specs for old MBI steppers

[Whosawhatsis]

I'm looking to upgrade the motors on my Cupcake, and I'm looking for specifications so that I can compare because I suspect that these motors are very poorly suited to be used with modern microstepping drivers at 12V, and possibly even poorly suited to the original gen3 half-stepping drivers. The old pre-moons steppers are no longer listed on the store, and the only marking I see on the one I have already removed is "Makerbot   50002". IIRC the other two have sequential numbers (50001 and 50003, maybe) which would make them serial numbers rather than model numbers. My bot is a very late model "Ultimate" cupcake, batch XVI, if that makes a difference.

What I'm looking for is a datasheet or similar data on the specifications for the stepper motors it came with. I'm particularly interested in the rated holding torque and rated voltage, though I can calculate voltage from rated current and phase resistance if the voltage rating isn't available, but I'd like as much information as I can get.

[Aaron Double]

Here you go.

Aaron

[Whosawhatsis]

Awesome, thanks.

It's worse than I thought, these motors were a terrible choice. No wonder I have to crank the current so high to get any torque out of them! New motors it is!

On Monday, June 11, 2012 at 9:10 AM, Aaron Double wrote:

Here you go.

Aaron

On Jun 11, 2012, at 12:08 PM, Whosawhatsis wrote:

I'm looking to upgrade the motors on my Cupcake, and I'm looking for specifications so that I can compare because I suspect that these motors are very poorly suited to be used with modern microstepping drivers at 12V, and possibly even poorly suited to the original gen3 half-stepping drivers. The old pre-moons steppers are no longer listed on the store, and the only marking I see on the one I have already removed is "Makerbot 50002". IIRC the other two have sequential numbers (50001 and 50003, maybe) which would make them serial numbers rather than model numbers. My bot is a very late model "Ultimate" cupcake, batch XVI, if that makes a difference.

What I'm looking for is a datasheet or similar data on the specifications for the stepper motors it came with. I'm particularly interested in the rated holding torque and rated voltage, though I can calculate voltage from rated current and phase resistance if the voltage rating isn't available, but I'd like as much information as I can get.

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Attachments:

- kysan-1123029.pdf

[Dan Newman]

On 11 Jun 2012 , at 9:22 AM, Whosawhatsis wrote:

> Awesome, thanks.
>
> It's worse than I thought, these motors were a terrible choice.

35 Ohms…. Yup.

> No wonder I have to crank the current so high to get any torque out of them! New motors it is!

The tightest spot is getting the clearance of the X-axis stepper motor. (You
could of course make a new Y-carriage.) FWIW, Tom Lombardi reported back in April
that he had upgraded his ToM to Kysan's 42BYGH101B and reported it a close but functioning
fit for the ToM's X-axis. Here's the link to Tom's posting,

http://wiki.makerbot.com/forum/t-456728/tom-stepper-motors

Note that he's using Pololu stepper drivers. Not too sure how well the
MBI stepper driver would work with them and their much lower winding
resistance. (The lower winding resistance is a good thing.) Those Kysan's
have a 1.5 Ohms winding resistance. I recall some Ultimaker folks using
Kysan 42BYGH4803 which are a taller stepper.

Dan

[Aaron Double]

Shout when you find some steppers that have the same depth at those. I would love to replace mine but the Y on the lowrider is quite tight.

Aaron

[Whosawhatsis]

I'm running the lowrider too. I might try the newer Moons stepper (I have one from my Mk7, which I assembled with a larger motor), but I've also got a slightly smaller 400-step motor with 8.4 ohms/phase (or 4.2 depending on how I wire it, because it's a 6-wire) that I might try. Don't remember where I got it, but it's a ST4209S1006, and I don't think I paid as much as any of the prices I see listed for it when I search…

Also note that if you change your steppers, you'll need new pulleys, because the old makerbot motors have a 4.78mm shaft instead of the standard 5mm.

[Jack Coats]

http://www.daycounter.com/Calculators/Stepper-Motor-Calculator.phtml

has a reasonable calculator.

The ohm's law calculation gets partly thrown out the window because you
are dealing with coils. Most steppers can take comparatively high voltage
IF it is for properly short duration and the amperage per coil is held down
so the coils aren't allowed to burn up. (I ruined several motors, not believing
the 'experts').

Voltage will help make the stepper response more 'crisp', while the amps
are what makes it 'hold' (yes, over simplification, but that is me a
simple thinker :)