shaft's total run-out changes after being mounted onto the assembly
shaft's total run-out changes after being mounted onto the assembly
(OP)
hi everybody,
it's a shaft supported on bearings both ends.
http://files.engineering.com/getfile.aspx?folder=9...
when tested by dial indicator outside the assembly frame, total run out is within tolerance, i.e. 0.1mm. but when inserted into the frame, it changes to 0.3mm. I guess it is the frame that pushes the bearings and their housings to a deflection which can cause a change in run out, but 0.3mm (0.2 difference) is too much. I don't believe that little force can change the run out to this level regarding the shaft dimensions:
shaft diameter = 40 (shoulders) & 70 mm (barrel)
shaft length (span) = 450 mm
what shall I do? any idea?
it's a shaft supported on bearings both ends.
http://files.engineering.com/getfile.aspx?folder=9...
when tested by dial indicator outside the assembly frame, total run out is within tolerance, i.e. 0.1mm. but when inserted into the frame, it changes to 0.3mm. I guess it is the frame that pushes the bearings and their housings to a deflection which can cause a change in run out, but 0.3mm (0.2 difference) is too much. I don't believe that little force can change the run out to this level regarding the shaft dimensions:
shaft diameter = 40 (shoulders) & 70 mm (barrel)
shaft length (span) = 450 mm
what shall I do? any idea?
RE: shaft's total run-out changes after being mounted onto the assembly
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: shaft's total run-out changes after being mounted onto the assembly
If you think the shaft is bent you could try to straighten it while mounted in the frame.
RE: shaft's total run-out changes after being mounted onto the assembly
You could if all else fails determine the direction of the skew and using a hone stone carefully refit the bearing mount to the frame. Or as the old timers would say scrape it in.
Bill
RE: shaft's total run-out changes after being mounted onto the assembly
so you could tell that the shaft is bending, I will examine this as Billpsu said,