Not to belabor it myself, but the 0.025" discs are, in fact, thinner than the mandated groove width which, unless I misread, is counter to what you said in your first post, quoted below.

If anyone tries this, you can check your work -- depth and width -- with a common set of automotive wire gauges.

Burgess
(never surgeoned a vascule in my entire life)

At 05:54 PM 2/4/2004, you wrote:
Not to belabor this but, even though the discs are .025" there's enough
wobble in the mandrel, chuck, and the operator's hand to dig a trench that's
considerably greater than 1/32". Arnie says he built a fixture that allows
for a straight line. That probably works just fine. But I don't believe,
having tried it myself several times, that a person can etch a groove
freehand to the width and depth required by USGA rules. But then, I ain't a
vascular surgeon.

> At 12:08 PM 2/4/2004, you wrote:
> >...As for which dremel disc to use, well, all of them are about the same
> >thickness, which is thicker than the USGA rules allow.
>
> The maximum groove width defined in the Rules of Golf is 0.035"
> http://www.usga.org/rules/books/rules/appendix_II.html
>
> A Dremel #409 wheel is 0.025" thick and can cut a conforming groove
> http://www.dremel.com/productdisplay/bit_template.asp?SKU=409
>
> With the proper fixture, you could also probably use Dremel bits #105,
> #108, and #111.
> http://www.dremel.com/html/products/accessories/carving.html



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