Lathe motor versus Focusrite DAC electrical gremlin

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EmAtChapterV
Posts: 262
Joined: Sun Jan 06, 2013 6:49 pm
Location: Vancouver, BC

Lathe motor versus Focusrite DAC electrical gremlin

Post: # 65712Unread post EmAtChapterV
Fri Sep 13, 2024 8:27 pm

Here's a weird one that's just started happening in the past couple of days: whenever I switch on the motor of my Rek-o-Kut V/ M5S, the Focusrite digital audio interface disconnects from my computer on the other side of the room. Click the switch on, hear the little "beep-boop" from my PC, and have to walk over to click a dialog box to get it to find it again. The lathe and the PC are not even on the same circuit! Totally different breakers on the panel out in the hallway, I double-checked.

The motor is just a regular old synchronous motor about the size of a one-litre soup can or Folgers can. It's never given me any problems. Motor run cap is vintage but still 100% within spec. Motor and stylus heat circuits don't interact with the cutting circuitry in any way. This is a new head-scratcher for sure. :?
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dmills
Posts: 208
Joined: Sun Jun 16, 2019 3:33 pm
Location: Uk

Re: Lathe motor versus Focusrite DAC electrical gremlin

Post: # 65716Unread post dmills
Sat Sep 14, 2024 6:34 am

Fit a snubber across the motor or switch, this is an RFI issue due to the general shitness that is the USB electrical interface, easiest to clean it up at source.
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