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changing relation value to round numbers


New member
i've been trying to relate the features in a linear guide in a wa that i can easily change the length of the rail and having just correct number of holes. the problem now is that the number of features can only be round numbers. anybody knows how to round a number to the lower side.

e.g. the result of a calculation is 8.7 and i'd like to change it to 8.

anyhelp?? thanks...