PRT2 No. 3 Load Life Information
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This data sheet interacts with No. 3 Load Life Information The load capacity and life expectancy of HepcoMotion ring slides, segments and track systems is determined by many factors including the ring size, the type and number of bearings, the presence of lubrication, the magnitude and direction of loads, the speed and the distance travelled. It is usual to run systems at much less than the maximum load to prolong life, which can be calculated using the data and formulae in this datasheet. For calculation purposes, systems fall into two categories, those where a carriage runs on a ring slide, segment or track system and those where a ring slide is captivated and rotates in a number of bearings (or the similar arrangement where the ring slide is stationary and the bearings and load rotate). Where possible, systems should be oiled using Hepco lubricators 52. This will greatly extend system life. 37 of the PRT2 catalogue and/or the bleed lubrication system Systems with carriages When calculating the life, first the load on each carriage should be resolved into the direct load components L1 and L2 and moment load components M, Mv and Ms. Carriage Load Capacities Capacities are shown for both 'dry' and 'lubricated' conditions - this refers to the bearing and slide 'V' contact, since all bearings are lubricated internally for life. Values are based on shock-free duty. Dry System (Twin and DR Type Bearings) Lubricated System (Twin Type Bearings) Carriage Part Number Lubricated System (DR Type Bearings) The L 2 & Mv load capacities for carriages using floating bearings 36 of the PRT2 catalogue are the same as is shown above for DR bearings. The L1 & Ms load capacities for carriages using floating bearings are zero (they are free to float in these directions). Please note that bogie carriages (BCP) are not available with floating bearings.

No. 3 Load Life Information To determine life, calculate the load factor LF using equation [1] below, then use equation [3] or [4] to determine life for the system. Ms Mv M + + Ms(max) Mv(max) M(max) Notes: 1. In heavily loaded bogie type carriages, the bogie swivel bearings can affect life. Applications for bogie carriages in which L F is more than 0.5, calculated using the *1 load figures from the table see page 1, should be referred to Hepco to confirm suitability. 2. When calculating L 2 and Ms loadings, the centrifugal force must be included which acts radially outwards from the centre...

No. 3 Load Life Information Notes: 3. In some applications where the bearings rotate with the load, it may be beneficial to distribute the bearings unequally around the ring. Contact Hepco for application advice. 4. SPEED OF OPERATION. Hepco ring slides, segments and track systems are rated for speeds of 1m/s without lubrication or 5m/s when lubricated, but take care to allow for intertial loads. Greater speeds may be tolerated at reduced loads. Contact Hepco for details. 5. SHORT STROKE OPERATION. If the stroke length is less than five times the bearing outside diameter, then calculate the...

No. 3 Load Life Information Example 1 A track system consists of: 1 x TR44 468 R180C; 1 x TNM44 B870 2 x AK; 1 x TR44 468 R180C; 1 x TNM44 B870 2 x AK; 1 x FCC 44 468 LB. The carriage carries a weight such that the mass of the load and the carriage together is a total of 40kg whose centre of mass is over the middle of the carriage. The centre of the mass is 80mm above the slide V’s. The speed of operation is 0.7m/s, and the fixed centre carriage is fitted with lubricators. The load factor can be calculated using equation [1]. Ms Mv M + + Ms(max) Mv(max) M(max) L1 = 40kg x 9.81 m/s2 (g) =...

No. 3 Load Life Information Example 2 An radar antenna is mounted on a HepcoMotion SSRD44 468 L P ring disc, which rotates in 2 off SSRBHJ34CDRNSCHK & 4 off SSRBHJ34EDRNSCHK bearings. The system is lubricated with 6 off LB44F lubricators. The radar antenna rotates once a second and the mass of the rotating assembly (which includes the ring, base and radar antenna) is 15kg. The centre of mass (COM) of the assembly is 150mm from the axis of the ring disc and 200mm above the ring V’s. The system is required to work on average 36 hours per week. The load factor can be calculated using equation...

No. 3 Load Life Information Example 3 A feeding mechanism incorporates an R44 612 R90 double edge ring segment and FCC 44 612 LB DR CHK fixed centre carriage. This mechanism has a paddle which pushes components onto a conveyor via a curved path. The pusher is powered by a rotary actuator which engages on a pin on the centre of the carriage plate, 70mm above the centre line of the V’s. The mass of the carriage assembly is 15kg and the centre of mass is 70mm from the centre of the carriage. When the mechanism is pushing products onto the conveyor, the pushing force Fp is 300N which acts 100mm...

No. 3 Load Life Information Example 4 25 A textile cutting machine uses a HepcoMotion double edge track system consisting of 1 x TR76 799 R180 C; 1 x TNL 76 B2040 - 2 x AK; 1 x TR76 799 R180 C; 1 x TNL76 B2040 - 2 x AK and 1 x FCC 76 799 LB. The fixed centre carriage carries a knife which experiences a resistance force of 250N at a distance of 100mm from the carriage centre, and the blade is offset by 60mm from the centreline of the V’s. The carriage is driven by a timing belt which engages a pin in a yoke on the side of the carriage. The line of force is offset by 110mm from the carriage...

HepcoMotion®, Lower Moor Business Park, Tiverton Way, Tiverton, Devon, England EX16 6TG Tel: +44 (0) 1884 257000 Fax: +44 (0) 1884 243500 E-mail: sales@hepcomotion.com Ref: No.3 Load Life Information 02 UK