Which dust hose?

[BearTricks]

I have a Record Dual Motor Cam Vac with a 100mm hose which works fine for my planer and bandsaw.

I have a tracksaw, sander, and a couple of routers all with the same size outlets (32mm off the top of my head) so need a smaller hose and adaptors. 3m is plenty long enough. Conventional wisdom seems to say you should reduce your hose as close to the tool as possible, but I think a 100mm hose reduced at the tool would be a bit unwieldy

Which type of hose is best? My 100mm hose is the clear PU with the copper wire which always feels a bit flimsy. I also have an old Numatic Henry hose which is a bit knackered. I do use this for my smaller tools at the moment but I’d prefer to leave this on the Henry in the house for cleaning up after building and decorating.

Maybe I’m over thinking this but options seem to be either 32mm crushproof with a smooth interior or 51mm clear PU with wire versions. Would the larger size of the 51mm outweigh the fact it isn’t smooth interior, and would I get away with attaching it to 30-something mm outlets using a reducer without it being to difficult to manoeuvre around my workbench? Fixed ducting isn’t an option at the moment.

 

[Spectric]

If you have a henry (Numatic) then take a look at

https://centraltechnologysystems.co...th-five-piece-power-tool-adaptor-set-19-58mm/

They do hose and various adaptors.

 

[Sideways]

If you look at any single motor top brand shop vac, the biggest dia hose that you will find them ship with is 36m dia. They work well at that, and of course with smaller diameters like 32, 27mm, etc.
Scale up this size of hose, pro rata, for a 2 motor extractor with double the airflow and you'll realise 50mm hose is a good match to a 2 motor machine. 50mm has 1.9x the area of 36mm, near enough double the motors - double the area.
(I have tried a 50mm hose attached to my own Nilfisk single motor, industrial shop vac, this hose is too big for single motor and has low airflow in the hose. 27, 32 and 36mm hoses all work well.

The problem with using 100mm hose on the camvac is that the airflow is spread out over 4x the area of a 50mm hose and so the air speed in the hose drops to about a quarter. Without air speed, there is a tendency for debris to settle in the hose and the airspeed is too slow to carry heavier debris uphill through vertical sections of the hose.

So there is your answer. The 100mm hose is not ideal. If you are using the vac on a machine with a 100m outlet, you're using the wrong vac for the machine, yours won't make enough airflow whatever you do.
To best match your vac in two motor mode get a 50mm dia hose, smooth bore as possible.
For your tracksaw and routers, 3 metres of 32 or 36mm vac hose all the way from the camvac will do fine and you don't even need to turn on the 2nd motor.

 

[RobNichols]

I have a Camvac. For connection to smaller units I use the Record Power DX1500B 100-32mm Reducer 2m hose. It's very convenient and works a treat. The connector is a great fit for my old style CamVac which made swapping between it and the 100mm connector to my bandsaw fairly quick and easy. However recently I've got some Rutland magnetic connectors and that's made switching between the two really quick and easy. In fact as my cyclone unit is a cheap unit with 36mm inlet so most of my devices connect via the DX1500B including my thicknesser. With both motors running I get more than enough suckage for e everything I connect via that setup.

 

[Ross Buchanan]

I have a Camvac. For connection to smaller units I use the Record Power DX1500B 100-32mm Reducer 2m hose. It's very convenient and works a treat. The connector is a great fit for my old style CamVac which made swapping between it and the 100mm connector to my bandsaw fairly quick and easy. However recently I've got some Rutland magnetic connectors and that's made switching between the two really quick and easy. In fact as my cyclone unit is a cheap unit with 36mm inlet so most of my devices connect via the DX1500B including my thicknesser. With both motors running I get more than enough suckage for e everything I connect via that setup.

Satisfied with the magnetic connectors? Would you recommend them?

 

[HamsterJam]

I have an older style Camvac with the 50mm port (before they went to 100mm) and use a Festool hose for my portable power tools.
The wide end fits into the Camvac port directly and the 32mm end fits most of my power tools (I have 3D printed a couple of adaptors for those it doesn’t).

 

[RobNichols]

Satisfied with the magnetic connectors? Would you recommend them?

Yes and yes. They've worked well for me.

 

[Sachakins]

Feed the Camvac hose you use into a manifold, with outputs for the sizes you need on a sliding gate.

This sort of idea,

 

[BearTricks]

If you look at any single motor top brand shop vac, the biggest dia hose that you will find them ship with is 36m dia. They work well at that, and of course with smaller diameters like 32, 27mm, etc.
Scale up this size of hose, pro rata, for a 2 motor extractor with double the airflow and you'll realise 50mm hose is a good match to a 2 motor machine. 50mm has 1.9x the area of 36mm, near enough double the motors - double the area.
(I have tried a 50mm hose attached to my own Nilfisk single motor, industrial shop vac, this hose is too big for single motor and has low airflow in the hose. 27, 32 and 36mm hoses all work well.

The problem with using 100mm hose on the camvac is that the airflow is spread out over 4x the area of a 50mm hose and so the air speed in the hose drops to about a quarter. Without air speed, there is a tendency for debris to settle in the hose and the airspeed is too slow to carry heavier debris uphill through vertical sections of the hose.

So there is your answer. The 100mm hose is not ideal. If you are using the vac on a machine with a 100m outlet, you're using the wrong vac for the machine, yours won't make enough airflow whatever you do.
To best match your vac in two motor mode get a 50mm dia hose, smooth bore as possible.
For your tracksaw and routers, 3 metres of 32 or 36mm vac hose all the way from the camvac will do fine and you don't even need to turn on the 2nd motor.

I think this is probably the advice I was looking for. Charnwood seem to do the same 50mm hose and fittings as everywhere else at a slightly better price so looks like I’m getting a delivery of assorted bits and pieces.

I’ll spring for magnetic if the push fit connectors aren’t doing it for me.

Thanks everyone.