Rotary machines

“Eternal” Direct Drive Rotary Machine

The simple, small and efficient machine is a modern version of the old school
direct drive rotary machine, loaded with some of the highest quality components
available on the market today. This lightweight machine is ideal for both lining or fill work.

  • Direct drive powered by 19mm Maxom Swiss motor
  • 3.5mm stroke
  • 10mm German sealed bearing
  • High quality brass construction
  • Clip Cord connection
  • All made in Europe
  • Manufactured by HM Tools & Dye

Requests from OUTSIDE Europe:

For Europe:

eternalrotary_directdrive_assembled eternalrotary_directdrive01 eternalrotary_directdrive02 directdrive_inboxes






Small, lightweight and powerful, the Invictus Micro-Glide boasts that it can do
what all other machines only say they can do. Manufactured by HM using 100%
European parts the Micro-Glide is available in three stroke lengths.

2.6 mm (short stroke) – Smooth Black & Grey shading
3.4mm (medium stroke) – Coloring and Solid Black Work
4.2mm (long stroke) – Lining, Whip Shading and traditional coloring work

  • CNC machined from 7075 Aviation grade Aluminum.
  • Slide system and needle bar retainer manufactured in durable hi-density Delrin.
  • German 17mm FAULHABER motor exclusively designed & tested between FAULHABER & HM Manufacturing.
  • Comes complete with a HM RCA  cable.
  • Weight: 90g/3.17oz
  • Engraved Eternal logo
  • Packaged in tin container

Requests from OUTSIDE Europe:

For Europe:







Introducing the WELKER ROTARY. The future has arrived.

The Welker Rotary is a precision-made tattoo machine. Here are a few of the key features:

  • All American aircraft grade 6061 aluminum and 304 stainless steel construction (no plastic parts)
    similar to medical grade instruments.
  • All American made 440 stainless steel bearings.
  • Powered by top of the line German made Faulhaber DC micro-motor
    with 2.6 Watt of output power and 9900 rpm of no-load
    speed @12volts.  Machine will run approximately at 125cps @12 volts and drop approximately
    14 cps per 1 volt reduction in power fully loaded up with needles working the canvas.
  • RCA power connection
    (clip cord connection not advised and will void warranty if an attachment is used).
  • Needle retention devise locks to the left and right to facilitate needle loading.
    The amount of  pre-bend given to the needle determines tension. The retention system
    can be used in the loaded (tension) position when using a t-tech type
    of adaptor for exchangeable needle tips as the guide wheel of the retention
    system guides the needle down the center of the tube.
  • Crankshaft driven forward and rearward slides.
  • Comes in 4 different strokes: Short-  2.5mm(.100”), Medium- 3.2mm(.125”), Long- 3.8mm(.150”)
    and Extra Long- 4.5mm(.175”).
  • Comes in 8 different colors.
  • Weighs 120g ( 4.25oz)
  • Produced in house at Welker machines a division of Eternal Ink Inc.
  • Technical Patent Pending drive system.

The internal (rearward) slide cancels out the up and down forces generated by the
front slide and needle movement. This is achieved by matching the mass of the
internal (rearward) slide to the mass of the front assembly (front slide,  needle and rubber nipple).
Across the whole range of motion  regardless of chosen stroke or running speed the
internal (rearward) slide and front assembly (front slide, needle and rubber nipple) move
in opposite directions of each other at a mechanically matched speed and distance
effectively canceling out the hopping action associated with the up and down
movement of the needle.
The crank shaft has two journals driving a desmodromic type system.
The crankshaft is supported on one end by the motors internal bearings and the other
end supported by a stainless steel pilot bearing effectively taking the full load of the
forces involved with decelerating , reversing and then accelerating the masses at
140Hz (cycles per second) off the end of the motor shaft and displacing it between the
motor and the pilot bearing effectively eliminating any applicable motor and drive shaft flex.
The crankshaft journals driving the front and rear slides are arranged 180 degrees
opposed to each other giving the crankshaft a natural balance.


The Welker Rotary is referred to as being Dual-Plane Balanced.

Our Rotary Dual-Plane Balancing system eliminates the up-and-down shaking
caused by the needle and armature bar often associated with a coil tattoo machine.
Unlike other standard rotary machines, the up-and-down shaking caused by the
movement of the front slide, has been cancelled out by our Dual-Plane design.
On a standard rotary machine, the side-to-side shaking, (the motion that unfortunately
draws ink up and out the top of the tube of a rotary machine), is a result of an eccentric
cam-type drive system attempting to balance the up-and-down motion. This too, including
the leaking ink, has been canceled out by our Dual-Plane design.
Therefore, after canceling these effects, we achieve a stable platform of operation
with all components working within their optimal range. Not only does this vastly
reduce the fatigue experienced by the artist, it also reduces the stress on the motor
from shaft flex and various other factors as well.


We encourage our Welker Rotary machines to be run at speeds equal to coil liner
and shader machine speeds. The optimal range of operation is between 9.5 volts
and 10.5 volts for shading and 10.5 volts to 12 volts for lining.
We have found that artists tend to start at lower voltages due to their previous
experiences with rotary machines. Once an artist starts to become familiar with
the Welker Rotary machine, they naturally begin moving toward the normal
operating speeds that coil machines are tuned to perform.

Made in the USA