Illustration of Safety Razor Parameters (Blade Exposure, Guard Span, Blade Gap, Etc.)

Discussion in 'General Shaving Discussion' started by ShavingByTheNumbers, Oct 17, 2017.

    I sure wish a moderator would strongly consider making this thread a sticky, because I find myself looking for it often as I read discussions of razor mechanics (rigidity, etc.). It's a go-to reference for me, and probably for others.
  1. 3rd Version with Blade Reveal Added

    Below is an updated version of the illustration for safety razor parameters around the blade cutting edge, which applies both for DE and SE razors. This third version involves two changes: (1) blade reveal has been added and (2) the bullet point on blade rigidity has been improved.

    For a given razor, an increase in blade width causes increases in blade reveal and blade exposure. However, when comparing different razors, more blade reveal does not mean more blade exposure. Blade reveal should not be confused with blade exposure. Blade rigidity may seem dependent on blade reveal, but blade rigidity actually depends on free-end and clamp distances, along with blade thickness and the elastic modulus of the blade material. Blade rigidity is, nevertheless, related to blade reveal in that free-end and clamp distances increase with increasing blade reveal.

    It is hoped that this updated version will become the standard reference illustration for safety razor parameters with respect to neutral-, steep-, and shallow-angle shaving.

  2. I've created a ShaveWiki page as a reliable location for the most up-to-date illustration and information about safety razor parameters:

    Safety Razor Parameters: Illustrated and Defined

    Please use the wiki page whenever referencing this material. Thanks.
  3. Absolutely fantastic write ups. Great stuff to sink your teeth into after a shave and having the morning cup of joe. A concise, analytical breakdown on shaving parameters that is fairly easy to follow and understandable for pretty much all here. Excellent stuff here by @ShavingByTheNumbers. Bravo amigo...:a14:
  4. Thanks, Gus! :001_smile What you wrote was what I was going for! :thumbup1:
  5. Brilliant!
  6. This has been very helpful, took a lot of effort but really worth while. Thank you Shaving By The Numbers.

    Does anyone else think shaving with the razor angled parallel to the " Shave plane", when both the guard and top cap are on the skin the way to use each razor as it was designed. I think of this as a neutral shave angle. Not to claim that how the designer's intention for his/her razor's is angle actually the way to get the best shave from that razor. But should each razor at least be tried that way to experience how the razor designer intended all the elements of the razor - blade angle, blade exposure, blade gap, head weight, etc. -to work together? I am trying it, rather than defaulting to steep or shallow, the result is some razors work really differently when used as I am guessing they were designed to be used. My milder razors - EJ 89, Timeless .68 - seem to cut closer. Haven't tried it with my really aggressive razors yet, but will be doing that.
    Anyone else exploring this?
  7. Chan Eil Whiskers

    Chan Eil Whiskers Contributor Ambassador

    Captain of the Design (meme).jpg

    Usually, yes.


    But, not always.

    Happy shaves,

  8. Chan Eil Whiskers

    Chan Eil Whiskers Contributor Ambassador

    2013 R41 is not aggressive when used steep. In my experience of course.
  9. Yes, agree, and that is how I have been using it. Same with Ikon Tech, CG OC lvl3 and Futur wide open. Will be revisiting them to see what they were designed to shave like. Since the milder razors gave a closer shave when used with a neutral angle, guard and cap both on skin, it scares me to think what these aggressive razors will be like used that way.
    Anyone compare steep angle to "designed angle" with other aggressive razors besides R41?

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