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How to Select an Assembly 5 - 8 10 11 Application Guide 9 Screw Travel Life Maximum Speed Maximum Compression Load 12 Motor Sizing 13 Part Number Description 14 15 - 18 Definitions > 0.500 inch Diameter Screws 22 - 29 30 - 37 38 - 45 46 - 53 0.625 inch Diameter Screws0.750 inch Diameter Screws 1.000 inch Diameter Screws 1.500 inch Diameter Screws 54 - 61 > 0.625 inch & 16 mm Diameter Screws0.750 inch & 20 mm Diameter Screws 62 - 69 70 - 77 > Motor CouplingsHand Crank, Other Motor Mounts, Wiper Kits, Bellows, and Chrome PlatingMotor Wrap Packages 94 - 95 96 97 98 99 Rotary Incremental Encoders...

with a 32 inch move down, then up 32 inches every 90 seconds for 9 hours per day for 5 days per week and 50 weeks per year (32 x 2) inches 90 secX60 sec 1 minX60 min 1 hrX9 hr 1 dayX5 days 34,600,000 1 weekX50 weeks 1 yrX6 years= inches of travel assembly needs to last 6 years > Specifications subject to change without notice

This is a mechanical limitation defined as the top speedwhich, if exceeded, has the potential to cause excessive vibration, and damage to the screw, or support bearings. Screw charts are provided for all screws in RPM of the screw. To convert to inches/second, multiply by the desired screw lead. > Example #1 Continued : Maximum linear speed= 5 inches / second Selected screw= RS075020 > Example #1 Continued : sec Xrev .200 inch60 sec minX=5 inches 1500 RPM Example #1 Continued (from pages 38-45) : Maximum travel length= 32 inchesSelected screw= RS075020 Repeatability= 0.001 inches (use Preloaded...

Impacts orVibration Speed(in/sec)Min. SafetyFactor Acceleration(G's) NoneSmall < 51.0 - 2.02.0 - 3.0 < 0.250.25 - 0.490.50 - 0.993.0 - 4.0 5.0 - 9.910.0 - 20.0 OperationConditions Loading TypeMin. SafetyFactor No applied impact orvibration loads.1.0 - 2.02.0 - 6.0High impact, vibration orthrust loads are present. > 20> 14.0 - 8.0MediumLarge Stationary > Specifications subject to change without notice

Step 8 - Review Other IssuesMotor Control System > The motor control system selected can have a profoundeffect on the life of a ball screw assembly. Servo motor systems and their peak torque availability can produce high thrust loads to a ball screw assembly. Having too high an acceleration rate, or slamming a nut against a support hous- ing, can cause large thrust forces. These forces can cause a coupling to break, a nut to be damaged, a ball screw to be bent, or a support housing to be damaged. Care should be taken in selecting the correct motor control system to operate a particular ball screw...

(rolled, precision, ground) (%) > (none, low, medium, high) (inches or mm) > (millions of inches or Km) (inch/ft or mm/300mm) > (inches/sec > 2 or m/sec > 2 ) (round, vertical, "L") > (inches/sec or m/sec) (NEMA 23, 34, 42, other) > Distance (in or mm) (Resolution) Time > Load Weight as Seen by the Ball Screw (pounds) Horizontal Application Vertical ApplicationAdditional Thrust Load L Load W > = N Force T > = Load applied tothe screw from anexternal source Load W > = Travel Length (L-N) >

Simple Simple RigidSimpleRigidRigid S > F = 1.00 S > D Fixed Simple S > F = 1.00 > D = Maximum screw speed (revolutions per minute).Screw support factor (rigidity of support housing). > F = Diameter factor. d = > screw diameter + root diameter 2 F = 2.23 > F D = Unsupported screw length ("D" distance betweenbearing supports). > Note: See the individual ball screw sections for exact Maximum Speed information 1.500 inch diameter1.000 inch diameter0.625 inch diameter16 mm diameter0.500 inch diameter 0.750 inch diameter20 mm diameter rev/min of the screw Maximum speed - 200400800600100020003000 100...

C > T = created thrust force (lbs) d > = lead of screw (in/rev) e > = screw efficiency (90% =.9) F > TLS = total frictional force (lbs) T > Total = T > Acc +++ TTT > BreakawayFrictionGravity SF J > 2 Load = load inertia (oz-in ) J > = lead screw inertia (oz-in 2 ) T J > Load Acc =386 1 > J > LS ++ J > Motor (oz-in) t J > 2 Motor = motor inertia (oz-in ) a 2 L > = lead screw length (in) d > 2 lb O > = angle of load from horizontal (degrees) 4 J > LS = L R2 > = density of steel screw (4.48 oz/in (oz-in 2 ) 3 ) J > Motor = > See Motor Data ( not included in this catalog ) (oz-in 2 ) R > = radius...

(Fx) There are three different ball screw types available. Theyare the Rolled Screw (RS), Precision Screw (PS), and the Ground Screw (GS). There are three available nut flanges. They are a roundflange (F1), a vertical bracket (F2 or F3), and a "L" bracket (F4 or F5). If selected, these brackets are premounted to the nut on the ball screw assembly. The vertical bracket and "L" bracket options are available with either an English or Metric interface for mounting of the user load. Since the round flange has thru holes, the user can use either English or Metric nuts & bolts. > (062) These three digits...

Using a preloaded nut always eliminates back-lash, therefore the unidirectional & bidirectional repeatabil- ity values will always be the same . > Preloaded and non-preloaded ball screw nut assembliesare available for use in the RS and PS series. The GS series is only available with a preloaded nut. A preloaded nut ensures there will be no ball screw movement, without nut movement, when the ball screw direction of rotation is changed. A non-preloaded nut will have some backlash, ball screw movement before nut movement, when the ball screw direction of rotation is changed in horizontal applications....

Ball screw assemblies require a small amount of greaseor oil for proper, long term operation. Lubrication will decrease system wear and the potential for oxidation of the ball screw surface. For most applications, a medium to heavy oil, light grease, or silicone based lubricant is recommended. The many built-in pockets within the ball screw nut allow the adhesive properties of these lubricants to be stored for extended periods of time.For high speed applications, a light grease is recom-mended, while the ball screw should NEVER be operated dry for any length of time. For some low speed and lightly...