4 AXIS BUILD

[Merchi]

Hi

I have almost finished my cnc build and I would like to buy the electronic components.

My build measures:

- X axis 1200mm
- Y axis 800mm
- Z axis around 400mm

Everything is made in aluminium and steel, and it is moved onto HIWIN 25 linear rails and by 25mm thk ballscrews. The heaviest axis is X (around 100Kg), so I would like you to recomend the hole kit for 4 axis.

I am completly lost in this way, but I prefer to spend much more money to make 100% sure that all the electrical components are able to move my machine with no dificulty

I would like to point that I would like to have an emergency button, limit switches, microsteping in the drivers....almost all that is available and necessary to make my machine work perfect and 100% save

I have already look in hundreds web pages like keling, CNC4PC, PMDX...and I am almost getting crazy !

Just feel completly FREE TO RECOMEND, all advices are welcome

Thanks for reading

Eric,

[Simon C]

Hi Eric,

If you could post some pics of your machine it will give people a better idea of the requirements your machine electronics will need. You say your ballscrews are 25mm Dia but what pitch are they? also a 25 mm dia ballscrew with a length of 1200mm will have alot of rotational mass, so the biggger the pitch the slower they will need to rotate which is a good thing on a ballscrew that size. also 100kg is alot of mass to move, Im building a router/plasma table at the moment with 900mm movement in the X axis and 800mm in the Y, the main structure is aluminium extrusion with 15mm Hywin rails on the Y and 20mm Hywin rails on the X and uses rack and pinnion drive and my Y axis moveing gantry only weighs 12kg (without the spindle). Il be useing a 3Nm (425oz-in) stepper motor on the X and Y, and a 1.85Nm (280oz-in) stepper on the Z, all will be nema23 size. As i said some pics of your machine would help alot in figureing out what motors you need.

Regards,
Simon

[asuratman]

Hello,
Show us your picture.

[Merchi]

Hi Eric,

If you could post some pics of your machine it will give people a better idea of the requirements your machine electronics will need. You say your ballscrews are 25mm Dia but what pitch are they? also a 25 mm dia ballscrew with a length of 1200mm will have alot of rotational mass, so the biggger the pitch the slower they will need to rotate which is a good thing on a ballscrew that size. also 100kg is alot of mass to move, Im building a router/plasma table at the moment with 900mm movement in the X axis and 800mm in the Y, the main structure is aluminium extrusion with 15mm Hywin rails on the Y and 20mm Hywin rails on the X and uses rack and pinnion drive and my Y axis moveing gantry only weighs 12kg (without the spindle). Il be useing a 3Nm (425oz-in) stepper motor on the X and Y, and a 1.85Nm (280oz-in) stepper on the Z, all will be nema23 size. As i said some pics of your machine would help alot in figureing out what motors you need.

Regards,
Simon

Ok, I will post some pictures for you to see the machine, but I cant take them until saturday because it is in my friends garage

For the moment I have been speaking with the people of PMDX (really helpfull people in every way) and the suggest me the following:

PMDX 126 Break out board
PMDX 134 for fast and easy conection of the drivers
Gecko G203V for each axis
Then the basics : emergency button, proximity sensors, cables...

For the motors and power suply I have though about kelingc. I am thinking of 1200oz nema 34 motors or 1800oz ones.
The last ones I think that are too much and that with 1200oz ones will be enough, but the thing is that my friend is building the mechanical part and he is really afraid that the friction with those hiwin, plus the weight of the Y and Z axis will be dificult for a 1200oz motor to move.
Otherwise I hope that for this weekend he will have all the frame mounted and I can show you some pictures and measure with a dinamometer the strengh needed to move those axis

Really thanks for coments !

[Simon C]

After i read your first post i was thinking you would need atleast 1000 oz-in so i definatley think your in the right area going with the 1200 - 1800 oz-in motors, i dont know how much diffrence there is in price bettween the 1200 and 1800 but i personaly would go with the 1800 if price was not an issue, its always better to have motors that are a little to big than a little to small. As for the break-out-board, i have never used that particular type but it looks like a realy nice board, and you can never go wrong useing Gecko drives, so i think all in all you are going in the right direction with that set up.


thease are a coupple of pics of the machine im building, its still not finished yet but hopefuly will be soon, waiting for parts is so annoying


regards
Simon

[mactec54]

Merchi
You could look at these AC servo motor drive package Dmm Technology, would not be much difference in price to the steppers you are looking at, There 900w would work for your machine

Motion Control Products - DMM Technology

[Merchi]

After i read your first post i was thinking you would need atleast 1000 oz-in so i definatley think your in the right area going with the 1200 - 1800 oz-in motors, i dont know how much diffrence there is in price bettween the 1200 and 1800 but i personaly would go with the 1800 if price was not an issue, its always better to have motors that are a little to big than a little to small. As for the break-out-board, i have never used that particular type but it looks like a realy nice board, and you can never go wrong useing Gecko drives, so i think all in all you are going in the right direction with that set up.


thease are a coupple of pics of the machine im building, its still not finished yet but hopefuly will be soon, waiting for parts is so annoying


regards
Simon

Really thanks for advices and beautiful machine !

Merchi
You could look at these AC servo motor drive package Dmm Technology, would not be much difference in price to the steppers you are looking at, There 900w would work for your machine

Motion Control Products - DMM Technology

Thanks for the link. I have considered the option of using servo motors because with the money I am going to spend I can consider both options. I would like to make one configuration with stepers and another with servos
The problem is that I have looked up at motors like fanuc, parker...and so many others that I have never make myself clear.

[UUU]

I have a PMDX 125 board on my machine and it's working very well. I'm running a VFD for the spindle motor and use the PMDX spindle board, which just mounts onto the main board and is working fine as well.

[Merchi]

Well, to be more speficic:

- Balscrews: 25mm THK (5mm pich)

- Total weight of Y+Z axis: 100-115 (with everything (linear rails, aluminium plates, squares, ballscrews..), including a 12kg spindle and 2 nema 34 of 5kg each )

I atached the pictures I promised

The profile you see lying on othe table is going to be the main structure where all the Y and Z axis will rest (I just pick it up in the bin of my factory and cut...)

[Merchi]

I have a PMDX 125 board on my machine and it's working very well. I'm running a VFD for the spindle motor and use the PMDX spindle board, which just mounts onto the main board and is working fine as well.

Thanks for opinion. PMDX suport are really very friendly and helpful, and their products seems to be good quality

I have just contaced cnc4pc (just to compare), and by chance they speak spanish. So, it may be a point to take in acount for further explanation. Because, although I understand written english perfectly, other more technical explanation may be more dificult to understand. I will post what they recomend when they email me.

Thanks to all!

[Simon C]

Hi Merchi

Your machine is looking great, and looks very strongly built, i bet you will beable to do some serious milling with it. just out of intrest what kind of spindle will you be useing? im still not decided what spindle to use on my machine.


Wish i could find a bin that has chunks of aluminium in it like that, lol



regards
Simon

[Merchi]

Hi Merchi

Your machine is looking great, and looks very strongly built, i bet you will beable to do some serious milling with it. just out of intrest what kind of spindle will you be useing? im still not decided what spindle to use on my machine.


Wish i could find a bin that has chunks of aluminium in it like that, lol



regards
Simon

Well, I hope it will be strong. I still have to add another 2 feet on the center and lot of squares and aluminium plates to make it vibrate a less as posible.

About the spindle, I havent though yet what I will be using....but they also throw lot of tool packs almost new, or just completely new, so I may "rescue" them from the rubish

And coming back to the topic, I am already speaking with cnc4 people, so If anyone wants to give me opinion about servo/stepper motors, it's welcome

Regards,
Eric