This disclosure generally relates to a grinding jig (100) for holding a knife (200) in a grinding machine (300). The described grinding machine has a grindstone (210) and a support bar (350) for supporting a grinding jig. The grinding jig (100) comprises: a first and a second clamp half (110, 120) arranged to hold between them at least a portion of a knife, and an elongate support portion (160) for supporting the grinding jig (100) onto a support bar (350) of a grinding machine (300). In more detail, first and a second separate grinding jig halves (101, 102) are mutually facing each other and comprise respective clamp halves (110, 120) and elongate support portion halves (161, 162). The grinding jig (100) is arranged such that the first and the second grinding jig halves (101, 102) may be releasably forced towards each other to hold a tool blade between the first and a second clamp halves (110, 120).
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