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On 11/29/2014 1:11 PM, John Doe wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
The saw is designed to run at a certain RPM and blade size. Changing
either is not recommended.
I know I didn't answer your question. My response was in the name of safety.
John Doe <always.look@message.header> wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
If the rotor is AC/DC (most inexpensive power tools like drills,
circular saws, and miter saws) a diode is an excellent choice to just
drop some voltage and slow it down.
Since the thing can probably pull a few amps you want high current
diode; 20+ amps would be my guess and whatever line voltage you run
at.
AC/DC motors are easily distinguished because they make lots more
noise than induction motors. AND you are saying that you have 5500
RPM? That is too fast to be an induction motor on 50 or 60 cycles.
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From: Jasen Betts <jasen xnet.co.nz
Newsgroups: sci.electronics.basics
Subject: Re: How to slow down RPM of miter saw?
Date: 29 Nov 2014 21:18:19 GMT
Organization: JJ's own news server
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On 2014-11-29, John Doe <always.look message.header> wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
Unplug it! Do you see what lack of detail does to the quality of the
answers you can expect.
What about simply adding a diode in series on the power cord?
That will probably work, but this path (reducing supply voltage)
is a good way to burn out the motor. if you follow this path your
warranty is void.
Any advice, references, and links would be appreciated.
If this is an important tool, replace it with one designed to run at
the correct RPM.
--
umop apisdn
Yes it will reduce the "power" since power is RPM versus torque. You
will reduce the RPM to something less than half with less power (all
things being equal) but the motor will still behave like an AC/DC
motor and draw more current and produce more torque as the load tries
to slow it down
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From: Jasen Betts <jasen xnet.co.nz
Newsgroups: sci.electronics.basics
Subject: Re: How to slow down RPM of miter saw?
Date: 29 Nov 2014 21:31:05 GMT
Organization: JJ's own news server
Message-ID: <m5ddup$egh$1 gonzo.reversiblemaps.ath.cx
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On 2014-11-29, default <default defaulter.net> wrote:
On Sat, 29 Nov 2014 18:11:14 +0000 (UTC), John Doe
always.look message.header> wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
If the rotor is AC/DC (most inexpensive power tools like drills,
circular saws, and miter saws) a diode is an excellent choice to just
drop some voltage and slow it down.
Since the thing can probably pull a few amps you want high current
diode; 20+ amps would be my guess and whatever line voltage you run
at.
starting (stall) current could be 100A or more.
AC/DC motors are easily distinguished because they make lots more
noise than induction motors. AND you are saying that you have 5500
RPM? That is too fast to be an induction motor on 50 or 60 cycles.
Pretty-much all types of circular saws have some sort of gearchain or
belt drive between the motor and the blade, the blade rarely runs at
the same speed as the motor. One reason for this is to offset the bulk
of the motor from the plane of the blade axle, allowing deeper cuts
with a given size of blade. So, blade speed is not indicative of motor
speed.
--
umop apisdn
always.look@message.header says...
What about simply adding a diode in series on the power cord?
Only if it's a universal motor, and you want to do it at the motor
lead connections, in case you have something else in the saw that
expects AC.
The saw is designed to run at a certain RPM and blade size. ChangingThe motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
Yes it will reduce the "power" since power is RPM versus torque. Youdefault <default@defaulter.net> wrote:
John Doe <always.look@message.header> wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
If the rotor is AC/DC (most inexpensive power tools like drills,
circular saws, and miter saws) a diode is an excellent choice to just
drop some voltage and slow it down.
Since the thing can probably pull a few amps you want high current
diode; 20+ amps would be my guess and whatever line voltage you run
at.
AC/DC motors are easily distinguished because they make lots more
noise than induction motors. AND you are saying that you have 5500
RPM? That is too fast to be an induction motor on 50 or 60 cycles.
Yes, I'm sure it's an AC/DC motor. It's a cheap miter saw. So if it's an
AC/DC motor, using a diode drops the voltage which in turn reduces the
RPM? Using a diode won't just reduce the power?
It's obviously the easiest possible attempt, that and providing a simple
(properly rated) switch to change between the two power levels.
On Sat, 29 Nov 2014 18:11:14 +0000 (UTC), John Doe
always.look@message.header> wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
If the rotor is AC/DC (most inexpensive power tools like drills,
circular saws, and miter saws) a diode is an excellent choice to just
drop some voltage and slow it down.
Since the thing can probably pull a few amps you want high current
diode; 20+ amps would be my guess and whatever line voltage you run
at.
AC/DC motors are easily distinguished because they make lots more
noise than induction motors. AND you are saying that you have 5500
RPM? That is too fast to be an induction motor on 50 or 60 cycles.
I won't even begin to address such a nasty rant against someone who onlyHave you ever even used a miter saw?
More often the design of a common inexpensive tool takes into
consideration the cheapness of its parts. A more expensive tool might
run at a faster or slower RPM and be designed to do the same thing, only
better. Safety doesn't necessarily have anything to do with lowering the
RPM. If you want to go on a crusade for miter saw safety, you should
talk about wearing eye protection and keeping your hands away from the
cut. In fact, I am using it for aluminum. Obviously that's not what it's
designed for but that happens to be what many of us, including
professional metalworkers, use miter saws for.
Miter saws are not for people who are overly concerned about safety.
They are inherently hazardous. It also isn't for people who have no
basis for their understanding of safety. I've come across people who
don't really know what they're talking about that say you should use
gloves "in the name of safety", but that actually increases the risk.
I'm trying to solve a problem that has to do with a potential hazard.
And it requires a lower RPM.
I think there is a safety consideration with lowering the RPM, but the
reply author probably doesn't even know what that might be. If the idea
were to increase the RPM, then there would be an obvious possible
concern for safety that any Joe might recognize.
I just bought a cheap abrasive cutoff disc made by a well-known
manufacturer that's supposed to cut metal. The thing doesn't cut
aluminum and therefore trying to do so is a safety hazard.
Using a miter saw is not for the meek.
Tom Biasi <tombiasi@optonline.net> wrote in news:Lxoew.792810$1s.710374@fx05.iad:
On 11/29/2014 1:11 PM, John Doe wrote:
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
The saw is designed to run at a certain RPM and blade size. Changing
either is not recommended.
I know I didn't answer your question. My response was in the name of safety.
The motor runs on standard USA 120 V 60 Hz, 14 A, at 5500 RPM.
What's the easiest way to slow down the RPM?
What about simply adding a diode in series on the power cord?
Any advice, references, and links would be appreciated.
Thanks.
I don't know about New Zealand, but in United States English the
expression "slow down" does not mean "stop". And in fact I am not asking
for a specific RPM, therefore that specification is not needed, as the
helpful replies already indicate.
As for "voiding the warranty". I can void a warranty before even touching
a product...