Roughing endmill feeds and speeds

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In general "at the end" is more natural. (For example, "In German the verb often comes at the end of a clause.") It seems to me that they have used "on the end" here because the question tag is something extra that you ADD ON. You could even use "onto" in this specific context.

Roughing end millsfor sale

I am familiar with " at the end" and " in the end" constructions, but I have found in "English Grammar in Use" book, the following sentences that contain "on the end":

I like to think of prepositions as points in a concrete space. I then try to think of their abstract meaning in relation to that concrete position. 'At the end of the board' can reference a point at the end of the board, near the end of the board (very near the end). 'Put on the end' in physical space places it more toward the extreme en--on the horizontal or vertical end. Abstractly it would mean to attach it to the end. E.g. Putting more ice cream on my cone (additional ice cream where the first scoop ends). I wonder if that helps?