In horizontal milling process (up/down) milling provides

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In horizontal milling process (up/down) milling provides better surface finish and (up/down) milling provide longer tool life.

1. Up milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.
2. Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.
3. Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so higher temperature hence less diffusion.
4. Down milling process provide better surface finish because it start cutting process with finished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.

Correct Option: B

Down milling process provide better surface finish because it start cutting process with unfinished surface & in down milling longer tool life because of relative velocity between chip & tool so lower temperature hence less diffusion.