Sleeve for a tube

[puffernutter]

Last year when upgrading the garden I installed a garden light on a round post. The post is 76mm in dia and 4mm thick. The lights were cheap on Facebook, but boy are they bright. They are actually street lights and there is a lot of spill-over into neighbours gardens.

Last weekend I installed an LED street light at the bottom of the garden and whilst just as bright, there is far less spill over. So, I plan to install 2 x LED street lights in place of the current one.

The existing light just drops on the 76mm tube. The LED ones need horizontal 50mm tubes.

What I though I would do as I need the LEDs to be in slightly different angles (not 180 degrees) and I also need to raise the height of the tube, is to sleeve it and then have each LED light so it can rotate.

After that long explanation, herein lies my problem. With a 76mm tube and 4mm wall, I need a sleeve of OD 68mm, but that doesn't seem to exist. Nearest I can get is 63.5mm and that's a little too much slop.

You are clever people - any thoughts how I can fit a sleeve inside?

Cheers

Peter

 

[Shox Dr]

Access to a roller?

 

[Paul.]

Just roll a shim from 2.5 or 3mm sheet depending on how tight you want it, it doesn't have to be a full circle, leave a 10mm to 20mm ish gap and make it so that its a spring fit either on the inner or inside the outer,
I've done it a few times.

 

[ukracer]

Last year when upgrading the garden I installed a garden light on a round post. The post is 76mm in dia and 4mm thick. The lights were cheap on Facebook, but boy are they bright. They are actually street lights and there is a lot of spill-over into neighbours gardens.

Last weekend I installed an LED street light at the bottom of the garden and whilst just as bright, there is far less spill over. So, I plan to install 2 x LED street lights in place of the current one.

The existing light just drops on the 76mm tube. The LED ones need horizontal 50mm tubes.

What I though I would do as I need the LEDs to be in slightly different angles (not 180 degrees) and I also need to raise the height of the tube, is to sleeve it and then have each LED light so it can rotate.

After that long explanation, herein lies my problem. With a 76mm tube and 4mm wall, I need a sleeve of OD 68mm, but that doesn't seem to exist. Nearest I can get is 63.5mm and that's a little too much slop.

You are clever people - any thoughts how I can fit a sleeve inside?

Cheers

Peter

2 sleeves..

 

[puffernutter]

Access to a roller?

Nope - just missed out on one here!

 

[Tupers]

Can you post up a picture of how where the two pieces need to join? Does the ID of the 68mm sleeve matter? I’ve gotten a bit lost trying to imagine what you’re descending.

 

[puffernutter]

Does this help. Sorry I have no CAD!

 

[DAPPH]

Ask one your Maker friends if they can 3D print a tube in ABS for you for beer tokens ? Though I'd not bother just use tape to make the ends the right size and dribble self expanding Gorilla glue over the smaller tube after giving it a very light coating of butter then spray it with water to start the glue expanding and bung it in the bigger tube asap

I found you can make up nearly /4 inch of packing doing this … did it nearly four years go it's still in place .

 

[ukracer]

Does this help. Sorry I have no CAD!

Photo is blurry mate...

 

[puffernutter]

Photo is blurry mate...

It zooms up fine for me if you click on it and zoom?

 

[ukracer]

It zooms up fine for me if you click on it and zoom?

Lol yes you are correct. Lol

 

[mr haynes]

If steel, tack in adaptor to size you can use?
Bend strips of thin steel around pipe for shimming

 

[puffernutter]

So I think a 2mm piece of steel rolled around the 63mm OD tube should do.

Need to find a set of rolls!

Cheers

Peter

 

[nickk]

Of you were near me I would willingly roll it from 2mm,but just get some 0.9/1mm and wrap it around twice,hold it from springing with adhesive tape,bung it in quick,it will self tension.

 

[hotponyshoes]

I have a little set of rolls if you want to borrow them, I expect the max is only about 1mm but you could make a few and put them inside each other?

Or I could print it or I have some prototyping nylon (like tough polymorph) you could push into a former

 

[hotponyshoes]

Got this with 4mm wall, cut a slot out the length and squeeze it up and weld it.

Or I have some 63.5 that you could slot, open out, fill the gap with weld.

 

[Hitch]

Stitch 3 bits of flat or round inside the extension...?

 

[Tupers]

I’ll have a play with my little slip roll and some 2mm plate and see what I can do.

 

[puffernutter]

All, thanks. Sorry, I wasn't being told of any updates and hadn't seen these replies. If my maths is correct, the inside circumference of a 76mm OD, 4mm wall is 213.6mm. The outside circumference of a 63.5mm OD tube is 199.5mm.

So I will need roughly a piece of steel 14mm wide in that gap (plus whatever metal comes out in the cutting process) to have a reasonable fit.

 

[puffernutter]

I’ll have a play with my little slip roll and some 2mm plate and see what I can do.

Thank you, that would be appreciated.