K40 CO2 40W China Laser und Engraver

Engraving glasses and bottles


Focus via the motor table

What is a Rotary and what is it used for? A Rotary is used to laser or label round objects such as wine bottles, glasses or aluminium thermos flasks.
A laser can only perform 4 movements: right - left and back and forth. The X-axis is responsible for the right and left movements, the Y-axis for the back and forth movements.
With round bodies such as bottles or glasses, the laser would quickly lose focus due to its round shape. That's what the Rotary is for, it turns the glass a little in the Y direction after each lateral movement.

There are several Rotarys to copy and download portals. But none of them could convince me. So then I have to do it myself.
In the K40 China Laser, there is not much height left below the laser table. This should be used to the maximum. If the height is not sufficient, the bottom of the K40 can also be retrofitted with the plasma cutter.

The first version was already fully functional. In the meantime, I have further optimised the Rotary so that the last mm in width and height can be used. Now wine bottles up to 0.7l can be engraved without removing the bottom of the machine.

Rotary ausgebautfokusierbar mit dem Lasertisch Rotary ausgebautRotary im K40 Laser eingebaut

Building instruction Rotary for the K40

Somehow you came across this article. Probably because you have a K40 laser and would like to engrave round objects like bottles and glasses.
I was faced with the same project as you and was pretty much biting the bullet. No one really wants to help you and otherwise only at horrendous prices. That's why I decided to conduct a little experiment.
I took the time to develop a rotary and share it with you. I put together a list of components and laser files and wrote this report. I spent a lot of time on this and I think that this should be rewarded. If I could help you with these instructions you are welcome to send me a small amount via PayPal to contact@cigarbox-guitars. I will then see by the number of downloads if this is only used by people
if someone thanks me for something or appreciates something. Depending on that I will continue to put projects online or do without. Of course I would be very happy if you give my Facebook page a thumbs up or even share it. Thank you and here we go.....

I use the motorised laser table that can be found on Thingverse. The Rotary is specially designed for this table. You will also find the corresponding report on these pages.
Attention: First check the dimensions of your laser table. If not, the Rotary has to be adjusted accordingly.


Parts list for Rotary

- Steppermotor 1.5A (17HS4401)
- 6 Kugellager 606ZZ 6 x 17 x 6mm
- 1 GT2 Riemen geschlossen 300mm
- 4 GT2 Timing Belt Pulley Aluminium 20 Zähne Bohrung 5mm
- 4 Gewindestange M5 je ca 300mm
- 2 Gewindestange M6 je ca 325mm (Antrieb)
- 2 Schrumpfschlauch passend zu M6 Gewindestange je ca 300mm
- 8 Gewindehülsen M5x20mm
- 4 Aluminium Rohr 7.5x1mm  ~280mm
- Aluminium Winkel 40x15x1mm  (Auflage auf Lasertsich)
- 3mm MDF
- 4 Innen 6-Kt- SchraubeM3x8mm mit U-Scheiben
- 8 Innen 6-Kt- Schraube M5x16mm
- 1 Innen 6-Kt- Schraube M5x30mm

First laser these components onto 3mm MDF

  Rotary 3Rotary 1Rotary 2

Always glue the two components together. Ideally, do this when you already have the ball bearings with you. This way you can apply the glue on one side and use the ball bearing to centre the components.
Note that one component has slightly larger holes. These are used to guide the threaded bushings. When the glue has hardened, the two lower holes must be countersunk a little on the outside so that the screws do not touch the laser table.
You are probably wondering why the motor mountings are also in the right-hand components? So that you can tension the belt without having to dismantle the whole Rotary. You only need to loosen the support bracket and then use the Allen key to loosen or tighten the screws through the holes. The slotted holes allow the motor to be pushed to the side so that the toothed belt can be tensioned.
Now you can cut the two support brackets to size and also countersink the two holes a little. Then assemble the Rotary. The threaded bushes are attached to the side parts with the Allen screws.
Does everything fit? You can now adapt the threaded rods and the lateral aluminium tubes to your table.

Rotary LinksAufhängung Links mit versenkten Löcher Rotary RechtsAufhängung Rechts mit versenkten Löcher

 Rotary MotorRotary mit seitlichem Ausschnitt für grüsse FlaschenRotary komplMDF Teile mit grösseren Bohrungen

A larger recess is provided on the right-hand suspension and on the motor mounting. This makes it possible to insert larger bottles into the Rotary. The bottle neck then lies under the aluminium profiles of the truck table.
So I could optimise the last mm and even bottles with a length of 330mm fit into the Rotary.

Adapter for conical glasses

Of course, there are also champagne glasses that do not fly cleanly on the Rotary due to their conical shape. For this I have built an adapter. This can be moved on the Rotary. There are some slotted holes for ball bearings.
are provided. So it should also be possible to put conical glasses straight on.

Rotary AdapterAdapter für konische GläserRotary Adapter eingebautAdapter zu Rotary Rotary Adapter mit Ausparung MotorAusschnitt für Motor für optimale Ausnutzung

What is a stepper motor?

The stepper motor is a stepper motor that moves by its step angle with each control. This step angle is indicated on the type plate, i.e. a 0.9° makes 400 steps and a 1.8° its 200 steps for one revolution.
The steps can then be specially controlled for whole-step operation, half-step operation, quarter-step operation or eighth-step operation,
Nema is a well-known cheap Chinese manufacturer and the number Nema17 that follows is only the size of the motor 42x42mm.

StepperStepper Motor als Antrieb für den Rotary

Where is the Rotary connected?

The rotary is driven by a stepper motor. This can be connected to the existing M2 Nano Board. For this purpose, the Y-axis (y-axis) that is not needed is unplugged and the retoary is connected to the socket that has become free. Attention: The stepper used should have a rated current < 2A. The Nano Board is not designed for higher currents and can otherwise be overloaded or even destroyed.

M2 Nano BoardStandard M2 Nanoi Moard

Help the Rotary turns continuously after switching on

No problem. In standard mode, the laser head always returns to its original position first. However, since we have exchanged the Y-axis for the rotary, the control expects the laser head to move to the end position in the Y-position and actuate the limit switch. So we have to trigger the limit switch manually. Some have a mechanical limit switch. My machine has an optical sensor. This is normally triggered by the metal construction. Take a piece of metal and hold it briefly between the two poles. The control system is already tricked and the Rotary moves into the start position.

Endschalter Y Axisoptischer Endschalter Y-Axis K40 CO2 LaserWhisperer

Attention: Before you move the laser head, you must always press the "Unlock Rail" button in the K40 Whisperer. This will unlock the stepper motors. Otherwise you will damage the mechanics.

The calibration

For calibration, it is best to draw a few squares and then send this file to the laser. I used a tin can for this and bordered it with masking tape.
Measure the caro after printing. Is everything correct? If the y-axis is not correct you can adjust it in the K40 Whisperer Settings. To do this, open the Settings > Rotary Setting tab or call it up directly with F4.
Select "Use Rotary Settings" and adjust the Rotary Scale factor if necessary. Then you can test the canister and the squares again and measure again.

Rotary K40ale Blechdose zur Kalibrierung des K40 RotaryRotary y AxisK40 Whisperer Rotary Settings

Prepare graphic for the Rotary

How can we determine the maximum size of the bottle surface to be engraved? We'll have to resort to the mathematical bag of tricks. What was that again. Calculate the circumference of a cylinder?
2* π *r. r stands for radius or half the diameter. This can be measured exactly with a caliper. For example, a bottle with a diameter of 70mm has a radius of 35mm. This results in 2x3.14x35 = 219.8mm.
The maximum width of the bottle or glass to be engraved can be measured directly.
Now a new sheet can be created in the graphics program with user-defined dimensions.

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