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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