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Bingham Projects 801.399.3470 Fax: 801.399.3471 58” Recurve 1 3/4” Limb Width 35#.............................. .240” 40#.............................. .246” 45#.............................. .252” 50#.............................. .258” 55#.............................. .264” 60#.............................. .270” 65#.............................. .276” 70#.............................. .282” Bow Draw Weight Chart 58” & 60” Recurve 60” Recurve 1 3/4” Limb Width 35#.............................. .250” 40#.............................. .256” 45#.............................. .262” 50#.............................. .268” 55#.............................. .274” 60#.............................. .280” 65#.............................. .286” 70#.............................. .292” 2” Limb Width 2” Limb Width 35#.............................. .230” 35#.............................. .240” 40#.............................. .236” 40#.............................. .246” 45#.............................. .242” 45#.............................. .252” 50#.............................. .248” 50#.............................. .258” 55#.............................. .254” 55#.............................. .264” 60#.............................. .260” 60#.............................. .270” 65#.............................. .266” 65#.............................. .276” 70#.............................. .272” 70#.............................. .282” Take-Down Recurve (measured without wedge inserted) 1 3/4” Limb Width 58” Take-Down Recurve 35#.............................. .204” 40#.............................. .212” 45#.............................. .220” 50#.............................. .226” 55#.............................. .232” 60#.............................. .240” 65#.............................. .246” 70#.............................. .252” Add .015” for 60” Take-Down Add .030” for 62” Take-Down 58”, 60”, & 62” use 8 1/4” wedge. 35#.............................. .221” 40#.............................. .228” 45#.............................. .234” 50#.............................. .240” 55#.............................. .247” 60#.............................. .255” 65#.............................. .261” 70#.............................. .267” Add .015” for 66” Take-Down Add .030” for 68” Take-Down 64”, 66”, & 68” use 10 1/4” wedge. 2” Limb Width 58” Take-Down Recurve 35#.............................. .199” 40#.............................. .205” 45#.............................. .212” 50#.............................. .219” 55#.............................. .225” 60#.............................. .230” 65#.............................. .236” 70#.............................. .242” Add .015” for 60” Take-Down Add .030” for 62” Take-Down 58”, 60”, & 62” use 8 1/4” wedge. 64” Take-Down Recurve 64” Take-Down Recurve 35#.............................. .215” 40#.............................. .222” 45#.............................. .228” 50#.............................. .233” 55#.............................. .239” 60#.............................. .245” 65#.............................. .251” 70#.............................. .257” Add .015” for 66” Take-Down Add .030” for 68” Take-Down 64”, 66”, & 68” use 10 1/4” wedge. 68” Longbow 35#.............................. .344” 40#.............................. .359” 45#.............................. .374” 50#.............................. .389” 55#.............................. .404” 60#.............................. .418” 65#.............................. .427” 70#.............................. .435” 64” Reflex/Deflex Longbow 35#.............................. .331” 40#.............................. .346” 45#.............................. .361” 50#.............................. .376” 55#.............................. .391” 60#.............................. .406” 65#.............................. .414” 70#.............................. .422” 62” Hybrid Longbow 35#.............................. .295” 40#.............................. .310” 45#.............................. .325” 50#.............................. .340” 55#.............................. .355” 60#.............................. .370” 65#.............................. .378” 70#.............................. .386” 68” Take-Down Longbow (measured without wedge inserted) Shallow Reflex/Deflex 35#.............................. .328” 40#.............................. .344” 45#.............................. .359” 50#.............................. .374” 55#.............................. .389” 60#.............................. .404” 65#.............................. .418” 70#.............................. .427” Pronounced Reflex/Deflex 35#.............................. .260” 40#.............................. .275” 45#.............................. .290” 50#.............................. .305” 55#.............................. .320” 60#.............................. .335” 65#.............................. .343” 70#.............................. .351” NOTE: Draw weights will vary if bow design, bow length, bow width or riser length is changed. Bow length is measured from string groove to string groove on back of bow, following the inside curve. -26- www.binghamprojects.com
Helpful Hints for the Novice Bow Builder (FAQ) It is a very gratifying experience to build your own traditional bow, and then to shoot that same bow with predictable accuracy. It is my hope that each of you will become a successful bowyer and archer. There are a few false notions and some common problems in building bows which new bowyers should be cautioned against. After more than fifty-two years in the archery business, either building or teaching others to build bows, I have been asked thousands of questions about bows and related items. I have compiled the answers to these questions in an attempt to prevent problems that might frustrate a novice bowyer. I am concerned that I might not fully understand the whole bow making process. How do I get started? The first concern is the most important. Watch the video and read the instructional materials carefully, plan your procedures in detail, and make a dry-run with all materials and equipment you will need. If, after carefully doing these things, you still have questions, please feel free to call us before beginning your project. How Should I choose my Bow Draw Weight? Make archery fun. Choose a bow draw weight that is comfortable, less than what you are capable of pulling. Many new archers become discouraged and quickly lose interest in the sport when the bow is so heavy that it is not fun to shoot, or when the bow is so heavy that accuracy is lost. Most states have a legal weight of 40-50 lbs. for big game. On a cold fall day when you are stalking a buck, a lighter bow is a joy to shoot. The secret to success is in accuracy, not in muscle. In target practice or tournament shooting, an even lighter draw weight may be more desirable. A heavier bow can be considered once you have practiced, muscles are firming up and you are getting a feel for archery. Bow Design It is of great concern to me that some prospective first-time bowyers want to revolutionize archery design. It seems to be human nature to feel that your own design will bring about superior performance and artistic design immediately. Personal pride in one’s own handiwork is notable, but remember that experimentation is usually a slow, painful, and often expensive process. Sometimes a change in recurve design can cause limb twist, weight change, and a lessening in performance. You will notice that, in a general sense, the limb design is very similar throughout the archery industry. Often bows from various manufacturers will appear different because the riser section (handle) may vary in design, shape or color of material. How do I get rid of hand shock? I am asked repeatedly about hand shock. You often notice this when shooting a longbow for the first time. After you have shot for a while, you will become less aware of this when you release the arrow. You are less likely to notice this when shooting a recurve, take-down recurve or even a take-down longbow. It is a simple law of physics, relating to weight and mass. The flat longbow has a heavy, long limb and a short, light riser. The motion of the long limb cannot be absorbed by the smaller riser, thus the hand shock. When compared to the longbow, the recurve and take-down recurve limb is shorter and lighter with a larger and heavier riser; the shock of the lighter limb moving forward is absorbed by the riser, thus lessening the hand shock and giving the “soft feel”. What is “stacking”? “Stacking” is a term which also bothers novices. This is the amount of increase in weight as the bow is drawn. It occurs in all bows, but can be intensified in three ways. First, the bow may be too short for the draw length. A longer bow could help this problem. Second, the ratio of fiberglass weight or thickness should also be increased. Third, the more radical, or pronounced, the limb design, the more the stack will increase. The use of multiple tapers in a limb can also cause stacking. Which bow limb laminations should I choose? For many centuries bows were made from a solid piece of wood such as yew or osage. The bows were household tools used to hunt food and as protection from enemies. Most of these were longbows. Later, recurve styles were laminated with strips of sinew or horn for more efficiency. Now we have high-tech materials which have revolutionized the archery world, both in efficiency and design. Compound bows are usually built from solid fiberglass limbs because of the great stress in the limb design. Traditional bows, however, are built from outer layers of glass laminate over wood cores. The vast majority of today’s bowyers use a core wood or cane laminate combined with an outer layer of Bo-Tuff Glass. Bow draw weight is determined by the thickness of these two materials. Bow design and length also determine poundage. Careful records of micrometer readings of total limb thickness can be very helpful in determining bow weight. Weight control is a science which must be mastered by a good bowyer. Instructions from manufacturers and suppliers are also invaluable to the novice. Example: The Bingham 58” Take-Down Recurve bow will vary approximately 1 lb. for every change of .001 of an inch in thickness. The Bingham longbow will change approximately 1 lb. for every change of .003 of an inch in thickness. Bow Glass laminations come in several widths, thicknesses, lengths and colors. There are a number of core woods available that can be used in bow limbs. Refer to this catalog for a list of many of the most beautiful and best performing core wood and cane laminations. These laminations can be purchased either tapered or parallel. Tapers are most commonly used in a .002 per inch taper 36” long. Some bowyers use several tapers with a .001” taper per running inch. I prefer a combination of a taper used with parallels. With this combination, you achieve excellent limb action and a fast, smooth limb. Overlays can be glued to limb tips to furnish additional strength and color. Core laminations may be dyed to add variety under clear glass. Always use a water or alcohol based dye. Which riser should I choose? With traditional bows (Recurves, Take- Down Recurves, Longbows and Take- Down Longbows), riser (handle) woods are chosen for color, beauty of grain, strength and ability to take a good finish. Avoid soft woods as they cannot stand the stress of a working bow. Avoid those woods with an open grain structure, those that will “bleed” color, or those whose oily nature prohibits a good finish. With the advanced technology of high stressed limbs found in compound bows came multi-lamination risers made from blocks of 1/16” veneer. These laminated risers are very strong and are available in many colors. Another way to achieve a colorful riser is to laminate combinations of accent strips made of hardwood, phenolic or core-tuff. This will furnish strength and beauty. What is the difference between UL and ULS glass? ULS has a 50/50 woven fiberglass inlay (scrim) that provides cross strength (90 degrees to the longitudinal axis). This scrim layer will give strength lengthwise to help reduce longitudinal cracking. For most designs, however, UL and ULS work equally well. Bingham Projects 801.399.3470 Fax: 801.399.3471 -27- www.binghamprojects.com
Page 1 and 2: Since 1959 BINGHAM PROJECTS, INC. C
Page 3 and 4: Bingham Bows 60” Recurve with Alt
Page 5 and 6: Glass Laminations Authorized Distri
Page 7 and 8: Wood & Cane Core Laminations Cocobo
Page 9 and 10: Building Your Own 58” & 60” Rec
Page 11 and 12: Building Your Own Longbow 68”Flat
Page 13 and 14: Bow Building Components Instruction
Page 15 and 16: 68” Take-Down Longbow Shallow Ref
Page 17 and 18: Bow Building Components & Bowyer To
Page 19 and 20: String Making Supplies & Accessorie
Page 21 and 22: GT1455 Gold Tip Expedition Hunter C
Page 23 and 24: Trueflight Feathers Arrow Making Su
Page 25 and 26: Arrow Making Supplies & Accessories
Page 27: D. 2718 Martin Bow Stringer - Will
Page 32: Over a half century ago, ElMont L.

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