Neither of these prototype ‘‘anti-sag’’devices are included in any of the dial indicator based alignment measurement systems.Another long span bracket system fabricated from lightweight
Trang 1FIGURE 6.58 Observe the amount of sag on the dial indicator as you rotate the assembly to the sixo’clock position.
“Compensated” readings
To compensate for the sag, add the amount of the sag observed
at the bottom to each bottom reading and the amount of the sag observed on the each side to each side reading
FIGURE 6.59 Mathematically compensating for sag
Trang 2that the centerline of rotation of the spindle and chuck is perfectly in line with the centerline ofrotation of the live center.
6.14 ZERO SAG BRACKETS
Is it possible to defy gravity and construct a cantilevered beam that compensates forthe elastic bending due to the force of gravity? You bet, within limits Figure 6.63 shows abracket design where a second span bar holds a weight so that its position is on the oppositeside of the clamping point on the shaft, thereby counterbalancing the overhung weight Figure6.64 shows another arrangement for long spans where a different type of counterweight isplaced on a coupling spool that ‘‘lifts’’ the span bar Neither of these prototype ‘‘anti-sag’’devices are included in any of the dial indicator based alignment measurement systems.Another long span bracket system fabricated from lightweight carbon tubes is shown inFigure 6.65
FIGURE 6.60 Ideal ‘‘shoot-for’’ readings (assuming no OL2R movement occurs)
FIGURE 6.61 Xmas tree bracket
Trang 36.15 DIAL INDICATOR SHAFT ALIGNMENT SYSTEM
or 3=8 in rods with metric sizes available also It may take several hours for some experiments(also known as prototypes) to get what you need On the other hand, the following tools havealready gone through a development cycle and are commercially available at relativelymodest prices
Xmas tree bracket (bolt
to plate steel) Plate steel
Angle iron gusset support
FIGURE 6.63 Turvac Inc sag compensation bracket design
Trang 46.15.1 ACCUSHIMSYSTEMS
Accushim offers five different dial indicator based systems as shown in Figure 6.66 throughFigure 6.70 The REACT SA-2 system includes a pocket computer with alignment software.Chain, brackets, posts, targets, and rods can be purchased separately to extend the capabil-ities of the systems
SK-1 system cost: $425.00
SK-2 system cost: $575.00
REACT HA-3 system cost: $825.00
REACT HA-2 system cost: $1500.00
FIGURE 6.64 Sag compensation fixture design (Courtesy of Murray & Garig Tool Works, Baytown,
TX With permission.)
FIGURE 6.65 Long span carbon tube (Courtesy of Murray & Garig Tool Works, Baytown, TX Withpermission.)
Trang 5REACT SA-2 system cost: $2250.00
Manufacturers Web site: http:==www.accushim.com=
6.15.2 A-LINESYSTEMS
A-Line Mfg Inc A-750 system as shown in Figure 6.71 is designed for smaller, hard to fitequipment, and ANSI pumps The A-1000 system is designed to clamp directly onto theshafts and reach over the coupling as shown in Figure 6.72 The A-2000 model is designed toclamp onto the coupling hub and reach over the hub flange as shown in Figure 6.73 TheA-3000 system combines both the A-1000 and A-2000 components (Figure 6.74) An optionalPalm OS computer is available with alignment software
A-750 system cost: $875.00
A-1000 system cost: $1025.00
A-2000 system cost: $1225.00
A-3000 system cost: $1675.00
Palm OS with software cost: $750.00
Manufacturers Web site: http:==www.alinemfg.com=
FIGURE 6.66 SK-1 system (Courtesy of Accushim Inc., Lyons, IL With permission.)
FIGURE 6.67 SK-2 system (Courtesy of Accushim Inc., Lyons, IL With permission.)
Trang 6FIGURE 6.68 REACT HA-3 system (Courtesy of Accushim Inc., Lyons, IL With permission.)
FIGURE 6.69 REACT HA-2 system (Courtesy of Accushim Inc., Lyons, IL With permission.)
FIGURE 6.70 REACT SA-2 system (Courtesy of Accushim Inc., Lyons, IL With permission.)
Trang 76.15.3 BENCHMARKSYSTEM
The Benchmark PAS-1 alignment kit is shown in Figure 6.75 and Figure 6.76
PAS-1 System cost: $1200.00
Manufacturers Web site: http:==www.withinspec.com=
6.15.4 MURRAY& GARIGSYSTEM
If you have not been noticing, there are several references in this book to describe the owner
of this company, Malcolm Murray Malcolm is one of the foremost experts in shaft alignmentand holds seven patents, including a patent for several reverse indicator brackets as well as
FIGURE 6.71 A-750 system (Courtesy of A-Line Mfg Inc., Liberty Hill, TX With permission.)
FIGURE 6.72 A-1000 system (Courtesy of A-Line Mfg Inc., Liberty Hill, TX With permission.)
Trang 8many other machinery alignment products shown in this book He has been a consultant tomany of the manufacturers and users of dial indicator and laser-based shaft alignmentmeasurement systems shown in this book The Murray & Garig K-5 shaft alignment system
is shown in Figure 6.77 and Figure 6.78
K-5 system cost: $2300.00 to $2900.00 depending on options
6.15.5 PETERSONALIGNMENTTOOLSCO SYSTEMS
Peterson Alignment Tools Co offers two different alignment kits, the 20RA and 30RA, asshown in Figure 6.79 and Figure 6.80 Also offered is the Alignment Managery 2002
FIGURE 6.73 A-2000 system (Courtesy of A-Line Mfg Inc., Liberty Hill, TX With permission.)
FIGURE 6.74 A-3000 system (Courtesy of A-Line Mfg Inc., Liberty Hill, TX With permission.)
Trang 9software program that operates on Windowsy operating systems that can be purchasedseparately Another version (Alignment Manager 3.1a) can be loaded onto a TI-86 scientificcalculator.
20RA system cost: $795.00 (includes Alignment Manager 2002 software program)30RA system cost: $995.00 (includes Alignment Manager 2002 software program)AMTI-86 scientific calculator cost: $199.00
Alignment Manager 2002 or 3.1a cost: $79.95
Manufacturers Web site: http:==www.petersontools.com=
FIGURE 6.75 PAS-1 system set up for reverse indicator method (Courtesy of Benchmark MaintenanceServices Inc., Toronto, Ontario, Canada With permission.)
FIGURE 6.76 PAS-1 system set up for face–rim method (Courtesy of Benchmark Maintenance ServicesInc., Toronto, Ontario, Canada With permission.)
Trang 106.15.6 TURVACINC SYSTEMS
Turvac Inc offers five different systems Figure 6.81 shows the miniature bracket that is usedfor small couplings Figure 6.82 shows the standard bracket kit Figure 6.83 is the Journey-man system which includes two standard bracket kits, a magnetic base, and the ShaftAlignment Software Program or Technical reference library (the book Basic Shaft Alignment
FIGURE 6.77 K-5 system (Courtesy of Murray & Garig Tool Works, Baytown, TX With permission.)
FIGURE 6.78 K-5 system components (Courtesy of Murray & Garig Tool Works, Baytown, TX Withpermission.)
Trang 11FIGURE 6.79 Peterson 20RA system (Courtesy of Peterson Alignment Tools Co., Channahon, IL.With permission.)
FIGURE 6.80 Peterson 30RA system (Courtesy of Peterson Alignment Tools Co., Channahon, IL.)
Trang 12Workbook and a manual for the Shaft Alignment Software Program) The software programcomes in two versions, one that runs on Windows or disk operating system (DOS)-basedcomputers, and another that runs on Apple Macintosh operating systems The Journeymansystem can be bundled with a Windows (Master system) or Macintosh computer (Profes-sional system) (Figure 6.84).
Miniature bracket cost: $495.00
Standard system cost: $1495.00
FIGURE 6.81 Miniature bracket (Courtesy of Turvac Inc.)
FIGURE 6.82 Standard alignment system (Courtesy of Turvac Inc.)
Trang 13Journeyman system cost: $3495.00
Master system cost: $5995.00
Professional system cost: $5995.00
Shaft Alignment Software Program and technical reference library cost: $1295.00
Manufacturers Web site: http:==www.turvac.com
6.15.7 UPDATEINTERNATIONALSYSTEM
The Update Proaction system is shown in Figure 6.85
Proaction system cost: $2490.00
Manufacturers Web site: http:==www.update-intl.com
6.16 DIAL INDICATOR MANUFACTURERS HARDWARE SPECIFICATIONS
A questionnaire was sent out to all of the above manufacturers concerning the pricing,specifications, and features of their systems The questions are listed below A summary oftheir answers is shown in Figure 6.86 and Figure 6.87
FIGURE 6.83 Journeyman alignment system (Courtesy of Turvac Inc.)
FIGURE 6.84 Master or Professional alignment system (Courtesy of Turvac Inc.)
Trang 14Dial indicator shaft alignment system questionnaire:
1 Are you a manufacturer of a dial indicator shaft alignment system?
_ Yes
_ No
2 Are you a distributor of a dial indicator shaft alignment system? If so, please list themanufacturer of the dial indicator shaft alignment system Please indicate the company,address, phone number, contact person, and Web site (if applicable) of the manufacturer
If you are a distributor only, skip the remaining questions
Questions for the manufacturer of a dial indicator shaft alignment system
1 What are the minimum and maximum shaft diameters that your alignment brackets can beclamped to? If you have different models that can be clamped to different ranges of shaftdiameters, please indicate what range applies to each model
_ (inches? millimeters?) minimum shaft diameter
_ (inches? millimeters?) maximum shaft diameter
2 What are the minimum and maximum distances your alignment brackets can span fromshaft to shaft (or from bracket to bracket)?
_ (inches? millimeters?) minimum shaft-to-shaft span
_ (inches? millimeters?) maximum shaft-to-shaft span
FIGURE 6.85 Update Proaction system (Courtesy of Update International Inc., Denver, CO Withpermission.)
Trang 173 What is the distance from the point where the bracket touches the shaft to the center ofthe span bar? If your bracket system can change the height of the span bar, what is theminimum and maximum distance from the point where the bracket is touching the shaft
to the center of the span bar?
_ (inches? millimeters?) fixed height
_ (inches? millimeters?) minimum height
_ (inches? millimeters?) maximum height
4 Can your brackets be attached to the face of coupling hubs rather than clamp around ashaft diameter?
_ (angular degrees) allowable backlash
11 Do you supply dial indicators with your system? If so, are they standard types of dialindicators that can be purchased directly from the dial indicator manufacturers (e.g.,Starrett, Mitutoyo, Central, etc.) in the event that the user breaks or loses a dialindicator?
_ Yes, indicators are supplied
_ No, indicators not supplied
Manufacturer and model _
12 Can other measuring devices such as LVDTs, proximity probes, lasers, or CCDs be usedwith or on your brackets?
_ Yes
_ No
13 How do you measure the rotational position of the brackets, indicators, and sensors whencapturing readings?
Angle measuring device used _
Trang 1814 If a user damages or loses a component of the system, can the parts be purchasedseparately?
_
_
_
18 What is your warranty period?
_ (days, months, years)
19 What are the recommended calibration intervals? Does the unit have to be sent back tothe factory for calibration, and what is the charge for recalibration? Is the calibration youoffer traceable back to U.S or International Standards?
_ (days, months, years) recommended calibration interval
Send back to factory?
_ Yes—upgrade cost _ (US$)
_ No
22 What is the overall weight of the entire system?
_ (pounds, kilograms) system weight
23 What is the price (or price range) of the system?
_ (US$)
This chapter has shown the wide variety of measurement tools that are used in aligningrotating machinery Chapter 10 through Chapter 15 will show how these tools are used tocapture shaft-to-shaft positional measurements
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