There is no set RPM for a drill. It depends on the application and material it is cutting.
The same as for wood or metal, just keep the rpm's down to keep from melting the plastic.
Yes, the larger the drill, the lower the RPM's should be. Furthermore, the larger the drill, and harder the material is, the more secure your fixture must be. For example, drilling a 1/4 hole in wood, you can hold the wood and use a drill. Drilling a 3/4 hole in stainless steel, you need a vise and clamps, and a port-o-matic or bridgeport mill.
Modern dental drill at 500,000 rpm
About 400,000 RPM
with a drill bit......ANS 2 - It helps if you use an automatic centre punch first, so the bit doesn't slide. Also it's better if the drill bit is NOT new, so the edges are not extremely sharp. Drill at a fairly low speed (450-500 rpm) for best results. ( This all applies to Plexiglass too )
Depends on what materials they are normally going to be using it on. Softer materials, such as wood products or soft metals, I'd suggest to get a drill with high rpm's. But if they are going to be using it to drill hard substances then I would direct them towards a drill with a higher torque, as this will help to avoid the drill freezing up or skipping on the materials.
Use a standard HSS drill bit, but slow down rotation to about 500 rpm.
Yes, you can drill Lucite. Keep to a fairly low speed so as not to melt it (below 500 rpm.)
In a bowl of water use a diamond tip drill and cover the stone with water. you need to use the drill with very little pressure and drill half way then drill from other side to keep from breaking out the sufface of the hole. The drill RPM needs to be at least 10,000 - 15,000 RPM.
B. 2,500 rpm
B. 2,500 rpm