Dovetail Jigs by the Numbers: What a $139 Jig Actually Does

The shop stays cold enough on winter mornings that I keep a wool vest on until the stove catches. Cold mornings are good for quiet work, and quiet work is what a dovetail asks for. But I've been asked a blunt question that quiet work tends to dodge: if you had to make the same drawer box three ways — all by hand, with a jig, and with hand-cut pins and routed tails — what would it actually cost you in minutes and dollars? I went looking for honest numbers. What I found was a lot of air where the numbers should be, and a few solid facts worth more than the plenty that wasn't.

What the record will not tell you

Let me be plain about the shape of this investigation, because it is the most useful thing I can report. I could not find a single verified figure for minutes per drawer, for any of the three methods. Not from a magazine test, not from a maker's blog I could trust. I could not find a measured gap tolerance in thousandths for a hand-cut joint — the only quantified fit figure anywhere in the record was the Leigh elliptical bushing's "few thousandths of an inch" of adjustment, reported by WOOD Magazine. And I could not compute a break-even batch size, because break-even needs both a time-per-unit and a setup overhead, and neither survives scrutiny in what's documented.

The hybrid method — hand-cut pins, routed tails — was not documented in any source I could open at all. And the searches themselves were polluted enough that I'd rather name the failure than paper over it: decoys, dead links, and worse. I will not dress that up as data. What I have is real prices, real capacities, real setup burdens, and my own hands. So this is an article about what a $139 jig actually does, and about the accounting you can honestly do before you buy one.

The joint, briefly, so we're talking about the same thing

A dovetail is pins interlocking with tails, trapezoidal, glued and needing no fasteners — a joint "commonly used to join the sides of a drawer to the front," as Wikipedia puts it. The relevant distinction for drawers is through versus half-blind. A through dovetail shows end grain on both boards; a half-blind hides the tail ends and is the one commonly used to fasten a drawer front to its sides. That naming matters, because a jig that only cuts throughs cannot make the joint you see on the front of a fine drawer. Wikipedia also gives the slope conventions — 1:6 for softwoods, 1:8 for hardwoods, 1:7 a common compromise — and notes, citing a 1958 study, that a different slope does not affect joint strength across wood types. So don't lose sleep over the ratio. Lose sleep over fit and setup, which is where the money and time actually go.

What $139 buys, specifically

The Leigh TD330 is listed at $139.00 on Leigh's own product page and is the closest verified match to a "$150-ish" jig. It makes fixed 1/2" joints in boards up to 12-7/8" wide, and ships with a carbide-tipped 1/2" straight bit, a 1/2" 8° dovetail bit, and an e10 guide bushing. It needs a router table that accepts an industry-standard 1-3/8" guide bushing. That list of contents is not small: WOOD Magazine's seven-jig test found that the three sub-$200 jigs each required at least one additional bit to cut all three joint types — and the CMT 300 at $130 includes no bits at all and needs $185 of accessories. So a $139 jig that arrives with bits and bushing is closer to honest than the sticker suggests.

But read Fine Woodworking's 2020 review before you romanticise it. Asa Christiana found the TD330 cuts through dovetails only, with fixed spacing — you "stick to a range of specific board widths to get neat half-pins on the ends" — and, crucially, that it requires DIY before first use: you build a straight beam from MDF, mount the hardware accurately, and remake that beam occasionally for different setups. That beam is what stops blowout. This is a recurring cost, in minutes and material, that belongs in your accounting from the first drawer.

Dates matter here. FWW listed the TD330 at $100 in 2020; Leigh lists $139 now. WOOD's December 2024 round-up put the D4R Pro at $600; Leigh's current page says $1,069.00. Same jig, different date, different number. When you're comparing, date-stamp every price you see.

Setup is the tax nobody quotes

WOOD Magazine describes what every jig demands before a repeatable cut: guide bushing mounted, workpiece stops set, built-in clamps engaged, a user-supplied backer board fitted. On fixed-finger jigs, the template dictates your workpiece width — WOOD reports finger spacing from 13/16" to 1" for half-blinds and 13/16" to 1-3/8" for through dovetails — because you must leave half-pins at each end. That means a drawer side sized to a nice round number may not fit your jig without reshaping. The D4R Pro escapes this: it does infinitely variable spacing, handles 1/8" to 1-1/2" thickness and 1" to 24" width, and requires a router with a 1/2" collet. That freedom is what you're paying the extra several hundred for.

The one piece of fitting you can trust to numbers: Leigh's elliptical guide bushing lets you fine-tune fit by rotating it a few thousandths of an inch, per WOOD — but you must hold the router in exactly the same orientation with every cut. A few thousandths is both a comfort and a trap: comfortable because you can dial in fit, a trap because a twist of the router across a day's batch may cost you the fit you dialled in. Practice before production.

Two more verified working points. WOOD found 1/4"-shank bits tended to vibrate and chatter more than 1/2" or 8 mm shanks — my own ear agrees, and I've written about shank chatter elsewhere on the site, so I won't relitigate it here. And for end grain, WOOD advises a bit with shear (angled) or downcut spiral edges. Those are real-time savers, not abstract advice.

My honest accounting, with no minutes invented

I cannot give you a table of minutes per drawer, because I have no measured figure I trust, and I will not manufacture one to fill a column. Here's what I can tell you from the bench. Hand-cut dovetails are slow at first because the saw wanders and you spend time on the fit — chisel, pare, close up, open, pare again — and the snick of a chisel paring a pin cheek is the whole art in miniature. They get faster with repetition, but the setup overhead is near zero and the tool cost is your grandfather's kit plus sharpening stones. The jig is the reverse: heavy setup, plus the MDF beam, plus dialling the bushing, and then a rhythm that runs as smoothly as you like. The hybrid — pins by hand, tails routed — is where I expect a lot of us would land, but no documentation I could open described it, so I won't pretend it's corroborated.

Here's the shape of a defensible comparison, without a break-even number attached:

	Hand-cut	Fixed-spacing jig (TD330)	D4R Pro class
Verified price	n/a	$139 (Leigh)	$1,069 (Leigh); $600 (WOOD, 2024)
Edge vocabulary	any	through only	through + half-blind + more
Width constraint	none	template width	none
Recurring consumable	none	MDF beam, remade	backer board (user)
Fit adjust	by hand	elliptical bushing, few thousandths	elliptical bushing, few thousandths

Read down the left column: hand-cut pays in time, and takes the slope you choose. Read the middle: the $139 jig pays in setup and width limits for repeatable speed. Read the right: pay much more for freedom of spacing and joints. Where your break-even sits depends on your hourly value and your batch — and because I won't invent a number for either, the only honest instruction is this: time your own first twenty drawers, per method, with a stopwatch. That's the only figure that will ever be true for your shop.

The judgement

If you're a weekend woodworker making two or three drawers a season, buy the $139 jig, learn its beam and its bushing, and get on with your life — the fit adjustment on that elliptical bushing is a skill worth the money on its own. If you make drawer boxes by the dozen and see a variation in spacing, the D4R Pro class is not a luxury but a variable-spacing machine, and that freedom is what you're buying. And if you make fine drawers for the love of the joint, hand-cut is the method whose lineage you can hold in your hand, chisel handles worn smooth by use. The joint that earns its minutes is the one whose evidence of a hand at work still pleases you at the end of the year.

Whatever you choose, time it yourself. Then you'll know what a $139 jig actually does — in your shop, with your hands.