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General situation Xia, we of laser cutting machine of crystal rod of diameter for 7 or 8, so out shot light of spot for 7 or 8mm, and market Sheung Shui cold spread beam mirror of out light mouth maximum out shot diameter General for 34mm, if is 8 of rod, if selection 5 times times of spread beam mirror, 5*8=40, and out light mouth lenses diameter for 34mm, is equal to said has six-fortieths of light on run off has, loss has six-fortieths of energy. 

So do not blindly. Of course, if the customer is not strict with cutting depth, but requires cutting edge smoothing, that is another matter. Another cutter small eyepiece is a consumable, in order to reduce the loss, it is recommended that customers use quartz small eyepiece, although single-chip lenses you dozens of Yuan, but nice, not so easily broken.