Nexen RPS12 User Manual
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15FORM NO. L-21235-G-0413Table 6Screw Tightening TorqueNm [in-lb]Preloader ScrewAll Models - 1.7 [15] MaxShoulder Screws (Mtg. Plate)RPS-PRE-064 M8 x 1.25 40 [350]RPS-PRE-090 M8 x 1.25 40 [350]RPS-PRE-110 M8 x 1.25 40 [350]RPS-PRE-140 M8 x 1.25 40 [350]RPS-PRE-200 M12 x 1.75 120 [1060]Gearhead Screws (Mtg. Plate)RPS-PRE-064 M4 x 0.7 5.3 [47]RPS-PRE-090 M5 x 0.8 10 [88]RPS-PRE-110 M5 x 0.8 10 [88]RPS-PRE-140 M6 x 1.0 17.5 [155]RPS-PRE-200 M8 x 1.25 40 [354]Preloader Mtg. Screws (2x)All Models M6 x 1.0 17.5 [155]3. Verify pinion rotational axis is as close to 90° from therack run axis, the pinion rotational axis is also parallelwith the tooth tops or rack mounting surface, and therack is centered between the pinion bearing flangesas shown in Figure 1.4. Rotate the preload adjustment screw clockwise toseparate the pinion from the rack. This will ensurethat clearance is initially present. Then seat the pinioninto contact by turning the preload adjustment screwcounterclockwise until a slight resistance is felt andthen back the screw off 1/8 of a turn. This step iscritical to prepare for preload settings.5. Place a magnetic base dial indicator on the movablecarriage, and locate its probe on the OD of the pinionflange such that it measures in the direction of preloadtravel.6. Apply the preload of 0.010 - 0.015 mm [0.0004- 0.0006 in] with the preload application screw(s)and then tighten the preload lockdown bolts totheir recommended torques. See Table 6 for NexenPreloader System torque values. Typically the preloadwill change slightly when the preloader lockdown boltsare tightened. If tightening the preload bolts causesthe amount of preload to fall outside of specificationsrecord how much it changed when tightening thepreloader lock down bolts then loosen the preloadingsystem and repeat the preloading procedure butadjust the initial preload (more or less) by the recordedpreload deviation. This procedure will ensure thatwhen the preloader lockdown bolts are tightened theamount of preload should fall within specifications.7. With the pinion preloaded to specifications manuallytraverse the carriage down the run by hand (if possible)checking for smoothness and uniformity of resistance.If manually applied motion is not possible, use theservo motor to traverse the carriage along the run, withjust enough torque output to move it while looking andlistening for resistance to motion.Proper roller to tooth meshing is critical and can be verifiedby two methods depending on which you find easier tointerpret:Option 1: Apply a slow drying machinists dye to the pinionrollers and move the RPS system back and forth over ashort distance (about 1/2 meter). It is important the dyeremain wet so it transfers to the rack teeth and is notdepleted. Analyze the dye pattern transferred to the teeth.If the meshing geometry is good the dye will be spreadevenly all the way across the tooth face over the middle2/3 - 3/4 of the teeth with none at the top and bottom. Ifthis section is properly aligned clean off dye residue andrepeat as necessary to verify the RPS alignment over theentire length of travel. See Figure 20.Option 2: Apply a small amount of high contrast greaseto each rack tooth face over 1/2 meter of rack. Operatethe RPS system back and forth over this 1/2 meter oftravel. If the meshing geometry is good the grease will beGood Alignment Poor AlignmentContact Pattern Contact PatternFigure 20completely wiped away all the way across the tooth faceover the middle 2/3 - 3/4 of the teeth with some remainingat the top and bottom. If this section is properly alignedclean off grease with a solvent and repeat as necessaryto verify the RPS alignment over the entire length of travelas shown in Figure 20.SYSTEM ALIGNMENT VERIFICATIONIf the dye or grease contact pattern indicates a meshingproblem, diagnose the problem, correct it, and then repeatthe Applying Preload and System Alignment Verificationprocedures. |
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