Most drill bit problems aren't drill bit problems. They're workholding problems wearing a drill bit costume. A bit that wanders on entry, a hole that's oversized and bell-mouthed, a broken drill in a workpiece that "shouldn't have been a problem" — trace almost any of these back to the root cause and you'll find the part wasn't held right.
Milling gets all the attention when fixturing is discussed. Drilling feels simpler — you're just making a hole. But drilling creates forces in three directions simultaneously: downward (feed force), rotational (torque), and radial (lateral deflection from any asymmetry in the cut). Every one of those forces wants to move the workpiece.
When the workpiece moves even slightly during drilling: the hole wanders off location, the drill sees an asymmetric cutting load (which heats one lip faster than the other), on breakthrough the drill can grab and twist, and in thin materials the workpiece can spin with the drill — a safety hazard.
The most common and most versatile option for drill press and mill drilling. Key setup notes: parallels matter (a rocking workpiece is an inaccurate hole), don't overtighten small parts, position the cut over the vise screw when possible, and for through-holes drill through the vise jaw slot or raise the workpiece on parallels so the drill exits into air, not the vise bed.
For parts too large for a vise, step clamps bolt directly to the table or a T-slot fixture plate. Rules that matter: the support stud behind the clamp heel should be the same height or slightly higher than the workpiece, clamp as close to the cutting zone as practical, and for aluminum or soft metals use brass or aluminum pads between the clamp and workpiece to prevent marring.
Specifically designed for round stock — shafts, pins, pipe, tube. Without them, round stock under a drill will roll the instant the bit touches it. Pair V-blocks with a hold-down strap or a clamp across the top. The V registers the part; the strap prevents it from lifting when the drill exits. For cross-drilling a shaft, this combination is essential.
For drilling at 90° to the part's primary face — drilling the side of a block, for instance — an angle plate clamped to the table gives you a reliable perpendicular reference. Less common in general shops but indispensable for production work where perpendicularity matters.
For small parts, a small drill vise held by hand is common. It's fine for non-critical hole locations in light materials. It is not fine for anything larger than 3/8" in steel, any hole requiring a precise location, or any material that produces a significant breakthrough grab. For all of those, bolt the vise down.
The most common failure mode from poor fixturing is drill deflection at breakthrough. The drill cuts well for most of the hole depth. As it approaches breakthrough, the remaining web of material gets thin and cutting forces spike. The part shifts or tilts by even a fraction of a degree. The drill now sees an asymmetric load. For small drills (under 1/4"), this often means the bit snaps. For larger drills, it means a grabbed hole.
A third mode: torque-spinning. In a non-bolted setup where the part is just sitting on the table, a drill larger than about 1/2" in steel can generate enough torque to spin the workpiece when it catches. This is a hand injury waiting to happen.
Any time you're drilling through material and the drill exits into open air, you get tearout on the back face. The fix: clamp a sacrificial backup piece (scrap MDF, aluminum, plastic, or same-material scrap) behind the workpiece. The drill exits into the backup material instead of into air, which supports the material at the cutting edge exit point and eliminates tearout. This also eliminates the breakthrough grab.
Center punch first. A sharp center punch driven with a medium mallet creates a conical divot that the drill point seats into. Without it, the chisel edge wanders until it catches something.
Center drill second. A center drill (60° included angle, stubby shank, very rigid) creates a short pilot hole that exactly guides the full-size drill. It runs at higher RPM than the full drill, cuts quickly, and produces a spot that the drill's point drops into with no wander. For any hole that needs to land within ±0.010" of layout, center drilling is not optional.
Sequence for accurate hole location: lay out and center punch → center drill at high RPM → pilot drill (if over ~3/8" final diameter) → final drill to size.
A rigidly held workpiece lets a sharp drill cut efficiently and stay sharp longer. A loose workpiece creates micro-interruptions in the cut — the part shifts, the drill deflects, the lip geometry gets a beating. If you're resharpening or replacing drills faster than seems right, check your fixturing before you assume the bits are at fault.
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