Retrofitting Dust Extraction To 14" Woodfast Bandsaw

**thumbsucker** · 19th January 2016, 03:40 PM

I am about to start the restoration of my 14" Woodfast Bandsaw.

This will be my first dust generating machine.

The first step is to consider dust extraction since the machine was manufactured without any.

From what I have read, its best to have the dust extraction as close to the point were the dust is created. Also that 150mm ducting is best.

I therefore made this cardboard mockup. It has 150mm hole located on the centre line of the blade and is as close as I can get it.

The dust hood extends beyond the current edge of the sheet metal tool so that it follows / mates with the cast iron frame of the bandsaw, while also centring the 150mm hole on the blade.

I plan to get the dust hood made from sheet metal and then to weld it to the existing sheet metal door.

I plan to have a 90º bend coming off the sheetmetal hood. That will eventually connect to my future dust extraction system.

I am looking for comments and suggestions.

Also will this single point suffice or should I add extra smaller extraction points? I was thinking maybe one on the left edge of the sheet metal door?

Also I have read that supplying enough air for the dust extractor to suck can be a issue. So I was planning to have sheetmetal section directly above the hood removed, basically the small piece that sits on the top next to the white masking tape. Is this good/bad?

I may also consider having ducting coming around the top edge of the sheet metal door and then down the right side of the door terminating just above the blade, to catch any extra dust.

Here are the photos of the mockup.

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4974-jpg

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4974-jpg

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4973-jpg

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4975-jpg

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4976-jpg

Retrofitting Dust Extraction To 14" Woodfast Bandsaw-img_4978-jpg

**BobL** · 19th January 2016, 04:03 PM

Bandsaws usually require multiple extraction points.
One place to start is the Bill Pentz website to see how it is done

Unless you have a very large dust extractor then using multiple 6" ducting results in added expenditure for relatively little gain in dust extraction so this is a case where 3 x 4" ducts will work as well.

One of the 4" ducts should be at the point you refer to in your pics.
The other is often above and in front of the timber cut .

Some people use their 3rd 4" duct to vent their bottom cabinet since no matter what is done some dust is dragged into that cabinet.
The other place worth considering is at the edge of the outfeed side of the table.

**thumbsucker** · 19th January 2016, 04:54 PM

So your saying 3 points of dust extraction would be best. Also to decrease the ducts to 4" (100mm).

As I said above am planing to run a second ducting "coming around the top edge of the sheet metal door and then down the right side of the door terminating just above the blade, to catch any extra dust as shown".

Bill Pentz also suggests ducting on the bottom left of the bandsaw. However at that point I will be limited to a 50mm ducting. Since this is the width of the door. Maybe I can make a dust hood that is say 100 mm tall and 50 mm wide that reduces to a 50mm round fitting for the ducting.

This should make it clearer as to what I am planning.

IMG_4974.jpg

As for what type of dust extraction I will get it will most likely be either cleave cyclone OR a oneida-air however I have not decided but it will be at least a 3 maybe even 5 horsepower machine.

**BobL** · 19th January 2016, 06:57 PM

A 50 mm duct in the bottom cabinet will suck very little, if the planned 150 mm (100 mm will be enough) is working right you will get very little dust in the cabinet.
The one over the top (# 3 in the diagram) should be in front of the blade
The third (#2 in the diagram)should be suspended just below the outside side of the table some sort of rectangular funnel that covers the width of the table would help collect more dust.

Here is how I would do it.

Bandsaw.jpg

**thumbsucker** · 19th January 2016, 10:24 PM

Thanks Bob

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