The Perfect Pairing: Matching Needle Groupings to Machine Stroke and Voltage

When it comes to professional tattooing, the success is measured by the ratio of the so-called Technical Trinity, viz., Machine Stroke, Needle Grouping, and Voltage. When one of them is off, you will be dealing with a lack of smooth lines, uneven coloring, or worst, with too much skin trauma.

Knowing up to what extent each of these three variables interacts with the others will enable you to cease banging your head against your equipment and begin creating with accuracy. This manual is a breakdown of the science of matching your equipment to fit the best.

How does machine stroke length affect needle penetration?

Momentum and depth of hit are dependent on the length of the stroke (the distance that the needle is in contact with the surface).

Short Strokes (2.5mm - 3.0mm): They are more rapid but have less "punchy-ness." They are best on smooth areas or where to blend and a gradient, where you do not want to scrape with the skin as opposed to crushing.

Medium Strokes (3.5mm): The all-purpose. This will give it sufficient power to line and solid shade in most styles.

Long Strokes (4.0mm - 4.2mm+): These give the highest torque. The long stroke is also necessary to provide large groupings on hard skin regions without the machine bogging down.

Why do larger needle groupings require a longer machine stroke?

It is all a matter of surface area and resistance. Accuse one needle of being a pin, another, a 25-Magnum, a rake. A single pin was easily pushed into a surface with just a little force; however, it would require a lot of force to push 25 pins in at once.

The resistance is high in the skin when you are using large groupings (such as 15+ Magnums or bold 14-Round Liners). Long stroke (4.0mm or more) provides the machine with sufficient "swing" to generate the momentum to force the ink to penetrate that resistance to take root within the dermis.

When you employ a short stroke, and the grouping is large in size, then the needles are apt to bounce off the skin or hook into it and create saturation-free trauma.

What is the ideal voltage range for different needle groupings?

The speed of the machine is controlled by voltage. Although all machines vary, the general principle is that bigger groupings need more power (voltage) to sustain the speed due to friction against the skin.

Table 1.1 Voltage range as per needle

How do I know if my voltage is mismatched for my machine stroke?

Your machine will most likely be able to inform you via sound and touch.

Voltage Too High: When your machine is swarming like a swarm of angry bees, and you are seeing spatter or excessive bleeding, you are moving your hand at an extremely unreasonable speed. This causes the needle to strike the same location excessively, causing hamburger skin.

Voltage Too Low: When the machine sounds like it is trying hard or when your pitch sounds lower when you touch your needle to your skin, then you have not used enough voltage to overcome the resistance of your grouping. It is also probable that you may have snagging, which is the sticking of the needle in the skin with a pull.

How does skin type change the pairing of voltage and stroke?

Skin is the final variable. Coarse, tanned, or thick skin (such as on elbows or knees) will need an extended stroke and more voltage to get into the dermis. On the other hand, thin or soft skin (such as inner arm or ribs) means that you have to reduce your voltage or use a machine with less "give" to avoid blowouts.

Conclusion

The art of learning to combine the needle groupings in conjunction with the machine stroke and voltage is what distinguishes the technician as the artist. You take care of your saturation caused by the best usage of your hand speed and the least amount of trauma by matching your stroke with the resistance of your needle grouping and tuning your voltage to your hand speed. Note: begin with the low voltage and keep on increasing until you have the sweet spot where the ink flows smoothly.

FAQs

Can I use a 4.2mm stroke for everything?

So do many of the modern artists, particularly with high-end rotary pens. Nevertheless, shading with a long stroke to create a soft, multi-layered effect would be extremely difficult to control with the hands. A long stroke is unforgiving; do it too deeply, or too slowly, and you will bring about permanent scarring. The majority of the professionals use a 3.5mm stroke as realistic and 4.0mm and above as traditional stock-out.

Why does my machine run hot when I use large magnums?

This is usually an indicator of a voltage-resistance mismatch. When you are attempting to propel a large 25-Mag utilizing low voltage or a brief stroke, the motor will have to draw greater current to keep the speed, and will overheat. This can be solved by increasing your voltage or by changing to a machine using a stronger motor (high torque).

Do "Bugpin" vs. "Standard" needles change my voltage needs?

Yes. Needles Bugpin needles are finer ($0.30mm$ vs. regular $0.35mm). They are thinner, hence generating less resistance. It is often possible to generate the same saturation with bugpins with your machine running at a lower voltage than with your standard needles at a higher voltage.

How does the "give" of a machine factor into this?

The machine has the feature of bouncing back when it meets resistance, which is called give. When your machine has adjustable give you can run it on a higher voltage to run faster, but the give cushions the skin so that you are not hit too hard. It serves as a safety margin for the three-stroke, grouping, and voltage.