axis, pivot, stem, stalk, counter for book scrolls
軸 centers on a central line around which something turns or is organized: an axis, a pivot, or the stem of a plant. The counter for book scrolls extends this idea to the cylindrical core of a rolled scroll.
軸 combines 車 (vehicle, wheel) with 由, which likely contributes the sound and may suggest a central point. The character originally referred to the axle of a cart, the central rod around which the wheel turns.
A cart (車) has a central rod (由) that acts as the axis. Picture the axle running through the wheel, the pivot point for the whole vehicle.
For ジク, imagine a jig (ジ) that holds the axle in place while you work on the cart: jig -> ジク, and the axle is the central pivot.
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axis; shaft; axle
main spindle; main shaft
axle; pivot
basis; foundation; core; criterion; standard
same axle
axis; axle; plan; contrivance
hanging scroll
bearing; shaft bearing; axle bearing; plummer block; pillow block
earth's axis
axle
axis; pivot; central figure; key man
uniaxial
coordinate axis
roller bearing
diffuse axonal injury; DAI
spline shaft
thrust bearing
steering column; steering shaft
penholder (handle into which a penpoint fits)
new method