what is the use of punctuation in the poem out out by Robert Frost?

Punctuation, assonance, alliteration and onomatopoeia key to the development of the mood of the poem.

The commas and periods throughout "Out, Out " are used as they are usually indicating both pause and end if sentence.

THere is a device called "hard caesuras" used in the latter part of the poem indicating a break in the action.

Colon in "nothing happened: day was all but done" separates ideas.