What Is a Unisaw?

A Unisaw is Delta’s flagship cabinet table saw — the machine that introduced the tilting-arbor design in 1939 and set the template every modern cabinet saw still follows. What separates it (and any true cabinet saw) from a cheaper contractor or hybrid saw is that the trunnions — the brackets the arbor pivots on — bolt to the cabinet itself instead of hanging from the tabletop, which is the main reason cabinet saws hold their calibration and cut more accurately over years of use.

The name still gets attached to a specific, real machine: Delta currently sells the Unisaw as the 36-L336 (and related L-series variants), and the badge on new units still reads “Unisaw Since 1937,” even though most retrospectives peg the commercial launch at 1939 — a small discrepancy that comes up often enough in forums that it’s worth mentioning here rather than picking one date and pretending there’s no ambiguity.

The History, Briefly

The Unisaw originated with the Delta Specialty Company of Milwaukee, founded by Herbert Tautz. Delta introduced it in the late 1930s as what’s generally credited as the first true tilting-arbor cabinet saw — instead of tilting the whole tabletop to cut a bevel (the older approach), the blade itself tilts while the table stays flat. That single change is what made accurate bevel cuts practical on a production saw, and cabinet saws have used the same basic approach ever since.

Rockwell Manufacturing acquired Delta in 1945, and the saw continued production under the “Delta Rockwell” name for decades before the Delta brand was spun off again. Along the way, Delta released a long line of Unisaw models — the 34-450 from the 1950s is one of the best-known vintage versions, and left-tilt models like the 36-845 (a 5HP left-tilt version with a 50″ Biesemeyer fence) came later as Delta modernized the line with the Biesemeyer-style fence system that’s now standard on the current 36-L336.

If you’re trying to date or identify a specific used Unisaw, the model number itself carries information: an “L” means left-tilt (the blade tilts toward the operator’s off-hand side, which most people find safer for bevel cuts), the first number after the letter is usually the motor horsepower, and the last two or three digits typically reference the fence rail length in inches. A 36-L336, for example, is a left-tilt Unisaw with a 3HP motor and a 36-inch Biesemeyer fence rail. It’s a useful shorthand, but Delta hasn’t applied it with perfect consistency across every era, so a serial number lookup (Delta’s own records, or the VintageMachinery.org wiki) is the more reliable way to pin down an exact production year on an older unit.

What Actually Makes It a “Cabinet Saw”

The trunnion mounting is the real technical distinction, and it’s worth understanding because it’s the reason cabinet saws cost more and weigh more than contractor or hybrid saws with similar horsepower:

• Cabinet saw (Unisaw included): the trunnions bolt directly to the closed cabinet base. The tabletop is essentially just a work surface bolted on top — it’s not doing structural work for the blade assembly. That decouples table flatness from blade alignment, which is why cabinet saws tend to hold calibration for years.
• Contractor saw: the trunnions hang from the underside of the table itself, with an open stamped-steel base below. It’s lighter and cheaper to make, but the table has to do double duty as both work surface and structural mount — bumping or flexing the table can throw off blade alignment in a way it can’t on a cabinet saw.
• Hybrid saw: a middle ground — an enclosed or semi-enclosed cabinet like a cabinet saw, but often still with table-hung trunnions internally, aimed at giving cabinet-saw dust collection and looks at a contractor-saw price and weight.

None of this means a contractor saw is a bad tool — plenty of good work gets done on them. It just explains why a Unisaw costs multiples of what a contractor saw does: you’re paying for a heavier casting and a mounting arrangement that’s mechanically more stable, not just for the Delta name.

Who Actually Needs One

A Unisaw makes the most sense if you’re running a saw daily in a fixed shop location and the accuracy has to hold up under that use — cabinet shops, serious hobbyists doing furniture-grade joinery, and small production shops are the classic buyers. It’s a poor fit if you need to move the saw between job sites (it’s a multi-hundred-pound stationary machine, not something you load into a truck each morning) or if your shop space and budget point toward a benchtop or jobsite saw instead.

Basic Maintenance

Keep the table and trunnions free of sawdust buildup — it packs into the tilt and height-adjustment mechanisms over time and makes them stiffer and less precise. A soft brush and occasional compressed air on the underside components goes further than most owners expect. Wipe the cast-iron top with a light coat of paste wax periodically (not oil, which can transfer to and stain workpieces) to keep it from rusting and to help stock glide across it.

Swap the blade before it’s fully dull, not after — a Unisaw’s power makes it easy to keep pushing material through a dulling blade, but that’s exactly when burning, kickback risk, and poor cut quality show up. Unplug the saw before any blade change, and always reinstall the blade guard and riving knife afterward rather than leaving them off “for now.”

Safety Basics

A cabinet saw’s extra power is exactly why the standard table saw safety rules matter more, not less: keep the blade guard and riving knife installed for anything but the rare cut that specifically requires removing them, use a push stick or push block any time your hand would come within several inches of the blade, and never reach over a spinning blade to clear an offcut. Stand slightly to one side of the blade’s line of cut rather than directly behind it, in case of kickback. Hearing protection and eye protection are non-negotiable at the power level these saws run.

Frequently Asked Questions

What is a Unisaw used for?

The same jobs any table saw handles — ripping and crosscutting lumber and sheet goods, bevel and miter cuts, dado work with the right accessories — but with the accuracy and rigidity of a full cabinet saw, which is why it’s most associated with furniture-grade and production work rather than casual DIY.

When was the Unisaw first made?

Delta introduced it in the late 1930s. Most historical accounts cite 1939 as the commercial launch, though the badge on current production units reads “Unisaw Since 1937” — the two dates show up inconsistently across Delta’s own materials and independent retrospectives, so treat “late 1930s” as the safely accurate answer.

What does the model number on a Unisaw mean, like 36-L336 or 36-845?

Generally, an “L” indicates left-tilt, the number right after it is the motor horsepower, and the trailing digits reference the fence rail length in inches — a 36-L336 is a left-tilt, 3HP Unisaw with a 36-inch fence rail, and the 36-845 was a 5HP left-tilt version with a 50-inch fence. Delta hasn’t been perfectly consistent with this convention across every era, so for an exact production year on a specific used saw, a serial-number lookup is more reliable than decoding the model number alone.

How is a Unisaw different from a regular contractor table saw?

The trunnions (blade tilt/height mechanism) bolt to the Unisaw’s closed cabinet base rather than hanging from the underside of the tabletop. That keeps the table’s condition from affecting blade alignment, which is the main reason cabinet saws like the Unisaw hold their calibration better over years of heavy use than a contractor saw does.

Bottom Line

A Unisaw is Delta’s cabinet-mounted, tilting-arbor table saw — the design that’s been the benchmark for accuracy and rigidity in this saw category since the late 1930s, still in production today as the 36-L336. If you need shop-grade precision that holds up over years of daily cutting, it’s worth the price premium over a contractor saw; if you need portability or you’re an occasional user, that premium buys you accuracy you likely won’t use to its full potential.