Well ... that may depend on how old it is. I have a Craftsman
router from about 1976 which would clamp nicely to some channel (with
clearance milled for the larger air intake at the top) which would
probably do quite well for the task.
But more recent ones are certainly not as durable.
You have compressed air available and the router will be fixed on the
machine, so just adapt it for forced cooling air. Fabricate a manifold
to introduce the cooling air (via a filter and a throttling valve) to
the top intake of the router. You'll benefit both from the cooling
action of the decompressed air, as well as a clean air source.
You know Pete, this is a good idea. It definitely needs a good filter,
but it is a great suggestion. It may be that I can find a "turbine"
for paint sprayers that would deliver more air at the pressure that I
need, as opposed to a compressor.
After a lot of thinking, etc, I have decided to bite the bullet and
bought this Bosch router:
Bosch 1617EVS 2-1/4 HP Variable-Speed Router
(Amazon.com product link shortened) />/
It is only marginally more expensive than Colt, and should be trivial
to mount in a clamp, due to its round body. The speed range of 8,000
to 25,000 RPM is also ideal for me. Soft start is also a huge plus. It
comes with a 1/2 and 1/4" collet.
On Aug 19, 1:00 pm, Ignoramus12820 <ignoramus12...@NOSPAM.
I know of a few CNC's (General Gorilla) that use those 2.25HP (1/2"
shank!!!!) Bosch's in school settings. Aside from the noise, they're
holding up very well.
Shopbot also sells a 3.25 HP universal motor PC router body that also
seems to run quite well.... but they do offer rebuild-kits matter of
I run an Elte 3HP 3phase spindle off a VFD and it runs quietly and
full power at any speed....and cool.
I have put 100's of hours on a PC 690, used for wood as well as high
density polyethelene (hdpe) with 1/2" diameter bits running 3 inches/
second (60% cut, 1/4" max depth per cut).
Wore the brushes out, replaced them from the ShopBot spares kit,
original bearings still working just fine. The dust collection does
pull the exhaust air from the collet end (the only danger I saw was
the sparks from brush end of life and fine sawdust mixing ... no fires
or explosions, thank you very much.
I tend to run the 690 on the middle of the 5 available speeds ... no
noise reduction, just adjusted everything for shavings per bit
Hope this helps.
I used to work in a place that used router tables to trim plastic. The
routers were working continuously for up to three hours at a time. Only
thing they ever needed was normal bearing replacement. Porter Cable 690
I wouldn't worry about it . That thing has a fan , and it'll be blowing
chips out of it's own way . If you want something with more oomph , check
out the Porter Cable line of 1/2" capacity routers - they go up to 2+HP and
have a motor housing that's designed to be clamped in a base or fixture .
Just make sure you don't get coolant up inside the motor , that can get
We use Hitachi 3hp plunge routers. They often run 8 hours a day. They last
6 months and then I throw them away. We used to get them rebuilt but the
cost curve says "pitch 'em!". Usually, the bearings go first but that's not
all...everything just wears out! I have boxes and boxes of all the
accoutrements that come with these that never get used. I just can't pitch
them. I more than get my money out of them!
For your use, you're gold!
On Thu, 19 Aug 2010 07:32:16 -0500, Ignoramus12820
The Colt is the standard router for the CNC Shark sold by Rockler.
It's one loud sucker but a good unit.
You can also get aftermarket collets for it for the purpose
So it's fair to say quite a few people disagree with the fellow you
I haven't tried those collets but I will say that the factory collet
seems to get hot even with a short, non-taxing cut, in a way my normal
routers never do under any circumstance. I don't know if this is the
collet or the router, but it doesn't seem to hurt anything other than
my fingertips if I don't give it a bit to cool down.
On Thu, 19 Aug 2010 07:32:16 -0500, Ignoramus12820 wrote:
Without reading this whole thread I will throw in my 2 cents worth. I am
more familiar with woodworking and routers than with metalworking. I
have had routers in router tables that literally ran continuous for 8 to
10 hours per day, day in and day out, some carrying fairly heavy bits.
They do have cooling fans, and in most router tables they are upside down
so they must have fans to keep them from filling up with chips.
Recommendations would be DeWalt, Porter Cable, Bosch, some of the older
commercial Black and Decker units, or, if you can find one, a Stanley
round top router. I prefer the Stanley because they are easy to mount,
all metal, have a very strong bearing setup, and tend to be quieter than
most because they turn slower (usually around 18,000 rpm instead of
25,000) and have such a strong bearing mount.
Duty cycle depends on load.
If you have a 1/2 inch 3 HP router that draws 20 ampos at full load,
and you run it at about 7 amps you can likely run it constantly
without ever coming close to over-heating it. Duty cycle is generally
pretty closely related to the ability of a device to shed excessive
heat I know my 13 amp router gets plenty hot if worked hard for 15
minutes without reducing the load, yet stays comfortable to the touch
if lightly loaded for the same period of time.. My lirrle Stanley (all
metal trademaster? from the sixties) cools pretty well when rinning
with the5/8 inch? plane trimming door edges.
And remember to blow out the fan area and keep it clean -
more air flow and less heat.
Going around corners might be a time to unload it cool it off
and attack the next side. If slots ... between cuts.
Sometimes light turning cools faster than sitting off.
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