Latching magnetic tool changer
-
Very nice work!
I'm thinking to make a system to be able to swap hotends but keep the extruder on the carriage. Or at least, just the motor, and use a quick shaft coupling...
-
@fma Thanks. Yes, your idea would make a lot of sense. I might wait to see what you do, before I re-design mine.
-
Don't hold your breath, as I need to re-design all my CoreXY gantry to be able to implement a tool changer
-
@fma Ha ha - Yeah, I know how it is!!
-
@pawPrinter Have you seen any issues with the magnets causing interference with the stepper motor driving the Bondtech extruder? I want to make a version of a magnetic parking extruder system on a Prusa style machine, but am concerned about the electromagnet interfering with the operation of the stepper motor.
almost an engineer
-
A magnet does not generate electromagnetic interference, as it is a pure static magnetic field.
It can influence a stepper motor in 2 ways:
-
if the stepper and the magnet move relatively of each other (Foucault currents, Faraday effect...). But you need to move them fast to have an effect!
-
if the static field is high enough to reduce/cancel the magnetic field of the stepper. Unless the magnet is very big and touches the stepper, it should not happen.
-
-
As @fma implies, the chances of magnets interfering with stepper drivers is very small. However, strong magnets can prevent brushless fans from working, and even weak magnets can affect a BLTouch.
-
@fma @dc42 Thanks for the info! I'll probably have the Bondtech/Titan in between the electromagnet and the stepper motor just to be safe. I'm planning on using a small M3 screw, spring and printed flag with an optical endstop switch (and homing without the electromagnets on) so there shouldn't be any issues there as might happen with a BLTouch.
-
@red-sand-robot No, I've not noticed any problems with the Bondtech being affected by the magnets (which are permanent magnets in my case, not electromagnets - I found electromagnets a bit heavy).
Interestingly, I have had one occasion when a fan didn't start up properly. I didn't think much of it at the time, because fans can be annoying, but it could have been related to the magnets as @dc42 predicts. -
@pawPrinter Nice work! I'll be inspiration for me. Could you please share your config file?
-
@fma kinda like mmu2 but once the filament is feeded it would go into free mode or another channel
-
@pawPrinter do you have link about the magnets you use ?
and do you think an external counter weight can replace the spring mecanism ?thanks
