What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 03:12AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 04:59AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 06:38AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 07:03AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 07:38AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 09:05AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 05, 2016 10:07AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 06, 2016 04:58PM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 06:21AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 09:49AM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 09:55AM |
Registered: 8 years ago Posts: 776 |
if you are using RepRapFirmware, you do not need to do any coding, nor will you ever need to recompile the firmware. you can write it entirely as g-code. replace homeall.g, homex.g, homey.g and homez.g - very very straightforward.Quote
realthor
The third option is software-only and it'll have to be implemented in firmware so there is not much we can do (other than coding).
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 12:16PM |
Registered: 9 years ago Posts: 1,035 |
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dc42
In a Cartesian or CoreXY printer, you don't need the X and Y endstop switches to be highly repeatable - unless you plan to implement pause/power down/power up/restart functionality, or something similar that means you need to home the X and Y axes in the middle of a print. So it really doesn't matter what sort of switch you use. The Z axis is a different matter.
A head-mounted Z probe can be used to home the Z axis, and can also be used for bed level compensation if desired (and possibly for homing the other axes too).
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 03:37PM |
Registered: 10 years ago Posts: 14,672 |
Quote
realthor
Most people want to have some sort of bed leveling probe and if that's one thing that will be there then not using it to home all axes seems like a waste. But again, most people look for an Induction probe which makes the X carriage quite heavy so if that can be made detachable and used for all axes homing then for less than 10moneys one could solve all wire moving issues and the bad looks of microswitches/etc hung all over the printer.
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 07, 2016 04:04PM |
Registered: 9 years ago Posts: 1,035 |
Anonymous User
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 02:41PM |
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 05:03PM |
Registered: 11 years ago Posts: 5,780 |
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 05:08PM |
Registered: 9 years ago Posts: 1,035 |
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the_digital_dentist
If you really want to keep the extruder carriage light, build the machine so the bed stays level. Then you won't need a leveling probe, the wiring, the firmware options, or the debugging time you are going to have to spend on getting it to work.
I think speed is grossly over-rated. I have seen a lot of videos of machines printing really fast, but I have never seen a really high quality print that was printed really fast. We build 3D printers because we want to make stuff that might otherwise be a PITA to make. After I print something that has taken a while, I sometimes think about how I would have made the object if I didn't use a 3D printer, and how long that would have taken. Then I think it's OK that the printer took 14 hours to make something that I could not have made otherwise in less than a month or not at all. A 3D printer will work for many hours without a break, even while you sleep, and will produce a very high quality output, if you give it time to do its job. If you print so much and you're in such a rush to start the next print that you have to accept poor print quality, maybe you need a second printer.
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 05:30PM |
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Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 10:34PM |
Registered: 9 years ago Posts: 1,035 |
Quote
dc42
Even if you don't need to do bed levelling because your bed is flat and the gantry rigid enough not to sag by more than 0.05mm as the head moves, a Z probe is still useful to establish the Z=0 point just before starting the print.
Making the probe removable adds more complication, and IMO is pointless when the on-carriage probe weighs only 2g.
Anonymous User
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 10, 2016 10:57PM |
Quote
dc42
Even if you don't need to do bed levelling because your bed is flat and the gantry rigid enough not to sag by more than 0.05mm as the head moves, a Z probe is still useful to establish the Z=0 point just before starting the print.
Making the probe removable adds more complication, and IMO is pointless when the on-carriage probe weighs only 2g.
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 01:06AM |
Registered: 9 years ago Posts: 1,035 |
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MKSA
And the simplest, accurate, no messing around, light, immune to normal t° change, magnetic field ... is to have a leaf switch NC. Same principle as probe used on machine tools.
As they are quite expensive, I made one using berylium copper gold plated Berg connectors. Just for my Z axis indeed..
Anonymous User
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 05:38AM |
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 06:13AM |
Registered: 9 years ago Posts: 1,035 |
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 06:33AM |
Registered: 9 years ago Posts: 1,035 |
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MKSA
As for a removable probe, the best, would be try to make one. It is a good occasion to learn what a micron really is, how to design, make accurate mechanical parts, etc.... Of course, the conclusion would be, not useful here but the skills gained are worth it.
Anonymous User
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 10:09AM |
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realthor
Quote
MKSA
As for a removable probe, the best, would be try to make one. It is a good occasion to learn what a micron really is, how to design, make accurate mechanical parts, etc.... Of course, the conclusion would be, not useful here but the skills gained are worth it.
I have designed one that doesn't have the issues you are telling about. I've been posted about it here: [forums.reprap.org]
It's a derivative of the direct nozzle-to-metal-bed approach but works also for non-metal beds as the wiring is all contained in itself. It has been designed to be detachable and it really doesn't care if the printhead catches it at the right micron in height ... all that is accommodated by the ribbon between the nozzle and the bed (ideally a feller gauge "leaf").
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 10:30AM |
Registered: 9 years ago Posts: 1,035 |
Anonymous User
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 02:24PM |
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realthor
Well, I don't understand all you say so I can't imagine just by reading. And from the pictures I couldn't tell.
About my probe: I have printed it but haven't tested it on a printer. It's pretty simple actually and providing the nozzle is clean it should be repeatable. I haven't used it as I haven't yet designed a proper snapping mechanism (a way for the printhead to take it from a parked position). I could use magnets but I avoid it. It could easily be used by Deltas, actually those have a lot of room to park toolheads compared to a corexy. But I have left it aside for a while, being caught in other projects.
I designed it as a reprap option, not to replace the expensive or even the cheap yet still vitamins ones.
It works in an NO circuit so I have to find a way to make it normally closed. I don't have studies in electronics so it has been slow for me until I had to put it aside for another time.
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 11, 2016 11:01PM |
Registered: 9 years ago Posts: 1,035 |
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 12, 2016 03:44AM |
Registered: 8 years ago Posts: 622 |
Quote
dc42
Even if you don't need to do bed levelling because your bed is flat and the gantry rigid enough not to sag by more than 0.05mm as the head moves, a Z probe is still useful to establish the Z=0 point just before starting the print.
Making the probe removable adds more complication, and IMO is pointless when the on-carriage probe weighs only 2g.
Re: What's the best placement of EndStops in a CoreXY and are mechanical ones still used by you guys? May 13, 2016 02:25AM |
Registered: 9 years ago Posts: 1,035 |