Harvey Alpha Series Table Saws: Wormgear and Dovetail Trunnions Explained

Created by Gabriel Izzo, Modified on Wed, 27 May at 4:25 PM by Gabriel Izzo

Harvey Alpha Series Table Saws · Design & Engineering

Wormgear & Dovetail Trunnions Explained

Overview

The HW110LC (2HP) and HW110TC (3HP) table saws use a worm gear trunnion design, while the HW110S (4HP) models feature a more robust dovetail trunnion system. Understanding the difference helps explain the performance characteristics of each saw.

Trunnion Designs by Model

Worm Gear Trunnion

HW110LC (2HP)

HW110TC (3HP)

The arbor assembly pivots from a single hinge point as the blade is raised or lowered.

This creates a slight arc or "swing" in the arbor path during height adjustment — a characteristic of worm gear elevation systems.

Dovetail Trunnion

HW110S (4HP)

The arbor moves strictly vertically within precision-machined dovetail tracks at both the front and rear of the trunnion.

No arc or swing — radial blade movement during height adjustment is eliminated entirely.

Key Difference — Why It Matters

The primary advantage of the dovetail trunnion over the worm gear system is the elimination of radial blade movement during height adjustments. In worm gear systems the arbor pivots from a single hinge point, producing a slight arc as the blade travels. The dovetail system constrains the arbor to strictly vertical travel in precision-machined tracks front and rear — resulting in more consistent blade geometry at every height setting.

Benefits of the Dovetail Trunnion (HW110S)

Increased accuracy in blade height adjustments

Improved lateral rigidity and less vibration of the arbor assembly

No hinging motion — greater stability and repeatability during the cut

Ideal for users prioritizing precision, repeatability, and long-term structural integrity

Worm Gear Trunnion — HW110LC (2HP) & HW110TC (3HP)

Worm Gear Trunnion Design — HW110LC / HW110TC

Worm gear trunnion design on the HW110LC 2HP and HW110TC 3HP table saws

Dovetail Trunnion — HW110S (4HP)

Dovetail Trunnion Design — HW110S 4HP

Dovetail trunnion design on the HW110S 4HP table saw