# Z dropping during carve **URL:** \ **Category:** Original/PRO Series (Buildbotics) (Gen 1)\ **Created:** [November 30, 2023, 6:20pm UTC](https://forum.onefinitycnc.com/t/z-dropping-during-carve/23717 "2023-11-30T18:20:12Z")\ **Posts on this page:** 1\ **Showing post:** 11
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [December 1, 2023, 9:54am UTC](https://forum.onefinitycnc.com/t/z-dropping-during-carve/23717/11 "2023-12-01T09:54:36Z")
Hey RyMoe, > [@RyMoe](#): > > It’s not a molex problem on my machine because all of my cables are tied down or in a way that there’s no pull on the connectors. Excellent, but [the connectors used on the Onefinity (what is needed to make new cables yourself)](https://forum.onefinitycnc.com/t/z-axis-not-cutting-to-depth/14238/5#make-your-own-stepper-motor-cables-1) remain connectors made only _for internal device use_ (and not for cables going outside of the device) and they are made to be plugged together exactly **once**. Because they are only tin-plated, re-seating them multiple times may damage the thin tin-plating and expose the bare copper to air humidity which is even more susceptible to oxidation (tin already is), and metal oxides are no more an electric connector ([see also here](https://forum.onefinitycnc.com/t/voltage-present/8599/18)). > [@RyMoe](#): > > What do people who run shop vacs do for emi? I’ve never seen an actual post about what works. The reports here in the forum usually say that grounding the machine properly made the static electricity when touching the machine disappear. Use the search function (e.g. for “[EMI solved](https://forum.onefinitycnc.com/search?q=emi%20solved)”) Usually you can’t avoid the buildup of static electricity inside the dust collection system (by principle, except if using metal tubes in your workshop dust collection system), and **it is impossible to ground PVC hoses and tubes** (despite what is told on youtube). See the video of John McGrath in the link below. He also tells what you can do if it persists. **But usually it is reported here that the static electricity when you touch your machine disappears if you correctly ground your machine. For a machine that is assembled by the operator and that is a [class I device](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099/3), it’s the operator’s duty to comply to [IEC 60204-1](https://en.wikipedia.org/wiki/IEC_60204) and to [ground and bond all moving parts](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/22) individually to comply to safety regulations.** If you follow the threads linked below entirely, you will also see that grounding the moving parts of the machine is also necessary to prevent motor bearing currents that can damage your spindle. [E.g. this issue](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/17) was only discovered **after properly grounding the frame**. Without that, it remained undiscovered, but led to axis positioning errors (as you can imagine). Please follow these links for the information mentioned above: - [Static electricity in a router](https://forum.onefinitycnc.com/t/static-electricity-in-a-router/22789/2) - [Proper Grounding; How have you grounded your frame?](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/22) - [What you need to ground your Onefinity Machine](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099/8) > [@X axis slop journeyman 50](https://forum.onefinitycnc.com/t/x-axis-slop-journeyman-50/23681/5): > > the total lack of any cable shielding is unusual in the industry (for this reason), the same with **not** enclosing a [VFD](https://en.wikipedia.org/wiki/Variable-frequency_drive) in a grounded [VFD Control Cabinet](https://forum.onefinitycnc.com/t/hey-is-this-your-vfd-enclosure/10130/3). Also a seller of a machine that has to be assembled and made functional by the operator and is a [class I device](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099/3) should provide instructions for [Proper Grounding; How have you grounded your frame?](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/22) and for [What is needed to ground your Onefinity CNC machine](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099/8). > > I would never put a Onefinity CNC into service in its delivery state. Even if it’s assembled according to the [manual](https://www.onefinitycnc.com/_files/ugd/1cee9f_c602e6130f1d4b7ebc2f8795f50f77a4.pdf). I would at least [retrofit the lacking strain relief](https://forum.onefinitycnc.com/t/strain-relief-for-x-gantry-molex-connectors/11461) on the connectors that are subject to permanent movement, and [ground and bond all moving parts](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/22) of the machine. Many lost steps and thus, lost workpieces, as well as static electricity induced by the dust collection, reportedly disappeared after grounding the machine properly. --- _[View the full topic](https://forum.onefinitycnc.com/t/z-dropping-during-carve/23717)._