Closed Loop steppers

[funkmonkey]

Ok, so is any better than others as there seems to be a lot about?

Also the software side, we use Machine Strat, Delcam & Bobcad here. Do the drivers need specific headers in the G-code text to run?

[funkmonkey]

Just Looking through a box of old motors I have here at work,

There are three with the following detail

1.8 degree step, Holding Torque 550mNm

2 VDC 2.8A

Are these any good? Noticed that you put down a torque of 3Nm so what is mNm?

[Gary]

3nm is 300mnm just like 300mnm is 30 ncm.
5.5Nm is a reasonable amount of holding torque and if you use the existing belt they should give you enough torque to run the machine, but you need to define what you are using it for to determine how much power you need.

Just Looking through a box of old motors I have here at work,

There are three with the following detail

1.8 degree step, Holding Torque 550mNm

2 VDC 2.8A

Are these any good? Noticed that you put down a torque of 3Nm so what is mNm?

[funkmonkey]

I want to build a router out of it, mostly for machining wood, but would like the ability to do the odd ally job too.

[funkmonkey]

why, what wrong with it?

[funkmonkey]

Maybe so but it’s a lot better than some of the tat I have seen floating around, thats for sure. I don’t need a massively robust machine, I own an aerospace tool room with many CNC machines, I just need this machine to help my dad who sits at a desk making 100's of wooden miniatures by hand, as his part time business. Just wanted to help him out a bit.

[Gary]

You wont be able to accurately do anything with ali, it will flex way too much.

reducing the height will help with the ridgidity.
I think that you could use it for routing wood and plastics but that is about it, but don’t expect too much.

You may also have a bit of hysteresis due to the belts if you try and move to quick.

[funkmonkey]

cos its what I wanted to do.........

[Gary]

Normally stepper drivers are totally dumb and only react to clock and direction.
So as long as you can get your software to generate clock and direction the driver should work fine.

Ok, so is any better than others as there seems to be a lot about?

Also the software side, we use Machine Strat, Delcam & Bobcad here. Do the drivers need specific headers in the G-code text to run?

[funkmonkey]

these drivers sound a little like me!!:dance: