I have a particular tool and cutter grinder. Its head is noisy, in
fact, its noise resembles the sound of a rotary siren (though not as
loud). Would you say that the most likely cause of it is bad bearings?
If the motor is tied directly to the spindle..remove the motor and
run. If you still hear the squealing..check the sheetmetal around the
fan and see if it got dented. If it still squeals...hold a long screw
driver to the bearing areas on each end and put the screw driver
handle in your ear for a stethescope.
If it comes from the spindle...pull the bearings AND MAKE A DRAWING of
it being disassembled (or take photos as you remove each part) and
order and install new bearings
Gunner Asch fired this volley in
Um... why not just use the _almost_new_ Snap-On Mechanic's Stethoscope he
bought for $2.00?
Seriously... It must've been over 40 years ago that I learned the value
of having an _actual_ professional stethoscope with interchangable probe
tips in the kit.
Especially for machines with big tin bodies around them, they're
invaluable for finding where the real noise is coming from.
Further, unless you stick it into a running fan, or light it on fire, a
good stethoscope is a one-time purchase.
There are inexpensive electronic versions with contact microphones, too.
I dunno if they'd last forever like mechanical ones do, but if you keep
the batteries stored separate from the tool, one should last many
Jon, one cannot be led on a wild goose chase unless one is _willing_ to
Ig may not ask the questions you approve of, but he also isn't demanding
that you, personally, spend your time to answer them. You _could_ just
ignore them... no?
You put more energy into complaining about them than many legitimate
answerers put into their answers!
That last question was one of those "well... DUH!" ones to me, too. But
at least when someone gives Ig an answer, he considers it, might use it,
tries to understand it. (FWIW, he GIVES answers to folks, too... about
higher math. No... polar trigonometry is not higher math. I mean
Ig's not like that dope who keeps coming back around asking things like
how to wire a welding circuit using steel wool for wiring, or why, just
because a drill bit is right-handed, couldn't he go ahead and use it in a
left-hand direction anyway!
So... Jon (seriously), if you don't like his questions, why burn so many
calories on telling him and us why you won't answer them? Just ignore
Is it possible to detach the two, scrape the
firemen out of the grease cup, and run the
motor alone? Put the firemen and the cutting
head back one at a time.
Is the tool big enough for zerks, or is it
perma lube? Some spray oil here or there, may
give you a quick diagnosis.
As an old man who grew up in the shadow of The Great
Depression, I'd use solvent of some kind, and clean
out the old bearings. Regrease them, and see if that
helped. I do think the drawings and photos are
Stormin Mormon fired this volley in
Stormy, grease (ner oil) never helps a screaming bearing. It might help
deaden the noise for a few minutes, but doesn't aid in the underlying
cause, at all.
Stormin Mormon fired this volley in
Ok... Stormy, usually you 'get it' even if you don't have any experience
Let me ask YOU. If you had some precision bearings, and they were
galled, pitted, corroded, or just stuck... and you confirmed that
lubrication would not fix the problem... What would you do next?
Would you pump them full of valve grinding compound, and let them run a
I bought a stethescope a few years ago for just this need..and found
out it works very well...but a screw driver works Almost as well and
doesnt need any special care in my tool box.
True indeed. However...if it was surplus machinery..it probably had a
hard life..and more than likely cleaning and greasing old bearings
will increase the lifespan a small amount..but not really "fix" the
propblem. Shrug...When I fix a clients machine...I avoid putting
bandaids on them..I fix them properly so it has a much much longer
For a hobby shop..your method will probably be viable.
Jon boi is a mentally ill disturbed whining bitch who is living his
miserable life in Section 8 housing and trying to grab onto the "good
old days"...though even in the Shining Times...he was a worthless
There are bearings..and then there are high precision bearings.
Motor beariings may or may not be medium precison bearings
Spindle bearings ARE high precison bearings
Yes..Iggy could probably stuff oatmeal in the bearings of either one
and make it quiet enough to sell. And when the new owner gets it back
to his shop and it starts to squeal within an hour..they are going to
pull it down, check the bearings..descover the "oatmeal" used to
camoflage the squeal..and be less than comfortable buying the next
item Iggy has for sale.
Bearings of this nature are cheap enough. Motor bearings can be had
for $5 for the pair if you want to run Chinese bearings (I
dont..but..they work well enough for motors) However..spindle
bearings are High Precision bearings..and they might cost him $50 for
the pair. And when he sells it..he tells them he put brand new
NSK/SKS etc etc bearings in the spindle and they are very happy with
him and they buy other machinery from him with full confidence at his
You dont work in the manufacturing/machinery repair industry...so you
really dont have a clue how the thinking works.
People who buy used machinery..know full well that they are not buying
a brand new machine...but they expect it to do what they are buying it
For..and unless they are told up front that bearings are bad...they
expect them to be "adequate". Bearings can be a pain in the ass to
replace in metalworking machinery. Seriously....
This (below) was a simple bearing repair..that required a forklift
just to remove the assembly..and the bearings themselves were $600 (5
the photos above were just a sampling of the 50 (of each projec)t or
more I took while I was disassembling the turret..so I would know how
to put each back together again. As you will notice..the crack in the
casting was the issue with the turret..but because of the expense of
repairing the crack ($1800 for labor)...putting in new bearings was
indicated and the client agreed) Now they dont ever have to worry
about spending another $1800 just to remove the bastard again when a
bearing goes out..and it would have)
Its not...always like swapping out wheel bearings on your Chevy