Hello, i joined this gorup because i´m starting build a CNC machine and need some ideas. I already learned a lot and have some ideas of what i´m going to do. But i have one doubt… my machine is 650mm in the Y axe with 20mm stell rods. Now, one or two threaded rods on the left and right side of the table? Because i don´t know if it it is difficult to align the two motors. Please give me some ideas… thanks.
Hi. I have 585 on Y axis and I have only one motor and driving shaft. If your X axis is around 400mm, I’d stick with just one motor, it should be enough. But install a decent motor. You do not want a cheap one to drive entire gantry 
Thank you Max, that´s what i´m going to do. Some drawings aoiund the net gave me some confusion. I think some people use a second Y axe motor and define in Mach3 as motor A. Don´t know if it is correct and just for curiosity would like to know. Thanks again.
@Jose_Lobo One member of the group @Paul_Frederick mentioned that it will be cheaper to use two inexpensive drives+motor+shafts than one good motor. He knows more about this stuff than I do =)
I personally aim at less time making something and more time earning something =))
@Max_Kalin
I think it is. But be aware there is more work assembling it all. Nothing is for nothing.
@Paul_Frederick Yup, that’s what I was talking about. I want to spend less time building. Unless it’s a LEGO. I love LEGOs =)
@Max_Kalin
Having done it I would have to say the difference is there, and in the midst of it becomes very real too. You have to do things twice. There is no way around it really. It ends up being twice the work too, at least. I do have to add that the results can be rather impressive too though. I have alignment problems with my X axis, and when it jambs the drives can bend the whole frame up. Initially I was expecting to see more of a stall to a stop if I experienced a jamb. Garage engineering can be more surprising than that I suppose.
@Paul_Frederick Did you try setting up sensors? For example when one axle start to jam it will press a stop sensor and the entire process will stop. I have limiters on all of three axles and maybe you could add them to the shafts too.
@Max_Kalin
Thanks for the suggestion but there is a fundamental flaw in my machine that I need to address. The Y axis carriage is out of square, so that causes it to wedge, or loosen up, as it travels. The only thing that is going to fix that is fixing it too. Which with my design is far easier said, than done. Which is why it is not done now. I am still coming up with the easy fix, or at least a fix that I find acceptable to me.
Thank you for your ideas. As i´m making my first machine, one Y motor wil serve for now. But the idea of having two motors will stay here for a future machine. Also learnead the importance of a perfect square table…
@Jose_Lobo
My machine has no table. That makes squaring it up a bit tricky too. I can put it on a table and make it work though. But I don’t have to.