FREE BOOKS

Author's List




PREV.   NEXT  
|<   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115  
116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   >>   >|  
---+---------+---------+---------+---------+ | | High Limit | -0.0010 | -0.0012 | -0.0017 | -0.0020 | -0.0025 | | X | Low Limit | -0.0020 | -0.0027 | -0.0035 | -0.0042 | -0.0050 | | | Tolerance | 0.0010 | 0.0015 | 0.0018 | 0.0022 | 0.0025 | | | High Limit | -0.0007 | -0.0010 | -0.0012 | -0.0015 | -0.0020 | | Y | Low Limit | -0.0012 | -0.0020 | -0.0025 | -0.0030 | -0.0035 | | | Tolerance | 0.0005 | 0.0010 | 0.0013 | 0.0015 | 0.0015 | | | High Limit | -0.0005 | -0.0007 | -0.0007 | -0.0010 | -0.0010 | | Z | Low Limit | -0.0007 | -0.0012 | -0.0015 | -0.0020 | -0.0022 | | | Tolerance | 0.0002 | 0.0005 | 0.0008 | 0.0010 | 0.0012 | +-----+------------+---------+---------+---------+---------+---------+ [1] Tolerance is provided for holes, which ordinary standard reamers can produce, in two grades, Classes A and B, the selection of which is a question for the user's decision and dependent upon the quality of the work required; some prefer to use Class A as working limits and Class B as inspection limits. [2] Running fits, which are the most commonly required, are divided into three grades: Class X for engine and other work where easy fits are wanted; Class Y for high speeds and good average machine work; Class Z for fine tool work. =Pressure for Forced Fits.=--The pressure required for assembling cylindrical parts depends not only upon the allowance for the fit, but also upon the area of the fitted surfaces, the pressure increasing in proportion to the distance that the inner member is forced in. The approximate ultimate pressure in pounds can be determined by the use of the following formula in conjunction with the accompanying table of "Pressure Factors." =Pressure Factors= +-----+-----++-----+-----++-----+-----++------+------++------+------+ |Diam-|Pres-||Diam-|Pres-||Diam-|Pres-||Diam- |Pres- ||Diam- |Pres- | |eter,|sure ||eter,|sure ||eter,|sure ||eter, |sure ||eter, |sure | |In- |Fac- ||In- |Fac- ||In- |Fac- ||In- |Fac- ||In- |Fac- | |ches | tor ||ches | tor ||ches | tor ||ches |tor ||ches |tor | +-----+-----++-----+-----++-----+-----++------+------++------+------+ |1 | 500 ||3-1/2| 132 ||6 | 75 || 9 | 48.7 ||14 | 30.5 | |1-1/4| 395 ||3-3/4| 123 ||6-1/4| 72 || 9-1/2| 46.0 ||14-1/2| 29.4 | |1-1/2| 325 ||4 | 115 ||6-1/2| 69 ||10 | 43.5 ||15 | 28.3 | |1-3/4| 276 ||4-1/4| 108 ||6-3/4| 66
PREV.   NEXT  
|<   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115  
116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   >>   >|  



Top keywords:

Tolerance

 

Pressure

 

pressure

 
required
 
limits
 

Factors

 

grades

 

conjunction

 
surfaces

fitted

 
approximate
 

ultimate

 

forced

 

member

 

proportion

 

increasing

 

determined

 

pounds


distance
 

formula

 

accompanying

 

question

 

selection

 

Classes

 

decision

 

prefer

 

working


quality

 

dependent

 

produce

 

reamers

 

ordinary

 
standard
 

provided

 

inspection

 

Running


assembling

 
Forced
 
machine
 

cylindrical

 

allowance

 
depends
 

average

 

divided

 
commonly

engine
 

speeds

 

wanted