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Posted by David Littlewood on June 4, 2008, 6:07 pm
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I just foolishly tried to engage the clutch on my S7 with the spindle
locked. Medium loud bang, ring main c/b tripped. Switched off,
disengaged, reset c/b, tried again (properly this time). Another bang
and c/b tripped, and also this time the plug fuse blew.
Clearly behaving like a short circuit. Oh, I thought, perhaps the
starter capacitor has blown and gone short circuit. However, I tried to
turn over the motor with the clutch disengaged, it won't turn, appears
to be locked solid. That is puzzling, I think I may have wrecked the
motor (fairly standard 3/4 HP 1 phase induction motor). Anyone
experienced something similar, any quick fixes to suggest ("if you hit
it just *here* with a 12-oz hammer...." sort of thing)? Am I missing
something horribly simple?
Otherwise it could be a 3-phase/inverter job. Never mind, been looking
for an excuse to do that anyway. (I've just posted a question about this
in a separate thread to avoid confusion.)
David
--
David Littlewood
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Posted by Richard on June 5, 2008, 12:54 pm
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On Wed, 4 Jun 2008 23:07:48 +0100, David Littlewood
>I just foolishly tried to engage the clutch on my S7 with the spindle
>locked. Medium loud bang, ring main c/b tripped. Switched off,
>disengaged, reset c/b, tried again (properly this time). Another bang
>and c/b tripped, and also this time the plug fuse blew.
>
>Clearly behaving like a short circuit. Oh, I thought, perhaps the
>starter capacitor has blown and gone short circuit. However, I tried to
>turn over the motor with the clutch disengaged, it won't turn, appears
>to be locked solid. That is puzzling, I think I may have wrecked the
>motor (fairly standard 3/4 HP 1 phase induction motor). Anyone
>experienced something similar, any quick fixes to suggest ("if you hit
>it just *here* with a 12-oz hammer...." sort of thing)? Am I missing
>something horribly simple?
>
>Otherwise it could be a 3-phase/inverter job. Never mind, been looking
>for an excuse to do that anyway. (I've just posted a question about this
>in a separate thread to avoid confusion.)
>
>David
I think it's unlikely you would end up with a siezed motor even if it
were 'blown'. More likely there's a bit of broken clutch mechanism
jammed in the works somewhere. Certainly check the motor in isolation
( ie mechanically disconnected from the lathe drive) before you hand
over the coin of the realm for a new one.
Richard
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Posted by on June 6, 2008, 4:05 am
Please log in for more thread options > I just foolishly tried to engage the clutch on my S7 with the spindle
> locked. Medium loud bang, ring main c/b tripped. Switched off,
> disengaged, reset c/b, tried again (properly this time). Another bang
> and c/b tripped, and also this time the plug fuse blew.
>
> Clearly behaving like a short circuit. Oh, I thought, perhaps the
> starter capacitor has blown and gone short circuit. However, I tried to
> turn over the motor with the clutch disengaged, it won't turn, appears
> to be locked solid. That is puzzling, I think I may have wrecked the
> motor (fairly standard 3/4 HP 1 phase induction motor). Anyone
> experienced something similar, any quick fixes to suggest ("if you hit
> it just *here* with a 12-oz hammer...." sort of thing)? Am I missing
> something horribly simple?
>
> Otherwise it could be a 3-phase/inverter job. Never mind, been looking
> for an excuse to do that anyway. (I've just posted a question about this
> in a separate thread to avoid confusion.)
>
> David
> --
> David Littlewood
David, not an exact match for your problem but I have had problems
with my older single phase Myford. Switched on one morning and the
motor "exploded" (well that is how our media would have described it).
After much research to find the best "value for money" replacement
that problem turned out to be merely swarf that had dropped into the
motor connection block..
Is yours a "resilient mounted" one - if so then starting as you did
can cause the mount to rotate a fair distance and jam things up. As
always don't ask how I found that out :-)) I know that shouldn't
happen but on my older motor the front and rear mounts reacted
differently (front was good rear was soft) and twisted the motor. If
there was anything loose in the motor casing it would surely have
moved. Sorry, but if your luck is like mine lately, it will certainly
be "serious".
regards
Keith
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Posted by David Littlewood on June 6, 2008, 5:06 am
Please log in for more thread options In article
jontom_1uk@hotmail.com writes
>> I just foolishly tried to engage the clutch on my S7 with the spindle
>> locked. Medium loud bang, ring main c/b tripped. Switched off,
>> disengaged, reset c/b, tried again (properly this time). Another bang
>> and c/b tripped, and also this time the plug fuse blew.
>>
>> Clearly behaving like a short circuit. Oh, I thought, perhaps the
>> starter capacitor has blown and gone short circuit. However, I tried to
>> turn over the motor with the clutch disengaged, it won't turn, appears
>> to be locked solid. That is puzzling, I think I may have wrecked the
>> motor (fairly standard 3/4 HP 1 phase induction motor). Anyone
>> experienced something similar, any quick fixes to suggest ("if you hit
>> it just *here* with a 12-oz hammer...." sort of thing)? Am I missing
>> something horribly simple?
>>
>> Otherwise it could be a 3-phase/inverter job. Never mind, been looking
>> for an excuse to do that anyway. (I've just posted a question about this
>> in a separate thread to avoid confusion.)
>>
>> David
>> --
>> David Littlewood
>
>
>David, not an exact match for your problem but I have had problems
>with my older single phase Myford. Switched on one morning and the
>motor "exploded" (well that is how our media would have described it).
>After much research to find the best "value for money" replacement
>that problem turned out to be merely swarf that had dropped into the
>motor connection block..
>
>Is yours a "resilient mounted" one - if so then starting as you did
>can cause the mount to rotate a fair distance and jam things up. As
>always don't ask how I found that out :-)) I know that shouldn't
>happen but on my older motor the front and rear mounts reacted
>differently (front was good rear was soft) and twisted the motor. If
>there was anything loose in the motor casing it would surely have
>moved. Sorry, but if your luck is like mine lately, it will certainly
>be "serious".
>
Keith,
I'll go and check later. It's a puzzle, a combination of s/c and frozen
solid. As I say, looking on the bright side, a good excuse to convince
SWMBO that I have to buy an inverter!
David
--
David Littlewood
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Posted by Mark Rand on June 6, 2008, 2:52 pm
Please log in for more thread options wrote:
>
>I'll go and check later. It's a puzzle, a combination of s/c and frozen
>solid. As I say, looking on the bright side, a good excuse to convince
>SWMBO that I have to buy an inverter!
>
>David
Centrifugal switch no longer arranged as the designer intended???
Mark Rand
RTFM
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>locked. Medium loud bang, ring main c/b tripped. Switched off,
>disengaged, reset c/b, tried again (properly this time). Another bang
>and c/b tripped, and also this time the plug fuse blew.
>
>Clearly behaving like a short circuit. Oh, I thought, perhaps the
>starter capacitor has blown and gone short circuit. However, I tried to
>turn over the motor with the clutch disengaged, it won't turn, appears
>to be locked solid. That is puzzling, I think I may have wrecked the
>motor (fairly standard 3/4 HP 1 phase induction motor). Anyone
>experienced something similar, any quick fixes to suggest ("if you hit
>it just *here* with a 12-oz hammer...." sort of thing)? Am I missing
>something horribly simple?
>
>Otherwise it could be a 3-phase/inverter job. Never mind, been looking
>for an excuse to do that anyway. (I've just posted a question about this
>in a separate thread to avoid confusion.)
>
>David