Products Drives, controls & transmissions When worn transmission chain sprockets need to be replaced
David Turner, of Renold Chain offers the following advice and tips on replacing old sprockets. Sprockets that have worn beyond a certain point will cause rapid chain wear and should be replaced as soon as possible. But how much wear is too much, and what sort of visual checks should be carried out to determine this? Looking at the faces of the sprocket’s teeth will indicate the amount of wear that has occurred. This will be seen as a polished worn strip, about the pitch circle diameter, on each of the teeth as shown in the diagram. If the depth of the wear, X, has reached a value equal to 10 per cent of the dimension Y, then the sprocket has reached the end of its life and needs to be replaced. Low cost, poor quality sprockets on most industrial applications are a false economy. A good quality sprocket should last through the life of several chains before any-
across the machined faces of the sprockets in several dif- ferent positions, if possible, as a check against wobble. Tip: a nylon, or similar line, is a good substitute for a straight edge, particularly for drive systems with long cen- tre distances.
thing like the amount of wear shown here will have occurred. When changing sprockets it’s a good time to check the alignment of both the sprockets and the shafts to which they are fitted. Misaligned sprockets are another factor in premature chain wear. Accurate alignment of shafts and sprocket tooth faces provides a uniform distribution of load across the chain width and contributes substantially to achieving maximum drive life. Use a straight edge
Should end-wise float of shafts be present, make due allowance so that sprocket alignment is correct at the mid position of float. When alignment is correct within closest practical limits, drive the keys home and take a final check on sprocket alignment. If you’re fitting new chain at the same time don’t forget to correctly lubricate it. The lubri- cation on the chain when it comes out of the box is only sufficient to prevent corrosion and aid initial bedding in.
Renold Chain Watertight and corrosion resistant gearhead
Micromech’s corrosion resis- tant and watertight gearhead, said to be the first on the market for any application, is now available.
High-performance economy drives
Motor Technology has a range of high performance, economy class drives from German manufacturer LTi, formerly Lust Technology International. Despite being up to 40 per cent lower in cost than an equivalent high-end drive, LTi’s CDE range is said to offer good performance and functionality. The CDE drive controllers are available in power classes from 375W, 12A up to 110kW, 210A, and can be offered with a wide range of synchronous and asyn- chronous motors. The range of features of the CDE range includes Safe Stop to cat- egory 3 EN 954-1, CANopen, Evaluation of a second encoder, Evaluation of absolute encoders, Sequenced position- ing tasks, PLC functionality, Cam-switch, Online position profile generator and Cam profile function.
Motor Technology T: 0161 2177100 Enter 324
www.motec.co.uk
It combines high per- formance and wide torque capacity with features designed to meet the strict requirements of applications such as food and beverage han- dling, packaging and dispensing. Until now, manufacturers have been unable to use gearheads in many applications which are exposed to harsh environments because there was not a product available capable of withstanding the conditions. The AquaTRUE's IP66/IP67 and IP69K protection (NSF/ANSI 169 Certification) is able to handle caustic cleaning
chemicals as well as high-pres- sure washdown. The gearhead is engineered to be placed any- where in the application design. This eliminates the cost of additional components such as enclosures, shielding or mechan- ical transmissions. The gearhead’s 304 stainless steel housing eliminates the con- cern for rust or any type of corro- sion. It has a laser etched permanent product label and a smooth, round external housing designed without external seams or corners where bacteria col- lects. This makes the AquaTRUE easy to clean and a perfect fit in washdown environments. Micromech T: 01376 333333
www.micromech.co.uk Enter 321
Drive solutions for elevated torque Nord Drivesystems is offering high-performance industrial power
transmission solutions for elevated torque and power ratings. Large-scale gear units from Nord are used in conveying applications for chain or belt conveyors, freight lifts, agitators and many other appli- cations. Complete drive systems are supplied including a motor, brake and clutch. Users can select any standard motor and choose from a range of brake and clutch types. The systems are available with a frame or a swing base. In some applications, industrial gear units from Nord can replace or complement the large-scale gear units. These additions to Nord’s portfolio provide torques between 20,000 and 200,000Nm. Nord is said to be the only supplier to offer industrial gears rated 90,000Nm and above in Unicase housing. This design is said to ensure maximum resis- tance against radial and axial loads, since all bearing seats are integrated into a single- piece gearcase.
Nord Gear T: 01235 534404
www.nord.com
Factory Equipment MAY 2011 T: 01283 512940
www.renold.com Enter 320
New water-cooled motors aid tools
Parker Hannifin, the motion con- trol specialist, has introduced a new range of brushless syn- chronous elec- tro-spindle motors, for use in machin- ing centres, and in milling, turning and grinding applications. Called the HKW series, the new motors feature a water cooled, frameless design and have been developed for high speed machining at up to 50,000rpm. They are rated to 230kW, and can provide high torque at slow speeds and high maximum speeds at constant power. Delivered as separate components, the new HKW range of synchronous electro-spindle motors can be integrat- ed into the mechanical structure of existing or new machines, offering a flexible technology platform with the performance and functionality required to meet the demands of high speed machining applications.
The use of cold permanent magnet technology means that the bearings are subject to less heating than conven- tional induction motors and there is no dilation effect, ensuring a long and reli- able service life. Additionally, HKW motors are smaller and more compact, with greater power density, than com- peting induction motors.
When used as spindle drives, the motors have low levels of vibration, giving the potential for higher quality surface finishing, while reduced axial shaft expansion delivers greater accu- racy and increased bearing life.
Enter 323
Parker Hannifin T: 00800 27275374
www.parker.com
Enter 322 19
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