Thread: Converting drum sander to 4" outlet.

Thanks for the update drawing Bob.
Kryn

Thanks Kryn good to know [emoji106]


Acoustic & Electric Bass Guitars
Neptune’s Guitars - Master Luthiers

Originally Posted by BobL

My experience with the mens 24" shed drum sander has been ordinary.

When I did a quick and dirty assessment of this the sander, despite the full grunt of the Clearvue behind it and 2 x 100 mm ducts the air flow with a 12" wide pice of wood passing through the sander was < 200 CFM.
I wanted to cut a 150 mm opening in the top but with the machine still under warranty I didn't do that instead I will, eventually make a completely new cover for it

What I found was that bugger all air entered the sander (B and A in diagram below) especially through the smaller gap between the wood and the sander cover plate.
On that diagram that meant air flow A and B was almost non existent.
The drum does drag air (C) around from B to A - not so much where there is wood but where there is no wood passing through the machine - this scavenges and allows fine and visible dust to escape out of either side of the wood.

Breaking the C flow does make a lot of sense but unless D and E are increased there is no way that enough air will enter the sander.
The gaps at A and B should ideally be made bigger but failing that openings at F & G will at least manage the fine dust a little better.

Attachment 413963

The above is really useful.

Thinking about this some more, perhaps the enhanced air flow needs to come from behind the drum -- at point G -- where the laminar flow (around the drum) -- arrow C -- hits the rear hold down roller and then the board being sanded. In principle this would be akin to extracting dust from the front of the overhead guard on a table saw.

I have on of the old Performax 22-44 radial arm saw attachments put on the later three footed stands with the sanding belt feed platen. It came with a plastic shroud that was basically like a section of 6" plastic pipe with a single hole to put a 2" vacuum cleaner hose on. Needless to say it isn't very effective. Ian it does have spring loaded metal rollers by the way. When I get to redoing it I will make a bigger hood to accept a 6" pipe and make it sit out from the drum a couple inches more with flairs front and back resembling a Bowler hat stretched 24". The frame makes it too hard to stay tight to the drum anyway. I'm of the mind with more air coming in through a smoother bigger slot front and back above the wood that all the dust should be captured and pulled into the ducting similar to the bell mouth floor sweeper vacuum that Bob played with for his Men's Shed. With the OP's sander he could also make the "long Bowler Hat" to fit outside his frame to do the same without the chance of compromising the casting with holes. Suction can be fine tuned by raising and lowering the hood to optimize the gap around the bottom.

Pete

I was thinking that much of the discussion is for putting full width boards through. I dont do this too often, so this leaves more gap on each side.

The mod to add a 4/6" collector makes sense. The 2" on mine is utterly useless.

Does anyone know the name of the product, that looks like strips of bristles from a banister brush?? I'm another one that won't be running wide boards through the sander, and thinking of putting this product around the edge to maximize the efficiency. Would this be a good idea?
Kryn

Whip some off the wheel wells of the number five bus Kryn. [emoji1]


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Do you mean these e.g. Truck mudguard splash guards
Bristle Guard edges for dust collector hoods and guards

I did'n't buy it but at the time it cost ~$36/m + shipping from a truck parts store. From one of the 1m long x 100 mm wide strips your an make another metre of the stuff for about $10 with of Al micro-U channel so the over all cost is ~$23/m
There is also he sawtache from Timbecon from $53/m in 300 mm strips
https://www.timbecon.com.au/extracti...t-hood-shrouds

I've use this stuff on my TS guard for some 4 years - success level was good but my new guard is better.
I was going to fit the bristle to my new guard but I'm finding it does not need it.


Whatever you do you have to let air into the system and using these bristly guards have to be used judiciously otherwise they can block air from entering a machine.

Cal we don't have a number 5 bus around here. They don't have them on here anyway.
Thanks for that info Bob, I might give it a miss then, if it has to allow air in there's a chance dust can come out.
Kryn

Originally Posted by KBs PensNmore

Cal we don't have a number 5 bus around here. They don't have them on here anyway.
Thanks for that info Bob, I might give it a miss then, if it has to allow air in there's a chance dust can come out.
Kryn

I think they still have use - just ned t make sure enough air gets in to sweep the dust out.

Originally Posted by KBs PensNmore

Does anyone know the name of the product, that looks like strips of bristles from a banister brush?? I'm another one that won't be running wide boards through the sander, and thinking of putting this product around the edge to maximize the efficiency. Would this be a good idea?
Kryn

Raven make a self adhesive door brush strip. $18 for a 915mm strip at Bunnings. RP83 - Self Adhesive Brush Strip Seal 915mm (Brown)

Originally Posted by richmond68

Raven make a self adhesive door brush strip. $18 for a 915mm strip at Bunnings. RP83 - Self Adhesive Brush Strip Seal 915mm (Brown)

It stops bushfire embers, apparently. I'll feel better having it on my door next time Armageddon strikes.

Insects too... but those pesky Huntsmans are crafty buggers.

I reckon those door brush strips might be a bit on the stiff side to use in that capacity.

You're right about that Bob, I found the leftover off cut in the shed and it's only 19mm bristles. The one I was thinking of when I suggested that was the 50mm brush seal I got from DSA up in Brisbane. They have just the brush by itself or in an extrusion, in up to 3 metre lengths.

Bunnings sell a similar item as a garage door seal. https://www.bunnings.com.au/moroday-...-seal_p4062458