On Thursday, May 20, 2021 at 10:52:59 AM UTC-4, Leon wrote:
On 5/18/2021 5:58 PM, Bob D wrote:
On Tuesday, May 18, 2021 at 3:08:51 PM UTC-5, Leon wrote:
One has to wonder why there are oval ports.

Maybe Festool had a summer intern mechanical engineer doing the design and their focus was on the fluid mechanics equations. There are no factors in fluid mechanics for "is this practical".

Yeah! What you said. ;~) I have to think no room for a round port on
the base unless they made it much smaller.

That sounds reasonable. The dust port on the body of DW411 sander is a very thin slot.
To convert that to a round hose connection port would take a pretty big "circle".

This is the DW411, with no built in port for a hose.

https://tehnoskarb.ua/images/tehnosk...2/4/649224.jpg

They must have gotten some feedback because the newer models convert that
slot to a round port via a modification to the body of the tool. Seems like Festool
could do this if they wanted to:

https://www.picclickimg.com/d/l400/p...rded-Heavy.jpg