Recommendations for Z Axis?

[routercnc]

Well guys, while i wait fedex to give me my rails, i drawing a few options.

Wich think that will be more robust? Option A or B?

Option A

B looks like it has an unsupported overhang

[samsagaz]

Option A

B looks like it has an unsupported overhang

OK thanks!

What about max weight that hiwin HG20 support?

i will use two nema23 steppers (one on each side) because think that the weight will be a little high for just one motor.

will try to use 70V, as i will be using am882 drivers

if weight are too high i think that fixed Gantry will be the solution, but dont know if fixed are better.

[Boyan Silyavski]

OK thanks!

What about max weight that hiwin HG20 support?

much more than you could imagine, especially spread between 4 bearings

i will use two nema23 steppers (one on each side) because think that the weight will be a little high for just one motor.

will try to use 70V, as i will be using am882 drivers

Dont try, do it. If you gantry weighs more than 70kg you will need servo motors for normal; feeds and speeds.

if weight are too high i think that fixed Gantry will be the solution, but dont know if fixed are better.

You have things wrong. Fixed gantry is better not for weight problems but cause the idea what and how to cut is different. Table weight could be bigger than gantry weight



I don't know why are you going backwards with the build. There is enough build information on forum to build a super-duper machine from scratch.

I or C is not stronger than box section, to begin with... I have build uber strong machines from 100x100x4, most people will use 60x60x4. I say ~80x80x3 or 4 is ideal, as it simplifies construction / no diagonal bracing / and is easy to manage at home.

Look my signature build 1. That machine slices through aluminum without a whisper. Plus i have uploaded the plans for free, so you could save yourself a tremendous amount of time, cause all is fully scalable without any modification up to ~ 1200mm wide and 1200mm long. For longer you just have to change the screw with bigger /20/ and if full size just change sides to rotating nuts, which you could see how is done from my project 2 in the signature.

That is a time proven design done with the help of the knowledgable people here, a lot of research and design time. I doubt you could achieve even 1/3rd of that if you continue to buy without draw, think and decide first. Sorry to have to tell you that.
Every small mistake now, translates as days work to fix it later. and money lost, due to buying the improper stuff