Thread: Modifying a DC-7 Dust Collector

Went down to Hare & Forbes / Machinery House this morning to pick up my shiny new blue DC-7 dust collector. http://www.machineryhouse.com.au/W329

Firstly I walked in the door and felt like a kid in lolly store... Equipment of all descriptions everywhere

Ok so back to the dust collector... when is a size not a size? when it is made in Taiwan... I bought an additional accessory kit at the same time, and upon unpacking it found the sizes weren't exactly what they are meant to be.

So where to begin... Figuring I have no intention of using the three 100mm inlet adaptor I immediately measured the inlet of the DC-7.

The OD is 150mm and is not too far short of my desired 6". To try get an idea of how well it would mate to the outlet of the dust extractor I slipped the centre piece I have been working on over the DC-7 inlet.

While it's not a tight fit, its not really a mega loose fit either. The problem is the ID of the DVW pipes I am using is slightly larger than the size of the hose I need to use.

So in reality I am going to need to step down the bigger DVW fittings to have any kind of chance of getting a hose on them.

So where does this leave me?... well even though the OD of the DC inlet is 150mm, I am expecting that the ID of the 150mm / 6" hose is probably going to be around that same size.

So really I don't see a great deal of benefit to modifying the inlet of the DC-7.

So moving right along that brings me to the DC outlet... A quick measure of the DC outlet ID (as that is the maximum air that will flow) and I get a measurement of 155mm * 118mm or 18,290 mm2.

A quick backwards calculation to see how big a circle that gives me and I work that out to be a diameter of 152.64mm

So effectively the outlet is marginally bigger than the inlet. I then took a quick look to see what it would look like if I left out the 1 to 2 adaptor. Figuring the less time the out air spends squished the better.

So I put the filter bag up against the outlet of the DC-7 to see if they would marry up. As expected they will. Now the question is I know it will flow better going directly to the filter bag without the 1 to 2 adaptor, but if I was to use both filter bags it would half the pressure.

What do you think about what you gain verses what you loose?

Of course in order to use the single bag I would need to lift the motor off the ground, but that would then allow a very short section of 6" pipe between the DE and the DC.