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Forum topic by MikeDe posted 578 days ago 591 views 0 times favorited 4 replies Add to Favorites Watch
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MikeDe

34 posts in 1323 days


578 days ago

Topic tags/keywords: question tip

I am building a dust collection system for my
table saw. I have it just about complete, all
I have left to do is to build a blade guard with
a dust port. I can build one with a 3 inch or 4 inch
port in it and I would like some feedback on witch
would be the best size.
The system starts at a 6 inch line from the cyclone
and ends with a 4 inch line at the saw.
It will have a 3 foot piece of flex at the end that will
attach to the blade guard. This 3 foot piece can be
either 3 or 4 inch diameter. I have been told that the
3 inch hose would have more velocity at the end than
the 4 inch and wound be better for picking up the
sawdust that comes up the back side of the blade.
What do you guys think?


4 replies so far

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JesseTutt

803 posts in 742 days


#1 posted 578 days ago

I don’t have a reason to back this up but I would go with the 3”.

-- Jesse, Saint Louis, Missouri

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CrazeeTxn

150 posts in 582 days


#2 posted 578 days ago

How would 4” affect the guards ability to actually work? That would be one good sized guard to accomodate a 4” hole. How about a 2 1/2” at the guard and Y from the 4” to that?

View Fred Hargis's profile

Fred Hargis

1728 posts in 1125 days


#3 posted 578 days ago

I’ve had the 4” Shark Gaurd, and changed it to an Excalibur overarm that has a 3” pickup. On my system, the 4” Shark was much better at catching the dust than the 3” Excalibur. Some of that would be attributed to the basket design, I think, but I suspect most of it is just the better air flow through the 4”. They were both hooked to a 6” line that was powered by a 5HP cyclone. That said, the performance of the 3” Excalibur isn’t terrible….just not as good as the 4” Shark.

-- Our village hasn't lost it's idiot, we sent 'em to Washington.

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AandCstyle

1287 posts in 888 days


#4 posted 577 days ago

The area of your 6” trunk line is about 28 square inches. The area of 2 4” feeds is about 25 square inches. The 4” line will cause less turbulence, hence greater air flow. I have a 6” trunk to my TS with 6” all the way to the dust port where it is reduced to 4” and a 5” flex tube to a Shard Guard with a reducer to 4”. So to answer your question, I would use 4” to the blade guard. HTH

-- Art

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