G Code Generation

More
08 Oct 2012 14:05 #25126 by diegoroman17
Replied by diegoroman17 on topic Re:G Code Generation
Ok.

There is a possibility of bug in the examples of Section 1.4. The theory says that A is half of the maximum acceleration but the examples used without dividing the maximum acceleration for two

Please Log in or Create an account to join the conversation.

More
08 Oct 2012 17:05 #25131 by BigJohnT
Replied by BigJohnT on topic Re:G Code Generation

To keep up the feed rate, the move must be longer than the distance it takes to accelerate from 0 to the desired feed rate and then stop again. Using A as 1/2 the ini file MAX_ACCELERATION and F as the feed rate in units per second, the acceleration time is ta = F/A and the acceleration distance is da = F*ta/2. The deceleration time and distance are the same, making the critical distance d = da + dd = 2 * da = F2/A.

For example, for a feed rate of 1 inch per second and an acceleration of 10 inches/sec2, the critical distance is 12/10 = 1/10 = 0.1 inches.

For a feed rate of 0.5 inch per second, the critical distance is 52/100 = 25/10 = 0.025 inches.


So your saying the two examples from the manual I quoted above are wrong? What should the correct example be?

John

Please Log in or Create an account to join the conversation.

More
08 Oct 2012 17:17 #25133 by diegoroman17
Replied by diegoroman17 on topic Re:G Code Generation
If A = (1/2)*MAX_ACCELERATION in the example 1:

F = 1 inch/sec
MAX_ACCELERATION = 10inches/sec2 then A = (1/2)*10

critical distance = F^2/A
critical distance = 1^2/ ((1/2)*10) = 0,2 inches

Please Log in or Create an account to join the conversation.

Time to create page: 0.106 seconds
Powered by Kunena Forum