Hi Keteland,
What kind of limit switch do you use (opener or closer)?

 

The most Nema 23 Motors, what I know, Need 12V (Example: Open Build Part store). Have you really 48V Nema Motors?
The Problem what I see is the current (amperage). The Ramps 1.4 can control Motors up to 1,5 A (good for Nema 17), but Nema 23 Motors Need 2,8 A.

You can adjust the amperage on your Ramps 1.4 with the Potentiometers. When you give full Ampere Power, may be the Motors move!??

The Picture Show the small Potentiometer:

 

Hey Creation, higher voltage allows for higher top speed / more torque of the steppers ( Induces some problems aswell though ) What u need overall depends on the application but i would go for the higher end of the rating.

"Gecko recommends running the motor from 4 times (minimum) to 25 times (maximum) the rated voltage"

Gecko is one of the biggest manufacturers for stepper drivers.

That would amount to about 48V for these small 2,8V rated Nema 23s

Running these large motors with the tiny stepsticks isnt a good idea i think, theyll get really hot after a short while and either power off or burn ( depends on the safety mechanisms in place )

Concerning the Open Builds Steppers, they are rated at 3V so if ure actually driving them with 12V ure far off for the holding torque / rpms they can actually output and just scraping the bottom of their capabilities.

Thing is i think for 60V u clearly need external drivers from gecko / Leadshine etc obviously everyone tries to avoid the cost that comes with these

PS. A very observant reader might call me out on the holding torque statement because that isnt influenced to much by the input voltage, but in a real world application before u attain the holding torque ull obviously need to slow down the steppers to a full halt. The power of this slowdown to a halt is on the other hand highly influenced by the input voltage and is important for a 3D printing application.

 

Hi lenne0815,
sorry for my late replay - I´m very busy last time.

Thanks for your information about that a" higher voltage allows higher top speed". That can be interesting for future project.
The electric field is not one of my strengths, so I'm glad to learn something about it.

What do you mean about a CNC Combo Machines and the best use voltage (12 or 48V)?
I like CNC Combo - Machines (3D Print, Laser, Mill .... what ever).
Here my current project:



The operation voltage is 12V, because for the Mill I need some Power.
The other application lose some speed, but for a Combo Machine is it ok.

Is that a good choice , or is it better to use 48V?

 

Very nice looking machine !

Where did u get all the sheet metal work done ?

What kind of stepper drivers are you using right now ?
What pitch are your ballscrews ?
Whats the highest rpm you can drive your stepper motors right now under load ?

Actually for your build theres another problem, if you build it with classic trapezoidal spindles theres only so much speed you can get before the nuts overheat / the spindles start to wobble.

In general its diffcult to build all in one machines because you always end up with tradeoffs- 3D Printing and laser engraving ( even more so ) are very high speed applications, whereas routing speed highly depends on chip load / torque of your router / stepper torque / machine rigidity and is usually a lot lower.

 

Q1: A friend work on a laser machine, he produce the alu metal plates for me.

Q2: I use the BAM & Dice Board, based on Arduino 2560.
Link: BAM Shield mit Arduino und vier mal DICE-STK - 2PrintBeta - 3D-Drucker, Entwicklung, Prototypen

Q3: I use a trapezoidal spindles TR 12x6.

Q4: The highest move is 3000 mm/min (without load - position speed) and for milling (work) moves 450 - 500 mm/min.
You have right, the spindles begin to wobble by 3000 mm/min. So it is better to move max. 2000 - 2500 mm/min.
But for me (Home milling machine) is the speed enough.
Only the 3D printing part is slow - 12mm/min, but I dont print so much und so it´s good to have this option.

Q5: It is true, that it is difficult to build a all in one machine. In the first line it is a milling machine and for all other options that I can integrate, I don't need another machines.
So, one machine need less place and saves money, but I know, that is not possible to get a all in one high end machine.

 

I buy it from Ebay (China)
Link: 2.8W Laser Head Engraving Diode 450nm Black Red Blue DIY Lead Parts Machine Tube

Don't forget the safety glasses!

 

Its a shame you didn't try DRV8825 drivers before buying new steppers, I couldn't run my NEMA 23's from the A4988's either.

 

Any word or discussion on what you ended up using for the printer bed? I've got a maximus inspired build I'm working on and really unsure on how to move forward with the print bed.