500 Series Select-Rip Saws

Specifications

Machine type	Select-Rip (shifting / moving blade) gang rip saw — glue-joint accurate
Models	512-DC/SR (12″), 524-DC/SR (24″), 531-DC/SR (31″), 540-DC/SR (40″); NEW two-arbor 524 (edge + rip)
Rip width capacity	12″, 24″, 31″, or 40″ (by model)
Shifting saws	One to four shifting blades with optional center fixed blade and outboard TwistLock fixed blades; 1″ min. net rip between shifting saws
Stock thickness	To 2-1/2″ using 14″ dia. tooling (524)
Minimum length	22″ bust-up / 30″ glue-joint (524)
Arbor motor	Direct-drive 75 HP, 3,600 RPM TEFC (no belts to tension)
Feed drive	5 HP with VFD, infinitely variable, 30–235 FPM
Feed bed	Posi-Feed friction bed — aluminum slats with replaceable steel-backed rubber inserts on DOUBLE-VEE hardened chains; oil-mist lube with low-oil auto shut-off
Hold downs	Four 4″ dia. air-loaded press rolls (up to 1/2″ thickness variation); air-loaded traveling shoes per shifting blade; heavy-duty pressure head on cast-iron “U” column
Safety	UL & C-UL rated cabinet; four rows of anti-kickback (single lower / double upper infeed, single upper outfeed); arbor motor brake & rotation sensor; mechanical & electrical door interlocks
Dust collection	One 10″ + one 5″ upper, one 5″ lower — 4,060 total CFM (524)
Electrical	3/60/230 or 460 V (other electrics available)
Optimization	Integrates with Rip Navigator Scout — board scanning, production & vendor reporting
Construction	Modular, with replaceable steel-backed rubber inserts
Shipping / weight	Nominal 8′ × 6′ × 6′ skid, 9,500 lbs (4,300 kg) (524)
Country of origin	Made in the USA — Mereen-Johnson (Minneapolis, MN)

How the 500 Series Select-Rip Gang Saw Works

A Select-Rip gang saw sets several saw blades on one arbor — but unlike a fixed-arbor gang saw, some of those blades shift to match each board:

1. Shift the blades. One to four moving saw blades shift on the arbor to each board’s optimal rip pattern, with an optional center fixed blade and outboard TwistLock fixed blades completing the setup — recovering usable width down to a 1″ minimum net rip between shifting saws.
2. Feed with glue-joint accuracy. The Posi-Feed high-friction feed bed and DOUBLE-VEE chains carry each board with positive containment, while air-loaded press rolls and traveling shoes (one per shifting blade) hold it for a straight, glue-joint-accurate cut. Multiple shifting saws mounted from a heavy-duty overbeam keep the cut true.
3. Power through. A direct-drive 75 HP arbor motor — no belts to tension or replace — rips at feed speeds from 30 to 235 FPM.
4. Optimize with the Scout. In the 524-DC/SR4 configuration, the Rip Navigator Scout scans each board and drives the shifting blades to the highest-yield or highest-value solution — turning the gang saw into a full optimizing line.

As a moving blade gang saw, the 500 Series gives you the throughput of gang ripping with the yield of board-by-board optimization — flexibility a fixed-blade saw can’t match.

Applications

The 500 Series Select-Rip gang saw fits operations where yield and flexibility drive profitability:

• Value & width optimization — shifting blades recover the most usable width, or the highest part value, from each board.
• Edging + ripping (two-arbor 524) — edge lumber on the first arbor and precision-rip on the second in a single pass.
• Moulding stock — random-width solid lumber and blanks.
• Dimension & S4S parts — precision components and re-ripping for salvage and reclaim.
• Edge-glued panel stock — glue-joint-accurate strips for panel glue-up.

As a four blade rip saw with optional fixed blades, the 524-DC/SR4 handles a wide mix of parts without the changeover of a fixed-arbor saw.

Industries Served

The 500 Series supports high-production solid-wood operations across:

• Furniture — dimension components and edge-glued panel stock.
• Cabinetry — S4S blanks, face-frame, and door stock.
• Mouldings — random-width solid lumber and blanks.
• Flooring — solid hardwood strip ripping.
• Doors — component and panel stock.
• Rough Mill — cut-first and value-based recovery.
• Custom Millwork — flexible, high-yield ripping for varied stock.

Emerging applications: mass timber and engineered-wood glue-ups, where accurate, high-yield edges feed large, high-strength panels.

Frequently Asked Questions

What is a Select-A-Rip gang saw?

A Select-A-Rip gang saw mounts several blades on one arbor and shifts some of them to match each board — recovering usable width a fixed-arbor gang saw would lose as edgings. The Mereen-Johnson 500 Series is a Select-Rip gang saw with up to four shifting blades.

What is a “moving blade” or “shifting blade” gang saw?

It’s a gang rip saw whose blades reposition (shift) for each board instead of cutting at a single fixed spacing. Shifting the blades adapts the rip pattern to each board’s width, maximizing yield and part value.

How many blades does the 524-DC/SR4 have?

Up to four shifting saw blades, with an optional center fixed blade and outboard TwistLock fixed blades — the four blade rip saw configuration — with a 1″ minimum net rip between shifting saws.

How is the 500 Series different from the 400 Series?

The 400 Series is a fixed-arbor gang saw — blades set at fixed spacings for the highest-volume, set-width ripping. The 500 Series is the Select-Rip version — its shifting blades adapt to each board for maximum yield and flexibility.

What does the two-arbor 524 do?

The new two-arbor Model 524 edges lumber on the first arbor and precision-rips on the second in a single pass — combining edging and ripping in one machine.

How does it optimize yield?

In the 524-DC/SR4 configuration it pairs with the Rip Navigator Scout, which scans each board for width, length, and crook and drives the shifting blades to the highest-yield or highest-value solution.

What sizes and power?

Width capacities of 12″, 24″, 31″, and 40″; a direct-drive 75 HP arbor motor; feed speeds from 30 to 235 FPM; stock up to 2-1/2″ thick (524).

Is it made in the USA?

Yes. The 500 Series is designed and built by Mereen-Johnson in the USA, with a UL / C-UL rated electrical cabinet.