# MAX 180 Degree Gearbox Assembly The 180 Degree Output can be assembled with two different Ratios, a 1:1 ratio for balance output and a 2:1 Ratio when more torque is needed. The two Ratios require separate assemblies, both are detailed below. ## 1:1 Ratio Assembly | 1) Add two 8mm Shaft Spacers to the NEO Brushless Motor output shaft. |


| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- | | 2) Insert the NEO Shaft Key. | | | 3) Slide the 1/2 Hex Shaft Adapter to the NEO output shaft. | | | 4) Fasten the base plate to the NEO using the left holes in the base plate and two #10-32 x 1/2in screws with a 1/8in Allen Key. |


| | 5)Press a Flanged Bearing into the base with the flanged side opposite of the NEO. | | | 6) Press a 1/2in Hex Through Bore Shaft into the Flanged Bearing. | | | 7) Slide a 1/8 MAXSpline Spacer onto the 1/2in Hex Through Bore Shaft. | | | 8) Screw together two MAXSpline Pulley halves with six M3x12mm screws. |


| | 9) Screw together two MAXSpline to 1/2 Hex Adapter halves with two #12-32x1/2in Socket Head screws with a 5/32in Allen Key. |


| | 10) Screw together two MAXSpline Pulley halves with six M3x12mm screws. |


| | 11) Place the 48-tooth RT25 Belt around both the NEO Pulley and MAXSpline Pulley, then slide them onto the Output Shaft of the NEO and 1/2in Hex Through Bore Shaft at the same time. | | | 12) Secure the NEO Pulley with a Retaining Ring. | | | 13) Slide a 1/8 and a 1/16 MAXSpline Spacer onto the 1/2in Hex Through Bore Shaft. | | | 14) Press a Bearing onto the 1/2in Hex Through Bore Shaft. | | | 15) Press the Pulley Cover Plate onto the 1/2in Hex Through Bore Shaft Bearing. | | | 16) Secure the Pulley Cover Plate with three #10-32 x1-1/2in screws and #10 Spacers using a 1/8in Allen Key. | | ## 2:1 Ratio Assembly | 1) Fasten the base plate to the NEO using the right holes in the base plate and two #10-32 x 1/2in screws with a 1/8in Allen Key. |


| | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------------------------------------------- | | 2)Press a Flanged Bearing into the base with the flanged side opposite of the NEO. | | | 3) Press a 1/2in Hex Through Bore Shaft into the Flanged Bearing. | | | 4) Slide a 1/8 MAXSpline Spacer onto the 1/2in Hex Through Bore Shaft. | | |

5) Press a Retaining Ring onto the the Output Shaft of the NEO.

Please Note: You will adjust this placement later in step 7.

| | | 6) Screw together two MAXSpline Pulley halves with six M3x12mm screws. |


| |

7) Place the 40-tooth RT25 Belt around both a 12tooth-RT25 Pulley and MAXSpline Pulley, then slide them onto the Output Shaft of the NEO and 1/2in Hex Through Bore Shaft at the same time.

Please Note: Adjust the Retaining Ring on the shaft of the NEO to make the 12tooth-RT25 pulley level with the MAXSpline Pulley.

| | | 8) Secure the 12tooth-RT25 Pulley with a second Retaining Ring. | | | 9) Slide a 1/8 and a 1/16 MAXSpline Spacer onto the 1/2in Hex Through Bore Shaft. | | | 10) Press a Bearing onto the 1/2in Hex Through Bore Shaft. | | | 11) Press the Pulley Cover Plate onto the 1/2in Hex Through Bore Shaft Bearing. | | | 12) Secure the Pulley Cover Plate with three #10-32 x1-1/2in screws and #10 Spacers using a 1/8in Allen Key. | | --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.revrobotics.com/ion-build/build-guides/max-180-degree-gearbox-assembly.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.