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8/12/2019 Back Extension Bench
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Back Extension Bench
NOTE: The measurements within this text and 2D documentation are given both in
millimeters and inches (in brackets). This website is based on ISO measurement unit system,
which is the international standard. I apologize to the people who use other measurement
units; but I believe that measurements given in millimeters and inches should be adequate foreveryone who would like to build this project.
Besides that, on todays Internet it is easy to purchase the ruler containing all themeasurement units and overcome the difficulties of any kind.
Use various tools and clamps in process of welding, so you could weld the items together
with accuracy.
Make the components as given on drawings.
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Parts List
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2D Documentation
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Frame Components
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Standard Parts
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Assemblage Instruction
1. Weld theCover 60x40 (items 18) to the ends of Rectangular Tubing 60x40x4, Cut Lenght200mm (items 2).
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Chamfer the opposite edges of the Rectangular Tubing 60x40x4, Cut Lenght 200mm (items 2) and
both ends of the Rectangular Tubing 60x40x4, Cut Lenght 820mm (item 3). Weld the Rectangular
Tubing 60x40x4, Cut Lenght 200mm (item 2)and Rectangular Tubing 60x40x4, Cut Lenght
820mm (item 3) together.
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2. Weld theCover 60x40 (item 18) to the Rectangular Tubing 60x40x4, Cut Lenght 700mm(item 1).
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3. Weld the Holder (item 10) to the Leg 1 Rectangular Tubing 50x50x4 (item 11).
4. Weld the Holder (item 10) to the Leg 2 Rectangular Tubing 50x50x4 (item 12).
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5. Weld together the subassemblies made in previous two steps.
6.Weld the Rectangular Tubing 40x40x2,9 Cut Lenght 220,00mm (item 4) to the assembly from
the previous picture.
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7. On the other end of Rectangular Tubing 40x40x2,9 Cut Lenght 220,00mm (item 4) weld theRectangular Tubing 40x40x2,9 Cut Lenght 320,00mm (item 5), but first chamfer the edges that
needs to be weld.
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8. On the other end of Rectangular Tubing 40x40x2,9 Cut Lenght 320,00mm (item 5) weld the
Cover 40x40(item 23).
9. Weld Cover 25,4 (items 22) to the Pipe 25,4x3,2Cut Lenght 300,00mm (item 8).
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10. Weld the subassembly made in the previous step onto the assembly made in step 8.
11. Weld the Sheet Support (item 25) to the assembly made in the previous step.
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12. Weld the Cover 40x40 HOLE(items 13) to theRectangular Tubing 40x40x2,9 Cut Lenght
400,00mm (item 17).
13. Pull the Pipe 25,4x3,2 Cut Lenght 610,00mm (item 7) through the holes on subassembly madein the previous step and weld it.
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15. Weld the Pipe 25,4x3,2 (item 9) to the subassebly made in the previous step.
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16. Weld the Pipe 25,4x3,2 Cut Lenght 150,00mm (item 6) to the subassembly made in the previous
step.
17. Weld the Cover 25,4 (items 22) to the subassembly made in the previous step.
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18. Weld the Rectangular Tubing 40x40x2,9 Cut Lenght 480,00mm (items 16) to the
subassembly made in the previous step.
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19. Fasten the Wooden Plate (item 15) to the subassembly made in the previous step using
fasteners: Slotted Pan Head Screw M6x30 (item 26), Spring Lock Washer 6 (item 27) and
Heaxagon Nut M6 (item 28)
20. Fasten the subassemblies made in step 1 and 2 to the subassembly made in step 5 using fasteners:
Hexagon Head Bolt M8x80 (item 19), Spring Lock Washer A-8 (item 20)andHexagon Nut M8
(item 21).
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21. Fasten the subassembly made in step 19 to the assembly made in the previous step using
Pin8h11x60 (item 24).