# Assemble the actuators

There is one "actuator column" for each of the three axes of the OpenFlexure Microscope stage. The x and y actuators allow you to move the sample in x and y. You can focus the microscope by moving in z via the separate rectangular z-axis which is inverted and placed on top of the z-spacer on top of the z-axis of the main body.

## For this section you will need:

### Printed Parts

- 1 Rectangular z-axis
- 4 feet - Each actuator has its own labelled foot. We require 1 x foot, 1 y foot, and 2 z feet.
- 4 large gears

### Printed Tools

- 1 band tool
- 1 band tool cover
- 1 nut tool

### Sub-Assemblies

- 1 prepared main body

### Consumables

- 4 drops of light oil - - Don't skip this or you will damage the screws

### Mechancial Components

- 4 M3 brass nut
- 8 M3 stainless steel washers
- 4 M3x25mm stainless steel hex bolt
- 4 Viton O-ring (30mmx2mm) - - "Viton band"

## Step 1: Insert the nut

- Insert a brass nut into the x-actuator through the hole in the front of the main body.
- Look through the hole you should see the side of the nut. If it is tilted you can tap the microscope until it sits flat.

## Step 2: Attach the gear

- Take one of the hex bolts
- Push it through one of the large gears and two washers
- Push the screw through the hole at the top of the x-actuator until it reaches the nut
- Screw the bolt into the nut (If the nut turns hold it in place with the nut tool)

## Step 3: Oil the lead screw

- Lift the gear so you can see about 5mm of screw thread underneath
- Add one drop of light oil onto the screw thread

## Step 4: Prepare the actuator

- Look through the hole you inserted the nut
- You should be able to see the screw thread of the hex bolt
- Rotate the gear until the screw is clearly visible through the hole
- Push the nut tool into the hole so the internal part cannot move

## Step 5: Attaching the viton bands and foot

This is the trickiest part of the microscope build. In this step we will clip bands onto hooks inside each actuator.

- Take the foot for the x-actuator
- Loop a viton band through the foot
- Push the band tool through the foot hook the band onto the tool on each side.
- Push the band tool cover onto the bottom of the band tool
- Align the foot under the microscope so that the letter faces outwards
- Check that the nut tool is still blocking the actuator column.
- Push the band tool into the microscope until it clicks
- Remove the band tool.

If you had problems with this step see [troubleshooting actuator assembly].

## Step 6: Seat the foot

- If the foot did not click into place during actuator assembly align it and push it into place
- The foot should sit flush with the base of the microscope
- The front of the foot should align with the front of the actuator

## Step 7: Repeat this process for y and z

Follow the same procedure for the y and z axis in the main body and the Rectangular z-axis. Once complete the actuators should look like the following image of the complete rectangular z-axis:

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