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Forum Index : Windmills : Pipe in pipe swivel - diameters?
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| domwild Guru  Joined: 16/12/2005 Location: AustraliaPosts: 873 |
Hi, The mill head slides onto the pipe, which might just have the same dia as the mast. What I have noticed, at least with the pipes I have accumulated that there is a noticeable gap. From memory the larger pipe has an ID of 52mm and the OD of the smaller pipe is 49mm. With those imperial pipe sizes is this a common thing and how do I get around it? Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up. Winston Churchill |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Don Yeah thats pretty typical, very few standard sized sections will be a neat fit into the next size up. Its just the way of things. What you have to do is make a sleeve to fill the gap. You could roll one from some 1mm steel plate ( not stainless! ), or see if you get use a short length of 50mm exhaust tube, cut longways. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Hi Crew ,, I used a length of plumbers plastic pipe or swimming pool filter pipe or other plastic pipe --there are heaps of different sizes available, I get the nearest oversize and slit it lengthways, cut out the parallel "too wide" piece and lubricate it and the pipe with silicon grease.. have done a few and they work well. Bruce Bushboy |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
Hi Dom, For a one off job it might be worth getting a bush turned up on a lathe. I make my own bushings mostly from high density polyethylene. I prefer to make the bush wall at least 3 mm so it has reasonable stiffness and build a slight interference fit to the outer sleeve. It wont work if the pipe has a welded seam or the pipe is not round as it will distort the bushing and grab the inner shaft, probably better to use tube. The way I have done it in the past if I have more than 20 to make and want to save time and cost, is use some off the shelf bits. start with the bush, metric and imperial (rural) poly water pipe gives a variety of sizes and wall thicknesses. The poly pipe labelled as HDPE or PE100 is better than the softer stuff. Metric is measured on the outside diameter and rural is measured on the inside diameter. I then press fit some poly into a standard steel tube size and take a measurement of the inside diameter after it has been squeezed. If I am lucky there will be a heavy walled tube or shaft that will fit straight in, if not, minimal lathe work will be needed. cheers yahoo I'm confused, no wait... maybe I'm not... |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Most of you will already know this, but pipe is for conveying fluids, and is measured by it's inside diameter, and is very frequently manufactured slightly oversize. Tube is always structural, and measured by it's outside diameter, which is usually quite accurate. Cheers, Tony. |
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| domwild Guru Joined: 16/12/2005 Location: AustraliaPosts: 873 |
The exhaust pipe was 2mm thick and the diff. between 48mm (OD) and 52mm (ID) was 4mm, so even after slotting it stopped the yawing pipe from turning. Found another solution: As I had several 4.8mm SS pop rivets left over from the props I used them at the top and bottom of the inner pipe and it left only a small gap. Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up. Winston Churchill |
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