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• Single Treadle vs. Double Treadle
• Single Drive vs. Double Drive
• Tensioning System: screw, tilt, other
• Size of wheel, Ratios

• In single drive, your drive band is directly contacting either the flyer or the bobbin,
• In double drive, your drive band is contacting both flyer and bobbin
• In single drive, the difference in rotational speeds of the bobbin and flyer is caused by a brake band on one or the other.
• In double drive, the difference in rotational speeds is dictated by the difference in diameter of bobbin and flyer pulleys.

Single Drive

• Flyer –lead:  driveband moves the flyer, brakeband on the bobbin
• Bobbin-lead: driveband moves the bobbin, brakeband on the flyer

Double Drive

• Driveband makes two loops, one around flyer pulley, and one around bobbin pulley.

• Screw
• Tilt
• Other

Your foot works the treadle
The treadle moves the footman
The footman turns the wheel crank
The wheel turns and engages the drive band
The drive band transmits rotational force to either the:

• Flyer in a single drive scotch tension system, or
• Bobbin in a single drive, irish tension system, or
• Both in a double drive system.