Re: [CAD_CAM_EDM_DRO] Positioning

Some yes, some no.
Have you ever made a zero-backlash rotary, for astronomy ?

> Obsession with precision is the realm of the noob, they eventually buy a
> machine and discover not only is it hard to achieve, but unnecessary.
>
> At that point they get side-tracked by either the fun of making stuff, or
> building something bigger and/or faster.
>
> Some people never get past that first point.
>

Yes !

> I've gotten side-tracked by lasers, and no-one talks about precision. They
> all cut better than a thou, so any discussions are a bit pointless. Things
> like bevels, smoke control, back-flash, auto-focus etc are more
> interesting.
>
> (Lasers can be a bit too precise. I made some little lidded boxes (MDF) a
> while back; the lid went on, and didn't come off. A vacuum (ok, low
> pressure) packs a lot of force. Even had finger notches. Cut new ones with
> just a whisker of clearance rather than none.)
>

Yes .. and no.
Modelmakers need to have good fits, so the engines run.

> Besides, good design and technique will beat "precision" most days, and
> probably every day in the hobbyist field.
>

YES !

> Suppose you need two plates with identical holes bored though them. Do you
> obsess with trying to bore the holes one by one precisely as possible,
> or do
> you clamp them together and drill both at once? So they're a thou out,
> they're precisely matched and that's more important. Want more? Use the
> first as a guide to make the 3rd and 4th. Making engines? Learn how to
> lap, and match the piston to the cylinder.
>

No !

> People who think they're working in microns are kidding themselves.
>

No!
Handwork to microns is feasible.
Lapping,scraping,optics,bearing fits.

> People who think that machine in their shed is capable of microns are
> kidding themselves.
>

No.
I am fitting P2 bearings.

> People who think you need to work in microns are really kidding
> themselves.
>
> Ah well, we all need a hobby. Fantasising counts, I guess.
>
> Tony

--
-hanermo (cnc designs)