Do drill bits need to be cleaned and/or sharpened. I gave my 0.25" bit a real workout yesterday, used it for about six straight hours drilling holes for the legs and connections. I was also having a problem with burning the wood at times, but I think I was just pushing too hard on the drill, I have to let the drill do most of the work next time. Progress was substantial, however. Three of the five modules are now standing and connected to each other; the fourth module is standing on its own legs; the fifth module has all the lumber cut for the frame. I'm hoping to be laying track (or at least subroadbed) by the end of the month.