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Making dust extraction pipe adaptors

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Making dust extraction pipe adaptors

Postby 9fingers » 26 Feb 2021, 18:01

Hardly any time seems to go by between seeing people search for adaptors to fit one size of extraction port to another.
I've a simple method using scraps of pipe that people might already have or can scrounge on freecycle etc

I've picked near random requirement to adapt from 22mm to 57mm just for the sake of an example.
Pick a solvent weld UPVC pipe size somewhere in the range but ideally near the upper size.

Cut a number of pieces say about 30mm long. split one lengthwise.

I apologise for the grotty state of the pipe - its been lying in the garden for some years. you can use any colour you like not just green :lol:

IMG_2936.JPG
(631.19 KiB)


Make a second cut to nibble out a small piece.

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(633.55 KiB)


Fit the piece into the end of a piece of the same pipe.

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(281.61 KiB)


Repeat the process cutting a bit more out this time

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(340.16 KiB)


And again

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(631.81 KiB)


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(330.74 KiB)


Get the idea? one more time

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(649.2 KiB)


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(370.82 KiB)


Now offer it up to the 22mm pipe

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(384.98 KiB)


All those little bits you cut out can also come in useful if you want to increase the diameter

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Split another piece

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Fit it over the pipe this time and you will be left with a gap.

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(416.21 KiB)


Sort through the offcuts and pick/trim a piece to fit in

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the end view looks like this

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Final outside diameter

final diameter.jpg
(113.35 KiB)



Obviously you can repeat the process to increase the OD if needed.

Take all the parts out placing them in order. put a smear of solvent weld cement on the inside of the pipe and insert the first piece and repeat to fully assemble the adaptor make sure none of the cuts line up. Add the outer layers in the same way. clamp with tape or a jubilee clip and allow to dry.

Hope this helps

Bob
Information on induction motors here
https://drive.google.com/file/d/1dBTVXx ... sp=sharing
Email:motors@minchin.org.uk
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Re: Making dust extraction pipe adaptors

Postby TrimTheKing » 01 Mar 2021, 17:29

Very clever solution Bob, thanks.
Cheers
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Re: Making dust extraction pipe adaptors

Postby RogerS » 01 Mar 2021, 18:21

Good dodge, Bob. It even works out for soil pipes as I found out in our downstairs toilet. Long story short, the soil pipe sticking into the room was too short by about 2". I cut a 2" piece of some spare pipe, and a separate 1" piece. I slit the 1" piece which then allowed me to slip it over as coupling for the 2" piece to the main pipe. Another small piece filled the gap. Glued it all up ensuring the gap was at the top and job done.
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Re: Making dust extraction pipe adaptors

Postby novocaine » 01 Mar 2021, 22:29

Neat trick. Can i use it to make my plumbing bigger or is it only suitable for something that is at least close to an acceptable size?
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Re: Making dust extraction pipe adaptors

Postby 9fingers » 02 Mar 2021, 09:22

novocaine wrote:Neat trick. Can i use it to make my plumbing bigger or is it only suitable for something that is at least close to an acceptable size?


You can go up and down on the stock size as I’ve shown. Need to keep in mind the effect on flow if to goes towards the smaller diameter.
Diameter changes by 2*pi*wall thickness for each step. If need to make a huge change to diameter then perhaps change the stock you cut the bodging pieces from won’t cover say 60% of the circumference and you might need some heat to relax the plastic to take up the new radius.

Bob
Information on induction motors here
https://drive.google.com/file/d/1dBTVXx ... sp=sharing
Email:motors@minchin.org.uk
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Re: Making dust extraction pipe adaptors

Postby novocaine » 02 Mar 2021, 13:37

I'll ask the wife if she's happy with my home bodge increase to the plumbing. :shock:
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Re: Making dust extraction pipe adaptors

Postby Chris101 » 17 Mar 2021, 21:23

If you have a belt sander you can fine tune the Outside Diameter. *handy hint, I've got better results by sanding along the length and turning manually than trying to reduce the OD by 'turning' the pipe as if on a lathe. What happens is you get a build up of spoil at the bottom that is easily trimmed by stanley while warm. If you try to 'lathe it', for want of better explanation it heats up and smudges the clean fit as the waste has nowhere to go and it bulges in minor ways that aren't as tidy. *Quiet at the back, We can hear you giggling.

Funny enough I just finished one for the vax sound box yesterday. I'll take a pic tomorrow if I can remember.
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