Vac Hose Length, Gravity and Suction Settings

[Neill]

In my basement shop I screwed a large, vinyl coated hook into the I-beam above my MFT-3.  My thought was to loop my CT-22 hose and tool cord through the hook to keep them out of the way while in use.  The only problem was that the standard 3.5 meter hose was not long enough.  I special ordered the 5 meter, 27mm diameter non antistatic hose which I got yesterday.  The length is perfect, even allowing a bit of slack.  I also like the more flexible hose for this purpose.

I guess I could just experiment, but what the heck, I am at work and it's a slow day, so I will pose this question...

I normally have been keeping my suction at a minimum, particularly when using the sanders.  Now that I have set up this new configuration, do I have to increase the suction to allow for (a) the longer hose and (b) the additional lift required to overcome the gravity of the hose hanging down from the rafters?

Neill

 

[ForumMFG]

Neill,

I can't give you the answer you want to hear but the most obvious answer is to to trial and error.  Try it out and make adjustments as needed.

 

[Neill]

Just a follow-up to my own post.  I have noticed no appreciable adjustment necessary to the vacuum setting despite the longer hose and lift required.  It all works very well.  I keep my hose and electrical cords out of the way.

Neill

 

[greg mann]

Makes sense. Gravity is probably no issue because you have pretty much pretty much the same volume of air going down as up (and air is nuetral in weight relative to air. I think.  :-\). The longer hose will have more resistance due to friction but I also think this would be very hard to detect relative to other variables in a sanding operation, like grit size and condition. There is more subjectivity built into this than you have ability rule out.