Gritomatic Laser Goniometer

karnaknives

karnaknives

Joined
Jul 28, 2021
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1,251
I have a Gritomatic Laser Goniometer on the way.
I don't "need" this but at the price it looks interesting enough to check it out.
I bought the "Lite" version. I hope i'm not wrong but I didn't see enough value add for me to spend for the Master or Pro versions.

Do any of you use one, and do you have any thoughts / tips / hints that might help?
Thank you!
 
Only 1 available now is Pro, that was fast. But resolution ratio, degree / mm, is higher 0.37 instead of Lite's 0.59
 
scottc3 said:
Only 1 available now is Pro, that was fast. But resolution ratio, degree / mm, is higher 0.37 instead of Lite's 0.59
Click to expand...
I know that one difference between the Pro and the Lite is a 3" vs 2" blade width maximum, and I don't see the 2" capacity of the Lite as a problem for me.

I do not entirely understand what the difference in the "resolution ratio" means real world.
Can you explain?

Screen Shot 2021-12-28 at 2.31.50 PM.png
 
Not really, other then finer grain resolution might prove useful for dental or surgical sharpening metrics. Gonna ask a buddy who practices dentistry but still cleans as well.
 
Maybe like measuring range of motion as a flexibility metric, a measure of fitness being different for various sports and competitive levels.
 
I ordered the Lite version, too. Guess I got in before they sold out! Looking forward to playing with it. Curious what it will do with convex/freehand blades.
 
I chose the Lite version because I didn't need the larger blade capacity for the price difference.
I also don't think I needed a finer resolution, for my uses. I think I chose correctly, but it would be great to hear from someone who could say from experience.
As I said above, I don't need this device, but if it makes the process of finding or checking angles quicker I'll consider it money well spent.

And yes, it'll be interesting to see how it handles convex blades.
 
This video seems to be using the Lite version that Gritomatic is selling. Good info. Gritomatic's description is incorrect with regard to the primary and microbevels. The inner most bands represent the blade's primary grind (sides of the knife). The outside bands reflect the secondary, or edge bevel. If there's a microbevel on the blade those reflections will be outside of the secondary bevel.

 
I have the Master version from Gritomatic, and I really like it. Definitely not something one "needs", but it's nice to have.

I'm sure the Lite version will likely be every bit as good. All it basically is, is a laser pointed at the edge which deflects the beam on a scale, so I can't imagine that the Lite version won't be every bit as good as Master version when it comes to reading the angle.

Let us know how they work!
 
777 Edge said:
I have the Master version from Gritomatic, and I really like it. Definitely not something one "needs", but it's nice to have.

I'm sure the Lite version will likely be every bit as good. All it basically is, is a laser pointed at the edge which deflects the beam on a scale, so I can't imagine that the Lite version won't be every bit as good as Master version when it comes to reading the angle.

Let us know how they work!
Click to expand...
Will do. Aside from width capacity, I think the advantage of the more expensive versions is that they center/clamp the blade. With the Lite version you hold the blade and center it freehand. I guess you can do it reasonably well by equalizing the distance of the bevel reflections, but that won't tell us if the grind is uneven.
 
Doing it freehand with the Lite version will work perfectly fine I reckon. The reflection you get will depend on how much of a polish or haze your edge has on it. Sometimes you have to guess the average with a lot of reflection on the scale, even with the Master version.
 
3D Anvil said:
Will do. Aside from width capacity, I think the advantage of the more expensive versions is that they center/clamp the blade. With the Lite version you hold the blade and center it freehand. I guess you can do it reasonably well by equalizing the distance of the bevel reflections, but that won't tell us if the grind is uneven.
Click to expand...
It's easy to tell when the grind is uneven. Equalize the reflection made by the primary grind. If the reflection made by the secondary angle is even, the grind is even. If the reflection hits different numbers on each side of the scale the grind is uneven.

O.B.
 
karnaknives said:
I know that one difference between the Pro and the Lite is a 3" vs 2" blade width maximum, and I don't see the 2" capacity of the Lite as a problem for me.

I do not entirely understand what the difference in the "resolution ratio" means real world.
Can you explain?

View attachment 1710588
Click to expand...

RE: "resolution ratio"

Assuming you are asking about the "Scale resolution" variance between models, I would assume it applicable like anything related to resolution. Larger resolution means easier to differentiate graduations on a scale.

Example Comparison:
Lite Scale Resolution: 1° = 1.7mm (1° of angle = 1.7mm on scale) Scale graduations are smaller, therefore harder to differentiate = decreased accuracy of measure.
Pro Scale Resolution: 1° = 2.7mm (1° of angle = 2.7mm on scale) Scale graduations are larger, therefore easier to differentiate = increased accuracy of measure.

The tube (where the printer scale resides) is larger in diameter on the Pro Version providing clearance for taller blade, and as a result the movement of the reflected laser is greater therefore easier to differentiate = increased accuracy.

Kind of the same principle to enlarging a photo of a yard stick makes it easier to read because the distance between the graduations is larger, except in this case the "yardstick" is printed inside the tube. Larger tube = larger scale.
 
resolution ratio called out at Gritomatic = scale range of 1 degree per scale resolution in mm for each type of tool... and Pro is in stock!:

Lite
📐Scale range: -36°...+36°
📏Scale resolution: 1° = 1.7 mm
🔪Blade capacity: 49 mm
🔋CR2032 battery
🖐Manual
Pro
📐Scale range: -28°...+28°
📏Scale resolution: 1° = 2.7 mm
🔪Blade capacity: 80 mm
🔋CR2032 battery
🖐Manual
Master
📐Scale range: -44°...+44°
📏Scale resolution: 1° = 1.8 mm
🔪Blade capacity: 51 mm
🔋Built-in battery with micro USB
🧲Magnets-assisted
 
I have a Lite and a Master (with magnets). I find them extremely useful, especially when reprofiling blades. One result of having a goniometer is that you find out that an awful lot of knives have bad grinds.

Both of them broke recently. On the lite, the battery holder fell out. On the Master, when I was trying to position a knife I had just sharpened, the knife sliced off one of the little platforms that the edge is supposed to rest on. The Master is still usable.
 
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