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Equation table of moment of inertia 

 

 

  Thin shaft 

Position  of  rotational  axis:  Perpendicular  to  the 

shaft through the center of gravity.

 

 

Thin round plate 

Position of rotational axis: Through the center of 

diameter 

 

Thin rectangular plate 

Position of rotational  axis:  Parallel to side b and 
through the center of gravity 

 

Cylinder 

Position of rotational  axis:  Through the center of 
diameter and gravity 

 

Thin rectangular plate(Including Rectangular 

  parallelepiped) 

Position  of  rotational  axis:  Perpendicular  to  the 
plate through the center of gravity 

 

When the rotational axis and load center of 

  gravity and not consistent 

     

 

 

Round plate(Including column)

 

Position of rotational axis: Through the center   

axis 

 

Gear transmission

 

  Solid sphere 

Position of rotational  axis:  Through the center of 
diameter 

 

 

 

 

 

 

 

 

 

 

I

Moment of inertia kg

m        m

Load mass kg 

 

2020-10-13 10:33

DI987004

Summary of Contents for CRA1 100

Page 1: ...1 PRODUCT NAME Rotary Actuator MODEL Series Product Number CRA1 30 100...

Page 2: ...commended Devices 21 Mounting 22 Restriction of the load 22 Operation of shaft couplings 22 Piping and operating direction 23 Operating air 23 Setting rotation time 24 Moment of inertia 24 Table fir c...

Page 3: ...of equipment failure when configuring the equipment 2 Only personnel with appropriate training should operate machinery and equipment The product specified here may become unsafe if handled incorrectl...

Page 4: ...responsibility a replacement product or necessary parts will be provided This limited warranty applies only to our product independently and not to any other damage incurred due to the failure of the...

Page 5: ...or damage to the equipment in the event of malfunction Consider the behavior of the rotary actuator in the event of an emergency stop Devise a safe system so that if a person engages the emergency st...

Page 6: ...he specified speed adjustment range it could cause the product to stick slip or the movement to stop Do not apply an external torque to the product that exceeds the rated output If an external force t...

Page 7: ...rotating shaft the torque that is generated by the product itself will cause the reaction force which is directed to the stopper to be redirected and applied to the rotating shaft This will lead to t...

Page 8: ...riate measures to ensure air quality such as by providing an aftercooler air dryer or water separator Ensure that the fluid and ambient temperature are within the specified range If the fluid temperat...

Page 9: ...ease for each specific product The use of a non designated lubricant could damage the seals Attention of auto switch Design Selection Confirm the specifications Read the specifications carefully and u...

Page 10: ...re 100 m or shorter Pay attention to the internal voltage drop of the auto switch Reed switch 1 Auto switch with an indicator light Except D A96 A96V If auto switches are connected in series as shown...

Page 11: ...ration Ensure sufficient clearance for maintenance activities When designing an application be certain to allow sufficient clearance for maintenance When multiple auto switches are required n indicate...

Page 12: ...an auto switch is not connected to a load the auto switch will be instantly damaged because of excess current short circuit Confirm proper insulation of wiring Be certain that there is no faulty wiri...

Page 13: ...is generated Auto switches will malfunction or magnets inside cylinders actuators will become demagnetized Please consult with SMC if a magnetic field resistant auto switch can be used Do not use in a...

Page 14: ...to switches or an actuator it may cause the auto switch to malfunction due to a loss of the magnetic force inside the cylinder actuator Maintenance and Inspection Perform the following maintenance per...

Page 15: ...l control valve which may contaminate the surrounding area Install a rotary actuator of the air hydro type in locations where it can be serviced easily Since the rotary actuator of the air hydro type...

Page 16: ...etc Then shut off the air supply and the equipment s electric power and exhaust the compressed air in the system If the air hydro unit s supply port is opened with compressed air still remaining in t...

Page 17: ...per installed there is no backlash produced under pressure Table 2 Allowable kinetic energy and safe range of rotation time Size Allowable kinetic energy J Adjustable range of rotation time safe in op...

Page 18: ...torque Table 5 Effective torque table N m Size Operating pressure MPa 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 30 0 38 0 76 1 14 1 53 1 91 2 29 2 67 3 05 3 44 3 82 50 1 85 3 71 5 57 7 43 9 27 11 2 13 0...

Page 19: ...sure is applied from the B port side the shaft rotates counterclockwise Size 30 Size 50 to 100 Fig 1 Rotation range of shaft keyway size 30 Stopper screw A For end adjustment in clockwise direction St...

Page 20: ...Bearing retainer 1 Black 6 Nameplate 1 7 Rotation display plate 1 8 Tube gasket Slider O ring 2 Zinc Chromated 9 Bearing 2 11 Piston seal 2 Black dye 12 Hexagon socket set screw 8 Black dye 13 Spring...

Page 21: ...oid valve speed controller and tube used in the basic circuit shown in Fig 3 Air filter Regulator Solenoid valve Speed controller Rotary actuator Fig 3 Basic circuit Table 6 Recommended Devices Model...

Page 22: ...Operation of shaft couplings As in Fig 6 alignment of the rotary actuator and the mating axis is necessary when the rotary actuator is used with its axis lengthened If misaligned the axis is applied...

Page 23: ...uipped with a direction indicator plate to indicate this Perform followings before piping a Before piping is connected it should be thoroughly blown out with air flushing or washed to remove chips cut...

Page 24: ...nd the actuator received big impact kinetic energy due to inertia force Please refer below for calculation of kinetic energy Allowable kinetic energy for the rotary actuator is limited The limit of ro...

Page 25: ...ity Cylinder Position of rotational axis Through the center of diameter and gravity Thin rectangular plate Including Rectangular parallelepiped Position of rotational axis Perpendicular to the plate t...

Page 26: ...kinetic energy Size Allowable kinetic energy J Without Air Cushion With Air Cushion 30 0 01 50 0 05 0 98 63 0 12 1 50 80 0 16 2 00 100 0 54 2 90 The allowable kinetic energy of the actuators with a cu...

Page 27: ...sorb inertia force There is backlash of the gear because the CRA1 series is a single rack type It is within 1 at the rotation end When there is no backlash and an accurate positional precision is nece...

Page 28: ...28 Calculation of required torque Load type The calculation method of required torque varies depending on the load type...

Page 29: ...ack in reverse when reassembling the rotary actuator the engagement between the gears will be imperfect resulting in an error in the swing range of the key groove Assembly procedure 1 Before assemblin...

Page 30: ...bly drawing Table 10 Parts where grease is to be applied Application of grease Grease Body inner sliding surface GR S 10 Piston Seal groove Slider Sliding surface Tube gasket Piston seal Pinion gear B...

Page 31: ...stance 22 Actuator axis and mating axis not aligned Align the two centers or use a flexible fitting 22 Insufficient output due to a low supply pressure To obtain stable operation adjust the supply pre...

Page 32: ...eatment on that 1 Calculate the kinetic energy applied to the rotary actuator and adjust the load and rotating speed so that the kinetic energy will be within the allowable range 2 Please install the...

Page 33: ...e confirm the range of all swings of the actuator and install external stopper in correct position In this case please provide a buffer angle to the stroke of the actuator Use 100 actuator in the case...

Page 34: ...ed E Format change Additional tightening torque 4 14 1 Sotokanda Chiyoda ku Tokyo 101 0021 JAPAN Tel 81 3 5207 8249 Fax 81 3 5298 5362 URL https www smcworld com Note Specifications are subject to cha...

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