Re: [CAD_CAM_EDM_DRO] Re: Moore jig borer tooling

>---A More jig borer and a Bridgeport milling machine are two
>completely different animals. I have an old Moore book around
>somewhere that describes the precision that goes into their product
>and how to work to close limits on Moore and other machines. If I
>remember correctly, there is a heating element in the spindle bearing
>of the Moore jig borer that keeps the bearing at a constant temp.
>looking through the book you realize just much the trade has changed
>and just how easier it is now with computer controlled edm
>Terry Ackland

Yes, they are two different animals, for one thing you aren't supposed to
mill on a jig borer, although in the book I think you refer to "Holes,
contours and surfaces" they show milling out a prototype for an aluminum
part. I think for the most part the spindle bearings aren't set up for
much side force.

My jig borer has not a spindle heater, but a thermometer on the spindle. I
think you were supposed to use a chart to correct for the distance of
expansion in the Y axis. I suppose that digital readouts make that all
immaterial. Since I don't have the three phase wired up to it yet, it now
charts room temperature quite nicely.

David M. Munro