Выражение встречается в следующем контексте:

Chop cutter using Orbital Technology. Orbital cutting technology offers advantages in comparison to the traditional chop cut in that the contact area between abrasive wheel and the sample is kept as small as possible (MACC = Minimal Area of Contact Cutting). This is achieved by the eccentric rotation of the wheel. Thus the wheel continuously changes its position and has only a small point of contact with the sample. With the orbital cutting technology you receive fast and deformation-free cuts, and can cut large samples and/or samples which are difficult to cut with the normal chop cut. Another advantage with orbital cutting technology is the cooling agent can flow directly into the cutting area, increasing the cooling efficiency and preventing unwanted overheating.
Заранее спасибо

http://www.multitran.ru/c/m.exe?shortf=1&a=phr&a=ShowTranslations&s=chop+cut&L1=1&L2=2
то есть что-то режуще-рубящее, возможно режущее поперек