with doing multiple operations there more handling of the parts , more room for loading errors , more power consumption and more space taken up to accomplish the same thing , there is more fixturing , more setup time , more labor . with the right jobs on that machine it can be run lights out and even pushed to the extent that it can be monitored from home so someone can spend a few hrs over a weekend and be pumping bars and changing a few tools .
the one machine can be replaced with 3 haas machines but that is the case if you buy a mori mill as well , mori's are far greater quality and performance machines and will last an extremely long time which can justify the costs as long as the company has an assortment of other machines to cover other types of work
I think a twin spindle should be accompanied by a twin turret , that way one spindle doesn't sit idle
I worked with a nakamura twin turret twin spindle with live tooling and a bar stacker , with the few jobs that were designated for the machine it was paid off within the first year of the company owning it , its been over 10 yrs and that machine is still running strong , so with the right jobs and the right setup then it can easily be justified
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