Â* No , not because I hung it too low . The old (freebie) fan in our
living room decided to start squeaking , so I ordered a replacement -
and 2 more for other rooms since we wanted the same unit throughout the
house and these were a good buy . Nice factory refurb Hunter 52" 5
blades , 4 speed though the sales literature says 3 . The first 2 went
on the short downrods included , but the 3rd needed a longer rod since
the ceiling is vaulted . And it's the only one that didn't run perfectly
balanced out of the box . So here's the thing - it runs rock steady at
all but one speed (2nd slowest) where it has a very slight maybe 1/4" or
less wobble . I did check blade alignment before balancing , all within
1/16" . It's not enough wobble to be annoying , you don't even notice it
unless you're looking for it . I'm just puzzled why it only occurs at
the one speed .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !

On Tuesday, January 29, 2019 at 8:04:14 AM UTC-5, Terry Coombs wrote:
Â* No , not because I hung it too low . The old (freebie) fan in our
living room decided to start squeaking , so I ordered a replacement -
and 2 more for other rooms since we wanted the same unit throughout the
house and these were a good buy . Nice factory refurb Hunter 52" 5
blades , 4 speed though the sales literature says 3 . The first 2 went
on the short downrods included , but the 3rd needed a longer rod since
the ceiling is vaulted . And it's the only one that didn't run perfectly
balanced out of the box . So here's the thing - it runs rock steady at
all but one speed (2nd slowest) where it has a very slight maybe 1/4" or
less wobble . I did check blade alignment before balancing , all within
1/16" . It's not enough wobble to be annoying , you don't even notice it
unless you're looking for it . I'm just puzzled why it only occurs at
the one speed .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !

For the same reason out of balance tires typically only show up at certain
speeds. They have certain speeds where the characteristics of the system
allow it to resonate. Kind of like a tuning fork will resonate at a
certain frequency. You can fix it by placing small weights, like maybe
one or more dimes, on one of the blades by trial and error. There should be
instructions for doing that for that fan or if not, follow instructions
for a similar fan.

In article ,
says...

For the same reason out of balance tires typically only show up at certain
speeds. They have certain speeds where the characteristics of the system
allow it to resonate. Kind of like a tuning fork will resonate at a
certain frequency. You can fix it by placing small weights, like maybe
one or more dimes, on one of the blades by trial and error. There should be
instructions for doing that for that fan or if not, follow instructions
for a similar fan.



I agree that it is somewhat out of ballance. I had a car that a front
tire became out of ballance. At any speed except from about 55 to 60
mph it was fine as soon as I got in that speed range the stering wheel
would shake so bad I could hardly hold it.

It could also be one of the blades is not in alignment with the others.

On 1/29/2019 9:08 AM, Ralph Mowery wrote:
In article ,
says...
For the same reason out of balance tires typically only show up at certain
speeds. They have certain speeds where the characteristics of the system
allow it to resonate. Kind of like a tuning fork will resonate at a
certain frequency. You can fix it by placing small weights, like maybe
one or more dimes, on one of the blades by trial and error. There should be
instructions for doing that for that fan or if not, follow instructions
for a similar fan.


I agree that it is somewhat out of ballance. I had a car that a front
tire became out of ballance. At any speed except from about 55 to 60
mph it was fine as soon as I got in that speed range the stering wheel
would shake so bad I could hardly hold it.

It could also be one of the blades is not in alignment with the others.


Â* Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !

On 1/29/2019 9:16 AM, Terry Coombs wrote:
Â*

Â* Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .


We have a ceiling fan that does the same thing. I'm curious what the
answer to your question is, too.

--
Maggie

"Muggles" wrote in message
...
On 1/29/2019 9:16 AM, Terry Coombs wrote:


Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .


We have a ceiling fan that does the same thing. I'm curious what the
answer to your question is, too.

Its due to the rotation frequency of the fan at that speed setting
being close to the resonance frequency of the long rod.

In article , says...


* Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .




Go here for some good info on the fans.

One other thing that is mentioned is the fan rocking back and forth, or
wobbling ? The link explains it.

http://www.casablancafanrepair.com/H...nuals/Chapter1
4/SM_WobblingFan_P1.htm

so with the fan off, give it a sideways push to get it rocking.

See the speed it rocks by itself. That is the resonance speed.

Like a pendulum it takes only a ___tiny___ push to keep it rocking if the push comes at the same speed as the resonance.

So you probably have a slight imbalance that is not an issue expect that the resonance happens to be close to that next to slowest fan speed.

You other option is to change the resonance by making the hanging pipe a little longer or shorter.

m

On 1/29/2019 11:58 AM, Ralph Mowery wrote:
In article , says...

* Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .



Go here for some good info on the fans.

One other thing that is mentioned is the fan rocking back and forth, or
wobbling ? The link explains it.

http://www.casablancafanrepair.com/H...nuals/Chapter1
4/SM_WobblingFan_P1.htm


* If you watch closely you can see it moving in a small circle . As I
said , it's not noticeable unless you're looking for it .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !

On Tue, 29 Jan 2019 12:58:33 -0500, Ralph Mowery
wrote:

http://www.casablancafanrepair.com/H...nuals/Chapter1
4/SM_WobblingFan_P1.htm
Dynamic balance is a funny thing. Weight distribution comes i nto
play. If all the blades are exactly the same weight, you are not
NECESSARILY in ballance. The weight distribution also comes into play.
If one blade is tip heavy it will balance statically, but not
dynamically (at speed). Dynamic unbalance can change from speed to
speed depending on weight distribution. At a given speed the blade may
be unballanced dynamically enough to excite it's resonance - while at
a higher speed it may be damped enough to not be noticed, and at a
lower speed the rotational inbalance may not be enough to excite it.

You also noted these were reconditioned fans.
The blades are MATCHED from the factory, and if in the reconditioning
process one or more blades from a different "set" were mixed in you
could well have a "missmatch".

Another thing - you checked tracking, and you static balanced - but
did you check the angle of incidence of each blade? If one has a
slightly different pitch it WILL shake - and possibly onl;y at ons
speed setting due to resonance. I've adjusted incidence on fans by
inseting paper shims or washers under one screw, between the blade and
the mounting bracket, or between the bracket and the fan
motor/housing.

On Tuesday, January 29, 2019 at 10:15:35 AM UTC-5, Terry Coombs wrote:
On 1/29/2019 9:08 AM, Ralph Mowery wrote:
In article ,
says...
For the same reason out of balance tires typically only show up at certain
speeds. They have certain speeds where the characteristics of the system
allow it to resonate. Kind of like a tuning fork will resonate at a
certain frequency. You can fix it by placing small weights, like maybe
one or more dimes, on one of the blades by trial and error. There should be
instructions for doing that for that fan or if not, follow instructions
for a similar fan.


I agree that it is somewhat out of ballance. I had a car that a front
tire became out of ballance. At any speed except from about 55 to 60
mph it was fine as soon as I got in that speed range the stering wheel
would shake so bad I could hardly hold it.

It could also be one of the blades is not in alignment with the others.


Â* Y'all need to re-read my post , the blades were checked for alignment
by measuring from a point on the ceiling , all were within 1/16" of the
same - 35 1/16 to 35 1/8 . The fan was then balanced with the included
kit according to the instructions at the highest speed setting . At
EVERY speed but the nest to slowest this fan is rock steady , not a
quiver . If the fan blades were not balanced or the blades were not in
the same plane it should wobble at ALL speeds , not just one . As I said
, unless you look for it the wobble is so slight that you'd never notice
it .

--
Snag
Yes , I'm old
and crochety - and armed .
Get outta my woods !


Balance it again at the speed that's a problem. Also, I think you said it
was a refurb, maybe you found out why it was returned. But I would think
balancing it at the problem speed could work.

"Terry Coombs" wrote in message
...
No , not because I hung it too low . The old (freebie) fan in our living
room decided to start squeaking , so I ordered a replacement - and 2 more
for other rooms since we wanted the same unit throughout the house and
these were a good buy . Nice factory refurb Hunter 52" 5 blades , 4 speed
though the sales literature says 3 . The first 2 went on the short
downrods included , but the 3rd needed a longer rod since the ceiling is
vaulted . And it's the only one that didn't run perfectly balanced out of
the box . So here's the thing - it runs rock steady at all but one speed
(2nd slowest) where it has a very slight maybe 1/4" or less wobble . I did
check blade alignment before balancing , all within 1/16" . It's not
enough wobble to be annoying , you don't even notice it unless you're
looking for it . I'm just puzzled why it only occurs at the one speed .

Because thats the frequency that the long rod resonates at.