In most workplaces where CAD is used, the task of drafting is
simplified by employing readily accessible, accurate drafted
drawings of components.
Component drawings are put together to make assembly drawings
of complete, useful items.
The IHPVA will hold or simplify access to 2D and 3D files of
common HPV / Bike components. This CAD library would greatly
simplify the task of designing bikes.
Draft Guidelines for CAD Library Drawings:
Drawings to be in DXF R14 format
Drawings to be drawn to a scale of 1 drawing unit = 1 mm
Have a maximum of 2 layers on any drawings, 1 layer for
dimensions and one for the objects.
Dimension in mm and leave dimensions as single, unexploded
entities.
Keep dimensions to an absolute minimum and only show important
sizes. ie for wheel, OD and are axle width could be included.
Drawing filenames should start with 2d or 3d depending on the
content of the drawing.
Origin point of the drawing should be logical and "on the
centreline of the bike" wherever possible, ie for
wheels,handlebars, seats, seatposts.
Manufacturers are welcome to submit links to their own
libraries of component drawings.
Drawings should not reveal commercially sensitive details of a
specific manufacturer's components.
Drawings may be of bike components or of complete components
which form the basis of an HPV conversion, ie Raleigh 20, mixte
frame ladies bike.
The Webmaster wishes to acknowledge Steve
Nurse who proposed these guidelines, comments can be directed
to the Webmaster.
A useful tool which can be used in conjunction with our
library is this collection of java applets that can generate DXF
files of a variety of bicycle configurations including short
wheelbase recumbents. Brent Curry's CAD software is located at
http://www.bikeforest.com/CAD
