by TrinityLabs, published
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i dont understand why they would spring load? they do preload is they are using angular contact bearings for thrust control. one side has a double thrus bearing or two angular contact bearings so it can take thrust in both the positive and negative directions relative to its axis the other side (non driven) just "slip fits" thru a radial bearing that was there is no restraint in the plus minus direction. keeps the shaft turning true but eliminates binding due to expansion. also precision rod is a must when double supporting. the X axis on both my lathes are only supported on the "driven" side. (manual lathes) CNC zone is a wealth of info on CNC setups.
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It isn't perfect, but it's coming along.
Intended to use SDP-SI A 7Z 7-031 thrust bearing at either end (or other size appropriate to your lead screw)
This is still an early beta. There is a proof of concept here: brainspl.at/leadscrew-actuator/index.html
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