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Dimensions test of drop forging

Linear dimension

Linear dimension,or size,it is to point to the distance between two points,such as diameter,radius,depth,width and height,center distance,etc.To express the dimensions of drop forgings exactly,lots of linear dimensions will be show in a drawing.After finish production of products,we will test all these linear dimensions by vernier caliper or digital caliper,to check if these dimensions are within the required tolerances.For outer diameter,it will be more accurate to use outside micrometers.

Angular dimensions 

Angular dimensions are usually shown the size of Angle,like 30,such angular is tested by universal bevel protractor.

Radius testing

R gauge is using the method of light gap measuring arc radius of the tool.Measurement must make R gauge measuring the circular arc of the surface and the drop forging parts is completely close contact,when measuring the circular arc of the surface and the drop forging is no clearance between workpiece circular degree,on the other hand,this time should be R gauge on Numbers.Because it is visual,so the accuracy is not high,only a qualitative measurement.Although have limitations, but relatively easy to use, avoid the trouble can't be measured

Thread dimensions

                                            
Normally for better assembling,designers will require thread machining after drop forging.For external thread,it will be tested by Go guages and no-go gauges.Go guage will be tightened into the external thread correctly,and you will see no-go guage can not be tightened for the smaller diameters.For internal threads,thread plug gage can be used.

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