Bullet by MARSHALLTOWN CenterFire SuperShear Spray Foam Insulation Cordless Open Cell Saw (Bare Tool)

Description

Standard reciprocating blades snag, tear, and gum up when trimming open-cell spray polyurethane foam along wall studs. The Bullet by MARSHALLTOWN CenterFire SuperShear cordless saw cuts insulation batts flush without tearing cellular foam structure. The open blade configuration lacks protective covers, requiring extreme operator vigilance to avoid severe lacerations on finished stud wall bays.

A specialized dual-blade drive mechanism utilizes hardened carbon steel gears that convert motor torque into opposing reciprocating strokes. Counter-acting blade movements cancel out tool vibration, preventing operator arm fatigue during overhead attic passes. Custom-ground serrated carbon steel blade edges feature scalloped tooth profiles that slice flexible polyurethane foam cleanly without generating static-charged airborne dust that fouls jobsite breathing air.

Spray Foam Trimming Drive Metrics

Insulation contractors require flat stud-face trimming without pulling foam beads away from wood framing surfaces. Long balanced blades bridge wide wall cavities without sagging or wandering off the stud line.

• Cordless drive motor interfaces with commercial 18-volt power tool battery platform adapters
• 36-inch counter-reciprocating serrated blades slice open-cell foam flush against structural wall framing
• Opposed blade motion cancels physical recoil to eliminate hand and wrist vibration fatigue
• Scalloped tooth profiles cut cellular foam without throwing fine airborne particles across the workspace
• Cast aluminum drive head houses hardened steel rocker pins that resist lateral blade twist
• Lightweight tubular frame design provides rigidity without bending during deep attic rafter reaches
• Blade guide shoes ride flat along wooden studs to establish true drywall mounting surfaces

Bench Load Telemetry Amperage Draw

Current draw pulls 3.2 amps from the 18-volt DC battery platform during free blade movement. Slicing through dense four-pound open-cell foam brings continuous draw up to 8.6 amps while stroke rate holds steady at 2200 strokes per minute. Blade friction generates negligible heat, with surface temperatures remaining under 95 degrees Fahrenheit. Noise emissions measure 76 dBA, allowing communication inside enclosed building envelopes.

Field Service Trade-Offs Application Filter

Do not use this specialty saw to cut closed-cell two-pound rigid foam, wood framing, or drywall sheets. Hitting hidden drywall screws or steel conduit chips the thin scalloped teeth and bends the guide frame. Wipe foam residue off the blade faces using non-solvent cleaner after each application. Lubricate the opposed blade slide channels with dry silicone spray every four operating hours. Inspect gear case mounting bolts for vibration loosening at the end of each shift.

Warranty Protection Standard Package Items

A 1-Year limited warranty covers mechanical drive components and frame integrity. The bare tool package includes the SuperShear foam saw chassis, one set of 36-inch open-cell cutting blades, blade guide support brackets, battery adapter hardware, and instruction manual.