Quote Originally Posted by scnc View Post
Hi all,

I have attached the beginning steps to building my cnc machine. I hope to make it approximately 4x3 or 5x3 foot

Attached is the image of the metal fabricated framework, with brackets on each corner which will house the plyboard bed. There will be no top and bottom framework but only on the sides, in order to allow full sheets of boards to be cut continuously hopefully if this can be achieved). If there was framework on all four sides I am limited to that bed space. Is that right?
If you're going with a frame that big you'll need supporting beams under the bed otherwise you'll get deflection and vibration, cross bracing etc. I'm presuming that you're making it out of steel? Box section would be best in terms of strength, something around 50 x 50 x 4. I'd suggest having a look at Jonathan's build thread to give you some ideas http://www.mycncuk.com/forums/router...-building.html or Bruce's (motoxy) http://www.mycncuk.com/forums/router...challenge.html or one that's just starting is wobblycogs http://www.mycncuk.com/forums/router...s-cnc-mk1.html plenty to chose from ;)

Also Can anybody give any clues about what stepper motors, ball screws, router, belts if i need any? bearings, tracks, brackets and drivers I would need?
As a rough guide without knowing too much else (especially your budget) the norm seems to be 3Nm NEMA 23 steppers and something like the M752 drivers (from Zapp), ideally Profiled rail and linear bearings (expensive) or alternatively 25mm supported rail (cheaper) and bearings. Ballscrews 1610 with anti-backlash ball nuts as you're going up to about 1500mm, anything over this and you'll need to . Ball screws (2 on the X axis because of the length you want) driven by belts and reduced 2:1 to the stepper.

How long would it take to make? and how difficult will it be?
How long depends on how deep your pockets are, how much time you have to put into the project, how skilled you are, what tools you have available to use...etc. etc. i.e. how long is a piece of string lol How difficult is it....again depends on your skill level with tools, ability to learn new things, willingness to learn etc.

I do think the best way would be to get someone to build it for me.
Could always buy an off the shelf CNC router?