Disclosed is an apparatus for automatically detecting the position of a cutting tool in a computerized numerically controlled lathe which is capable of preventing over-load operation of a driving motor by allowing an arm having a touch sensor mounted thereto to safely stop at a position while the driving motor stops operating. The apparatus for producing trichlorosilane includes: a converter reactor for converting a raw material gas containing tetrachlorosilane and hydrogen into a reaction product gas; a cooler for cooling the reaction product gas fed from the converter reactor; and a plurality of provided in the cooler for spraying cooling liquids. The present invention is not limited by which golf ball layers are formed from an HNP composition, so long as at least one layer is formed from a relatively soft HNP composition and at least one layer is formed from a relatively hard HNP composition.