On 7/9/2017 4:43 PM, dpb wrote:
On 07/09/2017 2:27 PM, Leon wrote:
...


I wonder if the shapers, and mostly because they spin at a relative low
RPM compared to a TS blade, if they could make an electromagnetic brake
much like cordless drills use.
...

All the shapers I've got are 3X or so the rpm of of TS...even the low
range on the 2-speed is 7,000 rpm. A 10" TS manufacturer's max tip
speed will limit RPM to something under 5,000 to 5,500 iirc w/o looking
up specific numbers.

OH! Nevermind. I was under the impression that they ran really slow,
not just much slower than a router. Thanks for pointing that out.





Anyways, shapers run at quite a lot higher rpm than do TS's owing to the
tip diameter of cutters being smaller so need it for the tip speed.

Think routers; 20 to 27,000 ain't unusual for the same reason; the
router bit diameter is much smaller so needs to spin faster to compensate.


Yeah I remember that now, IIRC I mentioned on a post, several posts ago,
that tip speed was important on any tool/cutter. IIRC the discussion
was why you could not put a router bit in a drill press and get
satisfactory results.



There's quite a lot of mass on a 1" shaper spindle w/ a 6" panel-raiser
on it...it'd take a sizeable EM to shut it down quickly enough to make
and difference on the accident scenario methinks...

--
Totally agreed! Your lights would dim, probably. ;~)