Machinedesign 1604 Hand Held Instrument 0 0

Handheld monitors and more

April 1, 2000
Here we cover several new technologies and existing motion products

Hand-held instrument monitors plant-floor conditions

A portable predictive-maintenance instrument, which stores up to 500 points of machinery data, performs multiple condition-monitoring functions. Called the CMVL10 Picolog Data Logger, the instrument performs fast, accurate vibration analysis and condition monitoring of bearings and rotating machinery such as pumps and fans. It lets technicians detect early signs of deterioration in machine components so corrective action can be taken during scheduled maintenance periods, thus reducing downtime and boosting productivity. The pocket-sized device weighs just 6 oz and is 6-in. long. Operators take measurements in seconds by applying a sensor to a machinery point and pressing a button.

The device performs three types of measurements: enveloping, standard vibration, and “SEE” acoustic emission monitoring. Enveloping isolates high-frequency acceleration signals amid general machine noise so the operator can detect incipient damage to bearings, gears, and other rotating components before catastrophic failure occurs. Both enveloped peak and enveloped average data are available.

In performing standard vibration analysis of rotating machinery, Picolog provides velocity levels to an ISO standard, in either mm/sec (rms) or in./sec (equivalent peak) modes.

SEE is a new acoustic emissionmonitoring technique that detects early bearing defects, lubrication problems due to contamination or breakdown, and fretting. It detects high frequency emissions in the 250,000 to 350,000-Hz range.

Picolog can also be linked, through a PC, to Prism2 Jr., a predictive- maintenance software package that processes the collected data and displays it in chart form. Data displayed includes a historical record of machine conditions and projections of measurement data. In this way, the software warns the user of potential machine problems and predicts when measurements will reach unacceptable levels.

SKF Condition Monitoring, San Diego.

Right-angle speed reducers

Combination helical and bevel-gear speed reducers offer energy savings through high efficiency (94 to 96%). Standard Unicase modular units, for either double or triple reduction, are available from 1,500 to 25,000 lb-in. output torque. Backlash of double-reduction units can be controlled down to 30 min. Cast-iron housing mounts vertically, horizontally, or upside down. Mounting options include foot or flange, solid input shaft, or NEMA C-face motor. The output shaft can be solid single, double extended, or hollow with torque arm.

Standard Industrial Products Co., Houston.

Liner-type doctor bearing: good medicine for shakes, abrasions

“Simplicity” doctor bearing is for linear and rotary-motion uses as an OEM or replacement component in wet or dry-end paper machine use. The bearing cartridge spreads the internal load to relieve high surface pressures occurring in rolling-element bearings. A liner of Frelon, a Teflon composite, provides low friction and wear, and self-lubrication. The liner can also damp vibration through the bearing before it can transfer to the doctor blade. Lower vibration means fewer web breaks.

According to the maker, the design eliminates shaft tracking and bearing material cold flow. Also, the liner withstands applications where the bearing is immersed. A combination of constant, even pressure, scraping, lubrication grooves, and a double-lip seal keeps dirt from entering and damaging the shaft.

Sizes can be as large as 13-in. length; 1-ft OD, and 81/2-in. ID.

An optional induced-lubrication assembly applies oil from a reservoir through a wick. Even if the reservoir is empty, oil in the wick keeps lubricating the bearing.

Pacific Bearing Co., Rockford, Ill.

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Permanent-magnet hysteresis brake

Accu-Torq HT hysteresis brake has neodymium magnets to produce high torque per size. Torque output is comparable to magnetic particle devices according to the manufacturer. A hysteresis brake uses a magnetic field to produce torque. The absence of friction surfaces makes for long life.

Permanent magnets mean no power supply is needed. Torque is infinitely adjustable between maximum and minimum by rotating one end of the brake with respect to the other, thus varying magnetic field intensity and, therefore, brake torque.

Three standard sizes are 1.3 to 3.3-in. OD, with torque from 1/2 to 26 lb-in.

Accu-Clutch Co. Inc., Columbia, Conn.

Geared ac servomotors offer wide ranges of speed & torque

F Series of six geared servomotors has oillubricated planetary gears with counterclockwise output shaft rotation. Input speed is 1,500 rpm. Reductions of 9:1 to 80:1 are available. Output torque ranges from 18.4 lb-ft at 222 rpm for the smallest motor to 1,570 lb-ft at 25 rpm for the largest. Foot mounting is standard; flange mounting, optional. F Series motors are for machine-tool feeds, carrier machines, and press feeders.

M Series of eight geared servomotors also provides reductions ranging from 9:1 to 80:1 in six steps. Input speed is 1,000 rpm. Output torque ranges from 18.4 lb-ft for the smallest motor to 3,177 lb-ft at 18 rpm for the largest. M Series is for machine- tool feeds and transfer machines.

R Series of five comes in reductions of 5:1, 10:1, and 25:1. With 3,000-rpm input speed and 5:1 reduction, the gearmotor supplies 90 oz-in. torque. Using the 25:1 reduction, the largest motor provides 1,805 oz-in. torque. R Series is for robot wrists and XY tables.

Yaskawa Electric America Inc., Northbrook, Ill.

Spring-engaged brake for heavy work

Torque is adjustable on all DSB and QSB 1200, and QSB 2000 spring-engaged and electromagnetically released brakes. The DSB 1200 is for applications in the 6,000 to 10,000 lb-in. range; the QSB 1200, 10,000 to 25,000 lb-in.; and the QSB 2000, 38,500 to 52,000 lb-in.

Spring-engaged brakes are used to stop loads when the brake is to be on for long periods, where braking is required when power fails, in emergency-stop situations, and in applications where large loads must be held in place.

Purolator Products Co. Inc., Elmira, N.Y.

High-torque, low-speed synchronous gearmotor

By combining its “D” gearhead and 23T low-speed synchronous motor, the manufacturer created its HY-Sync low-speed parallel-shaft gearmotor line. The line covers fast and frequent start-stop applications that can accommodate actuators, positioning and holding devices, and clutch-brake substitutes. The gearmotors are in stock in seven gear ratios in a range of 3.6:1 to 180:1.

Other features include output speed of 0.4 to 20 rpm, torque to 40 lb-in., startstop action in 5 to 25 msec, and no significant current rise during start.

Bodine Electric Co., Chicago.

Electronic gage reads bores fast

You can measure bores, grooves, and minimum wall thicknesses quickly with 650 and 654 Series electronic gages. They are direct reading, with spring-loaded contact arms, and are dust and splashproof. Gage output is RS232-compatible.

Dyer Co., Lancaster, Pa.

Miniature BLDC motor can run at 100,000 rpm

Second-generation Size 5 (1/2-in. diameter) brushless dc motor is well-suited to medical, commercial, and aerospace uses. It can operate at speeds to 100,000 rpm, providing high peak power for difficult operations like cutting into bone. The increased peak power lets you maintain good speed control with higher loads in forward and reverse.

The hollow shaft lets fluids pass easily, providing a path for irrigation when needed. Construction is all stainless steel. Windings can withstand autoclaving temperatures.

Transicoil Inc., Medical Products Div., Valley Forge, Pa.

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Nonmetallic bearings can slip right in

Self-lubricating, nonmetallic bearings in both inch and metric sizes can interchange directly with powdered metal and steel or fiber-glass-backed PTFE-lined bearings. They come in bores of 1/8 to 1 in. and 3 to 25 mm in sleeve and flanged styles. The bearings are particularly useful in low to medium-load applications, in linear, oscillating, or rotary operation.

Maximum PV is 10,000; continuous operating temperature, 240 to 240 F.

PIC Design, Middlebury, Conn.

Multispeed ac motors

Induction motors for 3,600 and 7,200 rpm operate 60-Hz, three-phase power. The only “black boxes” needed are conventional switchgear. Motors have the same general characteristics as ordinary induction motors, except that there are two windings. The photo shows 1, 20, and 50- hp, two-speed units.

The concept also permits 3 and 4- speed units, for example: 2,700, 3,600, and 4,200-rpm motors, and 1,200, 2,400, 3,600, and 4,200-rpm motors.

NCS Inc., Celina, Ohio.

Electrical multiple-disc brake: torque tightly packaged

Maxitorq Series EMB electrical multipledisc brakes produce three to six times the torque of single-plate brakes of the same diameter, according to the manufacturer. Static torque range is 30 to 1,050 lb-ft in 3.5 to 8.5-in. diameters.

The drive cup is designed into the coil housing, which reduces cost and axial space requirements and simplifies installation. Most of these brakes are used in oil but, in some applications, they can be used dry.

Carlyle Johnson Machine Co., Manchester, Conn.

Washdown brakes come in C-face and close-coupled styles

Four series of electric brakes meet BISSC and AAA Dairy standards, and other food industry washdown requirements. Torque ratings are 11/2 to 105 lb-ft. The brakes include 55,000 and 55,700 Series as well as 87,000 and 87,700 Series, covering 56 through 250-frame motor sizes. The 55,700 and 87,700 are double C-face coupler-brakes; the other two, close-coupled designs that mount on the motor end bell.

Stearns Div., Rexnord Corp., Milwaukee.

BLDC motors to 600 hp

The 500AT NEMA frame extends the manufacturer’s brushless dc motor line continuous power ratings to 600 HP at 1,750 rpm. Basic frame diameter is about 25 in. (12.5-in. shaft height).

Construction is all cast-iron. Enclosure ratings include DPBV, DPSV, DPFG, TENV, TEAO, TEPV, TE Liquid Cooled, and MSHA TEXP. Base speeds are 300 to 1,750 rpm; continuous torque ratings, 750 to 1,800 lb-ft; and typical motor full-load efficiency, 97%.

Powertec Industrial Corp., Rock Hill, S.C.

Snap-fit conduit protectors make cable access easy

E-Tube family of modular conduit protectors is of snap-together design for rapid maintenance of cables and hoses. Requiring no special fastener, each link snaps open from top and bottom, allowing immediate access. The carriers are of a lightweight, nonconductive, corrosion-resistant nonmetal. They are available from stock in four inner heights — 1.25, 1.70, 2.20, and 3.15 in. — and seven widths, and they can serve for applications requiring travel to 450 ft, and for up to six bending radii.

Igus Inc., East Providence, R.I.

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Servo-duty gearbox

A low backlash (1 to 2 arc min) gearbox, the S Eliminator, comes in six standard sizes to handle continuous motor input torques ranging from 10 to 400 lb-in. and output torques from 140 to 5,200 lb-in. Standard ratios are 5:1, 10:1, and 20:1, with other ratios available up to 80:1. Units have adapter flanges to handle most servomotors. There is also an inputshaft version that can be used with a timing- belt input or direct-coupled to a basemount motor.

Peerless-Winsmith Inc., Springville, N.Y.

Conveyor belt fasteners

Staple-attached, hinged conveyor-belt fasteners offer longer splice life than conventional hook or tooth-type belt lacing, according to the manufacturer. Applied with a hammer and portable installation tool, the staples pass through the belt without severing cross fibers. Plates prevent the belt from flexing at the point of fastener attachment and enable smooth operation on pulley diameters as small as 2 in. Fasteners are available in four sizes for belt thicknesses from 1/16 to 5/16 in.

Flexible Steel Lacing Co., Downers Grove, Ill.

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