New Introduction

**irving2008** · 27-08-2010

Hi Tony and welcome.

Dont wish to dampen your enthusiasm but have you got any thoughts about the size/capability of the machine you are going to build? The unipolar drivers you mention are fine for a very small machine, maybe thats what you want for jewellery, but will quickly run out of capability for anything larger...

**craftcadet** · 27-08-2010

Originally Posted by irving2008

Hi Tony and welcome.

Dont wish to dampen your enthusiasm but have you got any thoughts about the size/capability of the machine you are going to build? The unipolar drivers you mention are fine for a very small machine, maybe thats what you want for jewellery, but will quickly run out of capability for anything larger...

Thanks fo the welcome

I have been reading though the forum and am beginning to realise that i may be going down the many roads that lead to dead ends that many others and stumbled upon. Ok thankfully I have not as yet built the machine so can start smaller. Here is what i intended to build :-

Mill for Wood and aluminum

X axis = 600mm
y axis = 600mm
z axis = 300mm

I have bought these motors Astrosyn MY103H702 (they are in the post I hope). I read you have a set and were going to test them, did you get round to it? I was going to post a question about them on the original thread. I need to figure out the power supply for them, can you help?

so that is the basic outline. My hobby budget is very limited and I am happy to change my plans just get my teeth into cnc.

Too big an idea for my driver? could you suggest axis dimensions?

Thanks for your interest and knowledge

Tony

**irving2008** · 27-08-2010

Tony,

The Astrosyn steppers are OK and fine for a small router for wood, pcb, plastic but you might struggle with aluminium. You won't get more than 0.8Nm and 300rpm out of them on a unipolar driver. The size you have suggested is possible, will depend on the design. The power supply will depend on your driver... but you probably dont want to go above 12v. Depends on the current limit resistor (light bulb) you've used...

**craftcadet** · 27-08-2010

Few! thanks Irving thats a relief.

I'm thinking of using a reclaimed PC power supply so 12V with a possible 3A should be ok. I need to work out the current limit resistor (light bulb) combintation with a bit of testing when the motors get here.