Timing Belts - Cross & Morse - #39

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table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:6.00pt "Lucida Sans Unicode", sans-serif; } .font1 { font:8.00pt "Lucida Sans Unicode", sans-serif; } .font2 { font:9.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:10.00pt "Lucida Sans Unicode", sans-serif; } .font4 { font:8.00pt "Palatino Linotype", serif; } .font5 { font:9.00pt "Palatino Linotype", serif; } .font6 { font:12.00pt "Palatino Linotype", serif; } .font7 { font:25.00pt "Palatino Linotype", serif; } .font8 { font:10.00pt "Sylfaen", serif; } .font9 { font:8.00pt "Trebuchet MS", sans-serif; } .font10 { font:10.00pt "Trebuchet MS", sans-serif; } Polyurethane Timing Belts Polyurethane Timing Belts are offered in three standard metric pitches, 2.5mm, 5mm, and 10mm, and also standard imperial pitch, V5 (XL). In addition to the standard single sided belts, double sided belts with moulded teeth on both sides of the belt can be supplied (T5 and T10 only) for multishaft, serpentine drives and some conveyor applications.The metric belts are offered in two designs 'T' and 'AT' series both using steel tension cords encased in the polyurethane jacket with integral drive teeth. The method of manufacture ensures close control of pitch length, which combined with the inelastic properties of the steel tension member create a belt drive with high positional accuracy resulting in these belts being popular for instrument drives, robotics, and servo mechanisms. The imperial pitch belts use Kelvar tension members for increased strength and flexibility making them suited to higher power applications. The metric series belts can be also supplied with Kelvar tension member if required. Polyurethane has excellent resistance to mineral oils, greases and many slight acidic solutions, it is basically non marking and resistant to crumbling making it suitable for food and cigerette processing machines, and for paper handling in office equipment. Polyurethane belts can be used on applications with enviromental temperature range -30°C, to 80°C, with belt speed up to 80 m/sec. In addition to the standard belt listed on page 39, open ended belt can be supplied for most constructions and widths, and fitted with welded attachments for conveying applications and positional rack drives, refer to page 45 for further details. The low inertia of the belts and alunimum pulleys plus accurate pitching make both the endless and open ended belt ideal for the high acceleration rates encountered in robotics.The high flexibility of the polyurethane belt enables crossed drives to be achieved (shafts at right angles), where reasonable length centres exist and narrow width belts are used. Both high shaft speeds and power capablities can be achieved with the 'T' and 'AT' series of belts. The T2.5, T5, and AT5 belts are all able to run at up to 40,000 r.p.m with AT5 belts transmitting 15kW The T10 and AT10 belts, can operate to 15,000 r.p.m with power capacity to 70kW and higher powers of up to 200kW can be achieved with 20mm pitch AT 20 belts available to special order. Standard Belt Power Ratings AT Series Polyurethane Timing Belts Polyurethane belts are suitable for drives in a wide variety of machinery including Office machinery, Machine Tools, Pumps, Textile Machinery, Printing Machinery, Paper manufacturers, down to precision Camera drives and servo mechanisms. The 'AT' series of Polyurethane belts have increased tooth width and higher strength tension members than the 'T' Series. The increased tooth size with resultant increased stiffness improves meshing with pulley teeth and enables transmission of higer powers. Increased strength tension members improve pitch accuracy and also increase power capacity. Both improvements result in an increase of power transmission capacity of approx 50%. Quieter operation, as a result of improved tooth meshing, and reduced polygonal effect plus ability to use narrower section belts, is combined with improved positional accuracy of power transmission, with linear accuracy better than ± 0.1mm/Metre belt length. Design limits for standard Polyurethane Timing Belts. O o 5 5 Belt Size Width x Pitch Max. Allowable Belt Tension N. Min. No. Teeth Drive Pulley Min dia of Idler Pulley mm 6T2.5 65 10 15 10T5 330 10 30 16T5 570 10 30 25T5 930 10 30 16T10 1100 12 60 25T10 1800 12 60 32T10 2300 12 60 50T10 3800 12 60 10AT5 490 15 60 16AT5 840 15 60 25AT5 1100 15 60 25AT10 3500 15 120 32AT10 4750 15 120 50AT10 7750 15 120 + 4 5 o to z ce ce LU o D. SHAFT SPEED r.p.m. 37 ^ INDEX BACK NEXT ^