Circular Saw failure

[Sylvia Else]

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

 

[Aussie]

On 25-May-17 6:11 PM, Sylvia Else wrote:

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Antifungal cream fixed my circular sore but I doubt it will do much for
that commutator.

 

[Phil Allison]

Aussie wrote:

---------------

Sylvia Else wrote:

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.


Antifungal cream fixed my circular sore but I doubt it will do much for
that commutator.

** ROTFLMAO ...




..... Phil

 

[FMurtz]

Sylvia Else wrote:

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in this
day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

 

[Xeno]

On 25/05/2017 10:35 PM, FMurtz wrote:

Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in this
day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


--

Xeno

 

[FMurtz]

Xeno wrote:

On 25/05/2017 10:35 PM, FMurtz wrote:
Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in
this day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


Not an armature winder but have done so.

 

[Clocky]

On 25/05/2017 10:37 PM, FMurtz wrote:

Xeno wrote:
On 25/05/2017 10:35 PM, FMurtz wrote:
Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in
this day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


Not an armature winder but have done so.

More of an amateur winder then?

 

[Clocky]

On 25/05/2017 6:11 PM, Sylvia Else wrote:

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Yup, she's cactus.

 

[Trevor Wilson]

On 25/05/2017 8:11 PM, Sylvia Else wrote:

I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

**Not as bad as my old Makita, but pretty bad. No problems with my
Hitachi or Festool circular saws. Yet. My next one will be a battery
powered brushless motor type. Hopefully, more reliable.

Buy a Festool. They are a delight. Expensive though. Let's not get
started on the extremely dodgy deal Festool did with the ACCC. They paid
the ACCC $275,000.00 so they could engage in retail price maintenance. I
sent the ACCC a request that they investigate themselves for that dodgy
deal. They refused to do so. I imported my Festool TS55R direct from
Germany. It cost me $550.00. Aussie retail is about $1,000.00.

--
Trevor Wilson
www.rageaudio.com.au

 

[Rheilly Phoull]

On 5/25/17 8:35 PM, FMurtz wrote:

Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in this
day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Ahhh the old mica insulation. Things have changed all right.

 

[Aussie]

On 25-May-17 11:27 PM, Clocky wrote:

On 25/05/2017 10:37 PM, FMurtz wrote:
Xeno wrote:
On 25/05/2017 10:35 PM, FMurtz wrote:
Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was
repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in
this day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


Not an armature winder but have done so.


More of an amateur winder then?

Very good!

 

[Sylvia Else]

On 26/05/2017 7:04 AM, Trevor Wilson wrote:

On 25/05/2017 8:11 PM, Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.


**Not as bad as my old Makita, but pretty bad. No problems with my
Hitachi or Festool circular saws. Yet. My next one will be a battery
powered brushless motor type. Hopefully, more reliable.

I find battery powered tools a right pain, because the batteries never
have that much capacity to begin with, and the capacity drops quite
quickly with age.

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

Sylvia.

 

[Xeno]

On 26/05/2017 12:37 AM, FMurtz wrote:

Xeno wrote:
On 25/05/2017 10:35 PM, FMurtz wrote:
Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in
this day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


Not an armature winder but have done so.

It was the only reason you would be tinkering with commutators I would
have thought. My electrical mate at the railways in Melbourne started in
the trade of armature winder (motor winder?) but gravitated to the
electrical fitting side of things. That's how he ended up working on the
metro trains in Vic. I suppose an electrical fitter would be tinkering
with commutators a lot too.


--

Xeno

 

[~misfit~]

Once upon a time on usenet Sylvia Else wrote:

On 26/05/2017 7:04 AM, Trevor Wilson wrote:
On 25/05/2017 8:11 PM, Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was
repairable. Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.


**Not as bad as my old Makita, but pretty bad. No problems with my
Hitachi or Festool circular saws. Yet. My next one will be a battery
powered brushless motor type. Hopefully, more reliable.

I find battery powered tools a right pain, because the batteries never
have that much capacity to begin with, and the capacity drops quite
quickly with age.

Things have changed recently with Li-Ion batteries and serious competition
in the marketplace.

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

Again unless you're familiar with 2016 - 2017 cordless tools I think you'll
be pleasantly surprised.

That said to buy a cordless circular saw (for instance) that is as powerful
as a corded saw and will run for more than 10 minutes you'll fork out quite
a lot of money. Probably 5 - 10 x what you could get a reasonable corded
model for.
--
Shaun.

"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)

 

[Clocky]

On 26/05/2017 9:52 AM, Sylvia Else wrote:

On 26/05/2017 7:04 AM, Trevor Wilson wrote:
On 25/05/2017 8:11 PM, Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.


**Not as bad as my old Makita, but pretty bad. No problems with my
Hitachi or Festool circular saws. Yet. My next one will be a battery
powered brushless motor type. Hopefully, more reliable.

I find battery powered tools a right pain, because the batteries never
have that much capacity to begin with, and the capacity drops quite
quickly with age.

I use cordless Makita power tools and the 5ah Lithium-Ion battery will
last all day. The also charge very quickly.

Some of my 4 year old 3ah batteries only last two or three hours now,
but that is with frequent use. They would still be fine for the home
handyman.

Having said that, I don't think a circular saw is really suited to
battery operation.

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

They usually quote voltage and a/h capacity.

 

[Peter]

On 26/05/2017 3:47 PM, Xeno wrote:

On 26/05/2017 12:37 AM, FMurtz wrote:
Xeno wrote:
On 25/05/2017 10:35 PM, FMurtz wrote:
Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was
repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.

Back in the day we used to repair or replace commutators but not in
this day and age especially ones with this method of construction.

I made this one with a lathe and files over 50 years ago as part of a
course, bit tarnished wit age.
http://imgur.com/a/SHLw1

Are you an armature winder by trade Fred? Maybe an electrical fitter?


Not an armature winder but have done so.

It was the only reason you would be tinkering with commutators I would
have thought. My electrical mate at the railways in Melbourne started in
the trade of armature winder (motor winder?) but gravitated to the
electrical fitting side of things. That's how he ended up working on the
metro trains in Vic. I suppose an electrical fitter would be tinkering
with commutators a lot too.

Especially on the metro trains. Thousands of commutatators using the
rail network every morning and evening.

 

[Sylvia Else]

On 26/05/2017 6:21 PM, Clocky wrote:

On 26/05/2017 9:52 AM, Sylvia Else wrote:

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

They usually quote voltage and a/h capacity.

Yes, but that still doesn't tell the interesting datum - the power input
to the tool, which correlates with its performance.

Sylvia.

 

[Trevor Wilson]

On 26/05/2017 11:52 AM, Sylvia Else wrote:

On 26/05/2017 7:04 AM, Trevor Wilson wrote:
On 25/05/2017 8:11 PM, Sylvia Else wrote:
I pulled my failed circular saw apart to see whether it was repairable.

Seems a rather dramatic failure of the commutator.

https://www.dropbox.com/s/gzp9tqd14nd9ot8/20170525_200615.jpg?dl=0

So, no

Sylvia.


**Not as bad as my old Makita, but pretty bad. No problems with my
Hitachi or Festool circular saws. Yet. My next one will be a battery
powered brushless motor type. Hopefully, more reliable.

I find battery powered tools a right pain, because the batteries never
have that much capacity to begin with, and the capacity drops quite
quickly with age.

**In 1972 perhaps. Not so much today. A 5 or 6 Amp Li-Ion battery will
run a power tool for quite some time. Most kits come with two batteries
now. A mate is a builder and the only tool he takes to sites that is
still 240VAC is his drop saw. And the battery charger for all the other
tools. For builders, it's brilliant. They only need to tag and test one
tool - the charger.

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

**Tut-tut. I expected more from you that this. For battery screwdrivers,
almost all provide RPM and torque figures, which is all you need to
know. In a real sense, a modern brushless motor drill, delivers more
power than a 600 Watt 240VAC drill. Only when you start dealing with
1,500 Watt motors and more, do you need to worry about 240VAC tools.



--
Trevor Wilson
www.rageaudio.com.au

 

[Sylvia Else]

On 26/05/2017 8:05 PM, Trevor Wilson wrote:

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what you're
getting.

**Tut-tut. I expected more from you that this. For battery screwdrivers,
almost all provide RPM and torque figures, which is all you need to
know. In a real sense, a modern brushless motor drill, delivers more
power than a 600 Watt 240VAC drill.

Perhaps it does. The drill may thus be consuming more than 600 watts
from its battery, which would be nice to know.

Sylvia.

 

[~misfit~]

Once upon a time on usenet Sylvia Else wrote:

On 26/05/2017 8:05 PM, Trevor Wilson wrote:

Also, the manufacturers always quote the voltage, which is next to
meaningless, but never the power, so you really don't know what
you're getting.

**Tut-tut. I expected more from you that this. For battery
screwdrivers, almost all provide RPM and torque figures, which is
all you need to know. In a real sense, a modern brushless motor
drill, delivers more power than a 600 Watt 240VAC drill.

Perhaps it does. The drill may thus be consuming more than 600 watts
from its battery, which would be nice to know.

Or it could be that brushless DC motors are far more efficient than brushed
AC universal motors. Heck they (can) even do regenerative braking when you
let go of the power button!
--
Shaun.

"Humans will have advanced a long, long way when religious belief has a cozy
little classification in the DSM*."
David Melville (in r.a.s.f1)
(*Diagnostic and Statistical Manual of Mental Disorders)