What hose for a boom arm?

[V Elliott]

Hello again FOG!

I am finishing up the design on my next shop project and could use some technical advice on extraction hoses. I know some of you have spent a lot of time thinking about this.

I am building a swing-out, non-articulating boom arm that will end up dropping between my bench and assembly table. then swing away to be flat against the wall when not needed.

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The arm will be about 9' above the floor and about 9' long... so, that adds up to about 27' of hose.

Would you use one long hose or start large and step down?

I am thinking about using the 55mm coming out of the CT36 then stepping down to the 36mm right before entering the boom arm.

Or, will I get nearly the same performance if I just go 36mm for the whole run?

Wish I could use the 10M all-in-one from Festool (sleeve, hose, cord) but as it is tapered from 32 to 22 I think that would be too small for the TS55?

I will run both the hose and the larger plug-it cord through a Gorilla sleeve.

Thanks for the advice!

Vince

 

[guybo]

Hi, your plan for the all in one should work this from festools website[attachimg=1] guy

 

[spoonik]

I would suggest using 55 mm hose as much as you can. The larger the diameter hose the less suction you'll loose over a long run. If you can try to get non-corrugated (smooth) hose for the 55 mm. The corrugation on hoses act like little speed bumps and after a long distance they add up and will decrease the suction.

I am doing something similar with my Midi except using a 50 mm hose and then on the boom arm step down to 36 mm, still works very well over the long distance. Although I my case it's around 5 meters (16').

 

[jeffinsgf]

I could be completely off-base here, but I would test that thoroughly before spending the time and money to build something designed like that. I would be surprised if you had much suction at all after going straight up, 9 feet over and then straight down.

Piece together every section of hose you have or can borrow and see what the suction is like after 27 feet of hose.

 

[guybo]

"[member=7266]jeffinsgf[/member]" his 36ac is in another county [big grin] [attachimg=1] guy

 

[V Elliott]

If 9' up, across and down is a problem, I don't see how Festool would sell a 16' arm...

[attachimg=1]

Still, testing for myself is a solid suggestion. Trying that now...

 

[V Elliott]

Festool CT Still sucks!

Linked a 55mm, 32mm, and 27mm together (all 3.5M in length). Ran it up the wall, along the ceiling, and back down...

Worked so well I cleaned up my workbench area of all the wood chips and shavings from a forstner bit project.

 

[jeffinsgf]

I'm glad to hear that! I know there's a fundamental difference between dust collectors and vacuums, but I would have thought at least some of the "rules" applied to both.

 

[Jeff Zanin]

On the CT36 boom arm assembly there is a short 50mm hose from the vac to the handle where the arm starts, and on mine it connects to a 36mm which runs up the boom.  Works fine and I use a pigtail on the end for tools that require the smaller hose.  Likely 50mm as long as possible would be better, it would provide more volume and reduce the chance of clogging which might be awkward in your design.

Nice workshop layout & drawings.  [smile]

 

[afish]

I would hard pipe it as much as possible (I would bet money that festool one pictured is hard piped in the long straight sections. Only use a little hose near the articulation point and the drop section.  I have about 60+ feet of 2" pvc plumbed to a ridged shop vac in another building triggered off a RF remote that works like a champ.  All I hear is the air rushing through the end and since any traces of dust that could escape the shop vac is in a separate shed anyways.  I now own a CT36ac for when im forced to work on location but in the shop I still use and have no plans to replace the shop vac with the CT.  If I do anything I would get a power sensing outlet to replace the RF remote and run a dedicated line to each drop location so the shop vac would be tool activated at any of the 3 different ports but thats really far down on the priorities list for now.  The RF remote works good and since its 3 channels it also controls my shop fans the only issue is I do misplace it from time to time.