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Small stepper motors

Hello LMR,

I need to get two motors which I can control precisely, like in a CNC.

I've been looking for small stepper motors and found these, which Pololu sells:

http://www.pololu.com/catalog/product/1204

They seem to be good but I'm not sure about their speed (I've read somewhere that the are low speed and I would prefer fast motors).

 

So, what do you say, should I try these guys or do you know any better option?

 

EDIT:

This is the machine I'm building:

My idea is to use those steppers instead of the following motors:

PS: This is the first time I'll be using this kind of motors :)

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Here are some cheap stepper motors that come with driver boards for $4.75

These motors/drivers are made by the millions for A/C units, fans, duct controls etc. which is why they are so inexpensive.

http://arduino-direct.com/sunshop/index.php?l=product_detail&p=126

More about these motors and example Arduino code here: http://arduino-info.wikispaces.com/SmallSteppers

DISCLAIMER: Mentioned stuff from my own shop...

 

I don't imagine I will be needing them ever, but, most microcontrollers are short on pins to begin with. Do you sell the steppers by themselves or have you thought of using a dual h-bridge chip rather than the darlington array that is offered as a driver?

It seems to me that you are building some sort of XY-table and I don’t think the speed of the stepper should be any problem. As you can see from the video you can get quit a good speed from a stepper, more than you probably need in your setup. http://www.youtube.com/watch?v=8cxl3B99MQQ&feature=related
From your picture it looks like your running this on a Motorino board? And I don’t think you can run two steppers from the onboard L293D.

The speed isn't a problem, but if I could choose I would prefer a faster one :)

Yes it is a Motoruino, from what I know, a L293D only can run one stepper (http://www.seattlerobotics.org/encoder/may98/steppers.html). I'll problably mound two L293D and a basic arduino on a prefboard for this project.

to get more speed from the steppers people usually use more voltage.

i have 3 tiny stepper motors that i don't need. check the pic. if u feel you can use them i can see if i can mail them to you :D

they are quite fast and powerful.

They look good :)

What's their diameter? 3cm?

i will dig them out later and give them a measure :)

give us a better idea of your impression of fast and slow, maybe how much torque you need, and how much control you feel you need. I have some ideas, but, I would rather offer one well thought out idea rather than a batch of half baked ones. :)

Sorry for the lack of information.

I've updated the post.

I have no idea of numbers, but if they have +- the same speed and torque of the ones I'm currently using (simple DC motors scavenged from old toys) it would be OK.