Camshaft design And Analysis Programs

For more than three decades, computerized cam program development at Andrews Products has been a continuous effort. Programs originally written for DOS based computers have been converted to operate on Windows PC operating systems including XP, Vista, Win 7, Win 8 and more recently, Windows 10.

Andrews cam programs use an interactive, intuitive graphical interface which makes it easy for beginning or experienced users to rapidly design quality cam lobes or analyze previously generated cam lift data for different characteristics and applications. Cam designs made with Andrews cam programs work, period!
Five programs are available for specific design applications; some features are common to all programs:
1.        Works with inch or metric data - switchable with one mouse click
2.        Cam design screen graphs can be printed on any Windows PC printer
3.        Cam design files can be saved as PDFs for efficient file printing and emailing
4.        Input data for completed cam designs can be saved for future reference and recall
5.        Direct graphical comparison of two different cam lift curves becomes an easy task
6.        Personal tutorial assistance is available by way of remote connection to your computer
7.        The number of cam designs saved is limited only by computer disc memory space
8.        Cam design program output includes open and close side lift data in text format
9.        Option to generate variable headstock work speeds for CNC cam machines
10.      Another option - generate master data for rocking table camshaft grinders
11.      For tutorial purposes, sample cam designs are included with programs
12.      Demonstration versions of cam programs are available for no cost
The following summary outlines the purpose and differences in various Andrews cam programs:


General purpose cam program for engines with translating roller or flat followers. Cam designs can be created with different open and close ramps: constant velocity, constant jerk, uniformly accelerated ramps or no ramps (main events only). This is a p, q, r, s polynomial curve fit program that requires a Windows based PC to manage arithmetic calculations and screen graphics.  


The primary use for this program is to generate cam lobe designs that do not have inverse flanks (also known as negative radii of curvature cams). Different ramp designs are also possible with this program. Finished designs with D45camW include 8 segments and usually take less than 20 minutes from start to finish (for a knowledgeable user).


For engines using oscillating arm rockers (finger followers), program starts with valve motion and then  calculates complete 360 degree cam lobe data files. Program operates with left or right rocker arm pivots and clockwise or counterclockwise cam rotation-(eight possibilities).


 Analysis program that imports lift data and displays graphical outputs of lift, velocity, acceleration, jerk and radius of curvature. Program can add (or reduce) maximum lift and add (or reduce) event duration (in one degree amounts). Comparing two different lift curves on one screen is.possible. Program imports open data, close data, base circle size, follower size, then calculates velocity, acceleration, jerk and radii of curvature for all 360 degrees. This is a universal cam analysis program that can also calculate cam lobe stress (PSI) and theoretical valve gear separation RPM (valve float) based on known valve gear mass and spring data.


Similar to D4camW with the added feature of being able to reduce maximum cam flank velocity so aggressive cam designs will work without the cam contact diameter exceeding the diameter of the follower. This is a program that is limited specifically to engines with flat followers so the new designed lobe “fits” on a smaller sized lifter.
Cam4arc Program designs cam lobes with 4 circular arcs and can create both mild and very aggressive lobes. Dwell at max lift can be utilized so lobes will have a “squared” appearance. Program is intended for engines with flat or roller lifters. Output includes open and close lift files in txt format.