Stupid extraction question....

[Jacob]

I'd have pipe same size throughout (or larger) same as the extractor inlet diameter , and only reduce it to fit the machines at the last possible point.

 

[BTR]

I use the soil pipe as 9 fingers has said and use axi blast gates to run 4" flexi hose to all my machines i have different outlets the blast gates are easily fitted useing expanding glue or you can use duct tape wraped around the blast gate and push it up into the soil pipe for a tight fit.

 

[studders]

.....or you can use duct tape wraped around the blast gate and push it up into the soil pipe for a tight fit.

Tried that, got bored winding, testing fit, and winding, testing fit, and winding.......
Will give some PU that I have a try, should be a goer.

 

[stuartpaul]

Thanks for the responses.

Looks like my 'bargin' extraction trunking won't turn out to be quite the bargin if I have to spend considerably more on the extractor :shock:

However, I did have a sneaking suspicion along the lines of what Mark said, - hence the question in the first place.

May think about using 110 mm as the main line and then drop down to the machines with 63 mm?

 

[Wood Monkey]

I'm with Mark regarding which extractor is suitable for a 2.5in ducted system. The HVLP 'inflatable bag' type do not work if the flow is restricted. The bag just collapses.

I've got a Record DX4000 and use it with 100mm loose pipe which is about 20 feet long or a short 100mm to the table saw. I've also got a step down adaptor and a 2.5in pipe about 20 feet long but this generally gets used for cleaning up with workshop.

In my experience the vacuum type extractors, such as the DX or the Axi that Mark linked to, thrive on with the smaller pipe as the airflow is so fast - I've had to recover many pencils and small tools out of the DX...!

I've also use the Woodstar DC04 and as very impressed for the size and cost. Screwfix are listing for about £100 and in my opinion this would be a good option for a small bore ducted set-up and could be upgraded in the future if required.

The only think that lets the DX down is that it's a PITA to empty and clean out.

Jon

 

[Krysstel]

All the advise I've been given and read regardiing HVLP extractors says use the biggest size pipework possible for as long as possible. This thread shows what I've used over a total length of 13m https://www.ukworkshop.co.uk/forums/extraction-lvhp-chip-hvlp-dust-or-both-t56466.html?hilit=HVLP.
I'm planning self made blastgates made from a 9mm MDF plate sandwiched between 12mm MDF. One side will be a stub of 110mm soil pipe which will connect directly to the 110mm soil pipe I've used for most of the pipework. The other side of the BG will be half an Axminster splice which I'll then connect flexihose directly to. These : http://www.axminster.co.uk/axminster-hose-joiners-prod22310/. Hopefully the BGs will be both cheaper and better than bought alternatives and save me also needing adaptors between solid pipework and flexi. I'll probably post back after the new year with details about how I end up making the BGs.

Mark

 

[johnf]

Use blast gates like this dead easy to make and use just cut a slot halfway though the pipe and slot in the plastic ring covers the slot when not in use

 

[MickCheese]

or is it?

I'm going to equip with 'proper' extraction this year and managed to get a very good deal from Rutlands on the 2 1/2 inch plastic 'trunking'.

All I need now is a good extractor to connect it all up to. Looking at 4 collection points, - none will be to a planer type machine so no big chippings going through this bit of the system (separate set up).

Axminster have this one at £175 and 1,200 cubic metres per hour http://www.axminster.co.uk/axminster-ax ... prod21167/

and this one at £160 and 2,000 cubic metres per hour http://www.axminster.co.uk/axminster-ax ... rod861355/

The second one seems a better deal as it's cheaper and shifts more air but I've been caught out on this sort of thing before.

So, - anyone know better about the physics of this stuff?

All help appreciated.

Thanks

Stuart

The first one from Axminster you are looking at is due to rise in price by £101.63 and the second by £71.35 on the 3rd January.

Have a look here for their price comparator.

http://www.axminsternet.com/pricecomparison/result.php?sku=718892

Mick

 

[Giff]

...and just to make sure we are paying attention and not going into a discount frenzy the Axminster diamond bench stone is reduced to £23.95...it was £24 before so we save 5p !! Geoff