On 7/30/2018 8:31 AM, Dr. Deb wrote:
On Saturday, July 28, 2018 at 9:30:20 AM UTC-5, Jack wrote:
On 7/24/2018 12:13 PM, Dr. Deb wrote:

Bill, I have not looked at your motors, but one thing you absolutely need is a TEFC motor, otherwise
the dust will ruin the motor.

Absolutely is a strong word. Most of my stationary tools are circa
1954, including my Rockwell lathe, do not have TEFC motors and have been
running for that many years. The motors now are inclosed in there
respective cabinets except for the contractors saw.

The contractors saw is the only one that ever had a problem. It got
packed with saw dust and needed pulled apart and cleaned or the starter
switch gets stuck. 30 years ago I put a nylon stocking over the cooling
vents to keep out large chunks and it's been running fine with nary a
glitch.

I might add that I'm pretty sure Rockwell sold these tools with the
motors, which always seemed odd to me. Didn't they have TEFC motors back
then?

Not saying you shouldn't use TEFC motors, but I "absolutely" know my
motors have been running for over 60 years w/o them, and no fires, no
nothing other than the TS issue 30 years ago.

To the OP, I've been running stepped pulley's on my lathe since forever,
as have millions of turners. Variable speed motor would be nice, but
not even close to necessary. Make sure your belt is loose enough to
make moving it around easy. As a bonus, the belt slips under a jam.

But, whether or not a TFEC motor is required depends on where its located. Put an unenclosed motor right in the path of dust coming off a lathe and you will have problems. The motors you are talking about are enclosed, with the exception of the table saw, which did have problems.

Well none of my stationary tools were enclosed in a cabinet for the
first 20 years of their life. I built cabinet stands for them and now
the motors are enclosed. My jig saw, drill press and TS are still not
enclosed. Only the table saw had a problem and so far, that was
eliminated simply with a nylon stocking over the vents. I've not needed
the nylon stocking solution with any tool other than the TS. If Bills
motor gives him a problem with dust he can grab a nylon stocking rather
than run out and buy a new, TEFC motor. When that fails, he can run out
and buy a new motor, which in my experience won't be for around 60+
years from now...

Can you run an unenclosed motor? Sure. But an enclosed motor is just less prone to problems.

Just pointing out my experience with non-TEFC motors in my shop. It
stands to reason if buying a motor for a dusty environment, you would go
for TEFC motors. On the other hand, telling Bill he *absolutely must*
use a TEFC motor on his lathe is counter to my 40 years experience with
these tools, and 60 years experience for the tools themselves.

No, my tools are not used constantly as they might in an industrial
setting, but over 60 years, they have seen plenty of use, certainly far
more than enough to contradict the 'absolutely must use TEFC motor'
statement.

--
Jack
Tolerance is the virtue of the man without convictions.
http://jbstein.com