Thanks for the info on the roto ruler. Is the same thing that some people call a click ruler? Also, why wouldn't you just use an electronic talking tape measure instead of something more complicated like this roto ruler?
On Thu, Jun 19, 2008 at 9:18 AM, John Schwery <[EMAIL PROTECTED]> wrote: > A roto rule, named a Rotomatic, has a 6.5 inch measuring unit with > extension bars of 6, 12 and 18 inches. The measuring unit is a 3/8 > inch threaded rod , threaded 16 threads to the inch. This rod is > marked at each half inch and has a nut like object that spins on the > rod. The nub like object is marked on one side for reference. There > is also a locking nut to lock the nut like object in place if > desired. One can measure to an accuracy of 1/64 of an inch. > > earlier, Tom Hodges, wrote: > > >Hi, Tom: > > > >I must have come in on the back-end of this email; what specifically are > you > >referring to? Also, what is a roto rule? > > > >If I want to find the angle of something, I just my Sears 10" electronic > >level and tells you the exact angle. > > > >Thanks, > >Tom > > > >On Wed, Jun 18, 2008 at 7:31 PM, Tom Fowle > ><<mailto:fowle%40ski.org <fowle%2540ski.org>>[EMAIL > >PROTECTED]<fowle%40ski.org>> > wrote: > > > > > wonder why you couldn't have a device with two blades on a pivot with a > > > way > > > to fasten the roto rule across the blades to make up a triangle. > > > Then "simple" trigonometry could let you adjust the ruler to get a > desired > > > angle. This would be where you may have calculated the angle you want > but > > > not have a reference from which to get it. > > > > > > And, obviously you could measure an existing angle with it too if you > > > actually needed the measurement. > > > > > > Yeah, you can find relatively accessible protractors, but something > like > > > this > > > might be pretty easy to fabricate if we get it > > > figgered out correctly, and might be very accurate? > > > > > > So Dan Rossi, help with the gtrig. > > > > > > Let's assume most work would need angles less than 90 degrees as you > can > > > always subtract from 180 and measure the opposite angle. > > > > > > There must be something wrong with this? > > > > > > Thinking caps on plese. We could build a prototype > > > and document it here at Smith-Kettlewell if nobody beats us to it. > > > > > > tom > > > > > > > > > > > > >[Non-text portions of this message have been removed] > > > > > >No virus found in this incoming message. > >Checked by AVG. > >Version: 8.0.100 / Virus Database: 270.4.0/1509 - Release Date: > >6/19/2008 8:00 AM > > John > > [Non-text portions of this message have been removed] > > > [Non-text portions of this message have been removed]
