African Blackwood is not Balsa Wood!

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Even though it was clear to me before, one thing become aware again to me in the sawmill: African Blackwood is not balsa wood! Due to the fact that actually every larger African Blackwood trunk has a hollow core and hard clay of the worst kind is in it, the wear on saw bands was enormous! But whining does not help either, you can only try to cut it around and hope for the best. The logs hade a diameter up to 60cm, the total weight of this lot was about 800kg.