threading a cylinder internal

[boko]

can anyone put an internal thread on both ends of a 28mm tube the thread is 16od by 1.25 pitch cheers the wall thickness is 2mm

[hareng]

The 28mm must be the length then?

M16X1.25 bore size of tube needs to be 14.75, is it?
O/d of tube by that dimension 18.75mm?

If thats load bearing even in steel at sub 50bar its unsafe!

Smallest I can go with IR16 is 26mm bore, IR11 14.72mm bore.

[boko]

no width outside diameter . length 20 inch

[Shed tuner]

I'm confused...

If the tube OD is 28mm, and 2mm wall, then the ID is 24mm

So how can you stick a 16mm thread into a 24mm tube ?

[ELMOR FUDD]

I'm confused...

If the tube OD is 28mm, and 2mm wall, then the ID is 24mm

So how can you stick a 16mm thread into a 24mm tube ?

Got me thinking as well
I think he means M26x1.25 internal, don't ya???

[deejayuu]

Or plugged/reducers?

[boko]

Got me thinking as well
I think he means M26x1.25 internal, don't ya???

yep I am making a longer air cylinder for my s200 this might make it clearer I have some seamless hydalic pipe 28mm diameter 2mm wall thickness tested at 4500 psi and want an internal thread to take fill valve and fire valve made one befors worked a treat but sold it cheers

[ELMOR FUDD]

Or plugged/reducers?

So your wanting some end caps making to suit the cylinder which has a M26x1.25 internal thread correct?
If so then how do you want the doing?
Ie, do you require another thread inside or better still do you have a sketch/drawing of how you wsnt them and from what material and grade?

Jay

[wonky donky]

Yes it confused me too guys. I have just had a PM from Boko enquiring if I can do it. It seems it's a s200 cylinder, so it's 28mm o/d then! I can't remember what the i/d thread is off hand I would have to look it up but it isn't going to be 16x1.25, I very much doubt. IIRC the "O" ring seal is about 20x2.

Update it's to make a longer complete new cylinder for a s200 chaps

[airtech]

come on wonky donky wake up this is a piss easy job the guy wants to make a longer air tube for a s200 i have been there done that you just need a machine that will except the od of the tube then thread cut it both ends

[wonky donky]

come on wonky donky wake up this is a piss easy job the guy wants to make a longer air tube for a s200 i have been there done that you just need a machine that will except the od of the tube then thread cut it both ends

I know what he wants Carl, anyway I didn't realise you are allowed computers in a Chinese prison, when are they letting you come home? Decided to extend your holiday a bit then mate? Enjoy!

[Snooper601]

2mm wall thickness sounds too thin to me if a thread is being cut to take 200 Bsr when a plug is screwed in.

What's the wall thickness ov rhe original?

Cheers

John

[boko]

the brass ends fire valve and filler probe have long threads would like to measure air arms cylinder to see what exact thickness is or does anyone know

[ELMOR FUDD]

2mm wall thickness sounds too thin to me if a thread is being cut to take 200 Bsr when a plug is screwed in.

What's the wall thickness ov rhe original?

Cheers

John

I agree John,2mm is a bit thin but Boko hasn't said what tube he's using and material grade and spec.
Hope you keeping well bud it's been a while?

Jay

[hareng]

Using steel hydraulic tube 28x2

Absolute no brainer with around 1.1mm wall excluding clearance after threading. Not even gonna bother working psi out but will guarantee I can bost it.