Dust Collection on old Powermatic 77

[Joe Wood]

I'm at a standstill, I can't find a part I need. The intake on my DC has a 'hub' I'll call it, with three couplings angling out, and I need just one intake pointing straight out. Anyone know where I can get different style intake hubs? Mine would need a 5 7/8 ID, is that a standard size for dust collectors?Untitled.png

[Peter Christensen]

You could take Item No 6 off and replace it with an MDF disc with the fitting of your choice glued to it. If you build up the face opposite the impeller for the pipe a little you can radius the edge facing the impeller for a slight improvement in airflow.

[Jim Becker]

Just remove the (nearly useless) three-way and there will be a larger flange behind it as per the diagram. Measure that to determine what size duct will fit or need to be adapted to fit and go from there. It's probably 6-8", depending on the specific machine.

[Joe Wood]

Right on Jim, say, is a 3 HP system enough to go to a 5" hose? If it is, what do I do about the 4" exhaust port on my 15" planer, use a reducer for that?

[Jim Becker]

The system theoretically has the capacity to support duct work that is the size of that larger flange. 5-6" is generally a good connection size for a planer and you can reduce right at the tool to match the 4" port if you don't want to engineer a larger port. The larger the duct/hose, the more air that can move through it at a given velocity and the more air that's moving means more dust/chips are moved with it. DCs operate on air flow.

[Joe Wood]

The OD for that inner flange is 5 7/8", do they make a coupler for that size?

[Jim Becker]

The OD for that inner flange is 5 7/8", do they make a coupler for that size?

6" "something" probably slips right over that...hose/duct, etc.

[Joe Wood]

I'll be using pipe not hose, I guess I can put some weatherstripping around it to make a tight seal. I'm going to go out and get all the pieces now, appreciate all the help!

[Joe Wood]

Thanks again for the help and advice, so nice having good dust collection on the table saw! As soon as the shark guard arrives I'll be all set.