MR-90 Gang Rip Saw

The Diehl MR-90 is an undercutting gang rip saw built to rip short stock that dip-chain saws can’t handle. As an undercutting rip saw, the arbor sits below the table and the blade cuts upward while powered top rolls hold and drive each board — so a short stock gang rip saw like the MR-90 can rip pieces as short as 8″. Its heavy-duty roll feed also costs less to run than a dip-chain feed, delivering dependable, high-production ripping at a lower total cost of ownership.

The Diehl Machines MR-90 is an undercutting roll feed gang rip saw. The roll feed design reduces operational costs when compared to the dip chain feed system and can rip stock as short as 8”.

MR-90.pdf

Specifications

A Gang Rip Saw with Superior Efficiency

The Diehl MR-90 comes standard with four upper powered corrugated feed rolls and two lower non-driven bed rolls providing a dependable and positive feed system for the most demanding applications. The lower wooden saw insert supports the stock on both sides of the blade as it is being cut. All Diehl MR-90 machines also include: an outboard bearing for the saw arbor, a pivoting side guard mounted on the feed roll housing, upper and lower anti-kick back fingers and a manually activated arbor brake.

An additional center feed roll can be added for ripping short length stock. The center roll uses a removable sleeve to mount spur drive discs, wooden rolls (shown above) or urethane feed tires. This option accommodates ripping stock as short as 8” long.

Automation & Robotics

Tailored Solutions for the Solid Wood Sector

Mereen-Johnson stands at the forefront of delivering cutting-edge automated handling solutions that will streamline your workforce and wood machinery assets. Our smart, automated handling solutions are meticulously crafted to enhance your machine throughput and efficacy while substantially trimming your labor expenses.

Our complete spectrum of services ranges from conceptualization and design of production lines to installation, personnel training and ongoing maintenance, and we cater to a wide array of client requirements, offering both standardized system solutions and fully personalized options to suit your specific needs.

Learn More

The Mereen-Johnson Difference

Made in the USA Quality

Vertically integrated manufacturing in the USA means we control every step of the process to deliver the performance and longevity that the industry has grown to expect from us.

Turnkey Custom Solutions

Listening to your specific needs, we will adapt a standard machine or develop a fully custom solution, including automation and robotics, and manufacture it in-house.

Excellence Under One Roof

Our state-of-the-art production space has room to build, test and prove large-scale design solutions. Design-build teams work together to make your custom concept a reality.

Parts, Service & Training

We will always support your machine. From training programs to replacement parts, schematics to software support, we’ve got you covered, remotely or onsite.

Learn More

How the MR-90 Works

The MR-90 replaces the dip chain of a conventional gang rip saw with a positive roll feed and an undercutting arbor — the combination that lets it rip short stock:

Grip & drive. Four upper powered corrugated feed rolls grip each board from above and drive it through, while two lower non-driven bed rolls support it — a positive feed that holds even short pieces securely, with no chain gaps to fall into.
Undercut. The saw arbor sits below the table and the blade cuts upward through the stock, with an outboard bearing supporting the arbor for accuracy under load.
Support at the blade. A lower wooden saw insert supports the stock on both sides of the blade as it’s cut, keeping short pieces steady for a clean rip.
Go shorter (optional). An added center feed roll — with a removable sleeve for spur drive discs, wooden rolls, or urethane feed tires — fills the gap to rip stock as short as 8″.

Because it feeds on rolls instead of a dip chain, this undercutting gang saw costs less to run and maintain — and handles the short lengths that keep other gang saws idle.

Applications

The MR-90 is built for short-stock and cost-sensitive gang ripping:

Short-stock ripping — pieces as short as 12″ standard, or 8″ with the optional center feed roll.
Cut-first & recovery — breaking down short or reclaimed material into usable strips.
High-production gang ripping — dependable roll feed at 50–150 FPM.
Low-cost operation — roll feed avoids the wear and maintenance of a dip-chain system.
Remanufactured value option — factory-rebuilt MR-90s with new-machine features and a new-machine warranty.

As a short stock gang rip saw, the MR-90 fills the gap where dip-chain saws lose support — keeping short material in production.

Industries Served

The MR-90 supports solid-wood operations that run shorter stock:

Furniture — short component and blank ripping.
Cabinetry — face-frame and short-part stock.
Flooring — short flooring blanks and recovery.
Mouldings — short moulding blanks.
Rough Mill — cut-first and recovery of short or reclaimed lumber.
Custom Millwork — short, varied stock.

Emerging applications: reclaimed- and recovered-wood operations, where getting usable strips out of short and salvaged material is exactly what the MR-90 is built for.

Frequently Asked Questions

What is an undercutting gang rip saw?

An undercutting gang rip mounts its arbor below the table so the blade cuts upward through the stock, while powered rolls hold and drive the board from above. Because the material is supported right at the cut, it can rip shorter pieces than a conventional overhead dip-chain saw.

How short a piece can the MR-90 rip?

Down to 12″ as standard, and as short as 8″ with the optional center feed roll — which is why it’s used as a short stock gang rip saw.

Why is a roll feed better than a dip chain?

A roll feed grips and drives each board positively with powered rolls, so short pieces stay supported (no chain gaps), and it avoids the wear and maintenance of a dip-chain system — reducing operating cost over the life of the machine.

What are the MR-90’s motor and speed options?

Arbor motors from 30 to 75 HP, a 2 HP feed motor, and variable feed speed from 50 to 150 FPM standard.

What size stock does it handle?

Up to a 12″ cutting width, from 1/4″ thick, using a 12″ saw blade. (Maximum thickness — please confirm against the current spec sheet.)

What keeps the cut accurate and safe?

An outboard bearing supports the saw arbor, a lower wooden saw insert supports the stock on both sides of the blade, and upper and lower anti-kickback fingers plus a manual arbor brake protect the operator.

Can I buy a remanufactured MR-90?

Yes. Diehl offers completely rebuilt MR-90s — sound frames with all-new wear components, contemporary specs, and new electricals — backed by a new-machine warranty, as a lower-cost alternative to a new machine.

Is it made in the USA?

Yes. The MR-90 is built by Diehl Machines, a Mereen-Johnson company, in the USA.

Custom Engineered Machinery

By Machine Type

By Industry

Best-in-Class Mill Machinery

Automation & Robotics

MR-90 Gang Rip Saw

A Gang Rip Saw with Superior Efficiency

Tailored Solutions for the Solid Wood Sector