A feed$-$roll assembly is to be mounted at each end on support brackets cantilevered from the machine frame as shown in figure. The beam is made of AISI $1040$ normalized steel via hot rolling. The feed rolls experience a fully reversed load of $1000$ N amplitude, split equally between the two support brackets. If the number of safety of the beam must be $2\mathrm{.}25,$ determine whether the bracket is safe or not for the infinite life service condition under the reliability of $99\mathrm{.}9\%.(60$ pts$).$

U$$ noktaya, $$ekilde g$$sterildi$$i gibi makine $$er$$evesinden ba$$lanm$$ kiri$$ yard$$m$$yla bir besleme rulosu tertibat monte edilmek istenmektedir. Kiri$,$ s$$cak haddeleme yoluyla AISI $1040$ normalizasyon tavlamas yap$$lm$$elikten $$retilmi$$tir$.$ Besleme rulolar$,$ iki destek eleman aras$$nda e$$it olarak b$$l$$nm$,$ tamamen tersinir $1000$ N genlikli bir y$$ke sahiptir. Kiri$$in emniyet katsay$$s$2\mathrm{.}25$ olmas zorunlulu$$u bilindi$$ine g$$re$,$ kiri$$in $\%99\mathrm{.}9$ g$$venilirlik alt$$nda sonsuz $$m$$r servis ko$$ulu i$$in g$$venli olup olmad$$n$$ belirleyin $(60$ puan$).$

Determine the lifting and lowering torques and the efficiency of the power screw shown in the figure. The screw is a single$-$start Acme M$30$x$3\mathrm{.}5.$ The axial load is $4500$ N $.$ The screw and nut are lubricated with oil. Sliding friction $=0\mathrm{.}15(40$ pts$).$

$$ekilde g$$sterilen sonsuz vidan$$n kald$$rma$,$ indirme torklann$$ ve verimlili$$ini hesaplay$$n$$z$.$ Vida tek a$$zl bir Acme M$30$x$3\mathrm{.}5\text{'}$ tir. Eksenel y$$k $4500$ N'dur. Vida ve somun hareketi esnas$$nda ya$$ kullan$$lmaktad$$r$.$ S$$rt$$nme katsay$$s$=0,15$ 'tir $(40$ puan$).$

Note! State all the assumptions that you make in design process. Not! Tasar$$mdaki t$$m kabullerinizi belirtiniz.