Powermatic 8 Inch Parallelogram Jointer 2HP 230V Helical Head PJ-882HH Interior Wood Screws Variable speed drive provides stepless

Variable speed drive provides stepless RPM adjustment from 60 to 4

Motor: 5 HP

What is the purpose of the high-low thread design on this screw

Centerline of Spindle to Floor: 44-1/2 in

Powermatic 8 Inch Parallelogram Jointer 2HP 230V Helical Head PJ-882HH Interior Wood Screws Variable speed drive provides steplessThe Powermatic 8" Parallelogram Jointer with Helical Head (PJ 882HH), MPN PM9 1610082, is a professional grade woodworking machine engineered for woodworkers and cabinet shops that demand precision, durability, and superior surface finishes. Built around a parallelogram table design and a helical cutterhead with 54 four sided knife inserts, this jointer delivers quieter operation, an exceptional finish quality, and reliable accuracy that holds up