There are bits called 'fly cutters'. I have one that cuts up to 8" diameter and is very good with thin woods and all plastics. I have seen more robust ones in specialty wood stores.
Depends on the diameter of the conduit. Try for 1/4" larger diameter drill bit.
For a cut tap the correct drill size is a #17 drill, which has a diameter of .173 inches.
For all practical purposes an 8mm drill is equal to 5/16 inch.
The thinnest drill bit available for purchase is typically around 0.0135 inches in diameter, also known as a 80 drill bit.
if the diameter 5/16 inches then you covert the 5/16 into 0.3125 inches. divide 5 by 16=0.3125 which is a little bigger than 0.3! ;)
The recommended 5 drill bit size for drilling holes in metal is 0.2055 inches in diameter.
There are 25.4 millimetres in one inch. Therefore, rounded to two decimal places, 8 millimetres is equal to 8 / 25.4 = 0.31 inches.
18.6240 yd³
The best type of drill to use for screws is a cordless drill with adjustable torque settings.
7/8 diameter drill or .875
Wrong Question... You first determine the hole size required for the mine plan and then based on the air capacity and pulldown capacity of the drill rig you can determine the optimal drill pipe diameter to achieve productivity from the drill. What size is your drill? Air Capacity in CFM, Pulldown Capacity. What size does your drilled hole (diameter and depth) need to be to suit the mine plan (for the drill & blast process)?
A hand drill is scommonly used for holes under 1/4 in in diameterANS 2 - The diameter is simply the width of the drill bit from side to side.