Reed switch endstops. Anybody else using them?
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@monster The motor leads should be twisted (two twisted pairs- one for each coil) as should the endstop leads. That helps prevent inductive coupling.
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@monster said in Reed switch endstops. Anybody else using them?:
Could there be an induction from motor wires?
With normally-open endstop switches, capacitive (not inductive) coupling from stepper motors wires to endstop wires can cause false triggering. That's one of the reasons that normally-closed switches are preferred. If using normally-open switches, use shielded cable for the endstops.
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Thank you for you answers!
I just came back to report that separating the wires did the trick! All good now!
And was enjoying (like a kid I was running X and Y motors for like half an hour) how calm this motors are now! Unbelievable!!! This board worth every penny!!!
I'll have to rewire (with twisting) everything - wish I know this trick right away - it would affect choice of parts.
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@monster said in Reed switch endstops. Anybody else using them?:
I'll have to rewire (with twisting) everything - wish I know this trick right away
Twisted pair wiring is good for stepper motors (one pair per phase), for thermocouple wires, and for normally-closed endstop wires. For normally-open endstops, shielded cable is better; mono audio cable is OK if you use the shield for the ground connection.
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It's a good idea to twist bed and hot-end heater wires, and it doesn't hurt to twist fan leads, too. I use an electric drill with a simple tool I designed and printed.
@dc42 Good call on the capacitive coupling with NO endstops. Noted....
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Hi All,
I have unfortunately lost the magnet for the z axis reed sensor! I am struggling to find a replacement.... does anyone have a part number or a link please?Thanks
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@TP Just about any magnet will do. If you have some earphones from an old cell phone laying around you can pull a small neodymium magnet out of one earpiece.
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@mrehorstdmd Thank you!! i don't suppose anyone has a parts list ?
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@TP said in Reed switch endstops. Anybody else using them?:
@mrehorstdmd Thank you!! i don't suppose anyone has a parts list ?
If these guys don't have it it likely doesn't exist.
Frederick
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@TP The ones I used were linked above.
https://www.conrad.nl/p/standexmeder-electronics-4003004010-permanente-magneet-staaf-alnico-grenstemperatuur-max-400-c-1205896A year and a half later and everything is still working perfectly, Repeatability is obviously excellent since the machine always holds calibration perfectly; often for weeks across dozens of homing and print cycles after a single calibration on duet powerup.
