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Member postings for Geoff Rogers

Here is a list of all the postings Geoff Rogers has made in our forums. Click on a thread name to jump to the thread.

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Thread: Trouble getting started
26/06/2013 11:28:35

hi Paul, I have a Warco GH1232 and the max swing in gap is 18inches. The 4" Burrells I am making have flywheels at 18inches diameter. Also, I have the long bed version of that lathe and this is just long enough to machine the front axles. My Sieg X3 mill will be pushed to limits when I come to machine the rear axle gears.

Thread: Scrapped
26/02/2013 11:27:38

Making scrap is as John says really product development - you just don't have a use for that part at the moment. Also have you found that it is almost impossible to make the same 'developed' part again. Geoff

Thread: Arc Eurotrade delivery performance
16/02/2013 13:34:06

One tree stump out, now where is that centre finder.

Geoff

image.jpg

Edited By David Clark 1 on 16/02/2013 18:59:14

16/02/2013 10:59:11

I ordered a centre finder from Arc yesterday at 12:52. It arrived today at 08:30.

I had expected it early next week and had planned accordingly, so I now have a problem. Workshop or tree stump removal! As it is dry, ( I live near Ilkley) tree stumps will win, but as the stumps are right next to the workshop door and coffee breaks can take such a long time . . . . .

Thank you Arc for the service. May it long continue.

Geoff Rogers

Thread: Rivet snap dimensions
03/01/2012 19:32:21
Jason,
thanks for the photo of the hydraulic riveter - I am looking at knocking up a smaller version for the two 4" Burrells I am making
 
Geoff
Thread: Girder crown stays - are they overstressed?
22/12/2011 11:57:53
I am not sure how many Princess of Wales boilers have been built, but I presume those that have have all passed the hydraulic test and are hence structurally ok. Presuming they have been built to drawing, that is.
 
Geoff
09/12/2011 10:58:59
Nigel, Paul
I would be most interested in a FEA of this area, let me know by PM if I can be of assistance
Geoff
06/12/2011 09:00:35
I would agree with Jason and add that there is no such thing as a simple beam. The load capability of any beam depends to a large extent on the nature of the end restrains (or degree of fixing). Hand calculations are limited to 'simple' ie free to rotate/deflect or 'fixed' ie rotation/deflection prevented and quite different results can be obtained for a given beam and loading case.
 
For those with the access, finite element analysis will probably reveal all, but for us others we are limited to such books as Roark's Formulas for Stress and Strain. A good source for beams on elastic foundations - which is what a copper boiler girder stay is.
 
as Jason says, just my thoughts
Geoff
04/12/2011 09:32:48
During my time with Lloyd's Register I approved the design of many steel boilers produced for larger scale traction engines and locos by John Rex and Bell Boilers. For this design approval I applied relevant sections of BS 2790 (Shell Boilers) and in this code girder stay stresses were limited to 1.5 times that allowed for the barrel. This is standard pressure vessel and boiler practise where the item in question is loaded in bending - such as girder stays not attached to the outer wrapper.
 
These calculations apply to steel and copper boilers - the trick is knowing what the allowable stress should be. For steel this can be found from various sources, but copper is more difficult. The allowable stress depends on the design temperature ( ie desired steam pressure) and published data for copper tends to run out at 150C (from PD5500), which is equivalent to about 60psi.
 
Geoff Rogers
Thread: Safety valve springs
07/10/2011 14:30:54
just a short note to advise interested parties that I have now handed over the supply of safety valve springs etc for the Gordon Smith designs to Polly Engineering.
 
Geoff Rogers
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