On Sun, 14 Jul 2019 07:54:34 -0500, dpb wrote:

On 7/13/2019 7:46 PM, wrote:
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.

While never a good idea to take too many chances, I'd expect there's
really very little difference at all between the two. Other than
perhaps the proximity factor.

It would be an interesting exercise to actually measure...unless, of
course, you really don't want to use the tractor any more as a side
objective! VBG

Well, this is the second year we've paid someone to do it. ;-)

I couldn't survive on the place here any longer w/o the utility tractors
and the manlift...they're my crutches for everything that I can't manage
to do by hand any more that was so trivial at 18...

I'm not about to even try do it with a walk-behind anymore. I did
that half of the first year we liven in this house. I did nothing
else. It took four evenings a week. Some weeks there weren't that
many without rain. and July and August are typically 90F with
humidity to match. I'd never had a tractor before because I never had
more than a 1/2 acre. Some of those years we had a teenage slave.
Better than a tractor but then again, I only had to argue with my
tractor the first start of the year. ;-)