# Spindle/Z Slider dropping / Spindle drop down on Poweroff/Estop (Elite Series) **URL:** \ **Category:** Spindle/VFD (Aftermarket/Unsupported)\ **Created:** [April 6, 2023, 12:13am UTC](https://forum.onefinitycnc.com/t/spindle-z-slider-dropping-spindle-drop-down-on-poweroff-estop-elite-series/19878 "2023-04-06T00:13:46Z")\ **Posts on this page:** 1\ **Showing post:** 120
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [August 21, 2023, 5:53am UTC](https://forum.onefinitycnc.com/t/spindle-z-slider-dropping-spindle-drop-down-on-poweroff-estop-elite-series/19878/120 "2023-08-21T05:53:37Z")
Hey Captain, > [@Captain](#): > > Is this putting my z stepper at risk? I don’t think so. When an electric motor is turned, it acts as a generator, so the only thing that could get harm would be the semiconductors in the driver, but I don’t think the little amount of current would do harm and I assume the driver has some incoming current protection. For my setup I will use a stepper motor with integrated brake but I don’t plan to update to a Z-20 assembly. I rather will replace the entire Z assembly [with something else](https://forum.onefinitycnc.com/t/using-the-cncdepot-spindle-z-20-gantry-rework/19948/3). The good thing is, for Onefinity Original Series, a version of the open-loop stepper with integrated brake [is available](https://www.omc-stepperonline.com/nema-23-stepper-1-26nm-178oz-in-w-brake-friction-torque-2-0nm-283oz-in-23hs22-2804d-b200) (unlike with the Masso steppers) > [@Captain](#): > > I don’t like the idea of potentially damaging my work if I have to push the e-stop As I elaborated somewhere in the forum, usually for a machine like a CNC there should be implemented a stop category that considers the risk assessment. And this would be a stop mode that does _not_ let the steppers run freely, but hold their position. In terms of safety, an estop that lets the spindle crash down is a nightmare. --- _[View the full topic](https://forum.onefinitycnc.com/t/spindle-z-slider-dropping-spindle-drop-down-on-poweroff-estop-elite-series/19878)._