120x240cm(work area) Router Table - steel/aluminium

[Goose80]

Hello.
I have just started my project.

I am going to build a sttel frame and a gentry out of light steel or aluminium. (I am not sure yet about material for the gentry)

I am going to use a skatebearings for drive and pipe.

Now the one thing I am not sure about are the motors.
I want to use 2 steppmotors on to move the gentry but will the 425 oz-in motors from Xylotex.

Any one can help?

[Oldmanandhistoy]

I don’t have a quick answer but there is a thread some were on the zone which helps you calculate stepper motor rating; not sure where but would be worth a search.
Time spent calculating the correct size motors is well worth it and a lot of money can be spent on a set up that just isn’t up to the job.

John

[Goose80]

Yeah I know, I have truying to find some info in 2-3 hours now, but can't find anything.... Propably, I am searching about wrong tread, or using wrong search keywords....

What I see is that very few has bid CNC machines...

[Oldmanandhistoy]

Try here http://www.cnczone.com/forums/showthread.php?t=8129 might be what you need.

John

[ger21]

A Xylotex isn't really recommended for a machine that size. You really should be looking at Gecko drives. As for motor size, it somewhat depends on how much weight you'll be moving, how you plan to move it (screws, rack and pinion....) and how fast you want to move it.

Here's some software to help with motor selection.
http://www.danahermotion.com/design_..._selection.php

[Goose80]

Ok, So the main problem is in driver board not nessesery in the motors?

[Goose80]

What really to you to build such a big machine?

Nema 34 motors with 750ozin and gecodrive? or other things? Please help...

[ger21]

As I said, it's not that simple. You need to know how fast you want go, how much weight your moving, and the method your using to move it. What works for one machine may not work well for another similar size machine.

[Oldmanandhistoy]

Hi,

As ger21 said unfortunately it is not possible to give you recommended drives and stepper ratings with out much more information you will need to do some research.
If you give all the information here maybe some one qualified will do the maths for you.
Questions:

Will you be using ball screws?

What will be the weight of your gantry?

What rapid speed will you be happy with?

What cutting speeds will you be happy with?

What materials will you be working with?

Do you have a maximum budget in mind?

One other thing once you know the rating needed for drives and steppers take a look here http://www.motioncontrolproducts.com/ they have some nicely priced drives (MSD***) .

John

[Greolt]

Goose for the size machine you are looking to build you should look at the Mechmate.

Free detailed plans. Proven design. All the motor sizes etc already worked out.

http://www.mechmate.com/index.html