1 SHEET METAL THEORY II Hand Tools and Machinery

2 TYPES OF TOOLS USED IN SHEET METAL FABRICATION –Sheet metal cutters ( reds, Greens, Bulldogs) –Sheet metal notcher –Sheet metal scratch awl MACHINERY USED IN DUCT FABRICATION –Sheet metal breaks –Pittsburgh machines TYPES OF TOOLS USED IN SHEET METAL FABRICATION –Sheet metal cutters ( reds, Greens, Bulldogs) –Sheet metal notcher –Sheet metal scratch awl MACHINERY USED IN DUCT FABRICATION –Sheet metal breaks –Pittsburgh machines

3 HAND TOOLS LEFT SNIPS –GREEN IN COLOR –FOR CUTTING CCW RIGHT SNIPS –RED IN COLOR –FOR CUTTING CW HANDLE OR BULLDOG SNIPS – LARGE STRAIGHT SNIPS LEFT SNIPS –GREEN IN COLOR –FOR CUTTING CCW RIGHT SNIPS –RED IN COLOR –FOR CUTTING CW HANDLE OR BULLDOG SNIPS – LARGE STRAIGHT SNIPS

4 SNAP LOCK PUNCH –FOR JOINING SHEET METAL NOTCHER 30° “V” SHAPE NOTCH AT CORNER OF DUCT SCRATCH AWL – MARKING DUCT ON LAYOUT TABLE –TRACING METAL TEMPLATES SNAP LOCK PUNCH –FOR JOINING SHEET METAL NOTCHER 30° “V” SHAPE NOTCH AT CORNER OF DUCT SCRATCH AWL – MARKING DUCT ON LAYOUT TABLE –TRACING METAL TEMPLATES

5 SHEET METAL MACHINERY PITTSBURGH ROLL FORMER – USED FOR JOINING DUCT, ALLOWS DUCT TO BE PERMANATLY CONNECTED – AVG COST FT. BREAK –USED FOR BENDING – MANUAL OR MOTORIZED PITTSBURGH ROLL FORMER – USED FOR JOINING DUCT, ALLOWS DUCT TO BE PERMANATLY CONNECTED – AVG COST FT. BREAK –USED FOR BENDING – MANUAL OR MOTORIZED

6 4 FT BREAK OR BOX BREAK –FOR END CAPS AND REGISTERS DUCT SLITTER – USED TO CUT SHEETS STEP SHEAR – USED TO CUT METAL – USES A FOOT PETAL TO OPERATE BLADE SPOT WELDER –120 VAC –USED TO JOIN LIGHT WEIGHT METAL 4 FT BREAK OR BOX BREAK –FOR END CAPS AND REGISTERS DUCT SLITTER – USED TO CUT SHEETS STEP SHEAR – USED TO CUT METAL – USES A FOOT PETAL TO OPERATE BLADE SPOT WELDER –120 VAC –USED TO JOIN LIGHT WEIGHT METAL

7 SHOP SAFETY IT IS ALL DANGEROUS – NO LONG HAIR –WEAR GLOVES – LONG SLEEVE SHIRTS MUST BE BUTTONED DOWN –NO LOOSE FITTING CLOTHES OR JEWELRY ALWAYS WATCH FINGERS WHEN DEALING WITH SHEET METAL. –YOU WILL BE DEALING WITH SHARP OBJECTS. IT IS ALL DANGEROUS – NO LONG HAIR –WEAR GLOVES – LONG SLEEVE SHIRTS MUST BE BUTTONED DOWN –NO LOOSE FITTING CLOTHES OR JEWELRY ALWAYS WATCH FINGERS WHEN DEALING WITH SHEET METAL. –YOU WILL BE DEALING WITH SHARP OBJECTS.

8 SHEET METAL SIZING AND USES MEASURED IN GAUGE TYPICAL SIZE RANGE 30 GAUGE DOWN TO 16 GAUGE THE HIGHER THE NUMBER THE THINNER THE METAL THICKNESS GUIDELINES –28-SMALLER DUCTS –30- THINNEST NORMALLY USED MEASURED IN GAUGE TYPICAL SIZE RANGE 30 GAUGE DOWN TO 16 GAUGE THE HIGHER THE NUMBER THE THINNER THE METAL THICKNESS GUIDELINES –28-SMALLER DUCTS –30- THINNEST NORMALLY USED

9 26- MOST COMMONLY USED – 24- FOR LARGER PLENUMS –22 AND 18 : WELDED DUCT ROOF CURBS EXHAUST DUCT 26- MOST COMMONLY USED – 24- FOR LARGER PLENUMS –22 AND 18 : WELDED DUCT ROOF CURBS EXHAUST DUCT