Thread: Step by step on making a Square to Round transition

Seems pretty clear to me ... maybe you should get it translated into New Zealand and then see if it makes sense.

Oh yes, and welcome to the forums.

Originally Posted by neil9

As clear as MUD and impossible to follow jack

What is it you dont understand? Jack

hi, Al B, i am curently working towards my le4val 3 NVQ and need to develop a squair to round as part of mp practical evidance. the step by step guige is very help full and easy to follow but do you know how to/have an equation or formula to work out the angle fore each bend? i will be using a computer controlled press brake so the set up will be ok if i knew the angle. at a geus is it 90 degreas devided by the amount of bend lines in each quater. any help will be much appreciated an e-mail would be spot on but i will check this site for a reply, thanx again for the info so far

IIRC, the angles for the bends in the transition are not all the same, except for symmetry. A book on the topic of "Descriptive Geometry" may have some examples to confirm or deny.

A light fold at each bend location will persuade the metal to find its final form. And knowing how to form the material by hand will be useful when/if a computer isn't available. For example, in case of power failure.

Cheers,
Joe

thanx for clearing that up, my back up plan was trial and error lol, but i think i will use thinner material than originaly planned to use eg 22 or 20 guage so it is easyer to form. we have a hand bender that i will use. i'll let you know how it goes.

by chance do you know of a lobster back step by step walk through? the next thing on my list of practical aplication haha

thanx again

Not until now. And wish I didn't. Google ["lobster back"] is a better advisor than me.

Cheers,
Joe

Originally Posted by matthewc

do you know how to/have an equation or formula to work out the angle fore each bend? i will be using a computer controlled press brake so the set up will be ok if i knew the angle. at a geus is it 90 degreas devided by the amount of bend lines in each quater.

matthew I didnt use any formula to work out the bends it was all done by eye, something to also keep in mind is the type of metal you are bending as some metals tend to have some spring back which may require some compesation for this.

Sorry I dont have a step by step for a lobster back bend. Maybe one day I might do one but at the minute I just dont have the time. As Joe has already metioned Google is your friend!

For the gent who did not understand the triangulation involved in a square to round sheet metal layout.

Have a look at this.

http://www.thesheetmetalshop.com/pdf...l/Problem1.pdf

This took 35 secs including typing the key words "sheetmetal Traingulation" into Google

A similar problem solver for the lobster back layout should be found by using the key words "sheetmetal lobsterback layout"

This took a bit longer looking for the info within the site - 4 minutes

http://www.thesheetmetalshop.com/pdf...rns_Kidder.pdf

Grahame

How do i layout a flat bottom sq too round ??

What exactly is a flat bottom sq too round?

Stuart

Hi Al B, thanks for that, I'm never likely to need to make a transition, but I did an electronics apprenticeship in the early 60's & was fortunate to spend about 5 months of my first year in the sheet metal dept. Had some wonderful tradesman & learnt a lot (including square to rounds, offset cones etc. Those were the days. Thanks for bringing back some good memories & the pics.
Ian S.

Originally Posted by Stustoys

What exactly is a flat bottom sq too round?

Stuart

The vertical axis is square to the base as opposed to a base that is truncated or cut off at an angle.
Cheers
Grahame

Hi Grahame,
Maybe, but isnt that what the OP has done? I think what he is after is an offset square to round transition*. Though as it seems he hasnt been back since he posted his question I guess we dont need to worry to much. Seems to be a few one post wonders lately, or is it just me?

Stuart

*but then the OP has also done a "flat bottom sq too round" as the dia on the round and the side of the square is the same............... Ok I have no idea what the guy wants lol

LOL! If you know someone with access to 'Plate and Sheet Developer' they can give you a dxf file...

Somebody had to know how to do the calculations to develop the software. Some people can say 'why do I need to know that? The computer does it for me.' Well, if you know how it works on paper you understand the software better.

I've lost count of the number of times I've had to explain fold allowances or tolerances to CNC operators....

More importantly, knowing how to mark out a transition helps perpetuate knowledge which would otherwise be lost.

Come here kids, we're going to the shed.....