Forces exerted on support rollers?

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SUMMARY

The discussion focuses on the forces exerted on support rollers for a rotating steel tube assembly, specifically a 49" diameter steel tube with a welded 6" x 57.5" diameter steel ring, rotating at approximately 27 RPM. The assembly includes 42 solid steel rods and is supported by a bearing-mounted shaft and two 14" diameter rollers positioned at 36 degrees from vertical. The inquiry revolves around whether moving the rollers closer together, to a configuration of 60 degrees apart, would increase or decrease the force required to rotate the unit, which weighs 10,000 lbs.

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A 49" dia. steel tube (shell) with a 6" x 57.5" dia. steel ring (Tire) welded to the tube rotates horizontally at ~ 27 RPM. Inside of the shell are 42 - 2.5"dia x 6' long solid steel rods. It is held at one end by a 5" dia. bearing mounted shaft, at the other end the Tire sits on 2 bearing mounted 14" dia. rollers. The shaft support and the support rollers are 78" appart(from center of bearing to center of roller). The total wieght of this unit is 10,000lbs. The support rollers sit at 36deg from vertical or 72deg from each other. Is the force required to rotate the entire unit increased or decreased if the rollers are moved closer together so they were say 60deg apart? I have attached a quick sketch for clarity.
assem1.jpg


assem2.jpg


I hope I didn't miss something. Any help would be really great guys...Thanks in advance.
 
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Wow! I would have thought at least one of you "Master of statics" would have attempted to tackle this.
 

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