On Thursday, June 02, 2011 02:01:42 AM Jon Elson did opine:
gene heskett wrote:
Well, I did the deed, and I have verified that when the switch is off,
there is a dead short across the receptacle the motor is plugged into.
About 20 tests with the saw motor plugged into it, no effect.
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts to
the old blade guard bracket, under the table insert. You must make a zero
clearance table insert, I make mine from the 1/2 thick melamine coated
phenolic from Highland Hardware
On 6/2/2011 2:05 AM, gene heskett wrote:
On Thursday, June 02, 2011 02:01:42 AM Jon Elson did opine:
gene heskett wrote:
Well, I did the deed, and I have verified that when the switch is off,
there is a dead short across the receptacle the motor is plugged into.
About 20 tests
Hello Gene,
seems that we have different descriptive names for things, especially
motors, in the US and Germany (which is .de-country, Deutschland). We
have 230 V AC, 50 Hz here (single phase speaking, it's part of a 400
volts three-phase system). Nowadays, as everybody puts photovoltaic
On 06/01/2011 11:20 PM, Dave wrote:
Yes, I know what you are talking about but those kickback preventers
have a way of getting in the way sometimes also.
I am much more careful than I used to be. The kickback I experienced
was mostly operator induced. I was asking for problems. No
On 06/01/2011 11:56 PM, gene heskett wrote:
I am much more careful than I used to be. The kickback I experienced
was mostly operator induced. I was asking for problems. No problems
since then.
Much as I hate to admit it, his was classic PEBKAC too. :(
Gene,
Haven't heard that
On 2 June 2011 04:56, gene heskett ghesk...@wdtv.com wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts to
the old blade guard bracket, under the table insert.
I think you are describing a riving knife?
On Thursday, June 02, 2011 09:17:34 AM Dave did opine:
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts
to the old blade guard bracket, under the table insert. You must
make a zero clearance table insert, I make mine from the
On Thursday, June 02, 2011 09:37:05 AM Peter Blodow did opine:
Hello Gene,
seems that we have different descriptive names for things, especially
motors, in the US and Germany (which is .de-country, Deutschland). We
have 230 V AC, 50 Hz here (single phase speaking, it's part of a 400
volts
On Thursday, June 02, 2011 10:19:03 AM Mark Wendt did opine:
On 06/01/2011 11:20 PM, Dave wrote:
Yes, I know what you are talking about but those kickback preventers
have a way of getting in the way sometimes also.
I am much more careful than I used to be. The kickback I experienced
Dave wrote:
OK... so then how does my 80's Delta chopsaw stop the motor with the
pushbutton on the handle? It has a universal brush motor also, no soft
start or variable speed...
They may specifically use a field iron that has a much higher remanent
flux than would usually
be used.
On 06/02/2011 10:24 AM, gene heskett wrote:
On Thursday, June 02, 2011 10:19:03 AM Mark Wendt did opine:
On 06/01/2011 11:20 PM, Dave wrote:
Yes, I know what you are talking about but those kickback preventers
have a way of getting in the way sometimes also.
I am much more careful than I
On Thursday, June 02, 2011 10:29:08 AM andy pugh did opine:
On 2 June 2011 04:56, gene heskett ghesk...@wdtv.com wrote:
This is NOT a kickback pawl. �This is a solid steel plate that mounts
to the old blade guard bracket, under the table insert.
I think you are describing a riving knife?
On Thu, 2011-06-02 at 09:28 -0400, gene heskett wrote:
On Thursday, June 02, 2011 09:17:34 AM Dave did opine:
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts
to the old blade guard bracket, under the table insert. You must
On Thursday, June 02, 2011 11:36:58 AM dave did opine:
On Thu, 2011-06-02 at 09:28 -0400, gene heskett wrote:
On Thursday, June 02, 2011 09:17:34 AM Dave did opine:
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that
mounts to the
: [Emc-users] Suicide brakes on an AC universal motor?
On Thu, 2011-06-02 at 09:28 -0400, gene heskett wrote:
On Thursday, June 02, 2011 09:17:34 AM Dave did opine:
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts
to the old
On 6/2/2011 9:28 AM, gene heskett wrote:
They still seem very adverse to
just plain using enough quality steel, but 2 pounds of fawncy plastic that
is always in the way seems to be their answer.
That is the truth...
Lawyers and common sense seem to be diametrically opposed
On 06/02/2011 11:11 AM, dave wrote:
On Thu, 2011-06-02 at 09:28 -0400, gene heskett wrote:
On Thursday, June 02, 2011 09:17:34 AM Dave did opine:
On 6/1/2011 11:56 PM, gene heskett wrote:
This is NOT a kickback pawl. This is a solid steel plate that mounts
to the old blade guard bracket,
, but
there is no way in hell I'd call those riving knives. Way to cheap and
flexible.
-Original Message-
From: dave
Sent: Thursday, June 02, 2011 11:11 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Suicide brakes on an AC universal motor?
On Thu, 2011-06-02
Greetings all;
Is anyone aware of a quick dirty retrofit kit to brake an AC universal
motor when the power is removed?
I have a Ryobi BT-3000 table saw, which when kept properly adjusted, does a
fine job. Its motor package is a universal motor that drives the blade
with a gilmer belt.
I
Gene,
You were very lucky.
Read this link down the page a bit...
http://woodworking.com/forum/showthread.php?18869-Miter-Saw-Brake
I think after you remove power, if you short out the motor, , the motor
will come to a stop. You might want to short it out through a resistor
to avoid having
I got one of those big old paddle switches:
http://1.bp.blogspot.com/_FFglI1QNcfg/S9Ih9zOBQxI/Ac8/cNo6rBODOkw/s1600/Safety+Stop+Switch+%28Grizzly+H8243%29.PNG
and mounted it exactly where my left knee is. The only downside is it's not
a magnetic switch, so I left the original magnetic
If you can't discipline yourself to watch it stop, it seems evident
that should figure out how to mount an overhead guard. The BT3000 was
a really nice saw, but mine developed a sticky off switch after a
couple of years.
Eric
On Wed, Jun 1, 2011 at 8:13 AM, gene heskett ghesk...@wdtv.com wrote:
Seems to me the best way to cut off some fingers is to depend on a
switch to stop the blade. At some point it will fail and you from habit
will stick yore fingers near. Just keep your hands in your pockets
until the blade stops. Just like any other safe working habits depend on
good
gene heskett wrote:
Greetings all;
Is anyone aware of a quick dirty retrofit kit to brake an AC universal
motor when the power is removed?
Oh, if you want quick and dirty, I already answered that. If you want a
faster stop, then a
relay that would apply something like 12 VAC from a
Gene, I suppose that your AC universal motor is an induction motor
with a field winding and a cage rotor. (If it were a motor with rotor
windings and a brush armature, it would be a AC-DC-universal motor and
the following recipe would not apply). When the power supply is cut off,
there is no
: Re: [Emc-users] Suicide brakes on an AC universal motor?
Gene, I suppose that your AC universal motor is an induction motor
with a field winding and a cage rotor. (If it were a motor with rotor
windings and a brush armature, it would be a AC-DC-universal motor and
the following recipe would
On Wednesday, June 01, 2011 07:08:02 PM Dave did opine:
Gene,
You were very lucky.
That's the way I read it. ;)
Read this link down the page a bit...
http://woodworking.com/forum/showthread.php?18869-Miter-Saw-Brake
I think after you remove power, if you short out the motor, , the
On Wednesday, June 01, 2011 07:36:24 PM doug metzler did opine:
I got one of those big old paddle switches:
http://1.bp.blogspot.com/_FFglI1QNcfg/S9Ih9zOBQxI/Ac8/cNo6rBODOk
w/s1600/Safety+Stop+Switch+%28Grizzly+H8243%29.PNG
Precisely what I am going to build, but rather than pay
On Wednesday, June 01, 2011 07:43:11 PM Eric Keller did opine:
If you can't discipline yourself to watch it stop, it seems evident
that should figure out how to mount an overhead guard. The BT3000 was
a really nice saw, but mine developed a sticky off switch after a
couple of years.
Eric
On Wednesday, June 01, 2011 11:03:20 PM Jon Elson did opine:
gene heskett wrote:
Greetings all;
Is anyone aware of a quick dirty retrofit kit to brake an AC
universal motor when the power is removed?
Oh, if you want quick and dirty, I already answered that. If you want a
faster
I have a Delta Chop saw that has a button on the handle. After I am
done cutting I can just press the button and the saw comes to a complete
and sudden stop.
My 12 Dewalt doesn't have a separate button, releasing the trigger does
it.
Nice, the Delta chop saw I have is one of
On Wednesday, June 01, 2011 11:14:32 PM Peter Blodow did opine:
Gene, I suppose that your AC universal motor is an induction motor
with a field winding and a cage rotor.
Nope.
(If it were a motor with rotor
windings and a brush armature, it would be a AC-DC-universal motor
It is, complete
On Wednesday, June 01, 2011 11:40:41 PM Dave did opine:
I have a Delta Chop saw that has a button on the handle. After I am
done cutting I can just press the button and the saw comes to a
complete and sudden stop.
My 12 Dewalt doesn't have a separate button, releasing the trigger
On 06/01/2011 07:36 PM, emc-users-requ...@lists.sourceforge.net wrote:
The resistor I did use when I was building the interface for my mills
spindle, because I read someplace that a dead short could result in field
demagnetization under the right conditions. There I used a 20 ohm 20 watt
gene heskett wrote:
Well, I did the deed, and I have verified that when the switch is off,
there is a dead short across the receptacle the motor is plugged into.
About 20 tests with the saw motor plugged into it, no effect. Unplug the
saw motor and plug in a cheap Skil router I have
cogoman wrote:
*It seemed counter-intuitive to me, but from reading stepper motor
controller data sheets I've found that if you short out a winding, the
current takes longer to decay than if you put a resistor across it, and
make it pump energy into a higher voltage. I don't know how this
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