Chopper Frame Guide

Chopper Frame Advantage Summary
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This is how normal drawings are created from a front, side and top view.

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In the event there is a complex part with odd angles and surfaces, it is recommended to create sectional or additional views since all of the angles are not easily visible from just the 3 views.

Step 12 and 13 illustrate how an additional view was created looking at the angled plane. This helps to show how the other faces are in comparison to this specific face.

Here is a generic frame lower rail component.

The angles are shown for each bend. Keep in mind that the bends are in different planes.

135 Degrees
Side View
135 Degrees (not visible from this view.)

Hidden bend
Side View
Top View
With these views the drawings pull “projected dimensions & angles.” these dims/angles do not give the actual value, but a “projected” value. Also the front view does not even show that there is a secondary bend there. For Example, in the cube below, we know that all of the angles are 90 degrees, but visually it looks much smaller at the corner shown. This is because we are looking at the cube from an angle. Similarly, when looking at a complex tube like the one above, the angles we need in order to manufacture the tube are not easily pulled from these simple views.

This is the same 36” tube with a view from a different angle. When we pull “projected” dimensions, then the same 36” tube will measure much smaller than the actual 36”. This is why multiple views with dimensions are needed in order to calculate the length of the tube when there is a complex bend. This requires use of the Pythagorean Theorem and trigonometry to calculate the lengths and angles. All of these complications can be avoided if we use sectional views and look directly at each section of the tube on it’s “bending” plane. The angle of bend is exact, and the lengths of tubes that make that bend are exact.
Prospective can be Deceiving in 2 Dimensional Views.

View Plane
120 Deg
B
120 Deg
135 Deg bend
135 Deg bend
A sectional view pretty much takes a look at the tube from a specific plane. In this case, I’ve chosen the plane shown above. The arrows show the direction that we are looking from. Looking at this tube from this angle makes it easy for the customer because they can pull dimensions and angles directly instead of having to calculate them. This gives perfectly correct angles and tube dimensions since we are looking at it from a plane that is parallel to the tube and bend.

A
120 Deg
135 Deg bend
Also the tube lengths can easily be pulled from these views. Without this view the tube length shown as “A” would have to be calculated using dimensions from both the top view and the side views. (Slide 9 shows how perspective can affect length of tube.)
Please review the frame drawings and you can see how helpful the sectional views really are.

Thank You!
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Chopper Frame Guide

by Custom Choppers Guide on Oct 05, 2011

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Chopper Frame Guide — Presentation Transcript