Recommendations for Z Axis?

[samsagaz]

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


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

I understand dear Silyavski, i just trying to use materials that can purchase in my country, :/

Using I steel and weld a 10mm plate in one side i will get a box section like you say, but maybe with more weight.

I don t need high speeds, as its just for home projects, i dont need to cut/route fast!

Will check your project #1 again..

[Boyan Silyavski]

I understand dear Silyavski, i just trying to use materials that can purchase in my country, :/

Using I steel and weld a 10mm plate in one side i will get a box section like you say, but maybe with more weight.

I don t need high speeds, as its just for home projects, i dont need to cut/route fast!

Will check your project #1 again..

Even so, you should aim at least at ~200 ipm / 5000 mm/min as absolute minimum. I would say you should aim at 10000 mm/min for a "normall" machine.


Not that you will cut at those speeds but machine needs to be "snappy" with good acceleration. Which is sth i believe you have not considered. At the beginning i was also not aware of that fact. Good that people pointed that to me. Otherwise some jobs will take eternity , too much time even for home.

Now having that in mind, do some research about the efficiency of stepper motors, your load, the motors. Under load it will have only a couple of hundred useful RPM. So do your calculations from this.


What size will be your machine???


PS. here is a link to a calculator, have not checked it extensively but seems right http://techref.massmind.org/techref/...r/estimate.htm

[samsagaz]

Even so, you should aim at least at ~200 ipm / 5000 mm/min as absolute minimum. I would say you should aim at 10000 mm/min for a "normall" machine.


Not that you will cut at those speeds but machine needs to be "snappy" with good acceleration. Which is sth i believe you have not considered. At the beginning i was also not aware of that fact. Good that people pointed that to me. Otherwise some jobs will take eternity , too much time even for home.

Now having that in mind, do some research about the efficiency of stepper motors, your load, the motors. Under load it will have only a couple of hundred useful RPM. So do your calculations from this.


What size will be your machine???

Gracias nuevamente amigo!!!!

Here i attach the sizes of the actual draw



(Sorry for my english)