Toolmaking
September 1, 2007
Entry Details
 

# 560
Matt Hemming
Toronto, ON
Dimensions (inches):  
  Width:   4 3/4&
  Height:   2 1/2&
  Depth:   9 1/8&
Materials:   - Padauk (quartersawn)
- Brass flat stock, 1/8" thick (various widths)
- Brass insert nut and screw
Most marking gauges are designed to reference off of a straight edge. This is a marking gauge designed for use on curved edges, both convex and concave. The debate goes on as to what exactly to call this tool. Multipurpose Curvilinear Marking Gauge? Curve Gauge? Compass Gauge? I have been refering to it as a "pupose gauge" because my girlfriend thinks it looks like the tail of a porpoise.
 

Construction:
I started with the body of the gauge. I began by milling down two blanks of padauk. I mitred one end of each piece, then routed a 3/8" x 1/4" groove on each piece, aligned the two pieces to produce the 3/8" x 1/2" mortise in the centre and glued them together. I then cut most of the waste material on the bandsaw, and shaped the body with rasps, files, and sandpaper.

The arm of the gauge is a 3/8" x 1/2" x 9 1/8" piece of padauk with a groove routed in it to accept the brass wearstrip.I cut the brass parts for the body and the arm from 1/8" thick flat stock of various widths, using the tablesaw for straight cuts and a jigsaw for curved cuts, and followed with files and sandpaper.

After attaching the brass parts (using gorilla glue) to the body and arm, I did final smoothing of both parts and inserted the nut for the locking screw, and finished the gauge with tung oil and wax.
 
Using the 'tail' end of the body, the two-points provide registration on convex edges. The edges of the brass strips are rounded for smooth travel, but are parallel with the pencil for positive registration.
 
Using the 'nose' end, the single point provides registration on concave edges, as well as irregular edges. There is a brass wear strip in the nose. Using the gauge this way requires more focus than the tail end.
 
Using the tail end, you can also mark the end of dowels or round stock. Just register the dowel against the inside faces of the tail, set and lock the arm, and then rotate the dowel.
 

Judges Comments
Brian : smart and simple
CS : An awesome and functional piece of sculpture. Works really, really well and feels so good in your hand. Add a few extra coats of oil and some sanding to make this tool a show-stopper.
Clarence : A very nice looker but the finish details fell short. Tools require the same level of finish as all woodworking.

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