Re: [CAD_CAM_EDM_DRO] high frequency spindle motors

Bob Simon wrote:

>Well, I saved some money on the AC Tech drive. It seems that all three
>Precise spindles I acquired had at least one phase burned out in the
>windings. I checked the water jackets and all were hopelessly plugged with
>gradoo. These early spindles didn't have a thermostat in them to report an
>overheat fault back to the drive. Once the water flow stopped, it was toast
>city. At least the price was right, they were salvage from a dumpster. Now
>I know why they ended up there.
>

Arrgh! I'd better check mine, although it is an air-cooled spindle. I
think I checked the terminals
and the readings looked OK.

>I opened up the spindle assemblies and saw there are a lot of appropriate
>components for a DIY bench top milling spindle. Nice bearing housings and
>labyrinth type seals. They use common Barden 103g angular contact bearing
>pairs. A little pricey, but easy to find.
>
>

It might still be possible to rewind these spindles without massive
effort, depending on the
way they are built.

Jon