Blue Screen of death in middle of run…

I had sliced up some prototype anti-backlash nuts, and started them on a long run. When I came in, the FDM was stopped. Turning on the monitor of the sending computer I found:

Blue Screen of Death
Blue Screen of Death

At least it was early in the run, so not much material was lost:

Front View
Front View
Left View
Left View

The support in the small round spring pockets was digging in to the  Y- side of the pocket instead of being centered. I used the SSCAL batch program to send a correction to the FDM 1650.  I sliced up the two parts and sent to the FDM, rather than doing a whole trayfull.

Front View
Front View
Left View
Left View

The support was still way off center in Y to the model material.

Off Center Support
Off Center Support

Figuring I moved the wrong way with the SSCAL batch file, I did an opposite move of twice the value, and ran two more parts.

I didn’t have time last night to take photos of the results, but a quick look showed the support had moved even farther off center than the first batch!

I wonder if the SSCAL batch file is stripping the minus sign (-) from the value being passed to the FDM?

—-John

4 thoughts on “Blue Screen of death in middle of run…”

  1. sscal isn’t stripping the minus – it’s working exactly as it should! sscal moves the _support_ tip offset, not the model tip – remember when you run a calbox, it’s actually depositing HIPS on top of the ABS, reverse of what a modeling operation is.

    1. Well, wait, I take that back – if you doubled the correction amount and put it in as a negative the second time, you certainly should have seen it come back the other way… Now I’m really confused…

      Are you using sscal with the ‘-a’ flag (append value, i.e. relative adjustment), or without the flag (absolute positioning)? I think I may start adjusting mine with absolute coordinates rather than trying to determine if my relative adjustments have been working…

      1. Yes I used -a option will SSCAL….

        I’m going to peek at values using Insight, then try SSCAL again, and then see what Insight says the values are (when I get a chance).

        —-John

      2. I tried using the Insight Calibration Dialog box again today. I was able to send a number for Y to the FDM & read it back from the control.

        Then I realized this was probably in MM units, and that’s how come I didn’t really see any change when I would send 0.03 — or 0.0012 Inches.

        I sent 2.0 to the FDM (maybe too much) and the support definately moved! The parts will be done tonight, so if I have a chance, I’ll get in a check them in the morning.

        —-John

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