If a very accurate stitch penetration is required, it is advisable to run the machine at
reduced speed and to select a V-belt pulley approx. 20% smaller.
approx. 2500 rpm with a 106 mm diameter motor shaft V-belt pulley
approx. 2300 rpm with a 100 mm diameter motor shaft V-belt pulley
approx. 1800 rpm with an 86 mm diameter motor shaft V-belt pulley.