RE: [CAD_CAM_EDM_DRO] Positioning

Agreed.


Figuring optics requires us to work in microns all day.


And precision worm drives require that we routinely work with .0001"
accuracy.


And this is the norm with optics and telescope mounts, not the exception.


Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com






-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
Sent: Saturday, June 07, 2014 7:52 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: 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)






------------------------------------
Posted by: Hannu Venermo <gcode.fi@...>
------------------------------------


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