Homemade CNC machine with materials from a DIY simple tools

Iron square tube has an edge length of   millimeters at least a  millimeters  nut must fit to the inside the drill  hole for the ball bearings should be  close to the lower edge of the tube  consider that the  millimeters nut is  used at the inside of the tube  thus the hole should not be too close to  the lower edge the outer diameter of the  ball bearings must be clearly below the  edge of the iron tube.

There must be an  offset between the drill holes at two  sides of the tube because the bolts and  nuts used to mount the ball bearings  should not get in touch the drill holes.

For the ball bearings are done at the  flat sides of the square tube which  should be no problem  at the construction shown here some  drill holes are done on the edges in  order to make those holes I am using two  aluminium angles on a wooden plate as  guide for the iron tube with a second  wooden plate the construction is  attached to the drill press the edge of  the iron square tube is filed and the  place for the drill hole is marked with  the center punch the drilling is done in  three steps starting with the three  millimeters drill.

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