Z axis homing issue, but ONLY at the start of a print job May 12, 2014 05:16AM |
Registered: 9 years ago Posts: 10 |
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 07:47AM |
Registered: 14 years ago Posts: 1,092 |
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 08:38AM |
Registered: 9 years ago Posts: 10 |
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 09:44AM |
Registered: 10 years ago Posts: 869 |
It doesn't matter what others have. They may have different steppers. Or their steppers current is slightly different than yours which makes comparing values pointless. What matters is what YOUR hardware can handle.Quote
netmav
Anyone else with a RepRap Prusa i2 and RAMPS1.4? What max Z-speed have you got on yours?
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 12:48PM |
Registered: 9 years ago Posts: 10 |
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 01:56PM |
Registered: 10 years ago Posts: 869 |
That sounds correct. It will "bounce" on purpose. The initial descent (I'm presuming you have the switch at z-min) is a rapid descent, it raises slightly, then descends down again more slowly until the switch is triggered. The initiail faster descent is to save time, the slower speed is for positional accuracy so that the switch is tripped at exactly the right point and not overshoot it.Quote
netmav
During homing at the beginning of the print process, after the Z endstop is egaged, the Z axis moves back up about 5-7mm (instead of moving a small amount up, and then slowly moving down to the Z 0.00 possision??
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 02:45PM |
Registered: 9 years ago Posts: 10 |
Quote
cdru
That sounds correct. It will "bounce" on purpose. The initial descent (I'm presuming you have the switch at z-min) is a rapid descent, it raises slightly, then descends down again more slowly until the switch is triggered. The initiail faster descent is to save time, the slower speed is for positional accuracy so that the switch is tripped at exactly the right point and not overshoot it.
Re: Z axis homing issue, but ONLY at the start of a print job May 12, 2014 04:35PM |
Registered: 10 years ago Posts: 869 |
Re: Z axis homing issue, but ONLY at the start of a print job May 13, 2014 02:51AM |
Registered: 9 years ago Posts: 10 |
Quote
cdru
What does the gcode at the start of your print job look like? Look for the line in particular that has G28 in it.
Re: Z axis homing issue, but ONLY at the start of a print job May 13, 2014 08:27AM |
Registered: 10 years ago Posts: 869 |