CNC building decision

[Dinius]

Hi, Im planning to build a "mid" size CNC machine for wood and aluminum milling.

I have attached some concept designs which I´ll be please to hear what do you think about them and which one you thing is the one I should develop.

Material Im planning to use:

- Aluminium profile Heavy 90x45 & Heavy 45x45
- Aluminium 270x19 Bed
- Hiwin 20 rails, whit HWG20 & HGH20 carriage
- CFU Ballscrew 20-05 (very similar to Hiwin, 0,02 difference). (Also its Flange housing and BK, FK, FF & BF bearing block)
- 12mm & 6mm laser cut steel plates
- Nanotec Nema 34 stepper motor
- Gecko G540 Driver

And thats about it

For the spindle Im still thinking about it, don't have it clear... And Im still missing the Power supply

Well, I know Im missing info, so please ask...

Thanks

[Dinius]

Come on guys, are they so bad for your consideration?

[Boyan Silyavski]

Hi or Hola Javier,

First of all what is your desired travel, especially Z travel. What do you intend to do exactly with the machine?


-I was recommended before for all axis xx10 balscrew and for z xx05, it worked well, so more or less that's the typical setup for woodworking machine.

On your size table this translates to 2010 for the long screws, and 1610 for the short and 1605 for Z.

- personally i think that the gantry sides should be strong, so i dont like the 1 plate design, if it does not happen to be a light duty wood router. I like the raised table sides design where the bearing rails are top mounted and the working bed recessed , so there is no necessity for high gantry sides. Also much easier to align at home than say side mounted rails.

- a lot of aluminum in the design, will be expensive build it seems, having in mind the price of the 19mm bed itself

-the G540 BOB will not work for high voltage motor driving which is preferred, you need also most possibly nema 23 motors like the SY60STH86-3008B, not 34.

First clear and decide on the design and mass of the gantry, then you will see about the motors. Read my first build all is right there with the exception of the breakout board which could be CSMIO + separate leadshine drives /Am822 or EM806/ , you gain that its a Ethernet solution, if you insist in all in one with the drives but still LPT - Leadshine MX3660 or 4660

I will send you with private my phone, you can call me whenever you like so i can help you what i can.


Its better to post the images as JPG or similar not PDf, for easier viewing

[Clive S]

On your size table this translates to 2010 for the long screws, and 1610 for the short and 1605 for Z.

I think you could get away with 1610 on the X axis as it is only 1500mm long (my X is 1600mm with slaved nema 23's) ..Clive

[JAZZCNC]

I think you could get away with 1610 on the X axis as it is only 1500mm long (my X is 1600mm with slaved nema 23's) ..Clive

Not worth the risk IMO Clive as the performance difference is so little but the risk of Whip is greater. Actual difference in Screw Cost is minimal so why take risk of whip.!

Dinus take Boyan up on his Phone offer as it's much easier to build a Machine if you have a guiding hand from an experienced builder.
Boyan will learn you more in 30mins on Phone than months of searching the internet could. I do this all the time for people in UK and they all say the same thing that the call learnt them more than months searching forums and lifted much of the Mystery and Fog that affects new builders.

[Clive S]

I agree Dean it's not worth the risk for the small cost involved. ..Clive