Shaft Deflection Graphs
These graphs represent the deflection caused by a lateral or moment load applied
to solid cylindrical cross section rods.
For test purposes, 0.250" diameter rods in lengths of one to nine inches and 0.375"
and 0.500" diameter rods in lengths of two to twelve inches were tested. Rods were
mounted horizontally with one end fixed and supported while opposite
ends were left free and unsupported. Rod end deflection measurements were made after
applying each sample load to each unsupported rod length. Loads for the
0.250" diameter rods ranged from one to five pounds and five to twenty-five
pounds for the 0.375" and 0.500" diameter rods. Rod material is 304 stainless steel, as used
in the shaft construction of all MDC motion and manipulation instruments.
These graphs are for reference only and do not represent actual motion instrument
shaft deflection. They are provided as visual aids for understanding the effects of lateral
loading of any stainless steel rod.
Since shaft deflection may have a significant effect on the positioning of
samples, careful consideration must be given to shaft loading and whether the
shaft needs to be supported. MDC recommends that all shafts in excess of
twelve inches must have additional linear or radial support.