Vein bursting is a common condition. I would recommend that you discuss this with your doctor as it may be a a sign of an underlying disorder that requires treatment. First of all, everyone occasionally experiences veins bursting. This results in an ecchymosis, or a bruise.
Couplings & Flexible Shafts. Couplings are devices used to connect two shafts together and are divided into two categories: Rigid and Flexible. Both are used for the purpose of transmitting power, rigid couplings being more limited in applications as compared to flexible couplings.
Balancing a coupling is putting the center of mass on the center of rotation. There are two main ways a manufacturer can accomplish this. Option #1 â Manufacture using tight tolerances and tight fits. Option #2 â Correct the imbalance after manufacturing by drilling holes in the coupling face.