Tips to obtain the best results from your pulleys
Extended useful life for the belts. Less wear for the grooves. Operation without vibrations.
- How can the manufacturing process aid in the prosecution of the above benefits ?
La excentricidad y el desbalanceo son las principales causas que nos impiden lograr buenos resultados. Otro problema importante es el desgaste de los canales.
- How can this be avoided?
The eccentricity is determined at the very moment in which the central hole is bored and machined. The part should be mounted on the lathe and centered by means of a Needle comparator, measurements being taken on the groove dressed. Surface devoid of uneven painting. We recommend to center the pulley with a difference not greater than 5 lines, that is 0.05 mm, in one turn. Thus, the hole will remain centered as referenced to the grooves and the belt.
Another cause for eccentricity is an oversized gap between the shaft diameter and the hole. The difference between both diameters must not surpass 0.02 mm, that is 2 centesimi. Should this measure be surpassed, the grooves where belts slide will become eccentric and vibrations will increase, whenever the set screw is tightened
Unbalce:
Once the hole is bored, it is necessary to keep the part balanced. If it were necessary to lay set screws, distribute them evenly. In case the casting had a rib in the area occupied by the set screw and the key, the weight of said rib should also be balanced. If the part is to turn at speeds faster than 500 rpm, the assembly should be dynamically balanced. This operation will.
Groove wear:
The belt should never be allowed to come into contact with the groove bottom. Otherwise, the contact surface and the tension will decrease and the belt will deteriorate at a fast rate. Try to control the belt position from time to time. If there were more than one belt, make sure that their ridges are evenly laid so that some of the belts do not slip. Should the groove wear -as referenced to the belt- surpass 0.8 mm, replace.