Waxing machine with 6 heads to granite slabs. The headstocks carry a vertical pneumatic displacement and are guided by a steel stem and cotter. They are equipped with an independent and adjustable back pressure system, which allows an adaptation to the thickness of the piece that is to be elaborated, keeping the strength over the abrasive constant flow. The headstocks, when rotating, have a frequency converter that allows an adjustment of the adequate rpm for each case. The displacement speed of the headstock-carrier Bridge can also be adjusted using a frequency converter.