Best edge finder?

[Rickabilly]

(08-29-2012, 07:28 AM)TomG Wrote: And while we are on the subject of edge finders, let's not forget the ultimate edge finder, the chair type.



You just stick them on the side of a steel workpiece (they are magnetic) or hold or clamp them against the side of a non-ferrous workpiece and indicate the slot or hole. Not nearly as handy as the others, but ultra precise. Moore makes one for use in their jig grinders (at over $4K on the Moore website, it's WAY too pricey for me, although I believe Bill Gruby has one). I have to settle for the knock off SPI version.

Tom

It's not often that I see something I've not seen before in milling gadgets, but I've never seen the chair thingy, I suppose the best bit of it is that once you centre to it the spindle is right on zero so no need to offset.

I'm really liking this thread! new gadgets, yipee,
Are they really super accurate? as does seem prone to dirt or swarf getting under the register surfaces especially as a result of the magnets. not to mention being affected by dings or burrs on the edge maybe even a tapered side face. I fear it might appear accurate as you can set up with a DTI and so can fiddle till you have split the difference perfectly, but this doesn't account for the other little issues.

Maybe it's like digital verniers, they aren't more accurate than normal old school verniers, just easier to read and give a number that is recorded to 1/2 a thousandths of an inch when the frame is rarely accurate enough to take repeatable measurements within 2 thousandths of an inch, without special care(maybe just the right amount of care, but, I'm just trying to illustrate a point).

Maybe we should start a "Sister thread" or extend this one to include "centre finders" Another related topic where none of us could possibly have seen all the gadgets.

Actually I'm going to start that thread right now.

Best Regards
Rick