Coil Machine FAQ
Coil Machine FAQ
Click the arrow next to each question to reveal the answer.
Buying Decisions
Coil vs rotary, which should I learn on, and which is better for lining vs shading?
For anyone starting out, we point straight to the W 1.250 Liner and W 1.250 Shader. These two are built specifically to give a new artist a stable, reliable foundation on coil, rather than getting lost in the broader coil-versus-rotary debate before they've even found their footing.
What's the difference between a $150 coil machine and a $500-plus one?
You're not paying for the machine, you're paying for experience. A higher-end coil machine is built in a high-end machine shop with attention to every detail. Precision, tolerances, and craftsmanship that a mass-produced budget machine simply can't match.
Why do some coil machines cost so much more than others (hand-built vs mass-produced)?
A hand-built machine carries vision, drive, design, and genuine understanding of tattooing itself. Built by someone who tattoos, not just assembles parts. A factory machine is often put together by someone with no real understanding of tattooing at all; it's just nuts and bolts. That difference in intent shows up in how the machine performs and lasts.
Are American-made coil machines actually better, or is that just marketing?
It comes down to who's building it and how it's made. High-end machining, careful assembly, and a builder who understands tattooing produces a fundamentally different tool than a mass-produced import. It's less about a flag and more about the standard of craftsmanship behind it.
Parts & Terminology
What does the armature bar do on a coil machine?
The armature bar is the heavy metal bar that gets pulled by the coils' electromagnetic field. That pull is what actually drives the needle down. It's mounted on the front and rear springs, so its weight and balance directly shape how the machine feels. Speed, hit, everything comes back to this piece.
What is a contact screw and how does it affect performance?
The contact screw completes the electrical circuit. When the front spring touches it, current flows and the coils fire. Adjusting the screw changes the gap the armature bar has to travel, which changes speed and how hard the machine hits. Small turns make a real difference here. This is one of the most sensitive adjustments on the whole machine.
What's the difference between the front spring and rear spring?
The front spring works with the contact screw to complete the circuit and acts as a shock absorber for the armature bar. The rear spring pulls the armature bar back up after each cycle and controls how the needle retracts. Different thickness and length on either spring changes the feel. Stiffer springs hit harder, softer springs run smoother.
What does the coil actually do inside a tattoo machine?
Coils are wire wrapped electromagnets. When power runs through them, they generate a magnetic field that pulls the armature bar down. That pull and release cycle, over and over, is what drives the needle and makes that familiar buzz. Two coils working together is the standard setup on most machines today.
What's a binding post, and why does it matter?
Binding posts are the connection points that hold key parts in place and carry electrical current through the machine. The front binding post connects to the negative lead and holds the contact screw. If a binding post is loose or corroded, current doesn't flow clean, and the machine runs inconsistent even if every other part is dialed in right.
Frame material, brass vs iron vs steel, does it change how the machine runs?
Yes, frame material affects vibration and overall feel. Iron and brass frames tend to dampen vibration better than lighter materials, which can make the machine feel steadier in hand. It's not just aesthetics. The frame is the foundation everything else bolts to, so its weight and rigidity carry through to every part of the tattoo.
Setup & Tuning
How do I tune a coil machine properly (gap, spring tension, contact screw)?
It depends on the style of machine you're setting up. As a rule of thumb, a liner runs at a shorter stroke while a shader runs at a much larger stroke, though plenty of artists run liners as shaders and vice versa. There are many methodologies here, and we'll be going deeper into tuning specifics in upcoming blog posts and how-to videos.
Why does my machine sound "off" or run hot?
There are a lot of possible causes: hysteresis, poor power input from a mismatched power supply, an improper setup, friction in the needle and tube setup, a bad clip cord, worn or breaking-down springs, or simply a lack of preventative maintenance. It's usually one of these variables, sometimes a combination.
What's the right voltage to run a coil machine at?
Voltage is entirely based on your own setup and comfort. The best approach is to run test setups and dial in the voltage that feels right once the machine is tuned and ready to tattoo. There's no single universal number.
Why does my liner keep going out of tune mid-session?
This usually comes down to setup issues, often coil alignment, or a spring that's losing its tension over time.
Maintenance & Longevity
How often do springs and contact points need replacing, and how do I maintain a coil machine long-term?
Keeping the springs and machine clean is the single biggest factor in longevity. It extends spring life and keeps your tune holding longer. Small, consistent preventative maintenance goes a long way. We'll be covering specific PM tips and tricks in blog and video form on the site.
Are coil machines easy to repair, or is that a hassle compared to rotary?
Coil machines can be repaired indefinitely, and they're actually one of the easiest tools in the industry to work on yourself. Springs, contact screws, coils, and armature bars can all be serviced or swapped individually rather than replacing the whole machine. They're rebuildable in the field or can be sent back in for a full rebuild.
Beyond just being repairable, learning to tune and repair your own coil machine is genuinely one of the best ways for a tattooer to understand the craft on a deeper level. There's something rewarding about getting a machine to run just right, and doing your own repairs gives you real freedom and control over your equipment instead of depending on someone else. Compare that to many overseas-manufactured rotaries, which can become effectively disposable once something goes wrong and service isn't readily available.
How do I properly clean my tattoo machine with Madicide?
Never spray Madicide directly onto your machine. Spray it onto a clean wipe or cloth first, then wipe down the frame, grip, and any exposed hardware. Avoid saturating the coils, contact screw, or any electrical connection points, since trapped moisture there causes more problems than it solves. Let the solution sit on the surface for the full contact time listed on the bottle, typically several minutes, before wiping it away.
How do I clean the Madicide off so it doesn't rust my machine?
Once the disinfectant has had its full contact time, wipe the machine down again with a clean cloth, lightly dampened with water, to remove any leftover residue. Dry the machine completely afterward, paying close attention to seams, springs, and contact points where moisture likes to sit. Leaving disinfectant residue on bare metal, especially iron or steel parts, is what leads to rust over time. A light coat of machine oil on exposed metal after drying adds an extra layer of protection.
Is there anything I should use to protect the frame long term, beyond regular cleaning?
Yes, Renaissance Wax, a museum grade microcrystalline wax, applied to the frame every six months. It's the same wax conservators use to protect metal artifacts and antique tools from tarnish and corrosion. A thin coat, buffed out after it dries, adds a protective barrier without attracting dust or leaving a greasy residue the way regular oil can.
Build & Craftsmanship
What makes a hand-built coil machine different from a factory one?
Vision, drive, design, love, and a genuine understanding of what makes a good tattoo machine. A hand-built machine is made by someone who understands tattooing. A factory machine is often assembled by someone who doesn't. It's just nuts and bolts put together without that deeper understanding.
Why do old-school builders (Paul Rogers-lineage) still command such respect and price?
Magic, love, lineage, respect, heritage, tradition. Some things in this craft simply can't be replicated by a factory. They're earned over generations.
Do CNC-machined parts actually perform better than cast or stamped parts, or is it just aesthetics?
It's genuinely situational and depends on the application. It's hard to make a blanket claim that one always outperforms the other.
Who actually invented the tattoo machine?
Samuel O'Reilly filed the first U.S. patent for an electric tattoo machine on December 8, 1891. He built it off Thomas Edison's autographic printing pen, a device Edison designed years earlier for stencil duplication, not tattooing. O'Reilly added an ink reservoir and reworked the barrel so the motor sat back over the hand.
Tom Riley of London is often credited with a coil machine patented weeks after O'Reilly in late 1891, but there's no patent record to back that up. That claim comes from a recollection written decades later by George Burchett, a well known London tattooist, not from any patent office filing.
The real, documented inventor of the single coil tattoo machine is Sutherland Macdonald, Britain's first professional tattoo artist, working out of Jermyn Street in London. In 1894 he received British patent number 3035 for an electromagnetic coil and needle machine built to automate needle movement instead of relying on hand tools alone. The design had too many moving parts to be fully practical, and Macdonald kept working with Japanese hand tools for shading and heavy work even after the patent. Still, his 1894 patent is the first documented single coil tattoo machine on record, years before twin coil designs like Alfred Charles South's 1899 patent came along.
Buyer Hesitation
Is coil "dying", should I even bother learning it in 2026?
Not even close. Coil is a hundred-year-old technology that works perfectly. It's actually one of the best ways to put a needle into the skin because it's self-regulating and has a natural stopping point built into how it runs.
Will I regret buying coil if the industry's moving toward rotary?
Coil isn't going anywhere. It's proven, self-regulating technology that's lasted a century for good reason. It remains one of the most maintainable and repairable tools in the industry.
What's the resale value on a quality coil machine?
It depends heavily on the seller. Brand reputation matters most, but condition, how hastily the artist is selling, and other variables all play into it. There's no fixed answer.
Contact
B@feldmantoolco.com
