Diamond Dowel Pin

What is a positioning pin?

Dowels are a great way to make sure the parts you're assembling fit the way you want them to fit. Drill two holes opposite each other in each part, install a cylindrical dowel, and there you go! Your parts are aligned exactly the way you want. If you have alignment issues when using only bolts or other fasteners, dowels can be a good way to secure components.

One downside of cylindrical pins, until you punch out and start drilling, is that they only constrain the part in two dimensions. For example, a pin prevents parts from sliding up and down or side to side, but they can still rotate around the pin. You might say, "Just add another pin and your rotation problem is solved!" Yes, but if the alignment pins are even slightly misaligned, they can jam and prevent the parts from fitting together properly.

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Enter the Diamond Dowel Pin to the rescue. The rhombus in the name refers to its shape - the pin is cut in small numbers on all four sides to form a rhombus with original bends on two opposite sides. This unique shape allows the pin to contact the alignment hole with a small surface area, preventing movement in one direction (left/right) while allowing small changes in the other direction (up/down). Now that your parts can't be rotated, you still have a little leeway when assembling.

One thing to consider when installing a Diamond Dowel Pin is the orientation of the contact surface. If your assembly has critical measurements that must be maintained, you should align the diamond dowels in this direction. The contact surface on the pins will prevent movement and maintain alignment while allowing small movements in non-critical directions. Engineers and drafters should take care to annotate your drawings so your fitters can install the pins in the correct orientation.

Diamond dowels are also used for concentric parts when the rotation of the parts is not critical but the central axes must be aligned. In this case, simply fit the three diamond pins on a circle centered on the part with the contact faces radially aligned. The two centers of the part will be coaxial, but the part can be rotated slightly to aid assembly.

In conclusion, Diamond Dowel Pins are almost always used with plain cylindrical pins (except for the last radial example). Together, they give you a highly accurate finished product without the binding issues common with straight pin-only assemblies. While getting a bigger hammer will usually fix any misalignment issues, substituting a Diamond Dowel Pin will keep tempers low and improve your quota for successful fits.

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