60mm steel pipes anyone?

[Roman Valls]

Hello CCHS,

I would like to build a contraption/tool with a 60mm pipe and I checked suppliers nearby:

http://www.steelsolutions.com.au/

Unfortunately they close soon today, so I decided to give it a try here and see if:

1) Someone knows where I can find alternative raw material sources.

2) It would be awesome if someone with experience with the metal lathe can teach me should I need to bring the diameter down to 55mm and do other minor tweaks?

3) Someone is available and willing to help out at the HS today or tomorrow?

Thanks in advance!

Roman

[Jai]

Where’s “nearby”? There’s Russel steel in Clayton, if it was the Springvale store that was handy. I usually buy from Handy Steel in Heidelberg, but they are a bit pricier generally (free delivery makes up for it in the quantities I buy, but not if you’re going to pick up). No idea on opening hours - people tend not to urgently need structural steel on a Saturday afternoon. 

Lathing 60mm pipe down to 55mm will take 2.5mm off each wall - it may be obvious, but if you start with 3.5mm wall thickness, that’s getting pretty thin. 

Jai

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[Roman Valls]

Jai, thanks for the thoughtful and informative answer!

Alright, so assuming that I want a final 5-6mm wall thickness, would it make more sense to get a solid metal bar instead of a pipe? I'll check out the places you recommended next week then, thank you.

Roman

Den 16 dec. 2017 11:41 fm skrev "Jai" <tygg...@gmail.com>:

Where’s “nearby”? There’s Russel steel in Clayton, if it was the Springvale store that was handy. I usually buy from Handy Steel in Heidelberg, but they are a bit pricier generally (free delivery makes up for it in the quantities I buy, but not if you’re going to pick up). No idea on opening hours - people tend not to urgently need structural steel on a Saturday afternoon. 

Lathing 60mm pipe down to 55mm will take 2.5mm off each wall - it may be obvious, but if you start with 3.5mm wall thickness, that’s getting pretty thin. 

Jai

On 16 Dec 2017, at 11:14, Roman Valls <brain...@nopcode.org> wrote:

Hello CCHS,

I would like to build a contraption/tool with a 60mm pipe and I checked suppliers nearby:

http://www.steelsolutions.com.au/

Unfortunately they close soon today, so I decided to give it a try here and see if:

1) Someone knows where I can find alternative raw material sources.

2) It would be awesome if someone with experience with the metal lathe can teach me should I need to bring the diameter down to 55mm and do other minor tweaks?

3) Someone is available and willing to help out at the HS today or tomorrow?

Thanks in advance!

Roman

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[Jai]

My quick math suggests that solid bar at 55mm would have roughly triple the mass of 55mm pipe with 5mm wall thickness. If that’s fine, then I’d probably do that.  The other option might be to turn some pipe down for the outside diameter, and find a pipe that fits inside it to sleeve it. It won’t be as strong as one piece, but you should get pretty close. 

Jai

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[Clifford Heath]

What problem are you trying to solve? 55mm solid steel bar is heavy and a lot of steel! I assume you're not making an axle for a locomotive? It would be easier to help if you'd tell us. 

I think I bought at Ungar Metals in Warrigal Rd once or twice. 

Clifford Heath 

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[Brendon]

Hello. I have also purchased from Handy Steel, I would even be willing to do a pickup run but you would have to wait until the next available Tuesday night when I can pick it up (they will cut to order but can take a few days)

Without knowing your requirements for strength, it's hard to make a recommendation. I had a look and the common size is 60mm, with an internal diameter of 53mm. By the time you turn down to 55mm, you will have a wall thickness of 1mm, very thin.

If you look here, they sell "hollow bar" aka thick walled tube. They have either 56/40 or 63/40, as an example. Still heavy, but not as heavy as a solid 55mm bar.

https://handysteel.com.au/hollow-bar?p=2

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[Roman Valls]

Thanks guys for the feedback! I'm trying to make a rough DIY copy of
the tool attached, costs an outrageous 150-200 dollars on ebay :-!

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[Brendon]

I guess that confirms you cannot start with 60mm pipe and turn it down. The teeth would be too thin.

[Jai]

How critical are the other dimensions? I might start with 50mm pipe, cut some sections of 5mm flat bar and weld them to the outside, so they stick up where the teeth are. Shape the teeth ends, job done. 

Or roll a 55mm ring out of flat bar, but then you need a roller, and 55mm is a bit tight. 

Jai

On 16 Dec 2017, at 22:41, Brendon <bjn.m...@gmail.com> wrote:

I guess that confirms you cannot start with 60mm pipe and turn it down. The teeth would be too thin.

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[Roman Valls]

Good ideas there, didn't think of bending/rolling a flat sheet, good hint.

The most critical dimensions are on the teeth bits really. They should
be around 5x5 mm more or less minimum, otherwise the pressure exerted
on the tool makes it break easily :-S

I'll pass by the HS tomorrow and discuss all this and some more with
you guys, thanks again for the valuable feedback!

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[Jai]

Bending is the harder way. I would honestly take some 50mm in a solid wall thickness and weld lengths of 5x5 or 5x10 up the outside so they stick up to make the teeth, assuming the *internal* diameter isn’t critical.

Jai

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