Hmm, your settings seem ok.
And it is strange since you can get a direct ethernet connection, so the static IP/ethernet port at the laser must be ok.
Everything seems to be pointing at the Pi and/or the connection from the pi to the laser.
Pi configuration issue?
-To be thorough - reflash the bridge image to the PI and try going though the bridge setup guide again.
Weak/bad connection from the laser to the pi?
-Check the cable is plugged in properly between the pi and the laser - disconnect and reconnect.
-Did you physically unplug the Wifi cable from the ethernet switcher port? Might help since @chill903 said it made a difference, maybe the switch is adding resistance or noise to the connection?
-For that matter you could try plugging the pi directly into the ethernet port of the Ruida motion controller - bypassing both the the external ethernet jack at the chassis and the internal Ethernet/Wifi toggle switch