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Fig 530: An inspection machine with a ball screw assembly [11]
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The advantage of this drive is its low cost, which makes it the most popular drive used in industries for guideways on a working table But this transmission drive is not a good alternative for short travel distances such as in ultra-precision machines This drive has a high tendency for building up a high inertia and hence leads to a loss of power in the motor for acceleration purposes since a large portion of the motor torque will be used to overcome the rotary inertia of the drive The drive has a critical speed limitation and a low stiffness that reduce the frequency response and increase the settling time Ball screws are also used in other applications such as engraving machines, medical instruments, semiconductors and laboratory equipments An example of an inspection machine utilizing a lead screw is shown in Figure 530 where the ball screw assembly is indicated as D Certain ball screws are incorporated into the table itself forming some sort of a ball rail table as shown in Figure 531 Fig 531: A ball rail table [13]
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Friction drives are an alternative to ball screws to provide translational motion, and they operate by pressing a steel wheel against a steel bar When the wheel rotates, the bar moves The typical work method is shown in Figure 532 Another detailed friction drive application is explained and shown in Figure 533 The friction drive unit consists of a housed motor or a tachometer mounted on precision bearings with a hardened steel drive roller mounted on the spindle nose The motor force is achieved by traction between the
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Fig 532: The work method of a typical friction drive [19]
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drive roller and a machine mounted plain hardened ground bar Preloading the drive bar and roller together with a preloaded back up roller opposing the main drive roller create adequate friction [19]
Pinch preload assembly Pinch roller
Traction bar Terminal box
Friction roller Brake
Front spindle bearing DC torque motor
Spindle support bearing
Tachogenerator
Fig 533: An intricate friction drive assembly [19]
Starrett uses friction drives exclusively on all three axes of every DCC machine that is produced These drives incorporate a direct shaft drive to a precision drive band that totally eliminates hysteresis (backlash) This is a true Zero Backlash System (Figure 534) When dealing with highly tuned DC servo-controlled motors, hysteresis in the drives and the machine frame cannot be tolerated for maximum positioning accuracy and repeatability These drives have a very low friction and induce minimum vibration into the machine, which eliminates the reciprocating shaft that induces vibration into the machine This is commonly found in the case of ball screw or lead screw drives Another application of this friction drive can be found in the Ultra-precision CNC Diamond Turning Machine APT 300, designed and developed by the Central Manufacturing Technology Institute, Bangalore, India (Figure 535) This machine can produce an optical quality surface finish of the order of 10 nm Ra One of the criteria that allows for achieving the surface roughness of this excellent quality is the use of a friction drive to control the diamond tool, which has an atomic level of sharpness The work head slide (z-axis) and tool slide (x-axis) are supported on hydrostatic pads that provide the desired stiffness and damping ensuring a very precise and fine movement without any stick slip Drive to the work head and the tool side is given through a friction drive system and
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Drive shaft Drive band
Piston
Preload idler
Air pressure inlet
Fig 534: A friction drive
CNC ULTRA-PRECISION DIAMOND TURNING MACHINE APT 300
Fig 535: A CNC ultra-precision diamond turning machine APT 300 made by CMTI Bangalore, India
direct drive DC torque motor A high resolution tacho is used for an extremely smooth and ripplefree motor rotation at speeds as low as 1 revolution for 500 min The resolution scale of the work slide and tool slide measuring system is as low as 001 m Most heavy duty and high performance friction drives are capable of moving very large payloads over very long distances (exceeding 50 m) at a very high velocity (5 m per second) For instance, the HPF friction drive from Parker Hannifin Corporation has a thrust capacity of 675 lbs (3,000 N)
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