Downdraft design questions

I can only guarantee the software cos its running on Linuxcnc!
I give you > 50%

I am being cautiously pessimistic.

Well I hope this works for you. Looks like I'm joining the club.


This is a Multicam router dust extraction fan the guys next door were throwing out. I'd done them a favour by unloading a truck with my little forklift so I brought it home all of 10 metres when I came back.

They said it had a busted motor but 15 minutes later, we had diagnosed a burnt out switch and I bypassed it in a temporary fashion and its a goer!

OOPS sorry: 1925 CFM 3 HP motor which is generally as big as we go on a single phase circuit

That is a great score! It pays to be a friendly neighbor.

We made a little bit of progress yesterday. Tube is now mounted to the slide out 'trough' for easy access to actuators. Mounts for actuators are on the duct and the doors are ready to go. Still waiting on four more actuators to show up. Hopefully soon.

The bulkhead where the copper lines will transition to plastic tubes is complete.

Is that your Hilux? Also, I could not help but notice the blue stack/hang bins... we use those all over the shop. Greatest thing since canned beer. I even put some on the side of the new table to hold misc consumables and whatnot.

How will you seal the end of the duct tube to the fan? I like how you have mounted the duct tube to a PFC so you can side it out and clean it. For a table that size depending on how much work it does I would say will need cleaning fairly regularly.

Also with your pics, if you insert them into your post they are easier for people to see.

Should be a good table when finished.

The duct tube slides into a 8" round duct fitting that is slightly tapered to create a snug fit. On the outside of the table we have 8" round duct to the blower. I will post some more pics and insert them properly as this project unfolds.