Now for the frame.
First I had to fix a construction misalignment (explained in the picture bellow), that caused the the stepper motor axis to collide with the linear rail bar and twist and rotate eventually breaking the coupler in two.
I did it by cutting the corner stuffing (inside the cutted tube and over the corner) a metal bar that I had laying around (and was pretty much the height I needed), and then weld it and cut it to the desired length. The picture gives a clear idea. The fact that the bar entered in the tube also acted as an reinforcement. I was quite happy with the result.
Modifying/fixing the rail angle |
One other thing I didn't liked in the initial design was the bottom bars in the frame. The initial idea was to put the bottom plane over these bars. But any millimetric offset would mean that the "floor" of the CNC would be like bump or a dip. So I removed the bars, used them to reinforce two of the sides (for the axis that clamps on the top side. The bottom side would probably cause collision problems) and the corners in the bottom square.
Modified Frame |
After the paint job |
The picture bellow was taken before all electronics were in place but the machine is all now fully loaded and tuned.
Assembled Axis and Frame |
More modding is on the way. Electronics are next. So stay tuned...
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