Old School Chopper Frame Fabrication - Knucklebuster

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Figure 3 In Figure 3 however we have tilted the down tube over into its actual position and we'll note that the black marker line is rotated inward towards the right and that the uppermost surface of the lower rail, indicated by the red marker line is about one quarter of an inch away. That red marker line represents the control line we need to use in the bender when we make the last rearward bend in the rail. In other words the last bend will be pointing straight up relative to the lower rail and not in line with, or in the same plane, as the down tube. This last statement bring us to the subject of learning how to find up, down and sideways on round tubing. This is the question I am asked most often and my standard reply is to buy a good book on pipe-fitting because there you will find literally hundreds of handy methods of dealing with angles on cylindrical structural members and round pipe or tubing. You'll also learn how to use a few special tools designed just for pipe and tubing work but the tool used most often is the little nine inch magnetic torpedo level. The key to successful tubing work is to be sure that all of your horizontal tube runs and the base plate, jig or frame table, and your bender, are absolutely level in all directions. You cannot work with tubing unless you have total confidence in the levelness of your horizontals. In the same vein all of the vertical members should be plumb. For instance the seat post even though it slants to the rear of the frame should be plumb left to right, at a perfect ninety degree angle to the frame cross members. If everything is level and plumb you can find virtually any angle, distance, offset, or measured point anywhere on the frame just by using a level and a measuring tape. One of the handiest books to have on hand is the "Pipe Trades Pocket Manual" by Thomas W. Frankland. This little book explains in lay terms how to do anything including how to find angles by using your wrist watch just in case you've lost your
angle finder. It explains is easy to understand terms how to calculate arc lengths, offset bends and how to cut miters just to highlight a few points. It's also loaded with dozens of handy charts, graphs and tables including all of the trig functions. Even without such reference guides it's pretty easy to navigate around frame tubing. Figure 4 You can use a simple combination square with a built-in level bubble to find the top center point and side centers ninety degrees opposite top center on a tube. If you locate these points at two different places on a tube run you can scribe control lines between them using a straightedge. It's almost as easy as working with square or rectangular tubing once you get the hang of it.
Page 1 and 2: Old School Chopper Frame Fabricatio
Page 3 and 4: 1. Steering head. Also called the s
Page 5 and 6: Figure Error! Bookmark not defined.
Page 11 and 12: Figure 11 This cross member sets th
Page 15 and 16: Figure 15 Figure 15 shows the end r
Page 17 and 18: Figure 17 There is a corresponding
Page 19 and 20: Figure 19 I call this area of the f
Page 21 and 22: Figure 23 The slope angle of the 'r
Page 23 and 24: In Figure 3 we can see the two tube
Page 25 and 26: Figure 1 shows the basic components
Page 27 and 28: an eighth of an inch clearance betw
Page 29 and 30: Figure 6 In Figure 6 we've deepened
Page 31: Figure 2 if you look closely you ca
Page 35 and 36: Figure 6 In this shot I've propped-
Page 37 and 38: In case you're interested I messed
Page 39 and 40: Figure 3 Figure 3 depicts a plate t
Page 41 and 42: Figure 7 Figure 7 is another 'boxed
Page 43 and 44: Regardless of the style or type of
Page 45 and 46: Figure 13 At this point all you nee
Page 47 and 48: Figure 1 You'll no doubt realize th
Page 49 and 50: Figure 4 Actually the plate will be
Page 51 and 52: If you're building a frame without
Page 53 and 54: Figure 5 Now that the plates are in
Page 55 and 56: Figure 2 Clean the notch up slightl
Page 57 and 58: Figure 5 The frame in Figure 5 is o
Page 59 and 60: Figure 7 The tube in Figure 7 above
Page 62 and 63: We'll now begin doing the detail wo
Page 64 and 65: The charge has been removed from th
Page 66 and 67: Some people have reported problems
Page 68 and 69: Steering Necks For some unexplained
Page 70: Figure Error! Bookmark not defined.

Old School Chopper Frame Fabrication - Knucklebuster

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