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ADHESIVES 3 JOINERY

ADHESIVES 3 JOINERY. ADHESIVES. TWO MAIN INGREDIENTS – RESIN – GLUE SOLID SOLVENT – KEEPS LIQUIFIED UNTIL APPLIED. ADHESIVES. How does glue work?

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ADHESIVES 3 JOINERY

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  1. ADHESIVES 3 JOINERY

  2. ADHESIVES TWO MAIN INGREDIENTS – • RESIN – GLUE SOLID • SOLVENT – KEEPS LIQUIFIED UNTIL APPLIED

  3. ADHESIVES How does glue work? • Specific adhesion - results from strong molecular attraction between the wood and the glue and for this to occur, the adhesive must penetrate the wood cells and "wet" the fibers. • Cohesion - the force which makes the glue stick to itself. This is the solid glue "line" in a joint. It is the strongest when the two pieces to be joined are machined so they mate as closely as possible

  4. ADHESIVES HOW DO ADHESIVES CURE? • SOME HARDEN (SOLVENT EVAPORATES) • SOME CHANGE CHEMICALLY • SOME HARDEN AS THEY COOL

  5. ADHESIVES GLUE PROPERTIES • WORKABILITY • DURABILITY

  6. ADHESIVES WORKING PROPERTIES • SHELF OR POT LIFE • OPEN ASSEMBLY TIME • CLOSED ASSEMBLY TIME (IN CLAMP) • CURE TIME (FULL STRENGTH) • SANDABILITY • WORKING TEMPERATURE RANGE • STRENGTH

  7. ADHESIVES types • Hide Glue • Polyvinyl Resin Glue (PVA) • white glue – longer open time, harder to sand • Aliphatic Resin Glue (Modified PVA) • yellow glue – shorter open time, easier to sand • Polyurethane glue – Gorilla Glue • Contact Cement • water based 3M Fast Bond 30 • solvent based 3M Scotch Brand

  8. ADHESIVES types-liquid hide glue • Hide Glue - Titebond Liquid Hide provides superior creep-resistance, offers excellent sandability and is unaffected by finishes. Its sensitivity to moisture allows for easy disassembly of parts, a critical benefit in antique restoration or the repair of musical instruments.

  9. ADHESIVES types-PVA Titebond® Glue • The cabinetmaker's standard. Titebond Original Wood Glue is the industry standard for woodworking. A ready-to-use aliphatic resin adhesive with outstanding strength. Also Titebond Dark Wood glue for dark woods is available • It provides a strong initial tack and fast speed of set to reduce clamp time. It also develops a bond stronger than the wood itself, offers excellent sandability and is unaffected by finishes. The cabinetmaker's standard. • Sets fast, sands easily and resists moisture. Available in regular original wood glue formula or in dark color formula for dark color woods.

  10. ADHESIVES types-PVA Titebond® II Premium Wood Glue • Works great outdoors. Titebond II Premium Wood Glue is the only leading brand, one-part wood glue that passes the ANSI Type II water-resistance specification. It is ideal for exterior wood-working projects, including outdoor furniture, birdhouses, mailboxes, planters and picnic tables. Polyaliphatic Resin Polymer • Titebond II Premium provides a strong initial tack, fast speed of set, superior strength and excellent sandability. It is FDA approved for indirect food contact (cutting boards) and is ideal for radio frequency (R-F) gluing systems.

  11. ADHESIVES type – advanced polymer • Titebond™ III Ultimate Wood Glue • Superior waterproof wood glue is ideal for exterior and interior woodworking! Available in five sizes. • Stronger, safer, easier to clean up and less expensive than polyurethane glues. • Allows eight minutes of open time and has an application temperature as low as 47º F. • One hour clamp time! • Cleans up with water. • Does not foam.

  12. ADHESIVES types Titebond® Polyurethane Glue • Good for indoors or outdoors. • Titebond Polyurethane Glue is a breakthrough in adhesive technology. It is the only polyurethane glue to combine a long 20 minute working time with a short 45 minute clamp time. It is a versatile, professional-strength glue specifically formulated for multi-purpose applications. • In addition to its superior wood-to-wood performance, Titebond Polyurethane Glue is ideal for metals, ceramics, most plastics, HPL, Corain, stone and other porous/non-porous materials. It is ready-to-use, offers excellent sandability and is unaffected by finishes.

  13. ADHESIVES types Gorilla Glue • The original premium quality polyurethane glue now available in a smaller size! Gorilla bonds virtually everything, indoors or outdoors! No mixing required. Bonds wood, stone, metal, ceramics and plastics without a glue line. 100 percent waterproof. Environmentally safe once cured. • SpecificationsCoverage: minimum of a 1/2 oz. per Sq. ft. Single-sidedOpen Working Time: 20 minutes or moreClamping Time:1-4 hrs. at 68°-130° F. Heavy hardwoods may require longerCures: 90% in 1-4 hrs. 100% in 24 hrs.Temp. Range: 40-130° best at 68-130°Moisture Content: Best results from 10-25% Below 10%, apply water to non glue surface.Shelf Life: 3 yrs. + unopened. Up to 1 yr openedExpansion: Non-thermoplastic. Will not expand or contract in the glue line after hardening.

  14. ADHESIVES types - PVA Titebond® Wood Molding Glue • Titebond Wood Molding Glue is the thickest, fastest-drying glue available for use with porous and semi-porous materials. It is ideal for finish trim, crown molding, baseboards, window casings and other applications requiring a professional-strength, no-run wood glue. • Titebond Wood Molding provides a strong initial tack and fast speed of set, yet allows realignment of working pieces. It also develops a bond stronger than the wood itself, offers excellent sandability and is unaffected by finishes.

  15. ADHESIVES types • Contact Adhesive • water based 3M Fast Bond 30NF • solvent based 3M Scotch Grip Contact Adhesive 10 • Uses – Plastic Laminate, veneers, edgebanding

  16. ADHESIVES types • Your brain after using water based contact cement

  17. ADHESIVES types Your brain after using solvent based contact cement

  18. ADHESIVES types • Hot Melt Glue

  19. ADHESIVES types – hot melt

  20. ADHESIVES clamping THREE REASONS TO USE CLAMPS: • DRY FIT • KEEP PARTS ALIGNED WHILE GLUE CURES • MOST GLUES REQUIRE PRESSURE • BRINGS MEMBERS INTO CONTACT • SQUEEZE OUT AIR • THIN OUT GLUE –NO THICKER THAN A PIECE OF PAPER

  21. ADHESIVES clamping • Clamp Layout – 1” from edge and 8” to 10” intervals

  22. ADHESIVES clamping

  23. ADHESIVES clamping

  24. ADHESIVES clamping HOW MUCH PRESSURE IS REQUIRED? • Low Density Woods – 100 to 150 PSI • PINE • Medium Density Woods – 150 to 250 PSI • ALDER • High Density Hardwoods – UP to 300 PSI • RED OAK • HPL – 30 to 80 PSI • Veneer – 100 to 125 PSI

  25. ADHESIVES clamping How Much Pressure Can Be Exerted By A Clamp? • Wood Screw Clamp – 800 to 1000 # • Bar Clamp – Up to 2000# • C-clamp – 1000# • Spring Clamp – 25#

  26. GLUING & WOOD MOVEMENT • Wood Is Hygroscopic • Most Movement Occurs Tangentially • Wood Cups Towards The Bark Side

  27. GLUING AND WOOD MOVEMENT

  28. GLUING AND WOOD MOVEMENT

  29. WOOD MOVEMENT & GLUING Least Effective Joint Alignment

  30. WOOD MOVEMENT & GLUING More Effective

  31. WOOD MOVEMENT & GLUING • Most effective

  32. JOINERY SIDE GRAIN JOINTS STRONG

  33. JOINERY FLAT GRAIN JOINTS STRONG

  34. JOINERY END GRAIN TO END GRAIN WEAK

  35. JOINERY END GRAIN TO SIDE GRAIN WEAK

  36. JOINERY – mortise & tenon • OPEN MORTISE & TENON

  37. JOINERY mortise & tenon THROUGH TENON

  38. JOINERY dado PLAIN DADO

  39. JOINERY dado STOP DADO

  40. JOINERY lap • END LAP

  41. JOINERY corner joints • RABBET JOINT

  42. JOINERY corner joints SPLINED CORNER JOINT

  43. JOINERY corner joints LOCK SHOULDER

  44. JOINERY corner joints DOVETAIL

  45. JOINERY miter MITER JOINT WITH SPLINE

  46. JOINERY edge to edge EDGE TO EDGE SPLINE JOINT

  47. DOWELED JOINTS The Strength Of A Doweled Assembly Is Directly Related To: • The Tensile Strength Of The Dowels • The Distance Between The Dowel Centers • Half The Distance Between The Dowel Center And The Shoulder

  48. DOWEL PLACEMENT 2” STILE & RAIL Strength of Dowels • Distance between centers + ½ center of one dowel to shoulder 11/4” + (3/8”/2) = 1 7/16 1 7/16 X Sheer Strength of Dowel Increasing the distance between the dowel centers is twice as effective as increasing the shoulder between the dowel and the edge of the rail.

  49. DOWEL PLACEMENT • 2” STILE & RAIL • Strength of Dowels • Distance between centers + ½ center of one dowel to shoulder 1” + (½”/2 ) = 1 ¼

  50. DOWEL PLACEMENT • 2” STILE & RAIL • Strength of Dowels • Distance between centers + ½ center of one dowel to shoulder Example: 3/8” + (3/4”/2) = 3/4

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