Re: [CAD_CAM_EDM_DRO] CNC router build

JanRwl@... wrote:

> In a message dated 4/1/2009 7:10:44 A.M. Central Daylight Time,
> freshwatermodels@... writes:
>
> I don't want to get into building a spindle so am looking for alternatives.
> I am wondering if there is a die grinder or dremel type tool that has
> better bearings and might be quieter than a standard router motor.<<
>
> Jack: Google a firm by name Perske (sp?) (Germany). I haven't bought
> from them in over 20 years, but they make DOZENS of kinds of spindle-motors with
> hollow- and collet-shafts, etc. for use in such as X-Y machinery, also the
> HF 3-Ø converter motor-generators for powering the HF versions. Sorry I don't
> have contact info, but I just have had no need for their stuff in decades,
> so lost contact info.
>
>

There is also Precise, sometimes also known as Rockwell-Precise. They
have been making high-speed spindles since about 1960.
I have a 3/4 Hp Rockwell-Precise good for up to 54,000 RPM. The
earliest ones had universal motors and built-in cooling fans.
Mine has a 2-phase induction motor and needs an outboard cooling
blower. I have run it up on a jury-rigged drive and it works pretty
quietly.
These come up on eBay from time to time. Watch out for the AC ones,
though, as there is no standard off-the-shelf drive for them. They
originally used big motor-generator units for the AC ones.

If size isn't a concern, there are Danly-Onsrud router motors, running
several Hp at 15000 RPM or so. These can be run from off-the-shelf VFD
units that will go to 400 Hz.

Jon