Diameter 6mm Pitch 1mm Rolled Ball Screw
Product Description
According to the standard of JIS,we classified our lead accuracy through E, e, e300 and e2π, four main regulations. As figure 1.3.1 ~ 1.3.3 shown in below, all the definition and tolerance are specified.
To test the accumulated travel deviations for grade C7 and C10, the tolerance will be chosen in
random 300mm of useful length and evaluated if it is qualified with the e300 table of 1.3.3.
| Terms | Reference | Definition | Allowable |
Travel Compensation |
T | Travel compensation is the deduction between specified and nominal travel in the useful travel. A slightly smaller value compared with nominal travel is often selected by customer, to compensate for an expected elongation caused by temperature rise or external load. Therefore ” T ” is usually a negative value. Note : if no compensation is needed, specified travel is the same as nominal travel. | |
| Actual Travel | Actual travel is the axial displacement of the nut relative to the screw shaft. | ||
| Mean Travel | Mean travel is the linear best fit line of actual. This could be obtained by the least squares method. This line represents the tendency of actual travel. | ||
Mean Travel Deviation | E | Mean travel deviation is the deduction between mean travel and specified travel within travel length. | Table 1.3.2 |
Travel Variations | e e300 e2π | Travel variations is the coverage of 2 lines drawn parallel to the mean travel. Maximum width of variation within the travel length. Actual width of variation for the length of 300mm taken anywhere within the travel length.Wobble error, actual width of variation for one revolution (2π radian) | Table 1.3.2 Table 1.3.3 Table 1.3.3 |
Cautions About Use of Ball Screws:Ball screw assemblies are delicate components.Therefore,extra care must be taken to prevent the ball track from damages that caused by edged component or tools.
Meanwhile, the steel ball is very easily fall out of the nut or over stroke. Don't disassemble it.
Otherwise,the ball screw will be damaged.
To prevent steel ball fall out of the nut through the disassembly of screw and nut or over stroke, please be careful while operating.
If the steel ball falls out, please contact with ALM Linear Motion for further instruction.Do not attempt to reassemble, which might cause permanent damage to the ball screw.
If disassemble is required, please use a transfer pipe which has minor diameter than the screw
diameter to transfer the nut to prevent falling out of the steel balls.
Precision rolled ball screw catalog:
miniature series C3 C5 C7 ball screw-ALM 3.31M.pdf
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