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Eratic A Axis using MACH3

Graham All Messages By This Member #154663 Inputing G0 or G1 A90 or any number Via the MDI the A Axis drives erratically. It appears to be surging or slowing up/speeding up with stops, all erratic. As the X Y & Z axis work correctly, The Stepper drives are all OK, I have swapped them between Axes and issue always stays with the A . Are there any settings I have missed in MACH3?? Regards Graham
Andy Wander All Messages By This Member #154664 开云体育 Well, there is no, “erratically slow down and speed up” setting in mach3. ? What is your A axis? What kind of motor is on it? Can you swap that motor with one from X or Z? ? Is this a lathe, where A is the spindle? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Graham Sent: Tuesday, March 2, 2021 7:04 PM To: [email protected] Subject: [MachCNC] Eratic A Axis using MACH3 ? Inputing G0 or G1 A90 or any number Via the MDI the A Axis drives erratically. It appears to be surging or slowing up/speeding up with stops, all erratic. As the X Y & Z axis work correctly, The Stepper drives are all OK, I have swapped them between Axes and issue always stays with the A . Are there any settings I have missed in MACH3?? Regards Graham
Tony Smith All Messages By This Member #154665 开云体育 Sounds like something is binding somewhere.? Take it apart and clean it? ? Tony ? ? toggle quoted message Show quoted text From: [email protected] <[email protected]> On Behalf Of Graham Sent: Wednesday, 3 March 2021 11:04 AM To: [email protected] Subject: [MachCNC] Eratic A Axis using MACH3 ? Inputing G0 or G1 A90 or any number Via the MDI the A Axis drives erratically. It appears to be surging or slowing up/speeding up with stops, all erratic. As the X Y & Z axis work correctly, The Stepper drives are all OK, I have swapped them between Axes and issue always stays with the A . Are there any settings I have missed in MACH3?? Regards Graham
Graham All Messages By This Member #154671 Hi Andy, I have 3 axis Dril Mill which has been retrofitted with ballscrews etc.? The 4th axis is a modified universal diiding head. All 4 axes use same model steppers and drives. Using the wireless pendant motion is smooth and good speed. Using the MDI input is when its erratic etc. I have swapped motors, drives and cables and issue is only the A Axis O/P from the B O Box. Just so illogical hence my querry. Regards Graham
Graham All Messages By This Member #154672 Hi Tony, The A Axis is a modified Vertex Universal Dividing Head. Have belt coupled stepper mounted on it. I have disassembled,, cleaned, greased, re assembled Then spent time adjusting?so no backlash and runs smoothly using a wireless pendant.. Its only when driving via the MDI it is erattic ???? Regards Graham
Tony Smith All Messages By This Member #154673 Presumably?you've unplugged X, plugged A in its place and tried that.? And vice-versa of course.? That'd confirm the port on the?BO is ok. MDI speed the same as the pendant?? Trying to run it too fast will do that, missed steps and all that. Tony toggle quoted message Show quoted text On Thu, 4 Mar 2021 at 04:22, Graham <gknox@...> wrote: Hi Andy, I have 3 axis Dril Mill which has been retrofitted with ballscrews etc.? The 4th axis is a modified universal diiding head. All 4 axes use same model steppers and drives. Using the wireless pendant motion is smooth and good speed. Using the MDI input is when its erratic etc. I have swapped motors, drives and cables and issue is only the A Axis O/P from the B O Box. Just so illogical hence my querry. Regards Graham

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