On Sat, 13 Jul 2019 10:53:10 -0500, dpb wrote:

On 7/13/2019 8:52 AM, wrote:
...

Nothing like that. I walk ~20mi a day (110-130mi/wk unless life
intervenes). I'm pacemaker dependent (heart doesn't beat without it).
I can do pretty much anything you'd likely encounter around one's
house but weld or ride a lawn tractor. Some gas powered lawn equipment
can be a problem but was just told to "be careful" around them. It's
the AC magnetic field (alternator, in this case) that's the problem.
They're shielded against electric fields but not magnetic.

With hospital cost today, The band saw is not worth a heart attack.
...

AH! Thanks for the explanation--now that reminded I knew about the
implant but had forgotten.

But they let you ride in a car, etc., don't they?

A car's alternator is quite a distance from the driver (inverse square
law, and all that). They're also quite well shielded because magnetic
leakage makes them less efficient. Lawn mower part come from the
cheapest Chinese supplier and who knows what's in there. He wouldn't
be concerned if I weren't dependent on the PM.

I'd think it not difficult to put some mu metal can material around it
that would be no issue with interference.

Possible, I suppose, but it would take quite a lot.

I knew there was some concern in early pacemakers; thought that had
mostly been solved by now other than the direct use of welding
equipment, etc., that is pretty good source.

Electric fields are no problem. I wear a bluetooh headset that goes
around my neck, with the business end sitting perhaps two inches from
it. They warned me about some higher end headsets (w/rare earth
magnets) that were strong enough to trip the diagnostic mode (MRI,
etc.) reed switch if they were place directly over it.

I (we all) should be on such a regimen of the exercise!

It's a lot of time that I can't spend doing something fun, like work
in the shop. I do watch a lot of Netflix and Prime while on the
treadmill though (2.5hrs every day). The more inane the better (which
they're really good at). ;-)