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Mechanical
- Jun 17, 2014
- 2
Dear all:
I'm coming across a design problem today. We need to support a Rigid structural frame for rotation. The frame is supported by two pillow block spaced 2100mm apart, a 100mm Dia. Rod/Shaft(2200mm in length ) is connecting through them and clamped on both sides, So the center rigid frame is rotating (Somewhat like a rotating bbq chicken frame( ) except it is more sophisticated and gigantic.) I don't have good access to some good fab shop for high precision fabrication for this bearing shaft, and longevity of this part is required.
Problem:
1) Concentricity is very critical
2) Align Rotating Axis
Configuration:
-P-RRRRRRRRRRRR-P-
|--- L=2200 mm-------|
*Rigid Frame connecting the two pillow blocks
My Take:
1) Frame will be spaced to just next to the pillow block for direct shear and minimizing the bending
2) Speed of rotation is very low, like 10rpm or so didn't mind to consider resonance.
3) Spherical roller bearings will be used to minimized Angular mis-alignment, but not Offsets.
Any recommendation to the design? If I'm sending to a fab shop, I don't have the confidence they will get the offset and alignment right. Is there anyways to ensure this alignment/offset to be taken care of? As this shaft will take heavy direct shear, like 8,000-9,000kg
or Am I worrying too much and the two Spherical Roller Bearings will take it up without any problems?
I'm coming across a design problem today. We need to support a Rigid structural frame for rotation. The frame is supported by two pillow block spaced 2100mm apart, a 100mm Dia. Rod/Shaft(2200mm in length ) is connecting through them and clamped on both sides, So the center rigid frame is rotating (Somewhat like a rotating bbq chicken frame( ) except it is more sophisticated and gigantic.) I don't have good access to some good fab shop for high precision fabrication for this bearing shaft, and longevity of this part is required.
Problem:
1) Concentricity is very critical
2) Align Rotating Axis
Configuration:
-P-RRRRRRRRRRRR-P-
|--- L=2200 mm-------|
*Rigid Frame connecting the two pillow blocks
My Take:
1) Frame will be spaced to just next to the pillow block for direct shear and minimizing the bending
2) Speed of rotation is very low, like 10rpm or so didn't mind to consider resonance.
3) Spherical roller bearings will be used to minimized Angular mis-alignment, but not Offsets.
Any recommendation to the design? If I'm sending to a fab shop, I don't have the confidence they will get the offset and alignment right. Is there anyways to ensure this alignment/offset to be taken care of? As this shaft will take heavy direct shear, like 8,000-9,000kg
or Am I worrying too much and the two Spherical Roller Bearings will take it up without any problems?