Square to round

[Paul G]

I know how you all like a bit of development so I thought I'd post a pic of
a square with rounded corners to a circle at an angle.

All done with a roll of sticky tape.

Paul G

 

[DanielW]

You need to market that sticky tape.

 

[Paul G]

It was as recommended by @rtbcomp so I assume he has the marketing rights.


Paul G

 

[CRB]

Very nice to do something that small. Top marks, get an apple from the teacher.

 

[rtbcomp]

It was as recommended by @rtbcomp so I assume he has the marketing rights.


Paul G

Was it? Not got marketing rights

 

[Paul G]

Was it? Not got marketing rights

You recommended it in my thread about non sticky sticky tape. You must have forgotten.


Which reminds me; two things deteriorate as a man gets older.
One is his memory, and the other is….. Sorry I've forgotten.


Paul G

 

[rtbcomp]

You recommended it in my thread about non sticky sticky tape. You must have forgotten.

.........

Paul G

Yes, I can only remember 10,377 of my 10,378 posts, must be getting old

 

[brightspark]

all this patter and u still havent said how u formed it and whats it for

 

[DanielW]

all this patter and u still havent said how u formed it and whats it for

Its an egg cup for when your lying down.

 

[Paul G]

all this patter and u still havent said how u formed it and whats it for

It's part of the pipework on a supercharged 1967 Renault.


To make the shape I cut a square of steel and rounded the corners.
I tacked a 45 deg pipe bend to the square.
Covered with 25mm masking tape, sticky side out, then another layer sticky side in;
so that's sticky to sticky side.
Tapping the edges with a small hammer cuts the tape then a snip with scissors for the seam.
Open up and hold flat and you have what's known as a flexible patten.


Like this.


Lay template on a piece of stainless and mark round, dot punch line and cut out.
Bend to shape and weld seam, and its done.

Paul G

 

[brightspark]

It's part of the pipework on a supercharged 1967 Renault.


To make the shape I cut a square of steel and rounded the corners.
I tacked a 45 deg pipe bend to the square.
Covered with 25mm masking tape, sticky side out, then another layer sticky side in;
so that's sticky to sticky side.
Tapping the edges with a small hammer cuts the tape then a snip with scissors for the seam.
Open up and hold flat and you have what's known as a flexible patten.


Like this.

View attachment 47122
Lay template on a piece of stainless and mark round, dot punch line and cut out.
Bend to shape and weld seam, and its done.

Paul G

rite we get the drift now nice job

 

[Paul G]

I had to email a load of progress pics to the customer yesterday.

He said, "is it right?"
I said, "it's near enough."
He said, " near enough's not good enough. Is it right?"
I said, "it's right."
He said, that's near enough then."


Paul G

 

[Hitch]

I shall have to remember that one, wasn't so long ago I needed to make something very similar in steel, but the round end larger than the square.... used a piece of box, heated it a little and knocked a steel ball into it until it was the right size. Not quite so refined

How did you form it Paul, just malleted round on a bit of bar?

 

[Paul G]

I shall have to remember that one, wasn't so long ago I needed to make something very similar in steel, but the round end larger than the square.... used a piece of box, heated it a little and knocked a steel ball into it until it was the right size. Not quite so refined

How did you form it Paul, just malleted round on a bit of bar?

A mallet's too big. I would have hit my fingers.

A toffee hammer is the tool.


Paul G

 

[Paul.]

I used to work with someone who was a very capable sheet metal worker, but had had no formal training and had never learned pattern development, his solution to square to rounds was to fab up a square plate, and a round plate spaced to the height to make a 3d mock up template, and then roll it round on the sheet marking each point as it turned, ok for small stuff, and he made a good job of them too, but we had a job come in that needed a 2000 square to a 600 round at 1500 high from 6mm plate, that kind of stumped him, guess who ended up with that job......

Nice little job Paul, what gauge material is it?

 

[Paul G]

It's 1.5 mm 304 SS.

I've still got a set of trammels in the roof of the garage. Two metres with an add on metre if needed.
They may come in handy one day, although they are worth more for scrap.
Made from left over unobtanium tube. Nice and light to use with little flex.

I made a biggish square to rectangle a couple of years back in 6mm MS. 4m X 4m to 1m X .75m.
Pythagoras and a pocket calculator is all thats needed.
It was a feed hopper at a concrete crushing plant. Loads of 150 X 12mm stiffeners down the sides.
It looked so good when finished. Bet it's full of dents now.


Paul G

 

[Wedg1e]

That look just like my missing steel rule! Post it back sharpish and we'll say no more about it

 

[Paul G]

That look just like my missing steel rule! Post it back sharpish and we'll say no more about it

If you can tell me the make, how long it is, and where you left it, I'll post.

 

[DrNik]

If you can tell me the make, how long it is, and where you left it, I'll post.

30cm, eclipse and I left it in your tool box

 

[Paul G]

30cm, eclipse and I left it in your tool box

One out of three.

Poor effort that smacks of dishonesty.