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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Haas Vs. Makino Part 2
On Jan 10, 9:19*pm, jon_banquer wrote:
http://www.emastercam.com/board/inde...pic=71378&st=0 More comments from someone who isn't a Haas fanboi: "In reality, there is only a $24K difference in cost between these two machines. That is peanuts compared to the performance advantage of the Makino. I wouldn't necessarily call this particular Makino as a "high end" machine. It comes from a "high end" manufacturer, however, this particular model is at the bottom of the Makino scale. It is an awesome machine for the money. Accurate, strong, flexible, etc, etc. There is NO comparison between these two machines. This Makino is vastly superior in every way." "Accuracy is a very misunderstood parameter. A Haas may have "local accuracy" but fails miserably in terms of "volumetric accuracy". As mentioned in one of Bob's posts, temperature change in the spindle or ball screws can play havoc, especially on large parts, or parts ( molds ) with long run times. A very simple way to check this is to indicate a fixed ring mounted to the table and set it to X0Y0 in one of the fixture offsets. At any given point during the day, call up that offset and move back to this position and "re-indicate" the ring and see how much movement you have on the indicator. It is appalling." "Sure, if you cut a rectangular slot in a piece of material and the run-time of the part is very short, yes, you can hold .0005" Unfortunately, this never happens in mold and die work. I can easily demonstrate "drift" on a Haas VM3 of upwards of .003" On the Makino, it will hold "true position" all day long no matter what you throw at it with +/- *.0002" Metalworking content. |
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