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Dowel Pins Inserted Upside Down?

Question asked by Rio Benson on Feb 5, 2010
Latest reply on Nov 23, 2010 by RICH PAUZA

Attention SW:

 

As a conceptual machine designer with 50 years experience, I would like to know where you got your information for the proper insertion of Toolbox ANSI (ASME) Standard Dowel Pins?  As you know, ANSI standard dowel pins have a chamfer on one end and a radius on the other.  The chamfered end is intended for press-fitting, while the radiused end is intended for slip-fitting, not the other way around.  This means that when inserting a Toolbox ANSI Standard Dowel Pin, which would always be into the press-fit hole, the chamfered end should be presented to the hole, not the radiused end as you currently orient it.  On the other hand, ISO Metric Straight Pins are the same on both ends.

 

By the way, if you intend to correct this error, you might also want to consider that standard practice is for a dowel pin when used only for precise locating purposes (as opposed to providing structural strength) the pin length is usually twice the pin diameter with half of it being pressed into the hole.  Most seasoned machine assemblers have a custom-made dowel pin insertion guide tool that is sized for this purpose, allowing them to install the pins quickly with only the guide tool and a ball-pein hammer.  It would be a great time saver for many of us if this were the default SolidWorks insertion when the pin length equals twice the pin diameter.

 

I realize this is a small problem, but since SW places great emphasis on machine design you might as well do it right, wouldn't you say?

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