To create the most accurate 20mm worktop, you need the best fitting 20mm dog. That was our design intent when we set out to create the CF-Dogs or "Close Fitting" Dogs. Most 20mm dogs on the market feature a 19.90mm body, which fits well in the Festool MFT/3 but can result in needless play when used with the Parf Guide System or a 20mm worktop made with precision by CNC router. Instead, our CF-Dogs feature a 19.98mm body providing a near zero clearance fit when inserted into a 20mm bench dog hole.
A Smart Add-On to the Parf Guide System
The introduction of Peter Parfitt's Parf Guide System (PGS) now provides the everyday woodworker a means to create highly accurate 20mm patterned worktops to near-CNC accuracy. This system relies on a drilling jig that is indexed to the table via two 20mm bench dogs. Because our CF-Dogs fit into this drill guide and indexing holes with near-zero clearance, you will achieve more accurate hole positions compared to using a traditional 20mm bench dog. This is why our DoubleGroove™ CF-Dogs are the perfect add-on for those using the Parf Guide System.
The usefulness of our DoubleGroove™ CF-Dogs is not limited to those using the Parf Guide System. Many woodworkers are creating custom 20mm tops with CNC routers capable of machining holes accurate down to ±0.002” (0.050mm). With this kind of accuracy, many discover that their traditional 20mm bench dogs now fit with too much play; a problem that can be solved with DoubleGroove™ CF-Dogs.
So Exactly What's Different Here?
DoubleGroove CF-Dogs are distinguished by their slightly larger body diameter, 0.003" (0.08 mm) to be exact. While this change may seem minute, it makes all the difference in eliminating any unwanted play that may be present when a standard 20mm dog is inserted into a precision cut 20mm hole. A CF-Dog can be easily identified by the addition of a single annular groove in its top surface.