0.5mm accuracy is not acceptable. 0.01 should be considered an absolute minimum for accuracy but try for 0.001. It is unlikely that you will obtain quite this degree of accuracy because of various mechanical limitations which tend to be cumulative.
Originally Posted by charkwai
Yes, I agree with you that 200 watts is quite small for a CNC router unless you are only cutting out PC boards. I would go with the the 800 at a minimum and bigger if you can afford it. If you are buying a spindle then the noise factor alone will more than compensate you for the extra cost.
The term 'grammar nazi' was invented to make people, who don't know their grammar, feel OK about being uneducated.