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Thread: Width of a spine

  1. #1
    Member mbrossar's Avatar
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    Default Width of a spine

    Is the width of the spine pretty consistent across brands for a given blade size or does it tend to vary by maker? I recently got a 6/8 Le Grelot 3/4 to full hollow ground that looks significantly bigger than the 11/16 REX 1/2 hollow. The spine of the Le Grelot is 37mm. The spine of the REX is 22mm. I really like the weight of the Le Grelot and the REX not so much. I've been eying a 5/8 TI, but I'm not sure if it would be similar in weight to the REX since tehy are both roughly 5/8 blades or if TIs run a little heftier and the weight would be closer to the 6/8 Le Grelot.

    Can someone with a little more experience than I help me out?

    Thanks.

  2. #2
    Comfortably Numb Del1r1um's Avatar
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    do you have any pictures of what you are talking about? I am having a hard time understanding your question, and more specifically determining which part of the razor you are talking about.

    are you actually measuring the spine thickness, if so 37 -22 mm would be WAY too big unless you have a 4 or 5" wide blade or so. Maybe you mean 3.7mm and 2.2mm? (still doesn't seem quite right)
    Last edited by Del1r1um; 01-28-2010 at 11:38 PM.
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    Senior Member matt321's Avatar
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    +1. Those measurements don't look right to me either.

    Anyway, here are dozens of spine thickness versus blade width measurements:
    http://straightrazorpalace.com/razor...zor-angle.html

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    Member mbrossar's Avatar
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    Doh! Not only did I slip a decimal place, I misread my measurement. The REX spine is 4.6mm and the Le Grelot is 6.1mm, but actually, that's just a reference. What I'm really wondering is the general heft/weight of the razor. For a given blade size and grind, are the other general specs of the razor (e.g. weight, spine thickness, etc.) relatively consistent across brands?

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    Never a dull moment hoglahoo's Avatar
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    spine thickness is generally between 1/3 and 1/4 of blade width across the board

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    It may have been answered, but Im going to ask anyways. Is it critical for the stock size to be .250" or can I get away with .1875" (3/16). Let me know. I plan on making one (or 2 or 3) for the first time and need some info. Thanks

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    Senior Member JSmith1983's Avatar
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    With a spine at 3/16 I think the widest you could go would be about 6/8. That is going with 4:1 ratio. Any bigger and the angle of the bevel might be to acute. I have never made a razor, but I was going off the measurements of vintage razors that vary from 3.5:1 to 4:1. Maybe someone that makes razors can chime in with more info.

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    Good to know. Any advice or resources for someone who has never made one? I know and understand the theory, but haven't put it into practice.

  9. #9
    Senior Member blabbermouth edhewitt's Avatar
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    Ok we have two threads developing here, one of which is 4.5 years old, this question would also be better placed in the workshop subforum. As far as i am aware, the spine thickness needs to relate to the blade width (at the point where the spine touches the hone, not the overall width), and should give a bevel angle of around 18 degrees.
    JD, there are loads of threads about making razors in that area too.
    Last edited by edhewitt; 08-21-2014 at 11:13 AM.
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