Author Topic: 2 vacuums  (Read 2553 times)

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Offline alice

  • Posts: 81
2 vacuums
« on: September 11, 2018, 09:20 AM »
Has anyone doubled up their vacuums? Lots of suction. Do you think it would harm anything on vacuums?

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Offline Michael Kellough

  • Posts: 3603
Re: 2 vacuums
« Reply #1 on: September 11, 2018, 09:31 AM »
Not me, but shouldn’t cause any harm.

Try to get rid of that right angle fitting and use a larger diameter hose to the saw for better performance. Might not need to double up then?

Online Bohdan

  • Posts: 889
Re: 2 vacuums
« Reply #2 on: September 11, 2018, 09:39 AM »
The short larger hose direct from the saw to the bottom vac only would probably give a larger air flow than the two put together.

Offline aloysius

  • Posts: 320
Re: 2 vacuums
« Reply #3 on: September 11, 2018, 09:47 AM »
I'm interested to understand why you find it necessary?
FOG-wit since '95:  Some say since birth...

Offline alice

  • Posts: 81
Re: 2 vacuums
« Reply #4 on: September 11, 2018, 09:51 AM »
It was just a experiment people thats the reason for some of fittings that’s all I had . Definitely a lot more suction.

Offline Vondawg

  • Posts: 232
Re: 2 vacuums
« Reply #5 on: September 11, 2018, 10:11 AM »
Yeah...I fail to see the advantage of all that mess, especially considering the port size at the saw itself...it must even whistle
There are no mistakes....just new designs.

Online SRSemenza

  • Global Moderator
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  • Posts: 8640
  • Finger Lakes Region, NY State , USA
Re: 2 vacuums
« Reply #6 on: September 11, 2018, 10:15 AM »
I haven't connected two to a single hose but I have stacked the CT-SYS on a Mini for a compact way to have two vacs on site.

Seth

Offline jpmeunier

  • Posts: 69
Re: 2 vacuums
« Reply #7 on: September 11, 2018, 10:24 AM »
Per the Hagen Poiseuille equation, you're going to get a dramatically bigger effect from increasing hose diameter, and a reduction in hose length. Without doing any quick calculations, not sure how close you would be to choke flow (Point at which an increase in pressure does not provide an increase in flow) with a dual DC setup, but I can guarantee that the benefit will be larger shortening your hose.

Offline alice

  • Posts: 81
Re: 2 vacuums
« Reply #8 on: September 11, 2018, 10:31 AM »
No whistle.Big difference when cutting mdf. Not to good with quarter round sucks up off cuts

Offline alice

  • Posts: 81
Re: 2 vacuums
« Reply #9 on: September 11, 2018, 10:36 AM »
It would be great if you were trimming in someone’s house and you were concerned about dust.

Offline guydot

  • Posts: 20
Re: 2 vacuums
« Reply #10 on: October 08, 2018, 11:53 AM »
I am looking for a source for a short hose between the Festool Vac and an Oneida Dust Deputy. Where did you get the hoses and fittings?

Offline Svar

  • Posts: 1553
Re: 2 vacuums
« Reply #11 on: October 08, 2018, 01:03 PM »
Connecting two vacuums in parallel does not increase suction (static pressure). It increases throughput. Which is mostly negated by a narrow hose that follows. You can also run into problems if you connect two vacs with very different SP and/or throughput.
Connecting two vacs in series will increase SP.

A good analogy to this is connecting batteries in parallel and series.

Offline Birdhunter

  • Posts: 2382
  • Woodworker, Sportsman, Retired
Re: 2 vacuums
« Reply #12 on: October 08, 2018, 01:12 PM »
On my Kapex setup, going to a larger diameter short hose greatly improved collection compared to the long narrow standard hose. On 90 degree cuts, collection is almost perfect. I have a Festool vac nestled under the UG stand.
Birdhunter