Homebrew PCBs

Hey Jan,
 I noticed the warm running also, especially with the oil that was in it
and then using 20 wt. spindle oil. It never got hot so I don't think
there's any problem. My Engis hand pieces for my 2 speed flex shaft also
get warm when they're running.
 The Pencil Die Grinder did run cooler, and faster, when I switch over to a
thinner air tool oil by Slick 50 called Air Tool One.

 Yeah boyz it does eat air, I've got a 6 hp compressor and it doesn't have
any problem, I don't think a compressor of less than 1 1/2 to 3 hp would
work for extended periods. I've got also got a tired old 1 hp compressor
that I wouldn't even attempt to run the grinder on.

 I'm just collecting stuff now for a PCB mill but won't start building
anything until late fall when my busy season ends. The die grinder will
probably collect dust until then. If I do try anything semi-interesting,
I'll post it here.
Denny


At 03:16 AM 06/15/2002 -0000, you wrote:

>Denny:  Just got in the Enco 1/8" "air Die Grinder" with VERY nice 
>1/8" collet, precision collet-nut and nose, and cloth braided O.D. 
>air-hose with flexible muffler over that.  Runs VERY fast, and 
>exhaust is out the top, but without the muffler-tube over the hose, 
>it is very noisy!  Eats air!  The average 3/4 hp compressor would 
>probably run more than 50% of the time, if this thing was left on, 
>with nothing else using the same air.  I only played with it "out of 
>the box" a minute or two, and it gets rapidly warm in half nearer the 
>collet, so I guess it needs some 3-1 oil squirted down the air-hose, 
>first.  We'll see.   I have no immmediate application, as my PCB-
>drill has that 400 Hz, 12,000 motor, but looks like this might work 
>if a cleverly-machined hardened/ground shaft-jacket were machined 
>over it, and it then used in a linear ball-bearing arrangement.  
>Else, it would have to be mounted in a kludge with linear bearings, 
>etc.  The alum. body is 15.5 mm (0.610"), so would take some work to 
>use it in a linear ball-bearing mount.
>
>
>
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