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### Author Topic: FEED RATE QUERY  (Read 5916 times)

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#### GRAYHIL

• 200
##### Re: FEED RATE QUERY
« Reply #10 on: March 14, 2014, 02:02:52 PM »
The more I learn the harder it gets.
So a circle must have hundreds/thousands of calcultions?.
But I get the principle.

Graham

#### stirling

• 2,188
• UK
##### Re: FEED RATE QUERY
« Reply #11 on: March 15, 2014, 04:11:02 AM »
So a circle must have hundreds/thousands of calcultions?.
To get the feedrate of each axis at any given time? Well it depends on how you command your circle. If it's "hundreds/thousands" of G1 moves then yes but if it's G2/G3 then no.

#### GRAYHIL

• 200
##### Re: FEED RATE QUERY
« Reply #12 on: March 15, 2014, 04:43:34 AM »
I hesitate to ask but how does it do a circle under g2/g3?

Graham

#### stirling

• 2,188
• UK
##### Re: FEED RATE QUERY
« Reply #13 on: March 15, 2014, 05:04:09 AM »
If the circle is made up of straight lines then Mach has no idea it's a circle and plans each individual move just as if it was a "random" sequence of moves. If it's a G1/G2 then by definition Mach knows it has to produce a circle (or part of i.e. arc). In that case the relationship between the X and Y axes is a simple formula that holds for the whole arc/circle. Each axis simply describes  simple harmonic motion where one is a sine and the other a cosine.

#### GRAYHIL

• 200
##### Re: FEED RATE QUERY
« Reply #14 on: March 15, 2014, 02:38:21 PM »
Thanks Rich and Stirling for your explanations.
It helps me to understand the complexity of what goes on when I enter a command into Mach 3.

Graham