---
title: "Robot DC: The nipple arms move forward and backward on the same set of spokes"
description: The nipple arms move forward and backward on the same set of spokes after they have already worked on them
---

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# Robot DC: The nipple arms move forward and backward on the same set of spokes

## The nipple arms move forward and backward on the same set of spokes after they have already worked on them

There are two sensors in the nipple arms: one detects the forward movement, and the other detects the return. When the arm moves forward, one sensor should be on and the other off. When the arm moves back, the first sensor should turn off and the second one should turn on.  
The machine is attempting to return the arm to the same position twice or more

see example:

<iframe data-hsv-src="https://play.hubspotvideo.com/v/5340083/id/151976526764" referrerpolicy="origin" sandbox="allow-forms allow-scripts allow-same-origin allow-popups" allow="autoplay; fullscreen;" style="position: absolute !important; width: 100% !important; height: 100% !important; left: 0; top: 0; border: 0 none; pointer-events: initial" title="HubSpot Video" loading="lazy" data-hsv-id="151976526764" data-hsv-style="" data-hsv-width="352" data-hsv-height="640" data-hsv-autoplay="false" data-hsv-loop="false" data-hsv-muted="false" data-hsv-hidden-controls="false" data-hsv-full-width="false"></iframe>

To avoid this, try adjusting your sensors :

<iframe data-hsv-src="https://play.hubspotvideo.com/v/5340083/id/151978175586" referrerpolicy="origin" sandbox="allow-forms allow-scripts allow-same-origin allow-popups" allow="autoplay; fullscreen;" style="position: absolute !important; width: 100% !important; height: 100% !important; left: 0; top: 0; border: 0 none; pointer-events: initial" title="HubSpot Video" loading="lazy" data-hsv-id="151978175586" data-hsv-style="" data-hsv-width="688" data-hsv-height="312" data-hsv-autoplay="false" data-hsv-loop="false" data-hsv-muted="false" data-hsv-hidden-controls="false" data-hsv-full-width="false"></iframe>

Keep in mind that it is also possible that the cylinder is faulty or that something is blocking the movement. 

 

 

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