ROUTING TO .001"
A lot of woodwork is jig & fixture dependent. Precision routing is almost always done with some holder, jig, or fixture. Fixture component (and the fixture itself!) deflection in the .001-.003" area is a major source of error; you cannot see deflection of this magnitude so you cannot assume it does not exist (see Fig. 3). A travel indicator is called for here. Most have magnetic bases, useless for the woodworker working on substrates of wood and aluminum. I use a 15$ Chinese indicator in a holder I made. I can weigh it down if I can't get a clamp on it. If the jig component (fence, toggle, holder, crowder, etc) is suspect, test it for deflection before committing it to service.
Set the indicator up and apply a force much greater than you expect to use in the operation (see Fig. 4). See if the damn thing bends. If it does, (2-3 mils are too much) take steps to stiffen it. Clamp it (the component) in more than one place, double its section, use another material, add more hardware, change its substrate, do what ever it takes. This kind of error adds up fast. And, to be sure, we need to understand a few principles of measuring before we move on.
The indicator above, for example, is largely independent of technique; your touch has nothing to do with its accuracy. As such, if you can get it into play when investigating, it will be an advantage over other measuring devices. Most of the time we are not so lucky. Your touch, sight, and even your hearing are called upon for the close measurement. And these senses are all arbitrary and will influence the value of the measurement. This is metrology, the study and management of measurement.Back to Routing to .001" page
Home | 7310 Subbases | Beveled Straight Edge | DW 611 | Edge Guides | Lessons/Consulting | Machining Plastics | Mortiser | Morticing with a Router | New Pix/Product | Offset Sub-base | PR-20 Sub-base | Precision Subbase Kit | Replacement Rounds | Router Encounter PDF | Router Table PDF | Routing Outing PDF | Routing for Starters PDF | Right Angle Templet | Router Table Fence | Routing to .001" | Sale | Selecting a Router | Straight Edges | Tee Square | Vertical Trim Subbase
Copyright © 2009 Pat Warner
Last modified: Thu Sep 1 07:38:31 PDT 2005