what is the round laser thing for angles called?

Hi,
Its called a goniometer, see laser Goniometer portable model and Help interpreting goniometer results

I don't see why you couldn't do a dIy, its just a clamp, cylinder, laser pointer ...
but its not hard to measure apex angles,
hold blade/edge vertical,
tilt a rod(pen) covered with newspaper at an angle,
when the edge bites into the paper, thats the angle of the apex
the other way to find angles is with permanent marker/sharpie , hold blade vertical (or horizontal), tilt your sharpening stone, and observe where the marker is removed

update: if have digital camera, could always take a picture, then measure the angle using gimp/inkscape...
 
Last edited:
Or use thermoplastic and a USB microscope: http://knife.wickededgeusa.com/foru...asure-and-view-a-edge-profile-check-this-out/

26097792203_ac98e99a33_z.jpg
 
Or get your self an ERU; you can measure and sharpen with the same tool, including the stropping. Accurate within 30 minutes.

Fits in the palm of your hand.

Fred

edgeru.com
 
bucketstove said:
update: if have digital camera, could always take a picture, then measure the angle using gimp/inkscape...
Click to expand...

Just curious how you would do that, can you post a sample picture? The only way I can think of, would be a macro picture of the tip but than you can only measure the angle at the tip.
 
Last edited:
Fred.Rowe said:
Or get your self an ERU; you can measure and sharpen with the same tool, including the stropping. Accurate within 30 minutes.
Click to expand...

So how would that work with an uneven sharpened edge, i.e. 14 degrees on one side and 19 degrees on the other side?

Why not just say accurate within 0.5 degrees? The markings on the Eru are in degrees, not arcminutes are they?
 
Last edited:
fvdk said:
So how would that work with an uneven sharpened edge, i.e. 14 degrees on one side and 19 degrees on the other side?

Why not just say accurate within 0.5 degrees? The markings on the Eru are in degrees, not arcminutes are they?
Click to expand...

I'm a field surveyor, using degrees, minutes and seconds is something I do out of habit.

An edge that is 5 degrees in error from one side to the other should be quite visible by eye. But to clarify use the ERU.

Run a marked edge, as you describe, through a 30 degree V setting; where the marker is removed will indicate where the edge is off the desired angle. If the 30 degree setting doesn't give you the information needed widen or narrow the opening as indicated by the abrasion marks.

Regards, Fred
 
You must log in or register to reply here.
Back
Top