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single stage DCs anyone convert the 5" opening to 6" was it worth it?

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Forum topic by juicegoose posted 09-16-2010 09:09 PM 847 views 0 times favorited 6 replies Add to Favorites Watch
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juicegoose

116 posts in 2522 days


09-16-2010 09:09 PM

After reading more and more on dust collection and getting my 50-760 last night I thought about thinking of ways to convert the 5” inlet opening to 6”. Has anyone done or known anyone thats done this? I’m not talking about putting a 5”-6” reducer/enlarger on the fitting but cutting the hole bigger. Would running 6” pipe be to much for the collector? certainly with these single stage machines if you put to large a hose on machine you’ll deminish your returns. Just a thought. I’d love to run 6” line from the collector but delta gave it a 5” opening for a reason. Additionally after reading the fine woodworking article in which they tested all the machines, the other two top winners both had 6” opening and the loss of cfm started much sooner as static pressure was increased.


6 replies so far

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8iowa

1546 posts in 3221 days


#1 posted 09-16-2010 10:02 PM

One of the things that a dust collector must do is keep the velocity in the pipe above 3500 cu ft per min in order to keep the dust particles suspended in the tuburlent airstream. When you enlarge your pipes from 5 to 6 inches, the velocity will fall proportionally by the square of the difference in diameter. This may cause dust and chips to accumulate in the piping system before it gets to the collector.

It would seem to many that the “bigger the pipe” the “better the flow”, but this is not the case. Just the opposite is true.

-- "Heaven is North of the Bridge"

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juicegoose

116 posts in 2522 days


#2 posted 09-16-2010 10:25 PM

Thats exactly what I figured

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zzzzdoc

526 posts in 2463 days


#3 posted 09-23-2010 12:18 AM

I enlarged my HF DC inlet to 6” from 5”. It noticeably increases the flow.

Many DC have their inlets reduced in size to decrease the amperage that the DC will pull. Also increases the life of the motor / prevents premature motor burnout.

But the HF DC is so cheap, several of us have done this with great success.

-- Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

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brtech

893 posts in 2383 days


#4 posted 09-23-2010 05:06 AM

zzzzdoc, do you have a thread, or can you post pictures of this mod?

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8iowa

1546 posts in 3221 days


#5 posted 09-23-2010 02:55 PM

Another common mis-conception is that enlarging the inlet on a blower will reduce the motor load, when just the opposit is the case.

An AC induction motor has a very flat speed – torque curve. When you increase the diameter of the pipe you are causing the motor to “reach out” to a point on the curve where it will be drawing more than the full load nameplate amperage. This may be OK for a cutting tool, where the overload is brief, but if the motor is required to operate continuously on overload it will rise to a temperature that exceeds the limit of the insulation. Motor life can be shortened considerably.

Most motors today have class B insulation which is rated at a 60 degree C temperature rise over a 40 degree C ambient. Even at this, the surface of the motor can be too hot to handle with your bare hands. If you place the dust collector in it’s own enclosure, where ventilation is limited, how hot do you want the motor to be?

-- "Heaven is North of the Bridge"

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zzzzdoc

526 posts in 2463 days


#6 posted 09-24-2010 05:39 AM

Here’s a quick picture of the modification. It’s part of a 6” Thien separator modification.

Picture of HF Inlet Modification

Not sure if you’re allowed to cross post (if not, moderator please remove the link):
“Modified HF DC with 6 Thien Separator

-- Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

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