Ok, so the other day I was trying to increase the bore of those Blue Bearing Boys wheels to 14 mm, so I could hammer in the Brass Inserts needed to attach the wheel to the drive shaft of the drill motor. (Finally got the damn screws out about a month and a half ago!)

But my drill made literally no impression on the plastic of the wheel. Pretty much right after the bit made contact with the wheel it stopped, leaving a few very minor cuts in the plastic. It's a relatively cheapo Black & Decker drill (Coincidentally it's the exact same model I was initially going to use for drive motors.), but I'm not sure if it's the drill's naff-ness that's at fault or some cruddy drilling technique of mine.

Just wondering how anyone else has gone about doing this? Is there some way of doing it or is it more so a matter of buying a drill with more oomph? Do I need something high-end for this sort of thing? Any help/responses would be really appreciated, thanks! (I hope you guys aren't getting sick of all us new folks asking so many questions!)

Also, just to show that I am actually building stuffs/making some progress here's snaps of the 99% complete battery mount thingy, and also slight changes/more details to the design of the robot. (Hopefully it looks marginally less boxy and basic now, though it still omits the fuse, link and LED.)

https://www.flickr.com/photos/134836804@N02/

I still need to drill holes in the base of the battery mount so it can be bolted to the base of the robot. Annoyingly my drill (or my potentially shoddy technique.) couldn't get through the 3 mm aluminium. :/

Again if there's anything horribly wrong with anything I've done so far please say so!

I'm also thinking of naming the robot Venator (Means "Hunter" in Latin.) if it's not been taken already.

Thanks for reading if you've made it this far. Sorry this post was so long!