Originally Posted by smarbaga i am thinking of a 36" travel on 1" thompson ( or equal) shafts with 2 supports at each end about 3-4" apart.
100 pounds might be high... i really don't know what my z axis will weigh
mostly for cutting wood, plastic and maybe aluminum
probably more like 25 lbs, i always like a little elbow room,
i guess 50 lbs is a big enough elbow |
I ran the following numbers through a program that computes the deflection for a simply supported beam. I assummed a 1" solid steel shaft with an E of 30 x 10^6 psi. The support points were pinned at one end and rolling at the other. The spacing between supports was 36". A load of 50 lbs. was placed midway between the supports. Under these conditions the deflection at the load was .033 in. Fixed supports and double supports would reduce this further but the analysis is of the indeterminate type which the program can't handle. Let me know if you want to run any other scenarios.