and good afternoon YouTube this is my main bench grinder or I have it on a
pedestal here and when I first got this grinder it was extremely smooth
and quiet and now it's gotten a little bit noisier so let me flip it on here
so that's part of the problem here is that this horse grinding wheel got a little bit
out of round so I've been trying to true it back up again this one had actually loosened up but I
think all of these things are actually symptoms of the real problem and you can see right here
there's a slight bit of movement in the two bolts I use to hold it down to the pedestal they just
barely move but I think what's happened is there must be a couple of screws or bolts up through the
base into the motor housing and that's where the motion is you can see it's right there so
this whole thing is loose and I think it was that vibration caused the nut holding the source wheel
to loosen up and then that caused this wheel to get out around which made the vibration worse and
it just got to the point where it was really bad I think what I'm going to do is I'm gonna unplug
this take out the two bolts that hold it down to the pedestal and then see if I can find the bolts
that go up into the motor and while I'm there this grinder has a nice light on it I put an LED bulb
in here because they seem to handle the vibration a lot better I used to put a filament bulb even a
heavy-duty filament bulb and the vibration of the grinder would break the filament when it
was also I really like this light you know you can move it down it put it down so you can see
what you're grinding but I would like to have this light controlled by that switch is every time you
turn on the grinder then you got to turn on the light and then you turn the grinder off you turn
the light off so if I can get on to the wires from that switch I want to run the wires for
the light through that bottom switch okay got the grinder off the pedestal and then you have
the four rubber feet off and that holds this cover panel in place there's a screw here and I bet
there's the other screw underneath the capacitor there so let's see if we can take that out I've
got the thing unplugged let's see those screws are loose there so while we're in here the lamp
goes out this wire loom here here's your green ground a little bit complicated the switch was
throwing me for a while because it's got three terminals and if you follow here here's the
hot incoming black and then it goes over to the light and then there's two red wires so one red
wire goes to the bottom terminal of the switch and the other one goes into the motor and then
here's the neutral so you've got the white coming in white going to the light and then there's a
red going to the top of the switch so the center terminal must be the power to the motor I think
that's the key here because this switch there's a little isolation piece right there and your
hot wire is on the bottom I've got my continuity beeper on and then I'll flip the switch there's
the switched output and then there's the line or hot wire for the neon so I still want that on the
top but this one is the one that goes into the motor so I think what I'll do is I'll make up a
mail to go in there and then I'll clip the neutral that goes into the light cut that loose I'll put
two wires into a female that goes on here one of them will be this wire and then I'll add a little
pigtail to pick up this wire okay you tube get a little bit of work done on this last night what
I did was took the base off here both screws so then I cleaned up the paint with some acetone so
I ran a bead of adhesive around where the base contacts the motor and then put the two screws
in here with some red loctite and they look like they're m6 screws so if the Phillips head screws
don't hold I'll try to replace them I think hex head would be a lot better in here I just didn't
have any of those on hand or I would have used them so the idea with this adhesive I used some
shoe goo which is kind of a rubbery he civ and I'm thinking that'll help kind of stick these together
but also provide some vibration dampening so that if there is some vibration the adhesive
will hold the thing together so it doesn't start moving around but we'll see I figure I would try
something a little different and then let's go take a look at the wiring here anyway got the
motor capacitor back in there since it's okay got that screw tight oh I didn't tighten that
up all the way and then what I did was I cut the quite neutral wire off of the light here and I put
that into a female Spade lug and I'm gonna slide that on to the middle terminal of the switch here
see how that fits it looks like it's okay and then this is the wire that came off the middle
terminal and I put a male Spade lug there and this is where I cut the neutral that fed the light off
so this is the neutral coming in that feeds one end of the switch the hot is on the other end of
the switch for the neon indicator and then this is the switch to neutral which now goes to the
gooseneck light so now the light should turn on and off with the grinder and then the switch on
the light if I don't need a light I can turn it off yeah so basically I just took this neutral
connection here on the light and I moved it over here so it's on the switch side instead of the
unswept pretty simple change just one jumper wire there yeah let me get the bottom back on this will
get the cover and the base back on and then get it bolted back to the stand and then we can try it
out okay YouTube let's give it a test I've got the light switch turned on so if I turn on the grinder
see how the light fades out okay and there were coasting to a stop still have a little
work to do get to get this wheel Trude back up yeah this decides okay but it was this side the
loose screws cause us to vibrate and then the vibration caused the nut to loosen and then that
caused this wheel to wear a little crooked so I've got a bit of work to get that Trude up again but
yeah the light turns on and off when you turn the grinder on and off and you notice that how
the light dimmed slowly when I turned the power off because the the motor is still spinning and
generating a little bit of power I guess the back EMF was enough to keep the light bulb running for
a bit I guess I should have got in there and fixed a little earlier before this wheel loosened up so
this was a Sun X tools model five zero zero to a 8 inch diameter one inch wide wheel on both sides so
now I have a light that turns on and off with the grinder have one of these grinders with a
built-in gooseneck light pretty easy to rewire it to have the light turn on and off with the grinder
motor yeah if you have any questions about that post up in the comment section below and I'll put
some other power tool repair videos over here on the left side and as always thanks for watching