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[QUOTE=diycnc;118473]
I painted the frame too, blue Hammerite spray paint, and the paint is so soft I can scratch it off with my fingernail! I clearly didn't do a very good job of cleaning it before...

Use the one that allows the shortest belt arrangement. They will all work equally well as each other but shorter belts are easier to find and implement.

This is my preferred setup.

27732

Yea, for this application back to back is what you want.

If it were me I'd run the enable, pulse and dir. signals as twisted pairs - common the -ve ends up at the Arduino. This approach gives much cleaner waveforms and better resistance to interference.

Yep.

5A would work better. Gives some safety to drives but won't trip when motrs are being worked hard.



These are what I use, cheap and easy to wire and change.
...

There is absolutely no difference. I've built loads machines using both and see no performance or reliability differences between AC or DC.
The AC is simpler for obvious reasons so my suggestion is...

This is quite a good introduction...
http://www.skillbank.co.uk/psu/

The stepper driver must be rectifying the AC into DC anyway, though with little or no smoothing. My guess is that making...

It’s a marble plate from our old fire surround. I checked it against other ground surfaces and it is pretty flat at least down to 0.05 mm. Also a ground block placed on it starts to wring together...

My first ever machine had 4 posts like that and it took a while to get them all the same length. I didn't have a lathe back then. If they are out a bit the motor will be skewed and the belt won't...

Check out Joe's excellent vid.
https://www.youtube.com/watch?v=4OoQQg76ar4&list=PL1FIADAKba_tiLqXbUkzD30sZjtp_VyqY

here is a shopping list from Rapidonline https://www.rapidonline.com/

I...