550 JUil.L SySlli.M TECIISICAL JOURNAL 



MaCIIINF. KyUIPMENT 



TIk- niacliiiu' (•(|uii)nu-ni on which the operations are t(5 Ije per- 

 formed is the next thing gi\en consideration, and the most iniportanl 

 features arc: 



1st. To select a machine that is cai)al)ic of producing the parts to 

 the desired accuracy. 



2nfj. To select a machine that will result in the maximum produc- 

 tion, keeping in mind, of course, the accuracy required. 



3rd. To give proper consideration to the investment, maintenance 

 and overhead charges incurred by the machine selected 

 so that these charges do not offset production economies 

 expected. 



4th. To insure that tlie machine selected is u\) to dale with regard 

 to the latest machine practice developments worked out 

 by Hawthorne and by commercial machine manu- 

 facturers. 



There are, of course, many other features which must be taken 

 into account in selecting the machines for the manufacture of various 

 kinds of parts. 



Ill tile case of bl.uiking ojicr.ition on a punch i)rcss, the object is to 

 secure the smallest and therefore the fastest press which has sufficient 

 tonnage capacity to perform the operation required. 



Where the part is to be manufactured on an automatic screw 

 machine, the problem is to select the fastest machine that will pro- 

 duce the work to the accuracy required, and at the same time select 

 a machine that has a sufficient number of spindles and tool positions 

 to permit all the operations retiuired being ])irfornu(] l)ilorc the 

 parts are finalh' cut from the rod. 



A part having a large number of holes to be drilled will necessitate 

 the selection of a nuilti[ile spinille machine that can be set up to 

 prtxluce the maximum number of holes in one or se\eral parts at 

 each operation of the drill press. 



We have worked out numerous improvements in romnurciai 

 machinery that ha\c now been incorporated in the prcxluct of many 

 machine tool manufacturers. .Some of the most important of these 

 arc motor driven pumh i)re>i-ic<, screw machines, milling machines, 

 lathes, etc. 



