(target-commutation-translation)=
# Commutation-Translation System
:::{image} ../../images/commutation-translation-system.svg
:alt: Commutation Translation System
:class: img-hardware-main
:align: center
:::
To minimise the tethering cable's interference with natural behaviour and prevent tangling during extended periods of recording, the Neuropixels commutation-translation system integrates the [ONIX commutator](https://open-ephys.org/commutator-info) with a servo motor-powered linear actuator, enabling closed-loop adjustment based on the animal's 2D position and head direction. 

## Parts list
:::{image} ../../images/commutation-translation-system-partlist.svg
:alt: Parts1
:align: center
:::
## Assembly guide
### Chute
::::{dropdown} Steps 1-3
:::{figure} ../../images/commutation-translation-system-step1.svg
:alt: step1
:class: img-hardware-steps
:figclass: caption-hardware-steps
1\. Assemble the cable chute by joining the acrylic base and sides.
:::
:::{figure} ../../images/commutation-translation-system-step2.svg
:alt: step2
:class: img-hardware-steps
:figclass: caption-hardware-steps
2\. Assemble the front cable chute support to the end of the chute as shown.
:::
:::{figure} ../../images/commutation-translation-system-step3.svg
:alt: step3
:class: img-hardware-steps
:figclass: caption-hardware-steps
3\. Attach the support to the end of the chute as shown. This will be connected to the aluminium extrusions. Step 1-3 require chloroform.
:::
::::

### Linear stage
::::{dropdown} Steps 4-10
:::{figure} ../../images/commutation-translation-system-step4.svg
:alt: step4
:class: img-hardware-steps
:figclass: caption-hardware-steps
4\. Prepare the 3D printed adaptor as shown.
:::
:::{figure} ../../images/commutation-translation-system-step5.svg
:alt: step5
:class: img-hardware-steps
:figclass: caption-hardware-steps
5\. Attach the adaptor to the sliding carriage of the linear actuator (ID 1).
:::
:::{figure} ../../images/commutation-translation-system-step6.svg
:alt: step6
:class: img-hardware-steps
:figclass: caption-hardware-steps
6\. Bolt the commutator to the adaptor (ID 2, ID 3).
:::
:::{figure} ../../images/commutation-translation-system-step7.svg
:alt: step7
:class: img-hardware-steps
:figclass: caption-hardware-steps
7\. Assemble the motor to the 3D printed motor bracket (ID 4).
:::
:::{figure} ../../images/commutation-translation-system-step8.svg
:alt: step8
:class: img-hardware-steps
:figclass: caption-hardware-steps
8\. Slide the coupler onto the motor drive shaft and tighten the grab screw.
:::
:::{figure} ../../images/commutation-translation-system-step9.svg
:alt: step9
:class: img-hardware-steps
:figclass: caption-hardware-steps
9\. Insert the motor bracket and coupler assembly onto the linear rail shaft and tighten the other coupler grab screw onto it.
:::
:::{figure} ../../images/commutation-translation-system-step10.svg
:alt: step10
:class: img-hardware-steps
:figclass: caption-hardware-steps
10\. Bolt a cable chain to the adaptor plate and to the 3D printed stopper (ID 5).
:::
::::


### Mounting
::::{dropdown} Steps 11-14
:::{figure} ../../images/commutation-translation-system-step11.svg
:alt: step11
:class: img-hardware-steps
:figclass: caption-hardware-steps
11\. Drill a hole in the middle of the aluminium extrusions and equip the linear rail groove with 3 insertion nuts. Bolt the aluminium extrusion to the rail.
Note: the chain cable stopper and motor bracket are bolted onto one of the three extrusions (ID 6).
:::
:::{figure} ../../images/commutation-translation-system-step12.svg
:alt: step12
:class: img-hardware-steps
:figclass: caption-hardware-steps
12\. Connect the cable chute to the assembled actuator via the front support by bolting to the extrusion.
:::
:::{figure} ../../images/commutation-translation-system-step13.svg
:alt: step13
:class: img-hardware-steps
:figclass: caption-hardware-steps
13\. Attach the chute side support to the chute itself and bolt it to the middle aluminum extrusion.
:::
:::{figure} ../../images/commutation-translation-system-step14.svg
:alt: step14
:class: img-hardware-steps
:figclass: caption-hardware-steps
14\. Attach the commutation system to the top of the Aeon habitat using three angle brackets. The positon should ensure that the cable falls in the centre of the habitat.
:::
::::

## Downloads
- [Assembly guide](../../downloads/Commutation-Translation-System-Guideline.pdf)
- [Bill of materials](../../downloads/Commutation-Translation-System-BOM.xlsx)