Transcription
Wooden Dummy Construction and InstallationErrata and Updates for the "Ken Jong"2005-11-14: Construction and Installation Updates Caution: These specs are NOT drawn to scale!Body of dummy is of laminated hard maple (rock maple).Angle between upper and lower leg is approximately 120 degrees.For the arms, the diameter at the fattest part should be increased by about ¼” as compared to these specifications;the slender part of the arm does not need to be changed.The upper arm holes in the spec are shown to be off center. The holes can be constructed on center, but thecritical thing is to maintain a distance between upper arms (when spread apart) of 6 3/8” to 6 5/8” center to center.Our existing slats are made of ash or pecan for best combination of flexibility and strength; Ken recommended tochoose a wood with just slightly less give (but not too stiff). I’ll update these spec once the type of wood isidentified.The mounting slats should ride “free” at the ends to allow flex and give, and should not be “bolted” in place. Leaveat least ½ “ – 1” past the mounting bracket on each end of the slats.Install 4 simple wooden clamps on the slats to prevent the dummy from sliding. Leave just enough “slack” for thedummy to turn and play on the slats without unnecessarily sliding around.Can install 4 additional wooden clamps near inside edge of slats to prevent them from sliding out of the brackets.For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
2006-11-16: Views of dummy redrawn to scaleSee Appendix. Thanks to Uriel Wong for this update.For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
2011-07-24: Updated Notes on Wood for Mounting SlatsThanks to Mark Leong of Hawaii, and Carina Cirrincione of Little Raven Studios for this update."My first choice for the slats is hickory. (hickory and pecan are often sold together because they have very similar properties) Hickoryis very strong, flexible and durable. White oak would be my second choice. I would avoid red oak as it is not as strong as white oak. Iwould not use maple for the slats. Maple is the best wood for the dummy itself, but for the narrow slats, maple is too stiff which makesit brittle when in the form of thin strips like the slats."When choosing the boards make sure you pick ones that have very straight grain. When looking at the wood, site down the length ofthe boards and choose the ones that have the straightest grain that runs the length of the board and does not cut across it. If the graincuts across the board it can be weak in that area."Refer to Appendix 2 for a comparative chart of wood properties.For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
APPENDIX 1: Original DiagramsFor Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
APPENDIX 2: Diagrams redrawn to scaleWooden Dummydummytopview - toSpecs - Trunk to Scale.pdf scale.pdfdummyleg-1- toscale.pdfFor Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
APPENDIX 3: Comparative Physical Properties of Popular Wood SpeciesComparative Physical Properties of Popular Wood SpeciesSpeciesSpecific Gravity†Weight‡ Strength Stiffness Hardness Shock Resisting AbilityBending StrengthShrinkageALDER, RED0.372882139487176123ASH, 61158BEECH0.56459416996135102162BIRCH, SWEET0.646105207104159117154BIRCH, UT0.362768115408064100CATALPA, 5CHERRY, 8111COTTONWOOD, EASTERN0.372864123367362138CUCUMBER TREE, YELLOW0.4434881755710390137CYPRESS, BALD0.423292136527679104For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
194ELM, 87414576138HICKORIES, 155LIMBA0.4534731017028140LOCUST, BLACK0.6648168220161170157103MAHOGANY, AFRICAN0.43319110468808792MAHOGANY, CENTRAL AMERICA0.453211114576839879MAHOGANY, CUBAN0.574195123114718860MAKORE40124MAPLE, RED0.4938871587911093128MAPLE, SILVER0.443371106659369114MAPLE, SUGAR0.5744106178115138114147MERANTI, RED (LAUAN)0.436861385511082117SpeciesSpecific Gravity†Weight‡ Strength Stiffness Hardness Shock Resisting AbilityBending StrengthShrinkage36751385311474103MERANTI, WHITE 912414913669OAKS, COMMERCIAL RED0.564492168103139101143OAKS, COMMERCIAL 105For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
OSAGE-ORANGE0.76PADAUK (AFRICAN)147153432463971571378982PADAUK (ANDAMAN)0.6245152165130101130PADAUK 95PEARWOOD .430102123749410691ROSEWOOD OOD0.8367166181209132141147SONORA D0.4534101123789390138TULIPWOOD, AMERICAN0.382868135405871119TUPELO, WATER0.463587127788182122WALNUT, BLACK (AMERICAN)0.513911316788124111116WILLOW, e: Fine Hardwoods Selectorama 1987 Fine Woods Association.For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
† Based on green volume and oven dry weight‡ Compressive strength (endwise)For Bay Area Wing Chun Student’s Association & AffiliatesKathy Jo B. ConnorsRevised 2017-06-04
For Bay Area Wing Chun Student’s Association & Affiliates Kathy Jo B. Connors Revised 2017-06-04 APPENDIX 2: Diagrams redrawn to scale Wooden Dummy Specs - Trunk to Scale.pdf dummytopview - to scale.
