Pen Turning on a Wood Lathe: Blanks, Bushings, Kits, and CA Finish

General wood lathe skills — spindle turning, faceplate work, tool technique — carry over to pen turning, but pens have their own ecosystem of mandrels, bushings, and kits that make them one of the most approachable first projects on a lathe, and one of the most sellable small-batch items a shop can produce. A finished pen takes under an hour of lathe time once you know the workflow, and the specialized tooling is inexpensive compared to most other lathe accessories. This guide covers the kit-specific gear, the drilling and gluing steps that happen before the lathe ever spins, and the CA finish that gives pen blanks their glass-like shine.

Understanding a pen kit

A pen kit is a small hardware set that turns a shaped wooden or acrylic blank into a functioning pen: brass tubes that get glued inside the drilled blank, a writing mechanism (twist, click/clicker, rollerball, or fountain nib unit), and the clip/finial hardware that presses onto the finished, turned barrel. Kits are sold by tube diameter and mechanism type, and every other piece of pen-specific tooling — drill bit, bushings, mandrel — has to match the kit you bought, so pick the kit first.

Preparing the blank

1. Cut blanks to length slightly longer than the kit's tube, typically with an extra 1/8" per end for squaring later.
2. Drill the blank on a drill press using the brad-point bit size specified for that kit (common sizes run from about 5/16" to 27/64" depending on tube diameter) — a drill press, not a hand drill, is what keeps the hole centered and straight through the full length of the blank.
3. Rough the tube surface with sandpaper or a tube-prep tool so epoxy has something to grip — a smooth brass tube glued with nothing but surface tension will spin loose on the lathe.
4. Glue the tube in with a slow-cure epoxy (medium-set CA works too, but epoxy gives more working time to seat the tube fully before it sets), standing the blank vertically so epoxy doesn't pool to one end.
5. Square the ends on a barrel trimmer (a pen-specific tool that trims the blank flush with the tube end and perfectly perpendicular to the bore) — skipping this step is the most common reason finished pen components don't sit flush against each other later.

Mounting on the mandrel

A pen mandrel is a dedicated between-centers accessory that threads onto the lathe and holds one or more glued blanks stacked between bushings — small sleeves matched precisely to the kit's component diameters, which set the exact finished diameter at each transition point on the barrel. Turn down to just barely touching the bushings on each side; if you turn past the bushing diameter you've removed material you can't put back, and the hardware won't seat flush.

Pen kit familyTypical drill bitTube diameterMechanism type Slimline7mm (~9/32")7mmTwist Cigar10mm10mmTwist or click Jr. Gentleman / Gentleman3/8"–27/64"Varies by sub-kitClick, twist, or fountain Sierra10mm10mmClick (bullet-style)

Always check the specific instructions that came with your kit — bit sizes and bushing sets vary even within a kit family across manufacturers, and this table is a starting reference, not a substitute for the kit's own spec sheet.

Turning and sanding

Rough the blank round with a spindle roughing gouge or skew, working from the center outward on each side to avoid tearing the end grain near the joint between blank sections. Shape toward the final profile with a detail gouge or skew, checking regularly against the bushing diameters. Sand progressively from around 150–180 grit up through 400+ grit between the lathe stopped and spinning passes as needed — acrylic and resin blanks in particular show every scratch left by a skipped grit once the CA finish goes on.

Applying a CA finish

The glass-smooth finish typical of turned pens comes from thin cyanoacrylate (CA) glue applied directly to the spinning blank, not from a sprayed lacquer:

1. With the lathe spinning at a moderate speed, apply a few drops of thin CA to a folded paper towel.
2. Wipe it onto the spinning blank in light, even passes, letting friction cure each thin coat almost instantly.
3. Build up multiple thin coats (most turners do 3–6 passes) rather than one thick one, which tends to craze or cloud.
4. Once built up, polish with progressively finer micro-mesh abrasive pads (typically 600 through 12000 grit) to bring up a high gloss.
5. A plastic/acrylic polish or finishing wax applied at the end deepens the shine further.

Assembly

A pen press (or a drill press repurposed with the chuck removed) applies even, controlled force to seat the mechanism, clip, and finial components into the finished barrel without cracking it — hand-pressing uneven force into brittle acrylic blanks is a common way to split a barrel after an hour of turning and finishing work.

Safety notes

• CA glue cures on contact with moisture, including skin — have acetone or a CA debonder on hand, and be deliberate about where your fingers are relative to a spinning, glue-covered blank.
• Thin CA fumes are irritating in enclosed spaces; work near ventilation, and note that CA accelerator spray (if you use one to speed cure) adds its own fumes on top.
• Small-diameter spinning stock at a pen mandrel's typical speed is less dangerous than larger lathe work, but loose sleeves, gloves, and jewelry near a spinning mandrel are still a bad combination — the same rule that applies to all lathe work applies here too.

Once the kit-specific tooling is in hand, a pen is one of the fastest ways to put a lathe to productive use: the whole workflow from drilled blank to polished, assembled pen fits comfortably in an evening, and the only thing that really changes project to project is the blank material and the kit you reach for.