*Originally posted by sanddrag *
This drill press should also be functional with a nice table. It would be easy to take a production drill press and swap a 12VDC motor in it with a battery. The cheapest new press I found was $70 but you could probably get one off ebay for cheaper.
The key word here is portable… I don’t know many people that want to haul around a 50lb drill press.
When inventing something, people try to modify existing designs. The true essence of inventing is to think of new ways to do things or something completely new.
How about, instead of making a portable drill press, make an attachment that fits over the chuck of any drill (since they are pretty much standard sizes). It would keep the drill perpendicular to the drilling surface, and would be spring loaded. When you wanted to drill straight, you’d put the end of the attachment onto the surface, and then push down. If you’ve seen a nailgun, it would be something like that. The difference is the part that compresses in a nailgun is a safety feature, whereas here it is a feature to drill straight.
You’ll have to figure out a way to conform to the part, in order to keep the drill perpendicular to it. Either that or you can make it go around the part and put it on the thick wooden block that the drill could drill into. Viola, a 2 piece poor man’s portable drill press. The wooden block thing would be easier because it would be difficult to keep the drill parallel to the part if you are drilling a thin part. To make it easy, you could make it fit a specific model of a drill that you may have lying around.
Now that you have the idea, the trick is to make the spring part. You can’t just use a solid shaft because it will hit the drill motor. However, you have to make it rigid enough to keep the drill straight as you press down.
If you market this and make millions, I want 10%.
However, if you a dead solid on making a drill press, the CIM should be fine if all you want to do is demonstrate it. At 5000 RPM the CIM (stock) puts out 1 N-m of torque whereas the bosch drill motor puts out 3 N-m at 1500 RPM (both at 40A, but that’s scalable). Just as long as you’re drilling into something soft like wood or plastic, the CIM should work fine.