Rigid couplings - ASA ELECTRONICS INDUSTRY CO.,LTD

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Structure of rigid couplings

Usage Cautions.

ASA Electronics Industry's rigid couplings are manufactured on precision lathes using a single-chuck processing finish (for both same hole diameters and different hole diameters). Clampomg-style coupling maintains the concentricity of both holes by using cutting and slotting processes after the internal stresses are eliminated by heat treatment. Srill, sufficient caution us needed when assembling in order to minimize the radial run-out at high precision.

Measuring methods for parallel and angular misalingmrnts in assembly.

Place shaft (1) of the assembled unit on the V blick, and while rotating the shaft slowly, measure the radial run-out of shaft (2) using the displacement indicator. For example, if the run-out at point A is 0.04, the eccentricity will be 0.02.
Then, taking the value of the radial run-out for point B (position at distance l from point A) to be 0.15, and L tobe 100, the angular misalingment angle α will be given by:

formura

(Strictly, what should be measured is the difference between point B and point A when point B is the rotational position of maximum run-out.)

rigid image1 en

Assembly Cautions.

Set screw style

rigid image2 en

See Fig.2

・Clean the fitting part and remove any dirt.

・While gently rotating the shaft or coupling, alternately fasten the two set screws (located obliquely on the left and right) to the same torque, to fix the shaft to the bottom surface (C).

See fig.3

・Insert shaft (1) and shaft (2), ensuring that they are aligned in a straight line so that there is no angular miaslingment. The correction cannnot be completely effectedif the set screws are fastened when there is angular misalingment.

・It is important not to fasten the set screws too firmly when the shafts are made of soft materials, such as plastics or aluminum alloys. Otherwise the shafts may deform, resulting in angular misalingment.

Clamping style

rigid image3 en

See Fig.4

・Clean the fitting part and remove any dirt.

・While gently rotating the shaft or coupling,alternately fasten the clamp bolt, little by little. The hole diameter of the coupling matches the circumference of the shaft and the misalingment becomes zero. This is a feature of clamping-style coupling.

See Fig.5

・Insert shaft (1) and shaft (2), ensuring that they are aligned in a straight line so that there is no angular misalignment. The correction cannot be completely effected if the clamp is fastened while there is angular misalignment.