Re: PCB Routing - Dremel

Hello,

Dremel tools have a rubber sleeve around the front bearing. great for
hand-held use. This presents problems when the tool is used in a
fixed mounting as you would have with a CNC setup. Additionally, the
tools are not designed for continuous operation, though they do seem
to hold up okay for many users. But that rubber sleeve WILL be
affected by the heat of continuous use; become softer, and the tip
will flex more. If the pcb's you're cutting are not fine pitch--or if
your machine is lower-end, accuracy wise-- you may not notice these
effects. But they ARE present...

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
wrote:

> Dremel tools have ball bearings on the shaft which will withstand

axial

> loads.
>
> For machining PCBs, you shouldn't have to worry about axial loads.
> Machining PCBs is much less load than Ol' Joe sharpening his

lawnmower

> blade.
>
> If you can handle the tool before buying it, check for side-to-side
> play, as well as up-and-down play in the spindle. You will probably
> find the Dremel tools are excellent in this regard. If you're
> considering a Chinese import, however, I would check this carefully.
>
> One other note, the Moto-tool with the digital speed control sounds
> like it has feedback to maintain a certain speed, but if you read

the

> manual, it says the speed will vary with the incoming voltage.
>
> What kind of bits are you using to cut the traces? I recently broke

my

> 0.010" end mill (it still works for PCBs though :-)) and am looking

for

> a replacement. I'm considering a 1/8" 60 deg cone shaped single

flute

> carbide bit, and wondering if it will work.
>
> FYI, www.mscdirect.com has the aforementioned bit, as well as PCB
> drills with 1/8" shanks.
>
> Regards,
> JJ
>
> On Tuesday, Feb 10, 2004, at 04:51 US/Eastern, Peter Cruickshank

wrote:

>
> > Hi;
> >
> > I recall seeing some threads regarding the choice of Dremel drill
> > for PCB routing, something about one (or more) of the models has
> > thrust bearing which would prolong it's life if you use it as a

high

> > speed Router Spindle on a Sherline Mill - any ideas ???
> >
> > Didn't someone design a adaptor to attach a dremel to the

sherline Z

> > axis ??
> >
> > Any help greatfully appreciated.
> >
> > CrankShaft.
> >
> >
> >
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