LBSC Invicta frame plate question

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LBSC Invicta frame plate question

This topic has 8 replies, 3 voices, and was last updated 12 July 2013 at 16:44 by nigel jones 5.

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6 July 2013 at 19:16 #123995
Alexander Edblad
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@alexanderedblad56890
Hi all,

I'm building the frame plates for the 3.5" Invicta. The plans seem to be missing a dimension which sets the angle of the cylinders. There is a motion center line that starts from the rear main wheels, but no indication of the angle of that line.

Is the angle not that critical? There are a few other measurements lacking as well so it makes scribing out the lines rather difficult.

I do hope you understand what I mean.

Thanks,

Alex
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6 July 2013 at 19:16 #6778
Alexander Edblad
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@alexanderedblad56890
6 July 2013 at 19:48 #123998
Weary
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@weary
Alex,

The angle of the cylinders is given as 30 degrees to the horizontal in the original LBSC article on constructing The 'Canterbury Lamb' (Model Engineer, 10th July 1952, Vol.107, No.2668, pages 55 – 58).

What other measurements/dimensions are you missing?

Regards,

Phil.

Edited By Weary on 06/07/2013 19:50:47
6 July 2013 at 21:11 #124006
Alexander Edblad
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@alexanderedblad56890
Thanks Phil. Now I should be good to go. Unfortunately I don’ t have the building article so just relying on the plans.
7 July 2013 at 20:34 #124049
nigel jones 5
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@nigeljones5
Im making it in 71/4 using the 31/2 gauge drawings. There is one definate error (trying hard to remember!). It relates to the d valve linkage pivot arm pin/boss dims. The pivot arm has a phos bush in it but if you make it to drawing it wont fit. Work through the various dims with referance to distance from outer edge of the frame plate to the linkages and you will see that the protruding boss depth is way too big – twice what it should be.
7 July 2013 at 23:13 #124066
Alexander Edblad
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@alexanderedblad56890
Fizzy,

Thanks for pointing that out. I believe that you mean the triangle shaped rocker arm? Here´s a link to a picture which shows that part. **LINK**

Please correct me if I´m wrong. I don't have the plans at hand this late hour. By the way, do you work with castings or stock material?

Alex
8 July 2013 at 00:56 #124073
nigel jones 5
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@nigeljones5
thats it..your picture seems to show it as per drawing but im sure it doesnt fit!!! let me know what you think??
8 July 2013 at 12:48 #124103
Alexander Edblad
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@alexanderedblad56890
Well, I think the best thing to do is start off machining the cylinders complete with steamchests, and then make the valve linkages to line up properly with the valve spindles.

What I’ m worriyng for more is how much/little side play is needed.
12 July 2013 at 16:44 #124426
nigel jones 5
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@nigeljones5
im working with raw materials only
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