Rick
I should have read throught the entire thread as I was thinking about one of these
http://www.leevalley.com/en/wood/page.aspx?p=67350&cat=1,43513
Typical resolution for these types of sensors is about 0.05 degrees. This isn't the same as accuracy but if you are using them to measure the difference between two angles they are very accurate.
iphones and ipads have these sensors built in. I have an inclinometer app for the ipad (free). I don't have it with me so I can't say what the resolution is. Everyone needs a $500 angle sensor in their shop LOL.
I believe Ron is correct that the protractors use a rotory encoder implemented in the way you have described it.
JohnW
--- In gingery_machines@yahoogroups.com, "RG Sparber" <rgsparber@...> wrote:
>
> JohnW,
>
> I would be surprised if the scheme you describe could resolve to 0.05
> degrees but technology continues to amaze me.
>
> I was thinking that they are taking a linear caliper, bending the artwork
> into a circle, and then bending the slider to match. The electronics might
> not even have to change. It can't be much of a change for them to charge
> less than $20.
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com
> [mailto:gingery_machines@yahoogroups.com] On Behalf Of tjwal
> Sent: Tuesday, September 06, 2011 7:13 AM
> To: gingery_machines@yahoogroups.com
> Subject: [gingery_machines] Re: new article: A Low Cost "Digital" Angle Gage
>
> Rick
> AFAIK the angle sensing is done with an accelerometer chip which utilizes a
> weight suspended by a network of strain gages. Of course this is all in
> nano-scale and built into a tiny little chip. As the chip is tilted the
> strains change accordingly and you can calculate the change in tilt. A
> similar design is used in chip based gyroscopes. For those who fly RC
> helicopters these have been revolutionary.
>
> JohnW
>
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