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• <br /> ral ART ANDERSON TASK: FAGOS001 DATE: 08/10/2017 <br /> ASSOCIATES TITLE: PREP:ADT <br /> VALUE sEYOND ENG,NEER,NG ffirrif <br /> Certified Machine Foundation Drawings <br /> 202 Pacific Avenue <br /> Bremerton,WA 98337 <br /> 360-479-560o /www.artanderson.com Supporting Calculations <br /> Project Description: <br /> Three Okuma MU-6300V 5-Axis Vertical Machining Centers are to be installed at Umbra Cuscinetti in Everett, WA <br /> In addition, a Kuka robot on a linear translation track will be installed adjacent to the machines, along with some <br /> material storage area. Portions of the floor have designated flatness criteria.This information was provided to AAA <br /> by Gosiger.The following information pertinent to the design was obtained from the 2013 structural drawing set <br /> provided to us. <br /> Allowable bearing capacity of soil is 3,000 psf when bearing on dense native material or compacted fill <br /> Coefficient of subgrade reaction for mat foundations: 150 pci <br /> Slabs bear on undisturbed soil or structural fill compacted to 95% maximum dry density <br /> Column which sits between machines is on building grid point F5 <br /> Existing slab on grade is 6"with welded wire fabric or rebar at its center <br /> Column footing is 6'6"x6'6"and 18"deep <br /> A vapor barrier was used below the slab <br /> The slab has, at minimum, 20'spaced control joints <br /> Machine Foundation Calculations <br /> Machine Weight 37,180 lbs <br /> Max workpiece weight 990 lbs <br /> Total 38,170 lbs <br /> The area of machine foundation from Okuma drawing is 145.67"x 98.43", approximately 100 square feet <br /> A 19.69"slab is specified on the Okuma drawing. This is thicker than what is required for strength, but <br /> a 20"slab will be used, to follow Okuma specifications.The larger foundation will create a more rigid <br /> base to help with vibration control. <br /> Weight of concrete <br /> 20"thick, 150 pcf 24,893 lbs <br /> Pressure applied to soil <br /> from concrete and <br /> machine 631 psf <br /> 4.38 psi <br /> The Okuma drawing calls for 6.44 psi ground resistance,which appears to include a 1.5 safety factor from the actual <br /> pressure of 4.38. Since the soil has a bearing capacity of 3,000 psf, approximately 20.8 psi, it will support the machin <br /> It should be compacted to 95% maximum dry density, as originally called for under the existing floor. <br /> Slab Thickness Check <br /> Reference: UFC 3-320-06A Concrete Floor Slabs on Grade Subjected to Heavy Loads <br /> Per the referenced UFC, the maximum allowable stationary live load is: <br /> w=257.876*s*sqrt(kh/E) <br /> Final Calcs <br /> C-1 OF 5 <br />