graver geometry calculator

[James]

I just know there is a spreadsheet/calculator or software app. to calculate various parallel heel graver dual angle fixture settings, inputting different lift (relief grind), face angles ect. to give heel yaw angles...example inputting 4 degrees lift, 105 degree v point, 55 degree face to find optimum relief grind angle and optimum heel angle and proper heel yaw angle....

 

[monk]

some time ago, john henley sent such a calculator to this forum. try the search feature to see if it is there. i have it in my system, but do not know how to copy the link to it.

 

[tdelewis]

Mostly it is an elementary geometry problem. This is what I do. After I have ground the face, I set the angle of the heel I want and bring graver down to rest on diamond wheel with the rotation free to turn. I then rotate the dual angle fixture so that there is complete contact along the cutting with diamond wheel. That gives me the angle to set both sides of the heel. Something I found that helps me with correct graver geometry is to coat the graver with a Sharpie marker before you grind the heel. This will show the heel clearly. It also helps my old eyes help to see clearly if the heel is ground correctly.

 

[mobaiz]

Here’s the link to the calculator
http://engraverscafe.com/graver_angles/graver_angles.html

 

[TLP]

Is there a problem with the down load, I can only get page 1 pg 2 and 3 are blank

 

[Frank P]

Is there a problem with the down load, I can only get page 1 pg 2 and 3 are blank

You only need that first page.....

 

[monk]

Is there a problem with the down load, I can only get page 1 pg 2 and 3 are blank

not sure, but the copy i have is only 1 page. that page does the calculating automatically. all one need do is enter a few numbers. nuttin else is needed as far as i know.

 

[tdelewis]

The calculator works fine. You may need to double click in the box with the numbers.

 

[BunLevittron]

Hey guys, having trouble using the calculator; the file appears to be locked and uneditable. Anyone else having this issue?

 

[AllenClapp]

I just know there is a spreadsheet/calculator or software app. to calculate various parallel heel graver dual angle fixture settings, inputting different lift (relief grind), face angles ect. to give heel yaw angles...example inputting 4 degrees lift, 105 degree v point, 55 degree face to find optimum relief grind angle and optimum heel angle and proper heel yaw angle....

Years ago, I found the Ritter Henley calculations and could not replicate them. I believe that there is a slight error somewhere. I could not get a response from them, but could not at the time. The error seems to be not enough to matter much, but not quite correct either. Attached is an explanation of the issues and a set of tables of graver rotation angles for often used configurations, followed by instructions on setting up your own program in EXCEL. These assume that post angle on the original shaping of the vee angle before heels was zero. If you commonly use 2 degrees or so when you do the original shaping, it will not matter. This explanation is also included in the 2025 FEGA Hand Engraving Manual, if you lose this. That manual was revised from less than 100 pages to 360 pages and is the most extensive resource available to engravers to help them expand their capabilities.

 

[dhall]

Well done, Allen!
I was in a Basic Engraving class at GRS with John Henley, probably around 2009. He told me that in his job, he had to come up with sophisticated cutting angles for sharpening/resharpening machine shop tools like lathes, mills, etc., and that they had software to help crunch the numbers for the calculations. He said he'd throw something together and he'd email it to whoever wanted it. In that email, he said he'd accept payment of a beer for the calculator. Real nice guy.

 

[AllenClapp]

Well done, Allen!
I was in a Basic Engraving class at GRS with John Henley, probably around 2009. He told me that in his job, he had to come up with sophisticated cutting angles for sharpening/resharpening machine shop tools like lathes, mills, etc., and that they had software to help crunch the numbers for the calculations. He said he'd throw something together and he'd email it to whoever wanted it. In that email, he said he'd accept payment of a beer for the calculator. Real nice guy.

I tried to find both of them to see why my calcs differ slightly from theirs, but could not do so. It may well be that they assumed some nonzeropost angle for the initial shaping of the sides before heels. With the advent of preshaped gravers, my calcs assume that the graver blank is dead level when initially shaping the sides. The difference is so small that you can't set the difference on your graver sharpening holder.