Re. the video, clever, but messy.

You always know where the back of the vice is, so;
Use a caliper to measure the stock, or the vice gap, and move forward half
that amount?




On 22 May 2018 at 15:30, Gene Heskett <ghesk...@shentel.net> wrote:

> On Tuesday 22 May 2018 08:12:51 andy pugh wrote:
>
> > On 22 May 2018 at 09:55, Gene Heskett <ghesk...@shentel.net> wrote:
> > > I don't think I've got one of those seesaws,
> >
> > Steel rule.
> >
> I still don't have one. Micrometer, dial indicator, or digital caliper do
> it here.
>
> > https://www.youtube.com/watch?v=m3WWoQDGO2c
>
> Some error, the body of that chuck he has clamped the gage to, is NOT the
> bore holding the tap. Its motion will be the centerline of the spindle.
> Jaw wear may not be holding the tap dead on.  Not to mention that the
> tip of the inverted tap he used is forged, not precision ground, and
> could easily be off center by more than that. I have some in my
> collection that are at least 20 thou off.  Flea market stuff I have to
> sharpen everytime I use them.
>
> Theres right, good enough for the girls we go with, and wrong.
>
> His chances of being wrong are not quite zero but is good enough.  My use
> of the g38.2 to find locations has worked well for over 15 years as long
> as the screws are good. So I'd have to call it good enough for the girls
> I've gone with. :) Its allowed me to drill halfway thru a pcb, turn the
> pcb over and finish the hole from the other side with no visible offsets
> where they meet in the middle of the boards thickness.
>
> --
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
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