add_tube_extension: Add extension to top of the head or seat tube

In ghuiber/bicycle: Design a bicycle frame

Description

The frame reach is the difference between the x coordinate of the top of the head tube and the x coordinate of the bottom bracket. This is measured at the true top of the head tube, which is somewhere above the point where the top tube and the head tube meet. The true length of the head tube is a derived dimension, but the distance between the top of the head tube and the point where the top tube and the head tube meet, set here as t_extension, can be an arbitrary input if you have a welded frame. In a lugged frame the top of the head tube is the same as the top of the HT-TT lug ring.

Usage

add_tube_extension(frame_dims, tube = "ht_triangle", t_extension = 20)

Arguments

frame_dims	A tibble with frame dimensions from the front and rear triangle, returned by wrap_frame_dims().
tube	The name of the tube to be extended: ht_triangle for the head tube or st_triangle for the seat tube.
t_extension	The length of the tube extension in millimeters

Details

The same goes for the top of the seat tube extension. It too is arbitrary for a welded frame, and the trigonometric calculations for deriving its vertical and horizontal projections are identical to those of the head tube extension so we might as well use the same function for getting at them.

Value

A tibble.

See Also

get_front_triangle_dims()

ghuiber/bicycle documentation built on Dec. 20, 2021, 10:46 a.m.