Yeah -- Old memories. My cousin was cutting moulding with a Craftsman
3-blader many years ago on a RAS. He felt a thud on one hand and looked
down at his shirt which was covered with blood, tissue and bone fragments.
You can guess the rest. The damage was limited to the end of one finger
above the joint.
The surgery and recoup from trying to restore part of the fingertip was
almost worse than the injury itself. Horrible looking mess. He was a union
utility worker at the time and had to have all of his digets in working
He is a talented woodworker to this day but the old RAS, and moulding head
is ancient history to him.
Ok, lets stop and think here for a moment. This single head cutter is not a
fluke, flash in the pan tool that was here today and gone tomorrow. I first
saw them some 25 years ago. I have heard of no incidents regarding problems
with the cutter, have you?
True they probably do not leave as smooth of a cut given the same feed rate
but as long as the cutter is balanced there should be no vibration. I
suspect that if there was significant vibration that the tool would have
never made it out of the R&D department.
Huge and heavy by comparison engine crank shafts are very irregular in shape
and when balanced can spin at speeds in excess of 12,000 rpms.
Yeah - I have occasionally been tempted to calculate the tip speed of the
cutters running on my table saw and compare it to a 30-06. I'll bet they
are in the same neighborhood if one came off. Like I said earlier, mine is
on the shelf but doesn't get a lot of use.
Of course you could say the same about other tools.
I had a safety freak shop teacher in high school who used ask questions on
his tests of how many times a tool could hit you or cut you before the
signal would reach the brain to react. The big damage is done long before
you pull the hand away.
Fast moving metal and flesh are not compatable.
Not even close, actually. Following is a very rough approximation:
Typical molding head has a diameter of 7 or 8 inches. Circumference then is
about two feet. 2' x 4500 rpm = 9000 fpm = 150 fps or about 100mph.
Much too fast to dodge, but nowhere near the muzzle velocity of any rifle.
Doug Miller (alphageek at milmac dot com)
No, the tip speed on you TS is no where near a 30-06, or a 22 for that
matter. The typical 10" blade turns at about 3600 rpm. The blade is 31.4
inches around or 2.61 feet around. 2.61' x 3600 + 9420' per minute. That
comes out to about 107 MPH. IIRC the typical 22 has a muzzle velocity of
around 1100 feet per second and that comes out to about 7 times faster. A
30-06 with a 150 grain bullet travels at about 2700 feet per second or about
17 times faster than your saw blade. If you are spinning a smaller diameter
dado or molding cutter the tip speed would be slower than the 10" blade.
Hello,new here but seems strange that tommorow I will be using the
cutter head (3) again and yes I am afraid of it, the weird noise and
the wind it makes. Although have you tried it on a radial arm? Now
that is spooky but hey by the end of this year I will have the router
completely set up, and I feel fairly safe with the router. Have a good
Jim in WI
I too would prefer a router or a shaper for the job, but that's because I
generally try to stay away from tools that have been adapted to a secondary
use. Having said that, if you think about the speed of your router and the
speed of your table saw, and you throw in the fact that routers have been
known to throw carbide (especially with cheap bits), you might be more
concerned about that router. It's typically somewhere near 3 to 6 times
faster than that table saw blade.
Although it would be a relativly small hole at those speeds it would go
straight throug you assuming you hit no bone. Assuming also you have hit no
major organs I hope you keep at least 2 band aids in your safety kit.
Naw. The fragment might cut you cut certainly not go through you. I have
been hit by fragments of wood many times thought the years and they mostly
bounce off. And while that is only wood, I have also had fragments of
carbide go flying also and never see any signs of it hitting anything.
Do you think a pro baseball pitcher could throw a small fragment of carbide
hard enough to go through your arm or hand? Not likely and he can throw
pretty much as fast as the tip speed op a 10" blade on a TS.
I have had a fragment of a 22 bullet hit me and it did not penetrate
although I did receive a red spot.
There simply is not enough mass to overcome the resistance.
Now if a whole tooth or cutter came loose, that would be a different story,
still I don't think it would go through you as a 22 bullet seldom goes
through at speeds 7 time faster.
That's not necessary. The comments you are replying to were simply in
response to the preceding comment which speculated that the speed of a
cutter coming off would approximate the speed of a 30-06 bullet.
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