Hoses with bypass

[Coen]

I just looked at the Festool 2022 catalog... all the D27/32 hoses are now with the (adjustable) bypass by default. !?!?

 

[Crazyraceguy]

I haven't seen an actual paper version yet this year.
The newest one I have at home is 2018  [sad]

 

[Coen]

I looked at the local online PDFhttps://www.festool.nl/-/media/tts/...ds/downloads/festool-catalogus-2022-nl-nl.pdf
page 173

 

[bwehman]

Yep. My Festool dealer here in town has them in stock already.

 

[mino]

Hopefully the simpler/smaller -no-bypass- hoses will still be available.

There needs to be an option for hoses, or at least optional end caps, that will have the end as the classic bayonet for minimal end size.

I hate with passion the Makita hose quick-plug system. It makes the hose end HUGE and a pain to unusable for delicate work.

 

[Coen]

Exactly. I don't want any extra bulk, both length, diameter or weight in the hose end.

The hose end without is still in the catalog.

But who even wants a hose end with bypass??? The bend pipe for floor cleaning has a bypass and for sanding you just turn down the vac a bit.

 

[Crazyraceguy]

I haven't been to the local dealer in a months. We have been doing 10 hour shifts for a while now and the only time that the hours don't overlap is Thursday evenings, when the stay open 2 hours later.
I may have to do that though, a 2424 rail might be in my future.

 

[mino]

The bend pipe for floor cleaning has a bypass and for sanding you just turn down the vac a bit.

There are sanding tasks where even at low the air volume is too much and the more-important is suction consistency which cannot be provided by controlling the speed of a (heavy spinning) vac motor. It takes too long for a motor to rev up/down even if sensors had no delay.

What a bypass valve allows in vacuum-level/suction consistency cannot be provided by the vac electronics, even with an invinitely fast sensor. Bypass valve so close to the hose end allows to maintain a very consistent air suction power on the sander pad when you move over the edges of the sanded surface, when the surface is uneven etc. It is about holes being covered/not resulting in a way less of a relative air volume chnage, and thus vacuum level change the bigger the overal air channel available to the air is. This is fluid dynamics and can be handled fast-enough only mechanically using a bypass valve. Festool not offering a bypass valve made the Festool setup inferior for uneven/edge sanding situations so it is good they listened.

I.e. running the vac at 1/2 power with the bypass opened will give better suction consistency (and dust extraction) on uneven/holy surfaces than at 1/4 power without the hose bypass.

But this benefit is use-case-specific as some people sand exclusively sheet goods so almost never come across scenarios where bypass benefits them.

 

[Coen]

All the hose connections aren't airtight, so there already is a certain amount of bleed.

Either way, I don't want more clunk near the hose end.