How much end play should an electric motor have?
How much end play should an electric motor have?
Novak recommends 0.010-0.020″ or 0.25-0.5mm of end play for standard 1/10 motors in one of their cleaning guides.
What is axial end play?
Axial, or end play, is the maximum relative axial movement of the inner ring with respect to the outer ring. The end play is directly related to the radial play of the ball bearing. In most part numbering systems axial play is not normally specified. There is often confusion with “looseness” and precision level.
How do you measure axial end play?
Radial play is the clearance measured perpendicular to the bearing axis or more specifically: average outer ring raceway diameter minus average inner ring raceway diameter minus (2 x ball diameter). Axial play is the clearance measured along the bearing axis is known as axial play.
What is maximum end play of motor?
Total end play includes that movement plus the internal clearance within the bearing. Figure 1. The deep groove, maximum or “Conrad” ball bearing—most common type used in horizontal integral horsepower motors below 500 hp.
How do you check End play shaft?
Measure the input and output shaft endplay before removing the oil pump. Check input shaft end play with a dial indicator fastened to the case with the tip place against the input shaft tip. If the reading is out of specifications, look for worn or misassembled parts while disassembling the transmission.
What is end play of a motor?
End play in an electric motor is the amount of axial movement allowed by the motor’s construction. This can be accomplished by a number of ways depending on the design of the motor. If the motor has sleeve bearings, axial movement is expected within the limits of the bearing design.
How do you test axial play?
The end play should be verified by checking the axial movement of the shaft. The shaft should be moved in each direction and loaded with a force equal to between 50 to 150 psi bearing unit load.
What is the axial play?
The axial play is the total axial displacement of the outer ring against the inner ring.
What is the difference between axial and radial play?
RADIAL PLAY is the maximum displacement that one bearing ring can be displaced relative to the other ring in a direction perpendicular to the axis of rotation of the bearing. AXIAL PLAY, or end play, is the maximum relative displacement of the bearing rings, in a direction parallel to the axis of rotation.
What is motor end play?
End play in an electric motor is the amount of axial movement allowed by the motor’s construction. This end play is limited by the motor’s bearing design. The bearing’s primary purpose is to locate the shaft radially so it can be aligned to the driven equipment shaft and efficiently transmit torque to the load.
What is the difference between bearing tolerances fits and clearances?
The gap or lack of it between the hole and shaft is called the clearance. Clearance is determined by the size difference between the parts. Fits and tolerances are used to specify the size range of parts.
How do you control the axial movement of an electric motor?
This can be accomplished by a number of ways depending on the design of the motor. If the motor has sleeve bearings, axial movement is expected within the limits of the bearing design. Most rolling element bearings have much less axial clearance but must be contained in the bearing housing to control the end play.
What is end play in an electric motor?
End play in an electric motor is the amount of axial movement allowed by the motor’s construction. This end play is limited by the motor’s bearing design. The bearing’s primary purpose is to locate the shaft radially so it can be aligned to the driven equipment shaft and efficiently transmit torque to the load.
Is there any axial play in motors with sleeve bearing bearings?
There is generally more axial play in motors with sleeve bearing than motors with rolling element bearings. Prior to coupling sleeve bearing motors it is a good practice to run the motor and mark the rotor position when it is in magnetic center.
What is the normal tolerance for End play on a shaft?
The normal tolerance is 0.005″, so the EP range would be 0.013″ – 0.018″. While these values are typical, larger or smaller values are often used. In general, higher shaft speeds require more end play then lower speed applications.
