These old rules of thumb for drive tensioning have outlived their usefulness: It is time to. Tension the drive until you get a slight bow in the slack side when it is running. Press the belt with your thumb until it deflects about 1/2 in. There are 4 I thnk so I'll have to post them separately. Whack the belt with a karate chop, and if it feels firm, the drive is properly tensioned. These attachments were sent to me by a Gates engineer and will provide some useful information. We never experienced that but I'm told that it is fairly common. Gates belt drive systems are not intended for aircraft use. The concern about not enough tension is centered on the belts tendancy to ride up in the grooves causing a kink in the back of the belt and a straight, cross-longitudinal break. Do not use Gates belts, pulleys or sprockets on aircraft, propeller or rotor drive systems or in-flight accessory drives. I definitely concurred with the mechanics that either of these numbers was way too high. The recommended frequency from the mixer manufacturer was 47 hz and from Gates it was 57 hz. (I no longer work in that plant due to budget cuts but understand that they have had several similar failures since I left.) The frequency that they used as a standard was 32 hz. After tensioning and a period of monitoring the vibration, we then measured the frequency of the belt and they started using that as a standard with apparent success. Since ths had been an ongoing problem with about 8-10 failures in the 2 years since they had started using the sonic tensioning method, they decided to go back to using the mechanics judgement which had served them so well in the past. Their overhung load calculations closely matched mine which greatly exceeded the gearbox manufacturers. I contacted Gates directly and had their engineers perform all the overhung load calculations and make their recommendations regarding belt frequency and they came up with an even higher number. Gates energy efficient synchronous belts will improve your uptime. I had them take the reducer out of service and found that the inner bearing of the low speed shaft was being ground to powder. From energy efficiencies to ROI, our industrial calculators show how much time. Shortly thereafter, I began to measure harmonics of the concentric shaft gear reducers output shaft speed with some ugly impacting. and the mechanics were commenting that the belt seemed way too tight but did as they were instructed and cranked it down until the proper frequency was measured with the sonic belt tensioner. In one case on 8 large mixers this method was being performed exactly to the mixer manufacturers specs. Delivered Duty Unpaid (DDU) is an international trade term meaning the seller is responsible for ensuring goods arrive safely to a destination the buyer is responsible for import duties.Be very careful using the sonic tensioner particularly when it comes to non-catalog belt drives. All items shipped outside of the UK are sent DDU.This is the time stated by the Royal Mail before being able to make a claim for a missing packet & that the packet should of been delivered in that given time. Royal Mail says that you should wait up to 15 BUSINESS days before making a claim for a missing packet. For international delivery please allow up to 28 days before contacting me. All items are shipped within one/ two business day of ordering I can not control the item once it has left me if it has been sent via the post as there is no tracking for the packet but if the item is undelivered it should come back to me as their is a frank with our returns address on it. If you have not received your packet please contact your local postal sorting office as your item may be there. All items are sent via courier or second/ first class post unless they are going outside the UK.This is primarily down to not being able to source the item you have ordered. From time to time there may be occasions when I will have to cancel order due to fulfillment issues.Couriers we use are Royal Mail, Parcelforce, Myhermes, TNT, DPD, UPS & UK Mail.However if this is not possible due to reasons beyond our control we will aim to dispatch as quickly as possible. In smaller minimum plain bore style pulleys, keys are not used. Tables containing these recommended fit tolerances are available in any of the Gates Synchronous Belt Drive Design Manuals. We aim to ship all UK orders within 1-2 days of order. Interference fit tolerances for a range of shaft sizes are also published by Gates.Saturday Delivery: Available upon request.Heavy Item/Dangerous Goods Charge: £6.50.Scottish Islands, Highlands & Northern Ireland (Approx 2-3 days): £15.00.CHEK N ' CHARGE CLASS 9- ELECTRICAL AND SCIENTIFIC APPARATUS FOR CALCULATOR SOLD. Pre-10.30am Mainland UK Only: Available upon request CLASS 17 - RUBBER GOODS FOR POWER TRANSMISSION BELTS MADE PREDOMINATELY.Pre-12.00am Mainland UK Only: Available upon request.Next Working Day Anytime Mainland UK Only: £10.00.Standard delivery on all UK orders (Approx 1-3 working days) £3.50.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |