Hello,
Well, I disagree, but I am certainly not alone. Here's a quote from another post, but others can also be found that offer empirical data contrary to any notion that belts do not stretch, or to the concept that they by default drive perfectly and do not creep, which is yet another artifact of belt drives. How the effect is handled is left in the hands of the turntable's designer, and certain implementations can be applied that lessen the effect, but it does exist. Some designers do a great job overcoming the issue, but others fail. Such is the lot of turntable design, but we already know that.
"A propos of nothing in particular except that I came up with a neat proof of the existence of belt creep from first principles, namely the conservation of mass.
1. To transmit torque between the pulley and the platter the belt must have higher tension on the drive side than on the non-drive side.
2. Tension on the belt will cause it to stretch and simultaneously thin slightly, so the belt on the drive side has less mass per unit length than on the non-drive side.
3. The amount of mass per unit time passing any two points must be equal.
4. Mass per unit time = mass per unit length x speed so the speed of the belt on the drive side must be greater than the speed on the non-drive side.
5. This speed difference exists either side of the drive pulley so the belt must creep over the length of the contact patch to make up that speed difference."
Posted on another forum by Mark Kelly
Best,
Win
.
Well, I disagree, but I am certainly not alone. Here's a quote from another post, but others can also be found that offer empirical data contrary to any notion that belts do not stretch, or to the concept that they by default drive perfectly and do not creep, which is yet another artifact of belt drives. How the effect is handled is left in the hands of the turntable's designer, and certain implementations can be applied that lessen the effect, but it does exist. Some designers do a great job overcoming the issue, but others fail. Such is the lot of turntable design, but we already know that.
"A propos of nothing in particular except that I came up with a neat proof of the existence of belt creep from first principles, namely the conservation of mass.
1. To transmit torque between the pulley and the platter the belt must have higher tension on the drive side than on the non-drive side.
2. Tension on the belt will cause it to stretch and simultaneously thin slightly, so the belt on the drive side has less mass per unit length than on the non-drive side.
3. The amount of mass per unit time passing any two points must be equal.
4. Mass per unit time = mass per unit length x speed so the speed of the belt on the drive side must be greater than the speed on the non-drive side.
5. This speed difference exists either side of the drive pulley so the belt must creep over the length of the contact patch to make up that speed difference."
Posted on another forum by Mark Kelly
Best,
Win
.