The project development

The whole Lemon squeezer machine was modeled, component by component, using Inventor software. This is the first step in creating a functional machine because we can visualize a preview and makes changes if needed. This is initial assembly.

The drum and squeezer working together.

Here is the working of the gear set in the assembly.

The component that will be the drum was 3D printed in a Makerbot 5th generation with PLA

The gear was 3D printed on Carbon fiber with Makforged 3D printer due to the requiremet of a durable and resistant material. Markforged Onix Carbon fiber behaves like a 6061 alluminium alloy. “”
The main motor that will generate the movement of all the machine.

The support for the DC motor made at week 4

The bendable guard was made in week 4, also designed on Inventor.

When laser cutting the mdf with this pattern we obtain a bendable structure known as kerf bending. This bendable structure will make part of the Lemon squeezer as the lemon hopper.

The piece with the ball bearing fitting perfectly. When I designed the piece on Autodesk inventor the external diameter of the hole was 35 mm but I put 35.4 mm instead. The 0.4 mm corresponds to hole on the extruder, made week 6.

Transmission gear.

Up date week 10
Two gears with the same dimensions are part of the gear set. The diameter is 110 mm , root diameter 106mm , height 20mm, teeth 53, module 2. This gear made on carbon and Kevlar.
Only one DC motor at 24v makes the system function, at 7.5 Amp. It moves the left hand of the drum from the squeezer and rotate the right hand.

The gear has a shaft to insert an hexagonal axis.

Two gear working together, the drum rotates left hand (orange ) and the squeezer rotates right hand (yellow).

Simulation squeezer and drum.

This simulation is very important because it shows the squeezer and drum working together and calculates the correct dimensions and the correct positions of the pieces.
Video. Simulation squeezer and drum. Right mouse button to play video

On the top of the machine.

On the top of machine we have other dc motor to rotate a cone to move the lemo. This will supply the machine with the stock. This second motor dc runs at 24 V.

The cone on the top, to throw the lemon to the feeder (blue and gold).

The feeder supplies with only one lemon to the drum.
This picture shows the fully assembled lemon squeezer machine.
This video show the simulation of all parts of the machine working together..

Simulation Lemon squeezer machine.
Right mouse button to play video


This is the last week. During this time I described the project development made on the lemon squezeer machine. I made the body with plywood, the main parts, like the squeezer, drum, feeder and containers were made on ABS. The top of the machine was made on PLA using a 3D printer. The two main gear were made out of carbon fiber. The two main shafts were fabricated with a lathe and a milling machine, on bronze. The shaft on the squeezer has two ballbearings, because it needs to support the force exherted by the motor. In my case, I made some parts during weeks of the academy.

Desciption of the machine.

This squeezer machine has a spinner on top which is connetced to a DC motor. This part rotates for the lemon to go out to the feeder. This part has an infrared sensor and two solenoids which work together in feeding the lemons one by one. This way, the lemon goes to the drum and the knife cuts the fruit in half. On half stays within the drum, and the other half rotates until it falls into the drum again. The squeezer presses the lemon with the drum and the juice falls into the container. This container has a grid or sieve to prevent the lemon seeds from falling. The squeezed lemon is then punched outside of the drum.


• Infrared proximity sensor.
• Two Allegro MicroSystem Hall Efect sensors.
• On-off switch.


• One DC motor at 24 V, 7 amperes.
• One DC motor at 24 V, 2 amperes.
• Two solenoids pistons.

The power.

• One DC power supplier at 24 V, 10 Amperes.
• One DC power at 5 V and 5 Amperes.


This machine has an ATmega328p microprocessor, within a modified satsha kit which controls 3 input devices and 4 output devicers for the operation of the machine. It uses one motor driver at 24 V , 15 amperes for the DC motor and one relay controller for both the solenoid pistons. The software was written in the arduino IDE.

Machines used for the final project.

• 5 pieces made on ABS.
• 3 pieces made on PLA.
• 3 pieces made on cabon fiber and kevlar.
• 2 axes made with brass and one for the collar to secure the squeezer axis.
• 13 pieces on plywood
• 5 pieces on MDF.

In this project there are:

• Body made with plywood cut in the Shop boot.
• 3D printer on PLA, ABS, carbon fiber with kevlar.
• Lathe made two axes and a collar.
• Milling machine made hexagon axis.
• The guard was made on MDF with laser machine.
• Two ballbearings for squeeze axis.
• Inventor as the CAD software.

Materials for this proyect.

• Plywood for the body.
• ABS for the feeder, drum, squeezer, container, grid.
• PLA for th spinner.
• Carbon fiber with kevlar for the gear.
• Brass for the axes.


This machine works fine currently, but this model is only a prototype. The lemon is ripped apart by the knife. I will work on improving that part in the future.

Description: Diferent part.

The body.

The body was made on 3 mm thick plywood. The width is 30cm for all 6 sides. This makes the body a cube.

Fig 1. The model parts on the V-Carve software.

Fig 2. Set point on the router shopbot.

Fig 3. The router run with 3mm tool.

The Guard.

The guard was made on a Laser cutter. I cut the four parts for the top of the machine. The guard is flexible. The material is 3 mm thick MDF.

Fig 4. The machine cutting the design, flexible guard desinged in inventor.

Fig 5. The piece assembled as the support for the DC motor.

Fig 6. This piece supports the principal DC motor on the squeeze machine.

Fig 7. Flexible Guard

The shaft.

I made both axes on bronze. For this purpose, I used a lathe and a milling machine. The firt step is lathing the material to a diameter of 17mm. The next step is using the milling machine with a divider head for making an hexagonal shaft.

Fig 8. Divider Haed for making the hexagonal shaft.

Fig 9. Lathing the shaft.

Fig 10. Lathe running with the shaft which will propel the squeezer machine.

Fig 11. Milling the hexagonal shaft.

Fig 12. Axis, squeezer and gear.

Fig 13. Rowlock made on PLA with 3D Printer for the axes of the squeezer machine.

Fig 14. Rowlock made on ABS with 3D Printer for the axes on the squeezer machine.

Fig 15. Axis, drum and gear.

The Drum.

This part holds the lemon for cutting it in half. I had to trim the interior psrt of the drum, so that the feeder can throw the lemon outside.

Fig 16. The drum moments before it was printed on PLA.

Fig 17. The lemon in the drum.

The Gear.

This gear was made with carbon fiber in a Markforge 3D printer. This gear has 53 teeth. This material is very hard, and that hardness is necessary for the tramsmition part.

Fig 18. Gear made on carbon fiber.

Fig 19. Gears working close together.

Fig 20. The gear with the transmition axis.

Fig 21 . The axis on the DC motor.

DC Motor.

The DC Motor works with 24 Volts and 7 Amperes. When it’s powered, the DC motor uses about 10 Amperes.

Fig 22. DC motor inside the machine.

Fig 23 The DC motor assembled on the frontal part of the machine.

The Feeder.

The feeder has two solenoids, which feed the lemons one at a time. It also has an ultrasonic sensor to detect whether or not the lemon is inside of the machine.

Fig 24. The inside of the Feeder.

The squeezer.

This piece was made with PLA. It is not so strong, this is the main problem with the machine because it can be easily broken.

Fig 25. The sqeezer on the machine

Fig 26. Collar for the axis and the ballbearing.

Fig 27. The collar on the axis.

Fig 28. Assembling thi axis.

Fig 29. The second ballbearing on the machine.

The top on the machine.

This part distributes the lemon to the feeder.

Fig 30. This part needs to be attached to the second DC motor.

Fig 30. This part needs to be attached to the second DC motor.

Fig 31. This an example, this part will be made on carbon fiber, so as to support extreme forces.

Fig 32. This bronze has a prisioner bolt, so it attaches to the axis.

Fig 33. The piece through the plate. This plate was made on a PLA 3D printer.

Fig 34. This example shows all of the parts integrated.

Fig 35. The topof the machine, the spin, made with PLA on a 3D printer.

Fig 36. The spin on the printer, the printing time was 20 hours.

The Electronic and power.

Fig 38. The power supply for the motor. 24 V and 10 Amp.

Fig 39. Power suply for the electronic components at 5 V and 5 Amp.

Fig 40 . Driver for the motor. 15 Amp.
The board I used the miny satscha kit whit extra pin for positive and negative and led aditional for the power and extra led on dgital pin 13, the resistor for the led 1k ohm.

Fig 41 . The scahematic for the litle satscha kit.

Fig 42. The miny satscha kit, one led indicate the power.

Fig 43. The board for the squeeze machine.

Fig 44. Mini Satdchakit

Fig 45. Hall efect sensor A3144 Allegro

Fig 46. Hall efect sensor on puller.

Fig 47. Hall efect sensor on container.

Fig 48. Infrared Proximity Sensor on the feeder.

Fig 49. Back squeeze machine.
  • Download files here:
    Mini Satscha board.
    Mini Satscha Shematic.
    Firware for the Lemon Squeeze Machine.

  • Final Video

    Video: Lemon Squeezer Mahine
    Right mouse button to play video

    Return: Final Proyect

    Read More
  • Download files here:
    Files on Inventor 2017
    Safe guard.
    Support part.
    Click on