Thread: Not "hollow" not "wedge". Lets do this by the numbers. There ARE numbers you know !!!

Nenad,
I think you are right on the wedge not being quite a slice of pie. Even my oldest, wedgiest of wedges still only touched on edge and spine so must have the slightest degree of relief on the sides....slightly concave.

Tony

In the 'Types of blades:' drawing provided on this thread by GWH then,

The Double Hollow would look like the image XIV
The Full Hollow would look like XII
The Half Hollow like VIII
Quarter Hollow IV
an Wedge I or II

Is that about right?

What's this about indicating the Double Concave Grind?
How does the provided image not display that?
How could it be shown, or what am I missing? I don't know how you could show that.

X

X,
I think Randy was refering to a grind where the side is not completely a concave from spine to edge. On many the concave section stops just behind the edge resulting in a slight widening which strengthens the edge.

Tony

Originally Posted by Tony Miller

X,
I think Randy was refering to a grind where the side is not completely a concave from spine to edge. On many the concave section stops just behind the edge resulting in a slight widening which strengthens the edge.

Tony

...are you referring to the 'belly' on the full-hollow shown above?

-whatever

-Lou

Yep, that's it alright.

Tony

I'm sure that the original diagram at the start of this thread is from the 1914 Henckels catalogue as it shows 16 degrees of grind - there were also numerous depths and blade shapes. I agree it's a bit confusing but it has to be remembered that this was the heyday of the straight and makers were selling thousands and thousands a year. Nowadays even Dovo only have 'half-hollow' 'hollow' and 'extra-hollow' (the hilariously named - to english-speakers anyway - 'Klang' blade - conjures up all soirts of mayhem!).

The point is that when dealing with vintage razors there IS this variation of 16 grinds - though to be fair most are between 1-3 (wedge) and 8-10 (full hollow). It's a best-guess with a bit of know-how!

Here's what is being used in the wiki - if we can get a more complete or accurate graphic that would be awesome

This is relevant to the razor database. The term "full-hollow" seems to be used quite wrongly by some manufacturers (if not all of them.) So when I added some entries I went by the diagram, not what the razors were sold as.

Originally Posted by Rajagra

The term "full-hollow" seems to be used quite wrongly by some manufacturers (if not all of them.)

+1. My DD is a true full hollow, yet my new Dovo (advertised as a full hollow) is definitely beefier and requires a bit of change in technique to get the same level of shave.

In grading razors according to Hencker's scale, I find helpful as a final check the use of a modified chart (see below) that underlines the portion of blade which can be considered very thin and straight. Also, "relative grading" can be a good resource: start comparing blades between them and put them in order (increasing hollow) before going to the chart. Hope this can help!