Workshop tool clearances: saws, benches and infeed

The footprint of a table saw is about 6 sq ft (0.56 m2). The space it needs is closer to 74 sq ft (6.9 m2), and none of that space is optional, adjustable or shared with the machine next to it unless you plan it to be. Workshop planning in a garage is not the arrangement of tools. It is the arrangement of the corridors they feed from, and there is usually room for one.

The 18 ft 6 in a full sheet demands#

Start with the workpiece, because in a garage workshop the workpiece is almost always a sheet: 48 x 96 in (1220 x 2440 mm) in North America and the UK, 1200 x 2400 mm (47.2 x 94.5 in) across most of continental Europe. That 1.5 in (38 mm) difference is small until you cut a cabinet run designed in one system from board bought in the other, which is one of the collisions catalogued in imperial and metric dimension systems.

Now follow the sheet through a rip cut.

1. At the start, the leading edge is at the blade and the sheet extends 96 in (244 cm) back from it. That is the infeed.
2. At the finish, the trailing edge is at the blade and the sheet extends 96 in forward. That is the outfeed.
3. Behind the sheet at the start stands the operator, needing about 30 in (76 cm) to plant their feet and push.

Add them: 96 + 96 + 30 = 222 in, which is 18 ft 6 in (5.64 m). The saw's own table is inside that figure, not added to it, because the blade is the origin and the table straddles it. Nothing else may be in the line, including a bin, a bike, a compressor hose or the front of a parked car.

A 22 ft (6.7 m) bay is 264 in, so it clears the requirement by 42 in (107 cm). A 20 ft (6.1 m) bay is 240 in and clears it by 18 in (46 cm), which is nothing. Across a 12 ft (3.66 m) width, at 144 in, the operation is impossible. Bay sizes and where those depths come from are in garage sizes: single, double and triple.

Width is a smaller number and it catches fewer people. Across the blade line you need 48 in (122 cm) to the left for the offcut side of a halved sheet, the rip fence capacity to the right, typically 30 in (76 cm) on a contractor saw and 52 in (132 cm) on a cabinet saw with long rails, plus about 12 in (30 cm) of saw body: 90 in (229 cm) for the small fence and 112 in (284 cm) for the long one. In a 12 ft bay the long-rail saw leaves 32 in (81 cm) of aisle in total, so long fence rails and a single bay are close to incompatible.

Measuring from the blade, not from the table edge#

Every figure above is taken from the blade, and this is where plans go wrong. The blade slot on a cast iron top sits roughly 12 to 13 in (30 to 33 cm) back from the front edge of the table, so a saw pushed until its table touches the wall still has its blade a foot out into the room, and the outfeed measured from the table's back edge overstates the clearance by 15 in (38 cm).

The same applies to a mitre saw. Its fence, not its base, is the reference: on a 12 in slider the fence sits 8 to 10 in (20 to 25 cm) back from the front of the base, and the support wings either side must align with the table, which is 3.5 to 4 in (89 to 102 mm) above the base feet. Mark the blade line and the fence line on the floor and the bench with a pencil before anything is bolted down. Those two lines are the datum for the whole shop.

Footprints and the zone each machine actually claims#

The pattern in the last column is the point: five of the nine machines claim a corridor 8 ft (2.44 m) long in each direction, and they all claim it at approximately the same height. That is not a coincidence and it is not a problem. It is the opportunity.

Rear rails, wing length and the 4 in step at the mitre saw#

The mitre saw station is the second corridor, and it can be made to lie on top of the first. To cut a 16 ft (4.88 m) length of trim you need 8 ft (2.44 m) of support each side of the blade, so 16 ft plus the 30 in (76 cm) saw is 18 ft 6 in (5.64 m) of wall, the same number as the rip corridor, which is why the two so often end up as one run along the back of a double garage.

Bench depth is set by the saw's rail design and by nothing else:

The 4 in (102 mm) step is the detail that decides how the station is built. A 12 in slider's table sits 3.5 to 4 in above its feet, so a saw simply bolted to a 34 in (86 cm) bench cuts at 38 in (97 cm) and its wings must be built at 38 in too, which is above comfortable work height for most people. The alternatives are to recess the saw into a 4 in well so its table lands flush at 34 in, or to build the whole station at 30 in (76 cm) so the cut height comes out at 34 in. The heights that work for different tasks, and the elbow-height reasoning behind them, are in work surface heights by task and applied to the bench itself in workbench height, depth and clearances. If the wings span more than about 32 in (81 cm) between legs, check the boards through the shelf span and sag calculator: a wing that droops 1/4 in (6 mm) puts a bow in every long cut.

Duct sizes, air volumes and where the cyclone stands#

Wood dust needs a transport velocity around 4,000 fpm (20 m/s) in a branch duct to stay airborne. Multiply that by the duct area and the volume follows directly.

Two 4 in branches do not combine into a 6 in trunk on area alone: two branches at 0.087 sq ft are 0.174 sq ft against the 6 in duct's 0.196, so a 6 in trunk serves two open 4 in gates and no more. In practice only one gate is open at a time, which is why blast gates exist and why the trunk is sized for the biggest single machine rather than for the sum.

The collector itself is a piece of furniture. A cyclone stands 78 to 96 in (198 to 244 cm) tall, needs 30 x 24 in (76 x 61 cm) of floor and 24 in (61 cm) of clear space in front to drop and empty the drum. On an 8 ft (2.44 m) garage ceiling it barely fits, and it certainly does not fit under the open garage door track, so it belongs against a side wall behind the door travel line worked out in garage door sizes, headroom and backroom. Service clearances for the other machinery a garage tends to accumulate, from air handlers to heat pumps, follow the same logic and are set out in HVAC and air handler clearances.

Aisles, sockets and two people in one bay#

Between machines, allow 36 in (91 cm). That is not a comfort figure, it is the width a person occupies while carrying a board across the body, and it comes from the same shoulder-breadth arithmetic as the domestic routes in walkway and circulation widths. Thirty inches (76 cm) is the absolute minimum for edging past a stationary machine, and 48 in (122 cm) is what two people genuinely need, a figure derived in clearance for two people to pass and work.

Measure the aisle to the widest projection, not to the machine body. On a table saw that is the end of the fence rail; on a bandsaw it is the upper wheel housing; on a lathe it is the tailstock handwheel at full extension.

Sockets want to be above the bench, not behind it, which in a workshop means about 42 to 48 in (107 to 122 cm) above the floor rather than the 12 to 18 in (30 to 46 cm) used elsewhere in a house. The reasoning and the regional variations are in socket and outlet heights, and the code positions that constrain them are collected in the standards and codes reference. Wall storage above the bench competes with the same band, and its depth budget is worked through in garage shelving and overhead storage. The remaining garage figures sit together in the garage and workshop section.