Quantcast
Channel: Reprap Forum - Stepper Motors, Servo Motors, DC Motors
Viewing all 2228 articles
Browse latest View live
↧

Re: How to identify specs of working motor

May 7, 2013, 10:40 pm
$
0
0
... with a scope you'll be able to see the 'chopping' parameters and rise/fall of the voltage, but normally it's simply a matter of max. voltage the drivers will suffer and max. possible current, until the coils overheats.

Common bipolar stepper drivers output a short peak of their max. voltage and then regulate the current to the settings defined by a trimpot or discrete resistor-values ...
↧
Search

Re: How to identify specs of working motor

May 8, 2013, 2:20 am
$
0
0
Thanks, Viktor. I do have a scope. Maybe it's time I hooked it up.

I guess beforehand I should disconnect the motor and determine which of the four leads are pairs by looking for non-infinite resistance between them, right?
↧
↧

Re: Cheap unipolar NEMA 17 motors in Québec

May 10, 2013, 9:27 am
$
0
0
I actually bought 5 Japan servo co. NEMA17 steppers for my build. They are KH42JM2B-140G. They say on them DC5. 16V 1.2A 1.8degree /step. After getting the printer fired up, everything seems to work, however I'm just not so sure how fast everything is supposed to move. I'm using an ATX 300w psu, only connected the 5A 12v to my RAMPS.

The motors do get pretty warm only after maybe 5min of testing in pronterface. Should I be worried that these are 16v steppers? Anyone know if there's a way to compensate? After actually finishing my reprap I read its recommended to use 3.5v steppers. Of rather not buy new steppers right now maybe later on when I get some cash flow, but for now I hope I can use these.
↧

Testing stepper motors

May 13, 2013, 4:20 pm
$
0
0
I am currently in the middle of building my own design delta printer - closer to a Kossel than to a Rostock. I don't yet have the electronics - I'm not sure which direction I'm going - but I wanted to test the stepper motors I recently installed.

I have an adafruit motorshield for my arduino uno, so I connected the motor to it, connected a 12 volt power supply to the motor power supply, removed the jumper from the board, and proceeded to load and try the sample sketch that adafruit provides. I got SOME movement from the motors, but before anything substantial could happen, there was a big puff of smoke from the motor shield. I quickly disconnected everything.

I'm wondering 1) what I could have done wrong, and 2) did I damage my motor. According to the Lulzbot web site, the motor is rated at 2.8 volts. I'm not sure what the adafruit board puts out, but I was supplying 12 volts to it. I though I heard of people running their steppers at up to 24 volts, so I thought I'd be safe.

I guess it's possible that I hooked the motor up wrong. An on-line spec sheet indicated that green/black was one coil and red/blue was the other. I hooked them up in the order black, green, nc, blue, red as I was looking at the adafruit board.

Any assistance would be greatly appreciated.
↧

Nema 17 not beefy enough need help with driver selection

May 13, 2013, 5:32 pm
$
0
0
Hi I am reengineering my 3D printer around a very sturdy Z axis assembly I found surplus.

I don't think my Nema 17 motor is enough to do the job anymore but looking at specs it seems the drivers on my Azteeg X3 don't handle loads bigger than what most nema 17 put out.

I know from the Azteeg X3 manufacturer that I can remove a driver chip and tap into the pins so I can use an external driver board, but I don't know what boards to get. Most vendors I am familiar with will sell larger steppers but the driver boards they sell only go up to 2A.

Do you guys have any recommendations. I will need a torquey nema 23 or possibly one larger.
The assembly I found runs on a high end BEI dc motor with encoder and has a 3/8 output shaft. (Im still waiting for the manufacturer to give me specs on it) it looks like it was designed to carry a bit more load than what I will be putting on it.... Ill attach pics...


↧
↧

Re: Testing stepper motors

May 14, 2013, 5:19 am
$
0
0
Quote

I guess it's possible that I hooked the motor up wrong.

This might result in not turning motors, but definitely not in smoking stepper drivers. Does this stepper driver feature current control? Is it for bipolar motors? Links to the actual items you use are always helpful.
↧

Re: Testing stepper motors

May 14, 2013, 6:31 am
$
0
0
Thanks for responding.

Here is a link to the arduino shield: Adafruit Motor shield

and here is a link to the instructions I followed: Using the motor shield. Down at the bottom of the page are the instructions for a stepper, including the literal sketch I was testing with.

and finally - here is the motor:Lulzbot stepper

Any help would be appreciated.
↧

So i took apart this copier...

May 16, 2013, 9:08 pm
$
0
0
I have a job that gives me access to a bunch of big copiers that will eventually be thrown away. Today I got to pull one apart and grab some parts. I found 6 nema 17 motors, a pile of gears, belts, solenoids and maybe even a frame for my (eventual) 3D machine.

I'm curious about a few of the motors.
Here they are:
(Sorry its hard to tell when the focus is off from a phone)


I know it's blurry. Here's a list of part numbers from top left to bottom right:

STP-43D1052
17PM-J343-P5VS
17PM-J343-P4VS
STP-43D1053
STP-43D1052
17PM-J212-G3VS

I found data for the Minebea motors and I think they will work. I'm not sure about the digits on the end of those but I'm assuming those have something to do with the gears on the motor shafts. The smallest has a brass gear with angled teeth :D

I'm having a hard time finding anything on the other 3 (the STP models).

Anyone have any ideas what the other 3 motors are? My arduino mega should be here tomorrow. Then I can figure out if I can re-use the driver boards or power supply. Should be a fun weekend :)

Has anybody worked with copier parts?
↧
Search

CNC TB6560 can be used in the the 3D printer Machine?

May 16, 2013, 9:09 pm
↧
↧

Re: So i took apart this copier...

May 16, 2013, 10:56 pm
$
0
0
... they look all like common hybrid 200s/r steppers - with 6 wires you can wire them either uni- or bipolar, with 4 wires it's bipolar.

I've scrapped some old copiers in the 90-ieth, but then steppers weren't used there, mostly 'beefy' DC-motors and sprocket-chains ;)
↧

how to control stepper motor

May 17, 2013, 3:43 am
$
0
0
Hello
can One controler a stepper motor nema 17 (http://www.phidgets.com/products.php?product_id=3318)
with
-power supply 12V 5A (http://www.ebay.fr/itm/Adaptateur-secteur-alimentation-LED-AC-DC-220V-12V-5A-5-5mm-/220916891047?pt=FR_YO_MaisonJardin_Bricolage_InstallationElectrique&hash=item336fac3da7#ht_1866wt_1031)
-a voltage regulator (LM2596 Power step-down Modulates DC 4.0~40 à
1.3-37V Adjustable + LED Voltmeter) - [www.ebay.com]


thanks
↧

Re: CNC TB6560 can be used in the the 3D printer Machine?

May 17, 2013, 9:47 am
$
0
0
They can generally be made to work but the fact that it is using a parallel port to communicate means you will need to use one of the CNC software suites like Mach3 rather than repetier, printrun, etc. There are some people doing it but you'll find more people around that know the arduino toolchain. So, yes it can be done, but you are likely to need to learn a lot of configuration on your own to get it to work. With RAMPS, Sanguinololu, Gen7 etc. the software, firmware and stuff is already set up for 3D printers.

Sanguinololu, or Gen7 could probably be built for around $35 if you are carefull where you source components, and Pololu drivers would be another $40 or so. So total cost is around $75 if you build it yourself. You can get pre-built Sanguinololu boards with drivers for about $100 on ebay.

I'm selling beta boards of the Sanguish electronics. It is similar to Sanguinololu and Gen7 but uses TB6560 drivers to get the cost down. Beta boards are $40 plus shipping. PM me if you are interested.
↧

Re: Controlling MDrive 23 ( schneider elect ) with Python....

May 21, 2013, 1:44 pm
$
0
0
Hey guys I'm back...

I've been making progress with my python control module, but I'm really stuck on something...

Using PySerial I cannot send commands which change a motor variable like the micro step increment.

Using screen connected to /dev/ttyUSB0 I can send commands like:
>MS=5

and that works...with PySerial I send the same command with \r\n and I get an error, "illegal data entered".

I'm pretty stuck again...
↧
↧

Re: Controlling MDrive 23 ( schneider elect ) with Python....

May 21, 2013, 2:33 pm
$
0
0
got it.....the equals sign was throwing it off...once i substituted the ascii code \075 the command worked.
↧

Re: Controlling MDrive 23 ( schneider elect ) with Python....

May 21, 2013, 4:17 pm
$
0
0
hmm....there's still something going on with the communication protocols that I don't understand.

screen in linux works flawlessly....I can set and change the mcode variables over and over with no problem.

With PySerial, I can only send one assignment command, such as:
>DN="X"

If I try to assign another value to the device name, I get an error.... Even if I try to assign a value
to a different variable, I get an error. It's as if I'm locked out after one modification of the RAM.

I'm still quite stuck... :(
TIA,
wbg
↧
Search

This 12V motor is too hot...

May 23, 2013, 12:30 pm
$
0
0
Greetings fellow Reprapers!

I want to ask you for advice regarding setting properly the Vref for my extremely hot stepper motors.

But first some details to know what is the setup.
- Reprap Prusa Mendel
- Gen.7 1.5.1 electronics (thanks Traumflug!)
- Pololu drivers
And most importantly:
5 exact stepper NEMA17 motors:
- degrees per step: 1.8
- voltage: 12 V
- peak current: 0.5 A
- resistance: 25 ohm
- inductance: 46 mH
- static torque: 4.4
- 4 wires

Right now I know that high voltage motors are not recommended, but the time I bought them I was even less experienced than now ;)

Anyway, following the Reprap- Sanguinololu setup instructions,( [reprap.org] ) I calculated the Vref for my motors to be:
Vref = 0.14V.

Then carefully I set them on the Pololu's, and started other calibrations. But after a while of printing I found out that the working motors are heating quite much (I can not measure the temperature, but its hard to keep a finger on them). I suppose this is because of too high current going through the motors. At the same time, I am not sure in which way to change the Vref on the Pololus not to screw up the whole printer.

I would really appreciate any suggestions, directions, well, any help!
Best,
Paweł
↧

Re: This 12V motor is too hot...

May 23, 2013, 1:45 pm
$
0
0
... add coolers to the motors and/or reduce the current slightly ...
↧
↧

Re: Controlling MDrive 23 ( schneider elect ) with Python....

May 24, 2013, 2:18 am
$
0
0
By trial and error my lab partner and I noticed a pattern in the failures and it seems as if the
position of the cursor needs to be associated with the prompt, '>' .

Adding an addition CR to the write to variable string fixed it up.

wbg
↧

Re: Testing stepper motors

May 25, 2013, 2:55 pm
$
0
0
jbernardis Wrote:
-------------------------------------------------------
> I'm wondering 1) what I could have done wrong, and
> 2) did I damage my motor. According to the
> Lulzbot web site, the motor is rated at 2.8 volts.
> I'm not sure what the adafruit board puts out,
> but I was supplying 12 volts to it. I though I
> heard of people running their steppers at up to 24
> volts, so I thought I'd be safe.

You can do that with latest Allegro chips etc because they are advanced chopper drivers with current control. The L293 are simple old school half-H type drivers, so you need to match supply voltage to motor voltage.

The motor is probably ok, the driver should have smoked before it could pass significant current through it.
↧

stepper motor NEMA 17 speed

May 28, 2013, 6:01 am
$
0
0
Hello,
I'm building my own 3D printer and I bought a NEMA 17 stepper motor for the extruder part. I'd like to know wich is the ideal speed (in rpm) to extrude correctly and if this speed is costant during all the extrusion process.
Also, I'm using Slic3r to generate the G-code and I was wondering if the value of "E" is related to the Nema speed.

Thank you
↧
Viewing all 2228 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>