red oak pyramid bow

Download Red Oak Pyramid Bow

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stp by step instructions & complete plans to design a bow

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    I'd been involved in archery and bowhunting when I was younger, shot an oldPSE wheel bow, chased deer around the woods of New Hampshire. But lifeintervened and archery took a backseat. Anyways, some how I got a bug in mybackside to build a bow over spring break. I did a great deal of reading over atpaleoplanet (http://paleoplanet69529.yuku.com/), tradgang(http://tradgang.com/) and primitive archer (http://www.primitivearcher.com/),and I'd suggest anyone who chooses to follow this instructable do a fair share ofreading over there before proceeding.

    So, let's begin, shall we?

    (http://cdn.instructables.com/FKK/XVUT/G6MPGZ9M/FKKXVUTG6MPGZ9M.LARGE.jpg)

    About This Instructable

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    Step 1: First, a confession

    This wasn't the first bow. No the first bow was built using these old Pop Mechplans (http://www.vintageprojects.com/archery/flat-bow-plans.html). However, itwas powerful weak, only 20lbs at 28"s. So after further research i found thedescription of pyramid bows. Not wanting to design another weak bow, I enteredthe dimensions of the Pop Mech bow into Solidworks and recorded the

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    (http://cdn.instructables.com/F0Y/08XJ/G6MPCJFH/F0Y08XJG6MPCJFH.LARGE.jpg)

    (http://cdn.instructables.com/F32/08R8/G6MPCJFG/F3208R8G6MPCJFG.LARGE.jpg)

    archery (/tag/type-id/category-workshop/keyword-

    archery/)

    bow (/tag/type-id/category-workshop/keyword-bow/)

    arrow (/tag/type-id/category-workshop/keyword-

    arrow/)

    oak (/tag/type-id/category-workshop/keyword-oak/)

    shoot (/tag/type-id/category-workshop/keyword-

    shoot/)

    shooting (/tag/type-id/category-workshop/keyword-

    shooting/)

    primitive (/tag/type-id/category-workshop/keyword-

    primitive/)

    fletch (/tag/type-id/category-workshop/keyword-

    fletch/)

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    toxophilus/)

    deer (/tag/type-id/category-workshop/keyword-deer/)

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    Archery Facts (/id/Archery-Facts/)by Blaaken (/member/Blaaken/)

    Fletch Your own Arrows(/id/Fletch-Your-own-Arrows/)by HandymanHammy(/member/HandymanHammy/)55LB Lara Croft, TombRaider Bow HalloweenProp (/id/55LB-Lara-Croft-Tomb-Raider-Bow-Halloween-Prop/)Making Bamboo Arrows(/id/Introduction-70/)by paleotool(/member/paleotool/)

    3$ bamboo longbow(/id/3%24-bamboo-longbow/)by lennyb (/member/lennyb/)

  • displacement under a 20 lb load. I then designed the the new bow in Solidworkssuch that an applied load of 50 Lb resulted in the same displacement as theother bow.

    Step 2: Select your wood

    The easiest wood to begin with is red oak, as it's available at anyhardware/lumber store. I selected a 1"x3"x8' board with the straightest grain Icould find, as well as the widest growth rings and greatest weight relative toother boards in the stack. You will have to dig through the pile, you might needto visit several stores, it's worth it, bad wood, bad bow, bad injuries.

    (http://cdn.instructables.com/FT4/O3PB/G6MPCJG3/FT4O3PBG6MPCJG3.LARGE.jpg)

    (http://cdn.instructables.com/FO7/G5KN/G6MPCJFC/FO7G5KNG6MPCJFC.LARGE.jpg)

  • Step 3: Laying out the bow

    Begin by inspecting the wood, check for any splinters, cracks, knots, if you canwork around them great, if not, go get another piece. Slice a inch off one endand then cut a 70 inch portion off, that will leave a 25 inch section.Take the 70 inch portion and locate and mark the center of each end, snap aline, or use a straight edge to make a line down the plank between these points.Now mark the center of the board. Label the center very clearly. The bow issymmetrical so layout is easy.

    The handle is 4 inches long, one inch wide and centered.The "wedges" are 2 inches long and 2.5 inches wide.

    (http://cdn.instructables.com/F43/B1DA/G6MPCJFF/F43B1DAG6MPCJFF.LARGE.jpg)

    (http://cdn.instructables.com/FHT/Y2PN/G6MPCJFD/FHTY2PNG6MPCJFD.LARGE.jpg)

  • The limbs are 30 inches long and go from the wedges to a width of 3/8thsinches.

    Got that? Pretty simple.

    Step 4: Cut and thin the limbs

    Cut out the limbs, i made a simple jig and used my table saw, took two seconds.Now thin the board down from the stock size to 7/16ths inch. I used a surfaceplaner, you could use a hand plane (yuck) or a table saw to split the plank tothickness.

    (http://cdn.instructables.com/FEL/IVEG/G6MPCJFB/FELIVEGG6MPCJFB.LARGE.jpg)

    (http://cdn.instructables.com/FXU/20KQ/G6MPCJF9/FXU20KQG6MPCJF9.LARGE.jpg)

  • Don't cut out the handle area yet.

    Step 5: The handle

    as is, is too thin, your bow will break there. So we are going to make it thicker,but we also need a smooth transition to the limbs.Start by cutting the saved 25 inch piece to 9 inches. Now using your table sawcarefully feed the piece back an forth across the blade while raising the blade insmall increments. the feather edge should be tangent with the highest point onthe blade. you can make a simple sliding jig to ease the process, I didn't, butwould recommend it. Also I used a 7 inch blade, a 10 inch would have made

    (http://cdn.instructables.com/FFA/I4CS/G6MPCJG1/FFAI4CSG6MPCJG1.LARGE.jpg)

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  • nicer fades.

    Don't worry about getting a perfect paper thin edge, but get close, now you canglue the handle piece to the bow and let it dry at least 24 hours, and then cut outthe handle.

    Step 6: Now the scary parts start

    Right now you have a bow shaped object, and you have to start working it into abow. Start by easing all the corners, this will help prevent "lifting a splinter" whenyou start flexing the bow. After that, cut a couple of thin wedges from scrap andlash then one inch from either end of the limbs.Now make a heavy long string from some cord and we can start working thebow.

    Step 7: Tillering

    (http://cdn.instructables.com/FOZ/IAPA/G6MPGZB3/FOZIAPAG6MPGZB3.LARGE.jpg)

    (http://cdn.instructables.com/FL6/1QI8/G6MPCJFQ/FL61QI8G6MPCJFQ.LARGE.jpg)

  • Here's where it really get's scary, we are gong to start bending the bow to get asmooth curve. We need a tillering stick, i just took a 3 foot piece of 2x4 and cutslots every inch, suboptimal, but workable.

    So put the bow on the stick and start pulling it back, you want a smooth evencurve, you can see my outer limbs are too stiff, so I'll scrape the belly (string)side to thin them. Keep working until you have a tiller you're happy with.

    If at ANYTIME you hear cracking, STOP, get a new piece of wood and go backto step one.

    Step 8: Attach the nock wedges

    (http://cdn.instructables.com/F5T/R8OC/G6MPCJFO/F5TR8OCG6MPCJFO.LARGE.jpg)

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  • I liked the nock wedges over cut nocks on narrow limbs like these, so beingchicken, I spot glued the nocks an inch and a quarter from each end, lashed withhemp twine and soaked with titebond glue. and they still moved when I firststrung the bow!!! Fortunately just a 1/16 and symmetrically so I didn;t have to fixit, but that gives you an idea of the forces involved here.

    Step 9: Finish

    After finish sanding I coated the whole thing with a wax finish I use on myfirearms called variously "gunny paste" "one third finish" etc. a mix of BLO,beeswax and turpentine. Finally, you can wrap the handle with hemp twine, but Ilike the bare wood..

    (http://cdn.instructables.com/FE5/FKZK/G6MPGZ9N/FE5FKZKG6MPGZ9N.LARGE.jpg)

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