What was happening isvwhen you remove welders and attach grinders they would fail to be recognized and resulted in not being able to use sensors or timer blocks to control ,seems once block is destroyed even adding same block back with same name would not work ,that's how I ended up with a programmable block to find new welders or grinders ,wish I had a way to simplify it without them

ah, whats the point of this, you can do the same thing with timer blocks, just count how many sec there is too build something and set a timer to turn on a grinder when it's done building and one more timer to turn off the grinder, grind time for conveyors is 00:00:10 on a timer block, and welding is about 00:01:00 on a timer block, one last thing programmable blocks cause more lag then timer blocks