Re: [CAD_CAM_EDM_DRO] Positioning

Tony .. sometimes you dont come across as positive, thoughtful, or pleasant.
You also keep adding crap to posts, and making interferences where none
exist.
I hope its not intentional.

(The re: to price vs accuracy.
I never mentioned price - just that the cheap scales are inaccurate, and
how much.)

Accuracy 0.02 mm
Its a crap piece that does not even state over what distance, or that
its +/- the 0.02 mm.
http://www.amazon.com/Neiko-01407A-Extra-Large-SAE-Metric-Conversion/dp/B000GSLKIW/ref=lp_2476630011_1_1?s=industrial&ie=UTF8&qid=1401813648&sr=1-1
Likewise.
http://www.harborfreight.com/6-inch-digital-caliper-47257.html

This one states, correctly, that the accuracy decreases the bigger it gets.
http://www.maplin.co.uk/p/electronic-digital-calliper-n48aa
+/- 0.04 mm/300 mm.
and thus 0.08 over 600 mm.

I have a 600 mm digital cailper, a cheap piece of chinese crap, that has
the 0.08 mm.
Mostly, all instruments have the accuracy data on the package.

On 03/06/2014 11:02, 'Tony Smith' ajsmith1968@...
[CAD_CAM_EDM_DRO] wrote:

> If you have a source for their inaccuracy (apart from your rather
> fertile imagination) let’s see it. 0.04mm? Hah.
>
> Capacitive scales have two drawbacks – they’re affected by oil & crud
> and have slow-ish data rates (50 readings per second?). Doesn’t stop
> people using them though. The ‘jitter’ people find with those scales
> is power supply problems, usually caused when powered from a DRO
> rather than battery. Or RF, but that happens to everything.

--
-hanermo (cnc designs)