DIYbanter - View Single Post

Leon[_7_]

On 12/5/2012 11:24 AM, dpb wrote:
On 12/5/2012 7:24 AM, wrote:
On Dec 5, 12:38 am, Leonlcb11211@swbelldotnet wrote:
...

If the saw was running, it will stop if there is a loss of power. Yes
the stop will work if the saw is turned off.
...

You know this for a fact? It's in the product description?

Well, Leon's second sentence is somewhat ambiguous altho if intended
specifically what is written only then I think he's right. Turning the
saw off isn't the same thing as loss of power. Having the two in
juxtaposition as does leads one to easily conclude that is saying that
the actuator would still function in the latter case. I don't know if
that was intended meaning or not.

I think it is correct that it would likely function if one hit the blade
during coastdown after turning the saw off w/ the normal switch (not
removing power from the saw) altho I can't find that specifically
addressed on the SS site.

I do _not_ think from the description it is at all likely that they have
designed it so that it would actuate during coastdown after the external
removal of power. I base this on the following description of
operation-- In order to stop the saw, a fast-acting brake stops the
blade when
contact is detected. The brake includes a heavy-duty spring to push a
block of aluminum, called a brake pawl, into the teeth of the blade
to stop the blade from spinning. The spring is held in compression by
a fuse wire until contact is detected. When contact is detected, the
system sends a surge of electricity through the fuse wire to burn the
wire and release the spring.

I seriously doubt there is a backup supply for that power to the fusible
link after a power outage nor is there any indication of a backup power
supply to keep the microprocessor circuitry functioning after loss of
power to the machine.

--

A simple $5 multi thousand volt capacitor would hold the charge and melt
the fuse wire.