Endstops stops working after homing RAMPS 1.4 / ME1.2
Posted by blim
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Endstops stops working after homing RAMPS 1.4 / ME1.2 January 31, 2015 02:55PM |
Registered: 8 years ago Posts: 4 |
Hi,
Just finished designing and building a printer based on ramps 1.4 running on Marlin. End stops are Mech Endstops v1.2 wired with 3 wires. I use end stops in both ends of each axis to prevent crashing if running to far out. The end stops works just fine when i connect to the printer, if I run one of the axis and hit the corresponding end stop the stepper will stop. The same when running a homing cycle, the end stops works just fine.
However AFTER running a homing cycle the end stops doesn't respond anymore if I hit one of the end stops while running a single axis or during a print. Homing still works though. If i reset the printer the end stops works again. Also, when using M119 the status of the end stops display correct any time.
Thankful for any ideas on what I can do to make the end stops work as they should..
Blim
Just finished designing and building a printer based on ramps 1.4 running on Marlin. End stops are Mech Endstops v1.2 wired with 3 wires. I use end stops in both ends of each axis to prevent crashing if running to far out. The end stops works just fine when i connect to the printer, if I run one of the axis and hit the corresponding end stop the stepper will stop. The same when running a homing cycle, the end stops works just fine.
However AFTER running a homing cycle the end stops doesn't respond anymore if I hit one of the end stops while running a single axis or during a print. Homing still works though. If i reset the printer the end stops works again. Also, when using M119 the status of the end stops display correct any time.
Thankful for any ideas on what I can do to make the end stops work as they should..
Blim
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Re: Endstops stops working after homing RAMPS 1.4 / ME1.2 February 01, 2015 05:09AM |
Registered: 10 years ago Posts: 1,592 |
If I was you I would just use 3 endstops - the steppers should not over-run in any situation that I can think of in a properly set-up machine. It just complicates things - in fact, you can run a machine without any end stops though I would prefer to have the 3 in place to make life easier.
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Waitaki 3D Printer
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Waitaki 3D Printer
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Re: Endstops stops working after homing RAMPS 1.4 / ME1.2 February 01, 2015 03:02PM |
Registered: 9 years ago Posts: 14,646 |
Some firmwares (e.g. the RepRapFirmware that I support) include code that prevents you from moving outside the limits of each axis after it has been homed. Does Marlin have that facility? If so, then you will probably have to configure it to know how long your axes are.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
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Re: Endstops stops working after homing RAMPS 1.4 / ME1.2 February 01, 2015 05:20PM |
Registered: 8 years ago Posts: 4 |
Thank you.
I have configured soft limits, and that works for most cases. However if one gets lost steps due to for example crashing into a warped print there should be some hard limits to stop the machine when hitting its end switches. Both Ramps and Marlin support 6 switch setup, so it should work, and I don't see why it doesn't work for me..
I have configured soft limits, and that works for most cases. However if one gets lost steps due to for example crashing into a warped print there should be some hard limits to stop the machine when hitting its end switches. Both Ramps and Marlin support 6 switch setup, so it should work, and I don't see why it doesn't work for me..
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