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Yumi Build Along

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Hillbilly Deluxe:
     Thanks for all of the web-sites, they are all very helpful for anyone else planning on starting a yumi. These were essentially a majority of the info that I found as well on yumi construction which is why I thought I would do the build along.

     The web-site for Frank's where I got the boo is: www.franksupply.com they have all different sizes. I got the glue and core bamboo from: www.rudderbows.com they have a tremendous amount of bow and arrow making supplies and are very professional.
 
     Core:
     So for the core I decided to go with the oak. I got a 1x3 with really good grains and then chased a ring all the way down the back, then tapered the belly down to the widths I wanted. I was also thinking 3/8 might be a little thick. I will post the final dimensions I came up with when I get it sanded down and ready to glue up. I am shooting for around 10mm in the handle. I also used the 1x3 so that I could lay it out so that it had a little bit of bend to the right at the bottom, allowing the bow to spin in your hand when shot. I am also planning on heat tempering the core and belly this should help keep it from crysalizing. I am also thinking that with the exceptional length of the yumi that will help spread out some of the stress.

     Back / Belly:
     For the back I will not heat treat it and here are the dimensions; handle: 5mm, upper tip: 3mm, lower tip: 2mm. For the belly, once again I will temper it and the dimensions are as follows; 5mm the entire length.
     Here is some information I found on lengths from another web-site. I then put the English equivalent down for all of us Yankees.


Archer's Height         Arrow Length         Bow Length         
                             
150 cm-           59"       85 cm -        33.5"      Sansun-tsumari      212 cm   83.5"
                            
150-165 cm   65"      85-90 cm       35.5"      Namisun              221 cm   87"
                           
165-180 cm   71"      90-100 cm       39"      Nisun-nobi              227 cm   89.5"
                           
180-195 cm   77"      100-105 cm    41"      Yonsun-nobi      233 cm   91.7"
                           
195-205 cm   81"      105-110 cm    43"      Rokusun-nobi      239 cm   94"
                           
205 cm+           85"      110 cm+       45"      Hassun-nobi      245 cm   96.5"


     Hope all of this helps, I will post some pics. as well. I have to make some wedges and get some pieces for the syahs before I can glue it up bit I will post as soon as I can. Until then shoot straight!

Hillbilly Deluxe:
Here is a pic. of the core after being roughed out, showing the grains.

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Hillbilly Deluxe:
Reverse the words for the last two pics.

Here is the core looking down the belly and shows the curve to the right.

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Hillbilly Deluxe:
Here are the end of the belly and back after they have been planed down using a belt sander and some 60 grit.

[attachment deleted by admin]

Hillbilly Deluxe:
   I just ordered some ebony for the tips, here is the web-site: www.exoticwood.biz they have a lot of selections and most of there stock is turning blanks, so I think that it will work excellent for this application. I think that I am going to do a black handle that fades into red with the black ebony tips again, then finish it all off with tru-oil. I think this will somewhat emulate a urishi finish.

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