Raghav Posted June 15, 2022 Share Posted June 15, 2022 Dear All, I'm working on a three axes system with two vector feedrate linear axes (X&Z) and one rotary C axis. I would like to know how to set the three axes to move synchronised based on a given feedrate? Currently if running C-axis alone, provides a max feedrate of 1 motor unit/ min. Can anyone suggest the best practice to assign and synchronize axes motion? Thank you. Quote Link to comment Share on other sites More sharing options...
David White Posted June 15, 2022 Share Posted June 15, 2022 Not 100% sure of your application, but I guess you’re machining or engraving on the surface of a cylinder??? The cylinder has a circumference, so you could scale the rotating axis units to match the circumference. For arguments say your linear axes have 1000 counts per unit (mm for arguments sake) and your cylinder is 100 mm diameter, then it’s circumference is 100 x Pi = 314.159mm If your motor moves it 1 rotation in 100000 counts then you would scale the C axis as 100000/314.159 = 318.31 counts per mm at that diameter So #1->1000X #2->1000Z #3->318.31C Then you can use FRAX(C,X,Z) and any motion program move will be able to use F1000 etc. to specify the feed rate in any combination of those axes. It gets a lot more tricky if you are dynamically moving at varying distances from the center of your C axis. Quote Link to comment Share on other sites More sharing options...
Raghav Posted June 19, 2022 Author Share Posted June 19, 2022 Hi David, Thank you for the advice. FRAX(C,X,Z) works fine. Now I'm facing issue with the C feedrate. I would like to provide a Ffeedrate F72000 corresponding to 200 RPM, but the C feedrate is struck at 54000... Seems the problem is due to some settings with Segmove or lookahead. Any advice on the same? Quote Link to comment Share on other sites More sharing options...
sdefisher Posted June 22, 2022 Share Posted June 22, 2022 On 6/19/2022 at 6:48 AM, Raghav said: Hi David, Thank you for the advice. FRAX(C,X,Z) works fine. Now I'm facing issue with the C feedrate. I would like to provide a Ffeedrate F72000 corresponding to 200 RPM, but the C feedrate is struck at 54000... Seems the problem is due to some settings with Segmove or lookahead. Any advice on the same? With frax on it will use the X and Z moves to calculate the feedrate for the C-Axis as well. So if X/Z were not moving you would get 200 RPM. Quote Link to comment Share on other sites More sharing options...
Eric Hotchkiss Posted June 23, 2022 Share Posted June 23, 2022 How do you want the speed of the rotary axis (C) decided? Should it be running at a constant speed? Should it slow down to maintain a constant overall speed when X and Z speed up? How do you want the speed of X and Z to decided? Should they follow along to draw on a rotating cylinder? Should they maintain a fixed combined feedrate (ignoring C)? Quote Link to comment Share on other sites More sharing options...
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