I'm trying to build my own cnc so... i need a little help...

[zet-jaro]

ok, sturmer and me want to build a cnc machine so we need you to ask you some questions... that cnc has to have working dimensions of A4 paper...


so...
1. can this be helpfull? keys are just that you can better see size... we have 2 of those...



2. what about this? also have 2 of those but only last few letters are diferent (on this motor they are TB9X31F) - 5 wires



3. can this be modified? also 2 of those... originally for 3 motors



4. can this be of any help? also 5 wires and also 2 of those



anyway, those parts are from hp 610 and hp 650 both desk jet....

tnx for any help....

Sturmer & zet-jaro

[zoltan]

Hi,

I started like you. I collected old/broken printers from everywhere. The motors as I can see in the pic are too small and they are 7.5 degrees step, not great for resolution. You must look for printers like HP Laserjet series I/II/III or any OLD and big printer. There you find motors of 0.65-1 Nm.

Regarding the board I can not comment. It is SMT which means...difficult to salvage parts. Again, look for old printers....Usually, they have SLA series IC, which myself I did use yet, despite the fact I have a bunch of, but in some printers I found out also L297/L298. For driver and interface go to Phil's site and chose.. I started with discrete unipolar. It was useful just for learning. It has poor performance comparing with L297/L298 or A3977 you can find there, but it is cheap and easy to build, and it moves the machine. You can work with it.

Zoltan

[zet-jaro]

Man, tnx for your help!

Does all 3 printers have to be the same?
We are from Croatia so is there any store on this area for electronics? i got some kind of reductor which goes between that thing on first pic and step-motor on fourth pic...

[Jason Marsha]

Try photo-copier repair shops or photo-copier agents. They usually dump the old photo-copiers without salvaging any parts. With some luck you can get decent steppers, much larger than the ones pictured as well as 608 series (skate) bearings and stainless steel slides.

Jason

[Jason Marsha]

I forgot to add, avoid 5 phase steppers .

Jason

[zet-jaro]

tnx man!

what abot electronic? any shops near Croatia?

[lucas]

Aren't there any electronics shops over there or do you want complete driver boards?

The PM55 motor should be able to move something if chopper driven and directly coupled to 8 or 10mm threaded rod.
10mm has 1.5mm move per turn, at 48 steps: 0.03125 mm/step.
That "something" can't be much, it won't work for a router. Might be just enough for the Z to lift the spindle if it's a light one

Most important: what kind of machine is it: what spindle and materials?

A4 size is small, you could use the carriage guides from the printers and use these for the Y and/or Z. Have a look at the drawer slide thread, I posted some pictures for this.

[zet-jaro]

we would like to buy electronic kit wich includes board for handling steppers with all elements...

i have some kind of table-drill for a start...

[lucas]

Looks like you misunderstood the important question.

What do you want to do with the machine?
Only drilling, milling wood or aluminium?

This will define the kind of spindle and stepper power you need.

Once this is known then you can go ahead and select motors, electronics etc..

[zet-jaro]

well... milling wood and aluminium if possible....

[lucas]

In that case you won't be able to use any of the parts you have, not strong enough.
I'd suggest you have a good look at several machines discussed in the wood and metalworking area to get an idea.

[Sturmer]

zet jaro is a little bit wrong...the wood he was talking was balsa....this was primerly my little project for cutting parts of airplane models...but...The photocopier machine idea is great! there are big stepers...and pretty big slides...hm...the steppers and the construction is the simple part of the build...we need some kind of driver board...so we culd cut balsa...or grave on wood....and when this thing works fine...then we will try some thing to cut aluminium.....