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Small Sebenza Full Back Spacer...

Discussion in 'Chris Reeve Knives' started by BOOMER52, Sep 27, 2016.

  1. BOOMER52

    BOOMER52 CNC Custom Scalesmaker Knifemaker / Craftsman / Service Provider

    499
    Feb 27, 2013
    I was requested by an individual to design and machine several carbon fiber and black canvas Micarta full back spacers for his small Sebenza. It was an interesting enough project that I decided to tackle it.

    First I needed to disassemble the knife and scan the presentation side slab and blade. Once the scan files were imported into my CAD application... I then located the critical landmarks and traced the profiles. I then designed the full length back spacer using the CAD drawings of the blade and slab to insure sufficient clearance between the back spacer and the closed blade.

    It was immediately apparent that the back spacer's depth along the spine was going to require a separate fluting operation to create a linear clearance slot for the blade's belly. That's not all that difficult… just fiddly and will require a custom jig.

    I wrote the Gcode and tested the output using scrap G10. Made the necessary tweaks and locked down the code. I machined the carbon fiber spacers first. I was using a .0394" end mill and broke three bits during the machining. I moved on to the Micarta and machined those without any issues. Lastly I needed to create a setup jig and machine the linear blade clearance slots. That went well.

    Once all the machining was finished all the back spacers were hand finished for a mic'd thickness of .147" using #600 emory cloth and a surfacing plate.

    Et viola'…

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    lex2006 likes this.
  2. Wrobelan

    Wrobelan

    309
    Aug 28, 2011
    Very impressive work! Your explanation was very interesting and informative. Thanks!!!
     
  3. SMBH

    SMBH

    59
    Dec 15, 2015
    Superb! Adds beauty to an already extremely aesthetic blade.
     
  4. kidcongo

    kidcongo Basic Member Basic Member

    Jan 12, 2013
    I really like that. Can you explain to me what keeps the back spacer in place, instead of it hinging open, if you get what I mean? Does it rely on the lanyard pin?
     
  5. Andy the Aussie

    Andy the Aussie Platinum Member Platinum Member

    Jan 29, 2010
    Brilliant :)
     
  6. Wavicle

    Wavicle

    369
    Jul 22, 2014
    Same question here. I don't see the capture point for the forward location other than it resting on the stop pin.

    Otherwise, I agree with others- it adds some slick dimensionality to the titanium slabs, in addition to being practical as a guard.
     
  7. Jackal87

    Jackal87

    217
    Feb 2, 2016
    Wow, you did a great job, really nice.. Really he adds "depth" to a great knife as the Sebenza..
     
  8. BOOMER52

    BOOMER52 CNC Custom Scalesmaker Knifemaker / Craftsman / Service Provider

    499
    Feb 27, 2013
    YES… the lanyard pin prevents any hinging action. Without capturing the lanyard pin the spacer would have a single point of fixation and capable of rotation.

    With regards to the stop pin as the resting point for the forward end of the spacer… there is no way to implement any fixed capture. The formed rest is much more solid and secure than stopping the spacer short of the pin and having it cantilevered.
    [​IMG]
     
  9. Anarchy84

    Anarchy84 Gold Member Gold Member

    571
    Jul 3, 2016
    Very cool. Nice work.
     
  10. Ernie1980

    Ernie1980 Gold Member Gold Member

    Apr 19, 2012
    Nice work! The carbon fiber looks nice:thumbup:
     
  11. red mag

    red mag

    Apr 12, 1999
    Fantastic work.
     
  12. jonnieb27

    jonnieb27 Basic Member Basic Member

    106
    Sep 13, 2008
    Fascinating report.
     
  13. gull wing

    gull wing Basic Member Basic Member

    May 4, 2002
    Very nice!
     
  14. 91bravo

    91bravo Gold Member Gold Member

    Jun 29, 2008
    Nice work as always Steve!
     
  15. TTTis

    TTTis Gold Member Gold Member

    602
    Mar 8, 2010
    Can't wait to get em! Steve is truly a pleasure to work with and his work is awesome.

    Had this designed off of inspiration from Brad Southard's, but just wanted to see a full length spacer.

    I've been using another full length hand made spacer for over two years with this same design over the stop pin, the spacer never moves. With the screw and lanyard pin securing and pressure from the scales it's super solid. However now to have them perfectly machined to match the perfect machining in the Sebenza, very cool.

    I dig Brad's, but think the part of the blade (in closed position) that benefits most from a spacer is the heel. CRK does a great job of packing a ton of blade into the handle, but depending on blade age the edge can be very close to the handle spine near the heel. Went through a couple designs over the years, but this one was definitely the winner. Took me a while to find someone willing to take it on, but was lucky to find Steve.

    Thanks again!
     
    JordonC2 likes this.
  16. Kilo11

    Kilo11 Gold Member Gold Member

    170
    Dec 7, 2013
    Carbon fiber spacer for the large Seb 21 also available ???
     
  17. Andy the Aussie

    Andy the Aussie Platinum Member Platinum Member

    Jan 29, 2010
    ...... my thoughts exactly !!!! :D
     
  18. aengina

    aengina

    79
    Jul 25, 2010
    It won't work with a large because of the non-stepped lanyard pin. Unless you found a way around that issue.

    Sent from my HTC6525LVW using Tapatalk
     
  19. TTTis

    TTTis Gold Member Gold Member

    602
    Mar 8, 2010
    MXG Gear makes a stepped pin for the large. However Steve had mentioned this being a one off, so I don't know if a large would be in the cards. I believe southard used a custom made pin for his.
     
  20. marthinus

    marthinus KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Dec 10, 2006
    Very nice work. Much more accurate than I ever could do in the past.
     

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