Abstract: A pattern sizing tool for use as a milling device for removing a portion of a surface of a stiff material to leave a desired thickness of material and is particularly useful for milling a hard plastic coping like that produced in a tooth replacement procedure for forming, from that coping, a crown as a replacement tooth in a practice of a "lost wax casting procedure". The tool includes a pair of upper and lower arms that are coupled together at their ends to be scissored and are spring biased apart. The upper arm includes a mount with an arrangement for maintaining a dental rotary grinder thereon that has a chuck for mounting a milling burr.