Pen turning - from slimline to kitless

A pen turning project takes a 3/4 inch square blank, drills it for a brass tube, glues the tube in, and turns the outside down to bushing diameter before assembling the kit hardware into a finished writing instrument. The whole process runs about ninety minutes, costs under $10 in materials, and uses the same between-centers spindle skills you need for tool handles and table legs.

This guide covers the parts most pen tutorials skip: specific RPM ranges for drilling and turning, mandrel versus mandrel-less tradeoffs, wood species that actually behave on a 3/4 inch blank, and a finishing sequence that produces the glass-smooth CA surface that pens are known for. The information is consolidated so you do not have to chase it across kit manufacturer pages, YouTube tutorials, and forum threads with broken image links.

Why Pen Turning Is the Standard Starter Project

Pen turning teaches you mounting, roughing, shaping to a target diameter, sanding, finishing, and assembly, every fundamental spindle skill, on a 5/8 inch piece of wood that takes ninety seconds to rough out and another twenty minutes to finish. The brass tube acts as a built-in measuring stop: you turn down to the bushing, the bushing is sized exactly to the kit's nib and cap, and the barrel comes out the right diameter without needing a caliper.

The economics work too. A slimline kit costs $3 to $5, a 3/4 inch by 5 inch blank costs $1 to $4, and a 7mm mandrel runs $25 to $40 one-time. You can practice on twenty blanks for the cost of one bowl gouge. If you mess up a pen, you throw it in the firewood bin and move on. If you mess up a $50 elm bowl blank, you carry the regret for a week.

For lathe selection, a mini wood lathe handles every pen kit on the market, and you do not need swing capacity or motor horsepower for a 3/4 inch blank. Variable speed matters more than power for pen work.

Pen Kit Types: The Reference Table

There are roughly two dozen common pen kits in production, but most beginners start with one of six. Each kit comes with brass tubes of a specific length and bore, matching bushings, and the hardware that connects to those bushings.

Print this table and tape it inside your blank drawer. The bit sizes are not interchangeable. A 7mm bit will not seat a 27/64 inch Sierra tube, and a 27/64 inch hole leaves a slimline tube swimming in epoxy.

The slimline is the universal beginner kit because the tubes are short, the bushings are forgiving, and the brass-and-chrome plating hides minor turning marks at the centerband. The kitless pen sits at the other end of the spectrum. You turn the entire body from a solid acrylic or wood blank, cut threads with taps and dies, and assemble nothing but a nib and converter into your own threaded section. There is no kit, no bushings, and no hardware to hide imperfections.

Tools and Equipment

A pen-ready setup needs eight things. None of them are expensive, but specific items matter more than others.

As Peter Child explains in his spindle turning fundamentals piece in Fine Woodworking #12, the roughing gouge and skew chisel are the two essential tools for any between-centers work, and pen turning simply scales those same cuts down to a 3/4 inch blank. Both traditional steel and carbide work on pen blanks, and the difference is sharpening time versus replaceable inserts. I cover the tradeoffs in carbide vs HSS turning tools, but in practice a 1/2 inch skew used point-down gives the cleanest finish on dense exotics, and a small square carbide cutter is faster for soft maple and acrylic.

If you are still choosing a lathe, the best mini wood lathe roundup compares the units that handle pen work without overkill. For full-size machines see best wood lathes. Either works. Pen turning does not need a big lathe, but a big lathe does not hurt.

Mandrel vs Collet vs Mandrel-less

This is the choice that separates production pen turners from kit-only hobbyists. Three approaches, three sets of tradeoffs.

Pen mandrel (7mm shaft). A 7mm steel rod fits an MT2 morse taper in the headstock, takes a 7mm knurled nut at the tailstock end, and clamps the bushings and tube-loaded blanks in series along its length. This is the kit-included approach for slimline, comfort, EU, and most under-$15 pen kits. Cost: $25 to $40 for a quality mandrel like a Penn State, Beall, or Rick Herrell unit.

The problem with mandrels is flex. A 7mm rod with two blanks and three bushings on it bows under cutting pressure, and that bow makes the finished barrel slightly egg-shaped at the centerband. Light cuts and a short mandrel reduce it, but flex never disappears.

Mandrel-less / TBC (Turning Between Centers). Replace the mandrel with a 60-degree dead center in the headstock and a live center in the tailstock. Each centers directly into a hard plastic or steel insert that fits the tube's inside bore. You turn one barrel at a time, but the blank rotates on its own axis with zero flex. This is how high-end pen turners produce barrels that match dial-caliper measurements at every point along their length.

TBC kits cost $30 to $60 and replace the mandrel entirely. Most kit-specific bushings are available in TBC versions.

Collet chuck. A 5C or ER-series collet chuck grips the tube directly without a mandrel or center. Common for kitless pens and one-piece designs where you machine the whole pen body from a solid blank, including the threads. Cost: $150 to $400 for a collet chuck plus collet set.

For your first ten pens, use the mandrel that came with your kit. The flex is real but invisible at slimline tolerances. Switch to TBC once you start caring about caliper-measured runout, which usually happens around pen number twenty.

Choosing Pen Blanks

Pen blanks come in four families: domestic hardwoods, exotic hardwoods, acrylic/resin, and stabilized hybrids. Each cuts differently, finishes differently, and warns of trouble differently.

The Janka numbers come from the Wood Database and the FPL Wood Handbook. Anything above 2,000 lbf needs a sharper edge than you would use on a beech blank, and anything above 3,000 lbf needs a freshly stropped skew or a fresh carbide insert.

Oily exotics such as cocobolo, African blackwood, and East Indian rosewood interfere with CA finish bonding. Wipe the turned blank with denatured alcohol or acetone immediately before applying CA, and apply the first coat thin so it has a chance to grab the surface.

Acrylic and resin blanks turn beautifully but heat is the enemy. Cutting speeds the same as wood (1,800 to 3,000 RPM), but slower drilling (see below), light cuts, and sharp edges only. A dull tool melts the surface instead of cutting it, and the melted ring will not sand out. For pouring your own resin blanks, see best resin for woodturning.

Stabilized blanks, meaning soft or punky wood vacuum-impregnated with acrylic resin, turn somewhere between wood and acrylic. They handle catches better than pure acrylic and take a deeper polish than raw spalted wood.

Preparing and Drilling the Blank

A 3/4 inch by 5 inch blank produces two slimline barrels with about 1/2 inch waste between them. Mark the blank, cut it in half on a band saw or miter saw, and drill each half separately.

Drilling speed matters more than anything else in pen turning.

The withdrawal step exists to clear chips. A drill bit packed with chips generates heat by friction, and heat does two things in a pen blank: it cracks wood blanks along the grain, and it melts acrylic blanks into a glassy ring that grabs the bit and either snaps it or rips the blank off the chuck. Pull the bit completely out of the hole, knock off the chips, and re-enter the hole. This is non-negotiable on acrylic.

Drill in a drill press for accuracy, or use a drill chuck mounted in the headstock with the blank held vertically in a pen vise on the tool rest banjo. Lathe drilling is faster once you set it up and produces a hole more concentric to the eventual mandrel axis.

After drilling, sand the brass tube lightly with 220-grit to give the epoxy something to bite, glue the tube in with five-minute or thirty-minute epoxy (CA also works but cures too fast for repositioning), and let it cure for at least an hour. Square the ends of the blank flush to the tube ends with a barrel trimmer. This is the step that prevents the bushings from sitting proud of the wood and producing the most common cause of end-grain blowout.

Turning the Blank

Mount the tube-loaded blanks on the mandrel with the matching bushings, snug the tailstock just enough to remove play, and start at 500 RPM to check for runout.

Roughing cut: 1,800 RPM with a small spindle gouge or square carbide, taking the corners off until the blank runs round. Hold the tool with the cutting edge slightly above center to start, and angle the bevel against the rotation. The blank goes from square to round in about thirty seconds per barrel.

Shaping cut: 2,400 RPM, working the profile down toward bushing diameter. The bushings are sized to match the kit's nib and centerband, and the goal is to leave the wood proud of the bushing by a hair on the first pass — perhaps 1/64 inch — so you have room for sanding without sanding into the metal.

Finishing cut: 3,000 RPM, light passes with a skew used point-down or a freshly indexed carbide cutter. The surface should come off the tool ready to sand at 240-grit. If you see scratch lines or torn grain, take another light pass before you sand.

Sand from 240 through 12,000-grit micromesh, stopping the lathe periodically to sand with the grain and remove circumferential scratches. A 1/2 inch diameter pen barrel rotates at 3,000 RPM has a surface speed of 393 feet per minute — fast enough that heat builds quickly, so sand with light pressure and move the abrasive constantly.

For tool selection on small spindles, the best woodturning tools guide covers the skews and carbides that work for pen-scale work without committing you to a full bowl-turning chisel set.

Finishing With CA Glue

The CA finish is what makes a pen look like a pen — a glass-clear, deep, hard surface that no oil or wax produces. The technique is consistent enough that ten people will give you ten variations of the same five steps.

1. Sand the turned blank to 600-grit minimum, ideally to 1,200.
2. Wipe with denatured alcohol on oily species, dry rag on others.
3. Spin the lathe at 500 to 800 RPM.
4. Apply a drop of thin CA to a folded paper towel, spread it across the blank in one steady wipe from one bushing to the other.
5. Spray accelerator from twelve inches away, or wait sixty seconds for air cure.
6. Repeat with medium CA for four to eight more coats, sanding lightly between coats with 600-grit once the build-up is even.
7. Final sand through micromesh 1,500 to 12,000 grit.
8. Polish with plastic polish (Hut, One Step, or similar) on a clean rag.

CA finish has two safety issues. First, the fumes are sharp and noticeably irritating to eyes, nose, and lungs — ventilate the shop and consider a respirator with organic vapor cartridges if you do more than a pen or two per session. Second, accelerator drives the reaction fast and gives off a brief plume of harsher fumes — spray it from a distance, never directly into your face, and let the blank sit five seconds before bringing your hand near it.

Friction polish and wax are alternative finishes that look duller and wear faster. Use them for rustic pens where you want the wood to feel like wood. Use CA for the pen-store look.

Assembling the Pen

The kit's instructions show parts pressed together in a specific order. Read them. Then press the components with a pen assembly press or a quick-grip clamp with the jaws padded.

The press applies controlled, axial force. Squeezing pliers, hammering with a mallet, or pressing in a bench vise applies uneven force and cracks barrels — especially acrylic and dense exotic barrels — at the tube ends. The most common assembly failure is a hairline crack that radiates from the tube end on the first press, invisible until the customer twists the pen and the barrel splits.

Press slowly. Stop the instant you feel resistance change — that means the part has seated against its internal stop, and additional force goes straight into the wood.

Common Problems and Fixes

Safety

Pen turning is small-scale work, but the lathe is still a lathe.

• Always wear a full face shield. Safety glasses do not stop a flying bushing or a snapped mandrel.
• Spin the loaded mandrel by hand before powering on. A blank that catches the tool rest spinning at 3,000 RPM becomes a projectile.
• Start at 500 RPM with new or unfamiliar blanks. Increase only after you have confirmed the blank runs true.
• Never wear loose clothing, gloves, or jewelry near a spinning lathe. A glove caught in a 7mm mandrel will not let go.
• Keep the tool rest within 1/8 inch of the workpiece. Wide gaps catch tools and pinch fingers.
• Drill acrylic at 250 to 500 RPM with constant chip clearing. Heat-melted acrylic grabs bits and ejects blanks.
• Ventilate the shop when applying CA finish. Use a respirator with organic vapor cartridges for sessions longer than one pen.
• Stand to one side of the accelerator spray, not in front of it. The initial vapor plume is irritating.
• Use a pen press for assembly. Pliers and vises crack barrels.

For toxic species — cocobolo, padauk, all rosewoods, ebony — wear a respirator while sanding and clean the chip pile from the lathe bed before the next session. Cocobolo dust in particular sensitizes people who tolerated it the first ten times, and the third or thirtieth exposure can trigger a strong allergic reaction.

What to Turn First

A 7mm slimline kit, a $1 hard maple blank, and a generic 7mm mandrel. Make ten in a row. Take notes on what failed, what you forgot, and what you want to do differently. Stop when you can produce a clean, round, CA-finished pen from blank to assembly in under sixty minutes.

After ten slimlines, switch to a Sierra or European kit to get used to a larger diameter and different bushings. After twenty, try cocobolo or acrylic to practice on a less forgiving material. After thirty or forty pens, you are ready to make the jump to mandrel-less turning and start thinking about kitless work.

The whole arc costs about $150 in kits and blanks. By the time you finish, you will have practiced every spindle skill you need for tool handles, candlesticks, ornaments, and most furniture work. That is why pen turning is the gateway project — the skills it teaches are not pen-specific. They are turning-specific.