There’s been a whole lotta shakin’ going on here in SoCal but it’s going to take more then a little rumbling to keep me from bringing you some ASME goodness. This week we finally get to finish up on dimensioning features per Section 1.8 of ASME Y14.5M-1994. Make sure you go back and read the previous post, if you missed any of them. Let’s go ahead and jump right into the fun before we get hit with an aftershock.

Intersecting Surfaces

Last week, when I covered dimensioning chamfers and I accidentally left one out. When you chamfer surfaces that are anything other then 90°, use the methods shown below. In SolidWorks, select both edges while holding the CTRL button on your keyboard and select the Point tool in Sketch toolbar. You can change the display of the virtual sharps in Document Properties -> Virtual Sharps.

Keyseats

When you dimension keyseats, dimension the location, height, width and if necessary, the length of the keyseat. When dimensioning the depth of the keyseat, dimension from the bottom to the other side of the shaft by holding the SHIFT key.

Knurling

Knurling…isn’t that that one sport in Canada with a broom and a big fat rock? Oh wait…that’s curling. Knurling is dimensioned as shown below indicating the type, pitch and diameter. The diameter is always indicated prior to knurling but the post-knurling diameter can be dimensioned when important.

When dimensioning knurling for press-fits use the same nomenclature as before but make sure you dimension the minimum diameter after knurling.  For more information on knurling, refer to ASME B94.6.

The following are other feature types to be dimensioned that require referencing other ASME/ANSI standards that will be covered in future Standards Wednesdays.

Screw Threads

The most common method for dimensioning internal or external threads in a drawing is with a note callout with the thread type, size and tolerance. If you create the thread using the Hole Wizard, dimensioning should be piece of cake using the Hole Callout. But if you used any other method, you will have to specify the thread callout yourself. Refer to ANSI Y14.6 and ANSI Y14.6aM for more information on thread callouts or if you have one, use the Machinery’s Handbook. You can always get one here.

Surface Texture

Information on specifying surface texture on drawings can be in ANSI Y14.36 and ANSI/ASME B46.1.

Gears and Involute Splines

Dimensioning gears is described in ASME Y14.7 and will also be covered at a later date but Involute Spline requirements are discussed in the ANSI B92 series of standards. The ANSI B92 series are not in my possession, so I will not be covering them. But anybody who is familiar with the series and would like to do a guest post, please let me know.

Casting and Forgings

The standard that covers Casting and Forgings, ASME Y14.8M, will be covered when I discuss injection molded parts since that is the only standard (that i know of) that remotely relates to that injection molded parts.

Finally we are all done with dimensioning features per ASME Y14.5. Next week we will begin discussing Location of Features per Section 1.9 of ASME Y14.5M-1994. If anybody has any question regarding this or any previous post, please feel free to ask. I will always do my best to answer your questions, If I miss your question… I appoligize, I have been extremely busy lately.

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