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Z axis problem

Posted by paulnd

paulnd

Z axis problem
November 04, 2014 03:16AM

Registered: 10 years ago
Posts: 23

Hello,

I'll be grateful for any assistance with my recently built Mendel90.

I can move the Z axis using the Pronterface controls and G0 without any problems and it also homes correctly. However as soon as the print starts only one of the Z axis motors turns. I've tried adjusting the trim pot on the Ramps 1.4 driver without effect and I'm using a 500W PSU.

Regards

Paul

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nophead

Re: Z axis problem
November 04, 2014 06:02AM

Admin
Registered: 17 years ago
Posts: 7,879

Could be that you have the max speed set higher in the firmware than the jog speed you are using in pronterface. Could also be the 12V rail dropping when the bed is on. Have you got dummy loads attached to 5V and 3.3V rails?

[www.hydraraptor.blogspot.com]

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paulnd

Re: Z axis problem
November 04, 2014 08:02AM

Registered: 10 years ago
Posts: 23

I'll check the max speed when I'm at home tonight but I have tried setting it lower. Load resistors are connected to both rails

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nophead

Re: Z axis problem
November 04, 2014 10:05AM

Admin
Registered: 17 years ago
Posts: 7,879

Also try turning the bed and extruder on in pronterface and see if you can still jog it in both directions.

I can't think of anything else that can be different between jogging it and printing other than speed or power supply load.

Edited 1 time(s). Last edit at 11/04/2014 10:06AM by nophead.

[www.hydraraptor.blogspot.com]

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paulnd

Re: Z axis problem
November 04, 2014 05:12PM

Registered: 10 years ago
Posts: 23

I reduced the feed rate to 3mm/sec which seems to have solved the problem. Thanks for your help.