Inductive proximity z-probe adapter. Works with glass cover.

by paul_delta, published

Inductive proximity z-probe adapter. Works with glass cover. by paul_delta Dec 12, 2015
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Note: this adapter will work for detachable probes only or as temporary attachment for calibration. You can't just add this adapter to permanently mounted probe that only 2-3 mm higher than nozzle.

My aluminum Kossel bed is not so flat, so I covered it with 3mm glass. Much better, but inductive probe stopped working.

Here is the adapter I made. You will need a #14 0.08" (2mm) nail and very light spring (I used one from this kit http://www.homedepot.com/p/Everbilt-Spring-Assortment-Kit-84-Pack-15642/202045461). Actually, it works even without spring because of the weight of nail/tip. You can replace the spring with thin U-shaped piece of plastic (PET bottle, etc). This modification doesn't affect the sensitivity and precision.

Don't forget to adjust the z-probe height in firmware. I had to make one more :)

How it works: https://www.youtube.com/watch?v=83hY3M8QLtg
Animated probe video: https://www.youtube.com/watch?v=C8dT_2mZWXk

Printed with PLA 180C, 044mm nozzle

  • 0.2mm height
  • 0.5mm manually set width
  • 30 mm/s with slicer cooling enabled
  • better to print together for optimal cooling

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This probe would probably hit the objects being printed?

what software are you using to autolevel in the video? It looks very nice. :)

It's not autolevel, it's just heat map measurement in Repetier Host.

Awesome, do you have the average size of the spring used for this model ?

an a pen-clicker mechanism be somehow incorporated so that at the end of the probe cycle the Z is more aggressively engaged to activate a cam just like the case of the classic and ubiquitous pen. Maybe even a pen can be torn apart and part of it can be rep-strapped into the locking mechanism for calibration.

This is a video of the pen-clicker mechanism:

The cam part could be incorporated in the thin neck, between the activation level of the induction probe and the induction probe itself, an area which is "dead" anyways.

The pin dragging prevention can easily be done with another spring that keeps it at the same level, maybe take the very weak spring of the pen you will sacrifice to take the cam...

Interesting idea, but I think that clicker mechanism will add an additional error affecting the reliability of whole assembly. Every segment of clicker must have equal height and all parts must have zero backlash.

I don't think it will introduce any additional error, because the probe will trigger always before hitting the critical point where the pen-clicker would retract it. So it will basically be a spring-based triggering until the force is high enough to click the mechanism ... everything that happens after this clicker activation YES it's unreliable to measuring but this will happen when the actual measuring is done.

I don't have the skills to design that but I think it should really be tried. No magnets involved and the release doesn't rely upon going somewhere to hook the pin into releasing from the magnet. It's an up/down movement of Z.

Awesome mechanism, but what prevents it from be dragged across the print while printing?

Good question. Actually, my probe has magnetic mount http://www.thingiverse.com/thing:1198256 and detachable, so I don't have this problem. I'll make a note in the description. But it's easy to put it in/out only for occasional calibration.

Kossel magnetic z-probe mount with zero X-Y offset to avoid effector tilt problems/errors. Tested 100%.