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MegaWelder: Automatic Welding Works! (90% - simple surfaces only)

Small Ship 16x Welder
Just timers and sensors, no programmable block (feel free to update - and send me the code, please).

How it works:
1) Goes forward (yelloy button) or backward (blue button), @ end of surface step Left and reverse movement automatically.
2) Automatic stops alter all done.

Features:
Automatic welding works in simple plain surfaces.

How to use automatic welders:
1)press the red button
2)set position @ the corner (see figure): do not touch de surface and remember: at end will go left before reverse!
3)press the green button
4)press the yellow OR blue button
5)stop automatic at opposite corner OR pressing red button.

If somethig wrong happens: stop, ajust the distance from surface (if needed) and restart from the current position

Enjoy!