Coil Machines, Steel, and the Lineage of Understanding
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Coil Machines, Steel, and the Lineage of Understanding
Notes From a Life Spent Around Tattoo Machines
By Brandyn Feldman
There comes a point when you spend enough time around coil machines where you realize that what you are seeing on the outside is only part of the story.
You can measure voltage. You can count wraps. You can adjust springs and listen to the sound. But the real work is happening inside the steel, in a place you cannot see.
When I was younger and completely obsessed with coil machines, I spent countless hours chasing small changes. Rewinding coils. Swapping cores. Filing springs. Listening closely. Trying to understand why one machine felt alive and another felt heavy.
If I had come across a deep explanation of what was actually happening inside the steel back then, I probably would have lost my damn mind.
Now I am older and still completely obsessed with coil machines. Maybe even more than before. The deeper you go, the more you realize how much there is to learn.
Coils Are Simple, But Not Simple
At their most basic level, coils are copper wire wrapped around a soft iron core. When current flows, a magnetic field forms. That field pulls the armature bar. The circuit breaks. The field collapses. The springs return the armature.
This happens thousands of times every minute while you tattoo.
It sounds simple, and mechanically it is, but the behavior of the machine is shaped by subtle interactions between electricity, magnetism, steel, geometry, and timing.
Understanding that interaction changes how you look at everything.
Inside The Steel
Inside every core, yoke, and armature bar are magnetic domains. Tiny regions where atomic moments align in different directions.
When the machine is at rest, these domains sit in a natural state. They are disordered. Balanced. Neutral.
That chaos matters.
It means the steel is relaxed and ready to respond.
When the coils energize, the magnetic field forces the domains to align. The alignment strengthens the field and pulls the armature bar downward.
When the circuit breaks, the domains relax and drift back toward disorder.
This alignment and release is happening constantly while you work.
You cannot see it, but you can feel it.
The Importance Of Returning To Neutral
A machine runs best when the steel can return to a natural state between cycles.
If the domains remain partially aligned, residual magnetism holds onto the armature bar. The release becomes slower. The machine can feel sticky or heavy.
Builders have described this feeling for decades without necessarily naming the physics behind it.
The goal is clean alignment when energized and clean release when power drops.
That is where good steel matters.
Metallurgy Is Not An Afterthought
Steel is not just shape. It is structure.
Grain size, composition, stress, and processing all affect how domains move. Soft magnetic steels allow domains to shift easily. Materials with internal stress or impurities resist change.
You may not think about metallurgy while tuning, but you feel it when a machine runs effortlessly or fights you.
Understanding this deepens respect for material selection and machining practices.
Saturation And Efficiency
As current increases, more domains align. Pull increases. But eventually the material approaches saturation, where most domains are already aligned.
Beyond that point, additional energy becomes heat rather than useful magnetic work.
Old builders recognized this even if they did not use the term saturation. They knew when a machine was being pushed too hard.
Efficiency has always been part of good machine building.
Listening Matters
Numbers help, but the machine speaks through sound and feel.
You learn to hear when the machine is relaxed. You learn to feel when the pull is clean. You notice when timing is balanced.
This kind of listening is a skill developed through time.
The best builders have always paid attention.
Why History Matters
After a while you begin to see that progress in tattooing follows cycles.
We create. We refine. We try to make things better. Then sometimes we forget what came before and rediscover it again later.
It is a cycle, just like the cycle of the machine.
Understanding history helps you see where you stand.
Even thinking back to around 2012, tattoo supply catalogs were still part of daily shop life. You would sit down and flip through them, studying machines and tools. Before everything moved online, you ordered supplies by phone or fax. It required intention.
Those catalogs documented the craft. Looking back at them now shows how ideas evolve and reappear.
Looking Further Back
When you go deeper, you see the roots.
Edison’s electromagnetic stencil pen showed the principle of using coils for reciprocating motion. Wagner’s patent brought the idea into tattooing. Early builders adapted and refined.
Nothing appeared overnight. Each step built on the previous.
This perspective changes how you think about innovation.
The Myth Of Completely New
The contemporary builder who believes they have invented something entirely new may simply be revisiting an older idea in a different form.
History shows patterns repeating.
That realization is not discouraging. It is grounding.
It reminds us that innovation is often refinement.
The Builders
Looking through names like Walter Cleveland, Cap Coleman, Sailor Jerry, Owen Jensen, Jonesy, Doc King, Don Nolan, Ole Hansen, Eddie Funk, E.J. Miller, and many others, you see a network of people experimenting, sharing, and refining.
Some focused on mechanical solutions. Some influenced others quietly. Some supplied tools that allowed ideas to spread.
Progress came through many hands.
Paul Rogers
When you encounter Paul Rogers, you see a builder who studied the machine deeply.
He modified existing frames. Built from raw stock. Invested time and care into understanding behavior.
His approach reflects patience and attention.
That mindset still matters.
Knowledge Passed Through Hands
Much knowledge in tattooing was passed through conversation, demonstration, and shared experience.
Builders learned by watching and listening.
Those lessons remain embedded in machines today.
Returning To The Purpose
All of this leads back to a simple question.
What makes applying a tattoo better?
Better control. Better consistency. Better experience for both tattooer and client.
Every refinement in machine design serves that purpose.
Cycles In Craft
Ideas emerge. Builders refine them. Knowledge spreads. New generations revisit and push further.
Just like magnetic domains aligning and releasing, the craft evolves through cycles.
Understanding this helps maintain perspective.
Respecting The Continuum
Tattoo machines are part of an ongoing story. Each generation contributes while drawing from what came before.
Recognizing that connection encourages thoughtful work.
Obsession And Curiosity
When I think back to being younger, spending long nights experimenting, I realize how much of what I felt was tied to these invisible processes.
Now, being older and still completely obsessed, I see even more depth.
Curiosity does not fade. It grows.
The Machine In Your Hand
Every coil machine carries the influence of countless builders, experiments, and conversations.
When you tune a machine, you participate in that lineage.
That awareness brings a deeper sense of respect.
Final Thoughts
Coil machines are a blend of physics, material behavior, mechanical design, and human experience.
Understanding steel, magnetism, and history brings clarity.
Respect the materials. Pay attention. Learn from those who came before. Continue asking how the craft can improve.
When copper, steel, motion, and intention come together, the machine feels alive.And that is something worth understanding.