The Jet 708580 Benchtop Mortise Machine, 1/2" Capacity, 1/2HP, 1725 RPM is a compact shop mortiser built for woodworkers who want cleaner, faster mortise-and-tenon joinery without wrestling with hand chopping or drill press workarounds. This is a benchtop mortiser designed for cutting square mortises for mortise-and-tenon joinery. Model Number JBM-5. If you build furniture, doors, frames, or other projects where strong wood joints matter, this machine gives you the control and repeatability that make the job go smoother.

On the working side, the 1/2 horsepower motor, 6-amp draw, and 1725 RPM spindle speed are matched to the kind of cuts this machine is built to make. That matters because a mortise machine is not about raw speed alone. It is about controlled power, smooth feed, and keeping the chisel and bit moving cleanly through the stock. With a 1/2 inch mortising capacity and a three-jaw chuck that accepts bits with up to 3/8 inch shanks, this Jet mortiser covers the size range many furniture makers and cabinet shops use most often.

The layout is practical. Jet uses heavy-duty cast iron and steel construction to keep the machine planted and stable, and that shows up where it counts: less flex during feed pressure and better consistency from piece to piece. The rack-and-pinion head adjustment gives you accurate position control when setting up the cut, which is a big improvement over fighting a less precise setup. The long, multi-position mortising handle is another smart touch. You can reposition it for a more comfortable feed angle, which helps when you are running several identical joints and do not want awkward body position slowing you down.

For repeat work, the quick-adjust depth stop is one of the features that actually saves time instead of just sounding good on paper. Once you have the depth where you want it, you can produce matching mortises across rails, stiles, legs, or aprons without constantly resetting and checking. That is especially useful in furniture making and cabinet work, where joints need to line up cleanly and assembly goes sideways fast if one part is off.

Jet also built in a few details that make setup and maintenance less annoying. The two hinged side doors give you easier access to the drill chuck for bit changes, which is a lot better than digging around in a cramped space. The column is reversible for mortising larger stock, so you have more flexibility when a workpiece does not fit the standard setup. There is also a removable on and off toggle switch, which helps prevent accidental or unauthorized use in a shared shop or garage.

In terms of footprint, this is a benchtop machine, not a floor-standing production mortiser. That is the point. It gives serious woodworking capability without taking over the shop. At roughly 52.45 pounds, it has enough mass to feel substantial on the bench while still being manageable for smaller shop setups. It runs on standard 115-volt single-phase power, so it is easy to place in a home shop, school shop, or light professional workspace without special wiring.

If you are the kind of user who regularly cuts mortises for tables, chairs, face frames, doors, or custom built-ins, this machine makes a strong case for itself. It is best for woodworking, furniture building, cabinetry, and small shop production where repeatability matters more than brute industrial scale. If you only cut an occasional joint once in a while, a mortising attachment or router jig may get by. If you do this work often and want faster setup, better control, and more consistent results, the JET JBM-5 is the smarter move.

Jet 708580 Benchtop Mortise Machine, 1/2" Capacity, 1/2HP, 1725 RPM for woodworkers who want repeatable joints without a giant machine

This is the kind of benchtop mortiser that makes sense when you build real projects and want dependable mortise-and-tenon results without stepping up to a full floor model.

• Who it's for: Woodworkers, furniture builders, cabinet makers, and serious DIY users who cut mortises often enough to want better speed and repeatability than router jigs or drill press setups.
• Why it stands out: The cast iron and steel build, rack-and-pinion head adjustment, reversible column, and easy chuck access are the features that actually matter once you start using it.
• Worth knowing: This is a compact bench machine, not a production floor mortiser, but for most small and mid-size woodworking shops that is exactly why it is such a smart buy.

• What kind of tool is this? This is a benchtop mortiser used to cut square mortises for mortise-and-tenon woodworking joints.
• What is the maximum mortising capacity? The machine is rated for 1/2 inch capacity.
• What shank size does the chuck accept? The three-jaw chuck holds mortising bits with up to 3/8 inch diameter shanks.
• What power does it require? It runs on 115-volt, single-phase power and uses a 1/2 horsepower motor rated at 6 amps.