[three] The V-belt must be very rigid within the pulley's axial path to generate only shorter radial actions even though sliding out and in with the pulleys. Some drill presses and milling devices have an easy belt-generate CVT method to regulate the velocity with the spindle, including the Jet designs https://gearbox-cvt08405.bloggosite.com/41096254/the-2-minute-rule-for-gearbox-cvt