Thursday, January 15, 2009
Since I already mentioned this in a forum reply to Wade; I though I would blog on it here so people could comment directly.
My suggestion would be to add a inexpensive presure sensor to the Z mount to allow the following functionality:
- Measure upwards pressure from a calibration touch down or abort if it had run into the bed. It could also be used for a calibration cycle where you touch down on the four corners of the bed or the maximum build area to check for alignment or height of Z (which in IMHO is the measurement that can be the most variable measurement).
- Measuring contact force for a stencil cutting blade or drawing pen to get more uses out of the bot. As a stencil cutter it could cut logos, labels, paper or PCB exposure or silk screen masks.
Since it is variable resistance it could interface to one of the analog ports for the Sanguino in place of the second extruder which no one has really done yet. Though I am reading between the lines and thinking that the extruders are going to be slave boards now.
Though if you still wanted to have a directly connected second extruder you could do away with the separate Z-enable pin (tie it to X & Y enable for a generic stepper motor/movement enable pin) and then devote that pin to Z contact pressure.
You know that’s a problem with this forum, everyone has ideas that you have to chip in with before you do a show and tell of something new LOL!
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