So I am wiring up my spindle here shortly, and will be grounding it. I ran some continuity tests from the spindle to the gantry, and I found some areas of the gantry have full continuity to the ground, while other areas of the gantry have none (180+ ohms). This is especially true of the rails, the…

Some users have reported when they ground their spindle and then attach the magnet for the touch probe it will complete the probe circuit and reversing the wires on the touch probe resolves the issue. Of greater concern IMO is that earth ground and the digital ground output of the controller seem t…

Only if it was fabricated incorrectly. There has been some incidence of that.

Kyle, I too have experienced the lack of HY grounding their spindles. Take it apart and add your own jumper to the spindle housing. When/if the spindle shorts to ground it is important to control the fault current giving it an easy path back to the VFD ground terminal. Purchase a small ground buss a…

I don’t have my rails grounded and see no reason to ground them. The black anodized aluminum parts would need to have the anodization removed to properly ground them. That includes where the tubes connect to them. The lead screw would also be difficult to ground. Going through the bearing is not…

[image] Dr-Al: I don’t have my rails grounded and see no reason to ground them The grounded spindle will provide a ground bond to the rails and machine assembly as well. Although not necessary having some path to ground via the metal chassis all be it poor (I measured about 25 ohms from the …

So I just wanted to update this thread with the answer I found for grounding… The answer is any points with more then 3 ohms requires a new ground. On my Journeyman, this means that the X & Y get grounded through a single ground. The Z/Gantry gets grounded through the spindle.

Thanks for the update Kyle. Could you share your source for the answer?

I emailed corvetteguy50 on youtube, who sells the wires for Spindles and offers tons of support on the topic. He stated that it should be 3 ohms or less for robotics. NEC calls for 5 ohms or less in circuits. Either way the ohms between the Z gantry and the X is 120 ohms. So a single ground from…

I’d still like to know the sources, like the specific NEC article being referenced. I am an EE and retired electrician and have never seen reference to these values. I get the idea someone can speak authoritatively on a subject but that doesn’t mean it’s correct information. It may fall in to the…

So I found NEC calls for 25 ohms, and on Flukes website they state that others with specialty equipment call for 5 ohms. When googling it I found 5 ohms repeatedly, but none talk about robotics. But again either way, if you are sitting on 120+ ohms that seems totally out reason for a ground. …

Proper Grounding; How have you grounded your frame?

Spindle/VFD (Aftermarket/Unsupported)

OnefinityCNC (Onefinity CNC Official ✅) August 25, 2026, 6:17pm 25

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Proper Grounding; How have you grounded your frame?

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