I am considering to use a Bosch Colt wood "palm router" (or even a
bigger wood router) as a high speed spindle for milling small detail
on my CNC mill.
Kind of like this:
When I talked about it somewhere, somebody said that it cannot survive
this for long due to poor cooling, and that it will never have the
duty cycle as needed on a CNC machine.
For me, say, 4 minutes on/6 minutes off would probably work out okay,
as the speed of the cutter enables me to complete typical milling jobs
But still, the duty cycle question is important.
So: what do you think is the duty cycle on these and how much could
they take before they overheat?
I know that the head on one of my vendors' CNC router - by itself - cost
over $700.00. It is rated for 5000 hrs continuous duty at 45KRPM before
requiring a bearing overhaul -- which is a factory-only job.
They claim it's good for five re-builds, minimum, if the chuck is never
crashed into the work.
This "head" isn't a router in the conventional sense. It's just a motor
with mount pads and a collet-style chuck on a fairly short shaft.
Nothin' much to look at. But it's virtually silent running at 40K under
no load. It runs on a dedicated speed controller, and is purportedly a
multi-phase motor. The controller was extra $$, and misbehaved badly for
speed regulation and control until swapped out twice by the factory rep.
Don't remember the brand, but it's the one the ShopSabre folks recommend
for the machine.
Probably ok for continuous shallow duty. Notwithstanding, for 100
bucks how can you go wrong? You have 10x that in the holder/bracket
and that great camera. Don't sweat it; if it blows up get a PC 690,
known to run forever at medium duty levels.
http://patwarner.com/ Router Woodworking
On Aug 19, 5:32 am, Ignoramus12820 <ignoramus12...@NOSPAM.
Valid comments but I posted the information as an affordable 3x speeder
was mentioned and IIRC Iggys mill has a 2.5krpm max spindle. It was put
forward for consideration and any decision would then be at the
discretion of the purchaser who has the choice of investigating the
suitability of the kit further for themselves.
Personally I'd be tempted to try the router route as I already have a
variable speed router which can also double as an electric die grinder.
As the other router mentioned it has a cylindrical mounting boss
simplifying the mounting aspect.
This maybe a bit off-topic, but NMTB30 is very popular in Europe, as opposed to
R8, which isn't. It appears that it is exactly
opposite in the states. You may find tooling hard to find and expensive there.
If shipping is an issue, contact me off-line
perhaps I can help.
Here are some options:
I've used the Proxxon die grinder and it worked pretty well for me in light
use. The Kress router should be more robust. The Speeder may work for you
as it is supposed to fit BP-type spindles, though you probably want more
speed than it can give you.
I've got a speeder (belt driven only) which is straight shank.
I got it from eBay some years ago. But I'm holding on to it for my
Just letting you know that they exist -- and once you know what
you are looking for (mine is in a wooden box with a sliding top, FWIW)
your scrounging skills should turn one up.
The main thing when it is mounted is that you have to tell the
CNC to not fully retract the spindle as it clamps to the OD of the
Somebody is talking out of somebody's rear orifice. While you're not
generally going to find one at the business end of a $100,000-$300,000
commercial CNC machine, where a $5000 spindle motor is not a big
expense, tens of thousands of $2,000-$15,000 homebuilt or kitbuilt CNC
routers run them with no particular problems.
Other than being LOUD due to the universal motors, quality wood routers
can be used rather extensively. If you can arrange to feed it clean air
(possibly force-feeding it - ie, put a duct and blower on it), so much
the better. If you actually service/replace the bearings per schedule
(IIRC Porter-Cable specs 100 hours on the 690) better yet.
CNC wood router folks have used them for quite a while - the folks with
money do like to step up to much more expensive and powerful (and
quieter) spindle motors, but in bang/buck the router does fine. I've run
mine for hours at a stretch, and so have a lot of other folks with CNC
routers. Even if you simply run it til it dies and replace, the
bang/buck is good, but servicing it properly the bang/buck should be
Unless you have a specific need for the small size, pick a normal router
over a laminate trimmer/palm router/whatever.
A 690 mounts nicely to a chunk of channel with a big hose clamp, by the
way. Just take the base off.
Crapsman, B&D need not apply...
Get good, comfortable hearing protection - you'll need it.
In (non-cnc) router table service, it's not uncommon to switch one on
and run hundreds of feet of molding though a router, so running them for
hours at a stretch is not some oddity that only CNC router folks do. The
cooling air on a 690 makes one heck of a breeze...
Yes. I was thinking about it as I was walking to work.
I realized that, say, 30,000 RPM is not that big of a deal for a
small spindle on this Bosch Colt. It is not like it is a 2.5"
Bridgeport spindle with huge bearings and huge linear speeds. The
spindle bearings are probably 3/4" ID or there abouts.
The manual on it calls for a factory rebuild (read bearings
replacement) every 300 to 400 hours.
If I can get 300, or even 200, hours out of it, this is all I really
need. It is a lot of hours for a hobby use. Considering that a very
fast head like this can complete projects very quickly due to high
feedrates possible, 200 hours could complete a lot of projects.
Similarly, because it works so fast, it would not need to stay running
for very long, before it completes the assigned task.
I thought for a moment yesterday that I will use my big 2.5 HP router,
but I am backing out of this, it is a little too big and there are
complications with overhang, etc that would impact accuracy too much.
Plus it is inconvenient to mount.
This Bosch Colt looks very appealing, because of ease of mounting,
reasonable power, etc.
I think that I could use it with a 10A solid state relay, because,
IIRC, it has a soft start.
Here it is 300 hours. Not really a problem.
Just what I hoped to hear.
What about something like this:
(Amazon.com product link shortened) />/
I think that it can be taken out of the base and then mounted in some
kind of a round clamp. I have a CNC mill, so I can make an aluminum
clamp that fits perfectly.
Careful with Amazon.com, Iggy.
TRS Recovery Services, Inc. (an extortion ring) has their hooks into them big
Lots of customers have suffered.
Most popular scam is for Amazon to mis-key a customer's bank account
information. The transaction fails and is sold to TRS who
makes the guiltless customer's life Hell until he or she pays TRS
the amount of the transaction, plus an extortion fee.
It gets worse from there.
It happened to me.
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