On 2012-10-07, Ignoramus14555 <ignoram...@NOSPAM.14555.invalid> wrote:
> On 2012-10-06, DoN. Nichols <
BPdnic...@d-and-d.com> wrote:
>> If you want to see just how much of a mess burning a liter of
>> Vactra No. 2 makes, take a look here:
>>
>> <
http://www.d-and-d.com/DISASTER/SHOP-1/index.html>
>>
>> I can't really spend much time in there with my asthma and all
>> the burnt oil and plastic fumes. (Including whatever the leftover from
>> burning Teflon insulation may happen to be.)
>
> DoN, thanks a lot for bringing those pictures.
>
> Based on your story, I added a cron job to E-Stop my Bridgeport
> Interact every day at 6pm.
Good plan -- as long as you never expect to use it through that
period. :-)
> I do not want it to be left "up" and forgotten for possibly days, as
> in on weekend.
>
> When E-stopped, there is NO power to the lube pump, servos, DC drives
> etc.
That was the plan for this. But I had a box with switches to
enable various things during testing. (Everything is controlled by sold
state relays.)
The reason which I *had* for switching off the lube pump was
experience with an Anilam conversion of a Taiwanese Bridgeport clone
which we had at work. If the controller box was left on, the lube pump
would run all night, or all weekend, and we would find a puddle in the
base of the machine -- all wasted Vacra No. 2.
I also planned a timer so the lube pump would have to be on for
fifteen minutes (the cycle time) before the servo amps and the spindle
motor's VFD would be enabled.
I'm not sure, but I *think* that the fire got started rather
quickly after I left the room. (I smelled nothing before I left, and it
was just a few minutes accepting a plate of food from my wife in the
kitchen and then heading upstairs when I smelled the fire.)
The main trick (assuming that you have an equally old lube pump)
is to make sure that there is nothing flamable near it. There was a
long cardboard box, and the protective cover from a fluorescent fixture
not yet fully installed) leaning against it, and bumped by the table
during test drives with a pot (also in the box) controlling the servo
amps. It caught fire and carried it down to the floor below the lube
pump.
I think that without the path to the floor, the fire on top of
the pump would have simply burned itself out without having lit off the
contents of the reservoir.
Good Luck,