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# Assemble the actuators

There is one "actuator column" for each of the three axes of the OpenFlexure Microscope stage. These allow you to move the sample in X and Y, or focus the microscope by moving in Z.

## For this section you will need:

### Printed Parts

- 3 feet - Each actuator has its own labelled foot.
- 3 large gears

### Printed Tools

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

### Sub-Assemblies

- 1 prepared main body

### Consumables

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

### Mechanical Components

- 3 M3 brass nut
- 6 M3 stainless steel washers
- 3 M3x25mm stainless steel hex bolt
- 3 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.
- Looking through the hole you should see the side of the nut. If it is tilted so you can see the top can tap the microscope until it sits flat.

## Step 2: Attach the gear

- Line up two washers so that the slightly curved sides are facing each other.
- Take one of the hex bolts
- Push it through one of the large gears and then the 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 until the nut is completely lifted up. (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: Assemble the band insertion tool

- Insert the two arms of the band tool into the band tool cover.

## Step 5: Prepare the actuator

- Look through the hole you inserted the nut into
- You should be able to see the screw thread of the hex bolt
- Rotate the gear until the screw is clearly visible through this hole
- Push the nut tool into the hole to hold the internal actuator in place

## Step 6: 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 assembled band tool through the foot and hook the band onto the tool on each side.
- 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 7: 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 8: Repeat this process for Y and Z

Follow the same procedure for the Y and Z axes. Once complete the microscope with assembled actuators should look like this:

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