Your DC is designed to collect dust from a 2" or 4" port on your tools.
The 2" port is for a shop vac because the tool either has a lot of the
dust trapped (inside the wheel cage of a BS or under the table of a
router table) and what little dust that gets away can be collected
easily by the SV.

The larger machines that have the 4" collection ports are placed there
as an after market product to match up with the existing standard of the
4" dust collection hose. Think! A 4" collection hose has a 12.56
Square inch area across any part of the hose or a 12.56 cubic inch per
lineal inch of the hose. Now to fit this 4" hose into a square port,
the smallest size would be 16 square inches or 16 cubic inches of box
per lineal inch of dust port. This means you have lost 1/4 of your
suction just by placing a 4" hose on the port.

A redesign of the port would effectively remove more dust by using the
full power of the DC and not allow the dust ports to exceeded that of
the hose which brings in the suction per lineal inch.

--
Woody


Check out my Web Page at:

http://community-1.webtv.net/Woodwor...workerJoesInfo

Where you will find:

******** How My Shop Works ******** 5-21-03

* * * Build a $20 DC Separator Can Lid. 1-14-03
* * * DC Relay Box Building Plans. 1-14-03
* * * The Bad Air Your Breath Everyday.1-14-03
* * * What is a Real Woodworker? 2-8-03
* * * Murphy's Woodworking Definitions. 2-8-03
* * * Murphy's Woodworking Laws. 4-6-03
* * * What is the true meaning of life? 1-14-03
* * * Woodworker Shop Signs. 2-8-03