carriage plate
so with the right software and hardware was combined to do this my be light milling and learning positions so, you could engrave your printed work dependant on height using bed jigs.
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Is a NEMA 17 stepper motor enough for 3D Printer? (2 replies)

March 12, 2013, 9:13 pm
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What do you guys use for 3D Printer?
NEMA 17 stepper motor
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(:P) MOAR stepper motor experiments (no replies)

March 12, 2013, 9:20 pm
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... imagine i am a kid playing with LEGO the first time ... and stepper motors just become my new bricks !
[3roomlabs.blogspot.sg]

pls turn down your volume when watching the vids. the high frequency parts can be very annoying (:P)
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