On Mar 5, 2023, at 5:11 PM, David P. Best <dbestworkshop@...> wrote:

?Well, to be honest with you, your machine is producing a lot of low frequency noise with just the main saw arbor running. ?I hear a loud rumble at 117 Hz which sounds like the electronic brake is engaged, but I suspect it’s not the brake but something else. ?Given the frequency, it seems suspiciously electronic in nature. ?The wine of the scoring saw motor is an octave above at 234 Hz. for several seconds. ?This leads me to think the noise is electrically related. ?Sorry that’s not much help, and is certainly speculative.

I’d be interested in seeing/hearing a video from someone else who has a single-phase K700 and listening to what that machine sounds like. ?Does anybody else anyone who has listened to these videos have the same negative reaction to the low pitched/loud rumble going continuously?

David Best
DBestWorkshop@...
https://www.flickr.com/photos/davidpbest/collections/
https://www.youtube.com/@David_Best

On Mar 5, 2023, at 1:48 PM, Aaron Inami <ainami@...> wrote:

Okay, new videos.? I removed all blades so that we can hear exactly what the motors are doing.

K700S without scoring motor - all blades removed:


K700S WITH scoring motor - all blades removed:


The buzzing on the scoring motor stops after 5 seconds and sounds similar to the noise I hear while I hold-down the power button for the main motor startup-capacitor.? This leads me to believe that the circuit is cutting out the scoring motor starting capacitor at that point.? The sound after is quieter, but still has a slight buzzing character.?

-Aaron