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need a diy CNC that MILLS STEEL, what do I need? Answered

Hey I'm preparing myself for building a DIY CNC MILLING MACHINE.
right now I'm at the "shopping" part of the project- buying parts (motors, drivers, misc. electronics) can you help me buy give me a hint of what I need (preferably EBAY links/ prices)?

requirements for the machine:
- MUST be able to mill/cut (stainless) STEEL (time is not a concern so it's ok if it runs slowly as long as it's able to make a (small)stainless steel part)
- would be nice if I could run it manually aswell (no computer, no cnc, just hanles or remote controller)

- would this http://www.ebay.com/itm/321060801150?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2648 be sufficient?
- what do you recommend for the spindle? (is there anyway I can connect a professional servo motor? as I might have one of those)
- was thinking square steel profiles for the frame, what do you recommend?
- for starters I cant afford ballscrews so I'll use trapezoidal treaded rods, other sugestions?
- any thing else i need to know? - thanks!



Whilst its not impossible to make a machine rigid enough to mill steel, it will be very difficult. I really would suggest you find a cheap second hand machine and computerise it instead - you get all the cast iron you need, in the right shape and for a better price than making your own.

Fabricated frame machine tools are fairly rare beasties: there are good reasons why real machines use cast iron, as you will soon find out if you use RHS.

CONCRETE has been used successfiully to build machine tools of exceptional rigidity - that might make an interesting approach.

WOW. Could you supply a link to the concrete tools please.

Here's one

A guy named Pat Delaney in Texas has an incredibly well-documented step-by-step guide to building a mill out of car engine blocks. His process builds upon the fact that engine cylinders are bored to very high tolerances, and are parallel to each other and perpendicular to the top of the engine block.

Check it out. Very impressive stuff!


Look up gingery milling matching for plans