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adjusting_ls50_crossed_roller_rail_bearing_preload

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adjusting_ls50_crossed_roller_rail_bearing_preload [2016/12/02 00:11]
vik
adjusting_ls50_crossed_roller_rail_bearing_preload [2019/04/18 23:33] (current)
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 +====== Adjusting LS50 Crossed Roller Rail Bearing Preload ======
  
 +Linear crossed roller bearings may need to be re-tensioned if the stage plates are disassembled or become loose for any reason. ​ The procedure is the same for any stage. ​  The instructions will refer to the parts on the LS-50 stage shown below. ​ The principles apply to all crossed roller stages.
 +
 +[{{ :​ls50_preload.jpg?​500 |Click to Enlarge}}]
 +
 +  - Leave the Fixed Rail alone. ​ Do **NOT** loosen the fixed rail screws.
 +  - Remove the Coupler Screws (**2.5mm Allen – M3-0.5**)
 +  - Break loose all of the Set-Screw Rail hold down Rail Screws.
 +  - Slide the stage plate to each end of travel to force alignment of crossed roller strips.
 +  - Snug set screws firmly finger tight systematically. ​
 +    - Move stage plate to one end of travel and snug all of the set screws that are supported by the stage plate and bearings.
 +    - Move stage plate to the other end of travel and snug the remaining set screws that are now supported by the bearings and stage plate.
 +  - Ensure that the stage plate has smooth motion when moved by hand.
 +  - Tighten Set-Screw Rail hold down Rail Screws systematically.
 +    - Move stage plate to one end of travel and tighten Rail Screws that are supported by stage plate and bearings. ​ Tighten firmly but not to full torque spec.
 +    - Move stage plate to other end of travel and tighten remaining Rails Screws that are now supported by the bearings and stage plate. ​ Tighten firmly but not to full torque spec.
 +    - Move stage plate back again and tighten supported Rail Screws to torque of **1.8 N-m.**  ​
 +    - Move stage plate to other end and tighten remaining rails screws to torque of **1.8 N-m.**
 +  - Verify that stage plate still has smooth motion when moved by hand.
 +  - Line up stage plate with coupler and re-install the M3-0.5 Allen Head Coupler Screws.
 +
 +This completes the stage bearing preload procedure.  ​
 +
 +<WRAP center round important 60%>
 +Maximum torque rating for the Screws used on the LS50 is 1.8 N-m or 17in/lbs. Excessive torque will lead to stripped the screws and irreversible damage to the unit. Suggest using a Torque wrench/​screw driver like the one shown below.
 +</​WRAP>​
 +
 +[{{ ::​torque_wrench.jpg?​500 |Click to Enlarge}}]
 +
 +{{tag>​tech_note ls50 ramm zdrive asi}}
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