3456 and 3457, 1 and 15 October 1976 according to the index I have here.

Neil

EOE!

<EDIT> see below

Edited By Neil Wyatt on 17/07/2016 14:20:45

Full details and much more besides are in GHTs book "The Model Engineers Workshop Manual". If you don't have this I can't recommend it highly enough.

If you watch Myfordboys video on making a furnace you will see a much simpler design. I understand this also appeared in Model Engineer. He uses it in a couple of video's. The rolls are linked by cranks.

I am an admirer of GHT but not so sure in the area of his particular design of rolls. Why – because I have seen the usual type used in tin smith work areas. They don't seem to have any problems with them. Myfordboys is a simplified version of these that gets round the need for gears. It appears to work well.

John

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Edited By Ajohnw on 17/07/2016 11:25:40

You might like to watch this video and note the comments Andy which from memory uses GHT's principle – from memory cause at the moment I can't get at the book. The books size and content up's the price.

**LINK**

It's compact as he wanted to roll very thick steel with it. There is a little bit of info on making it in another of his videos.

I'm not sure which edition of Model Engineering that his other design appeared in but some might find the video's of him using them of interest if they are using pyramid rolls.

John

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Just checked the index and it is definitely says 3546 and 3547 NOT 3456 and 3457

I did say EOE….

Neil

Maybe you could pdf the Myfordboy one Neil. It was published circa 21 years ago in model engineer.

I suspect some wouldn't need plans. The cranks at each end are 90 degrees apart as per a loco. Some how I'd guess readers didn't take it seriously however for most of the sort of things people do with them it does work and can from the video's cope pretty well with them for much much simpler manufacture than even pyramid rolls.

There are 2 designs here

**LINK**

It's a good job that the mistake is noted in the comments. It need another gear between the 2 shown.

Or

**LINK**

There is also another design that GHT and the above has copied after a fashion. 2 rollers have meshing gears. They are used to feed stock against another roller. The gear teeth have an odd shape so that they can cope with variations in metal thickness as the gap between the rollers is used to grip the metal. The teeth are similar to clock style cycloid teeth with plenty of clearance, similar to the ones that used to be used on mangles. Some may remember their gran using one of those to pre dry the washing. Also called a wringer. I'm pretty sure there was an article in ME on this type of tooth form. The gears do need to rotate in op… directions with this arrangement and it's more suitable for materials that are easier to bend due to the strength of the gear teeth. Probably ok for steel up to maybe a 1/16" or so thick if suitably sized.

John

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Is there any reason you could not use gears from a lathe? Perhaps size and thickness may be a problem?

Clive

PS. I could not make one in my lathe if I wanted to. ML10.

I suspect the design for the GHT will be found on the web if general metal rollers is googled.

The style of gear teeth I mentioned may have been lost to posterity unless they are in Machinery's. This shows the idea roughly. In this case as used on a printing press.

The teeth were generally pretty thick and I believe sometimes removed from mangles when they were being thrown away. There used to be lots of them about.

I'm pretty sure I have seen a roller made using chains and sprockets as well. That will have been a pyramid type as the rollers will both role in the same direction.

When I started at home I thought I must have a set of rolls – managed without to date as I haven't needed their functionality.

John

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At 27 quid from Tee Publishing it is not a cheap book, but it is great value for money. One of THE definitive books of the golden era of model engineering and great reading. And a different thing altogether from the Workshop Practice series, as good as they are in their own right.

Edited By Hopper on 22/07/2016 13:07:01

John, Myfordboys ring roller is not a scaled up GHT. I think one of the problems is the short rollers are only supported at one end so tend to flex apart.

Andrews uses two side plates with the short rolls between. Capable of rolling 5" x 3/16" or there abouts.

Or you can always go for a poor mans roller, 3 bits of metal in a vice make an effective "pyramid" which can be used to bend metal into curves and circles.

J

Edited By JasonB on 22/07/2016 14:19:27