Stationary Machinery Setup and Operation
This domain tests setup, alignment and safe feeding of the main shop machines - table saw, jointer, planer, band saw, shaper, drill press, sanders and CNC. Questions typically describe a defect in the cut and ask for the setup cause and the correction.
Table saw
- The blade must be parallel to the miter slot, typically within about 0.1 mm measured at the front and rear of the blade plate.
- The riving knife sits in line with the blade, its top just below the tooth tips, and its thickness matched to the blade plate; the splitter and anti-kickback pawls follow it.
- The fence must be parallel to the blade or slightly open at the rear. Stand out of the kickback line and use push sticks and featherboards near the blade.
Jointer and planer
- Jointer tables must be coplanar and the knives set exactly level with the outfeed table - a straightedge dragged over the cutterhead should move a few millimetres.
- Depth of cut on a jointer is light, commonly around 1 mm per pass for a clean edge; face joint before edge jointing.
- Planer snipe comes from roller pressure and bed geometry - feed with support, and check bed rollers and chip breaker settings.
Band saw, shaper and drill press
- Band saw: correct tension, guides set about 0.5 mm from the blade, thrust bearing just behind the blade, blade tracking on the crown of the tyre.
- Shaper: cutter rated for the spindle speed, guard or ring in place, power feeder set for a consistent feed, and never feed with the rotation.
- Drill press: speed falls as bit diameter rises; remove the chuck key before starting.
CNC and sanders
- Verify work offsets and tool lengths with a dry run; confirm the program matches the setup sheet.
- Check belt tracking and oscillation on edge sanders; a worn belt glazes the surface and burns edges.
Worked example
A jointer produces a concave edge along a 1.2 m board. Concave means material was removed from the middle, so the ends rode up - the outfeed table is too low relative to the knives. The fix: raise the outfeed table until a straightedge laid on it just touches the knife at top dead centre, then re-test on scrap. If the edge came out convex, or the cut was heavier at the start, the infeed side or feed technique would be the suspect instead.
Traps that cost marks
- Adjusting a machine while it is running, or without lockout where required.
- Removing the riving knife because it interferes with a non-through cut - use a proper low-height setup instead.
- Setting jointer knives by eye rather than with a straightedge on the outfeed table.
- Feeding the shaper in the direction of cutter rotation.