Catalog – Components - Allied Automation, Inc.

Design ConsiderationsLoad CapacitiesLubricationLINTECH shaft assemblies, linear bearings, or carriage assembliesrequire a small amount of grease or oil for proper,long term operation. Lubrication will decrease system wearand the potential for rusting of shafts and linear bearingsurfaces. For most applications a medium to heavy oil, lightgrease, or silicone based lubricant is recommended. Themany built-in pockets within the linear bearing allows theadhesive properties of these lubricants to be stored for extendedperiods of time while minimizing sealing problems.To obtain the estimated travel life for a given application,the linear bearings or carriage assemblies should not run dryfor an extended period of time. This lubrication schedulewill ultimately need to be determined empirically duringoperation at the installation site since it can vary dependingupon the environment, operation conditions, quantity andtype of lube used, and other unforeseen conditions.All LINTECH shaft assemblies, linear bearings, and carriageassemblies are shipped lightly coated with a rustpreventative oil in the bearings or on the shafts. This willhelp prevent corrosion during the shipping period of theproduct. It is highly recommended that all shaft assemblies,linear bearings, and carriage assemblies be lubricated duringinstallation or prior to operation. Also, periodic re-lubricationof the linear bearings, or carriage assembly, and shafts,will help assure that the rated life of the system is obtained.Additional details on all LINTECH shaft assemblies, linearbearings, and carriage assemblies are available from theService Manual. This manual discusses the recommendedlubrication and provides additional important guidelines forfrequency of lubrication based upon several conditions.NOTE: Use of WD-40 or other cleaning solvents shouldstrictly be avoided as they can cause damage to the linearbearing and shaft.Frictional ResistanceThe total friction resistance of a LINTECH linear bearingor carriage assembly can be calculated by using the followingequation.R =RWx+F s= Frictional resistance (lbs)W = Load weight (lbs)F s= coefficient of friction= Frictional resistance - seal drag (lbs)Note: LINTECH recommends using = .01 for alllinear bearing and carriage assemblies series.The coefficient of friction ( ) of a LINTECH linearbearing or carriage assembly consists of the rolling (operating)friction, and the static (breakaway) friction. Two mainfactors affect the coefficient value. The type of lubricationused (i.e. oil, grease, or none) and the ratio between thetotal load weight and the dynamic load rating of the linearbearing or carriage assembly used.For most applications, LINTECH recommends using avalue of .01 for the coefficient of friction. This value can beused for all linear bearings or carriage assemblies. The .01value provides for an adequate safety margin when evaluatingsystem performance. Other frictional resistances of aLINTECH linear bearing are seal drag and system preload.While wiper seals are used to retain lubricants and to prevententry of foreign particles into the linear bearing, theywill increase the frictional resistance of the system. Increasingthe preload of a linear bearing will also add extra frictionalresistance. The chart below lists the nominal values ofthe LINTECH linear bearings or carriage assemblies.Frictional Resistance - F s (seal drag)AModel NumberF s(lbs)Model NumberF s(lbs)xLBC or xLBO-8xLBC or xLBO-10xLBC or xLBO-120.50.40.4TRCA-8-xxTRCA-10-xxTRCA-12-xx2.01.61.6xLBC or xLBO-16xLBC or xLBO-20xLBC or xLBO-24xLBC or xLBO-320.45.07.08.0TRCA-16-xxTRCA-20-xxTRCA-24-xxTRCA-32-xx1.620.028.032.0DLBC or DLBO-8DLBC or DLBO-10DLBC or DLBO-120.50.40.4TRCA-8-6TRCA-10-6TRCA-12-61.00.80.8DLBC or DLBO-16DLBC or DLBO-20DLBC or DLBO-240.45.07.0TRCA-16-6TRCA-20-8TRCA-24-12x = blank for LBC/LBO, x = S for SLBC/SLBOxx = 12, 18, 24, or 30 inch carriage lengths0.810.014.0Specifications subject to change without noticeLINTECH ®Positioning ComponentsA-11