Gallery, Projects and General > The Design Shop
Roberts straight line linkage
SwarfnStuff:
Hi All,
Stumbled across this on YouTube and, thinking it rather unusual and a possible future project (maybe) I wondered if anyone has seen or made one.
Fascinating, but I don't seem able to find plans either. Not that that means much, searching for specific plans is somewhat problematic for me and the original poster does not refer to there being any.
Worth a look at the link anyway and I would appreciate your views.
John B
Ironhorse57:
I haven't seen this set up before - looks interesting but I don't see any advantage in using it over a conventional crosshead & guide
Dave
chipenter:
Hear you go http://www.kts.tul.cz/content/files/podklady/06SM.GB_Straight_line_linkages_fin15.pdf .
John Stevenson:
Actually got for more moving parts and links to wear out plus not as much bearing surface as a crosshead, so even more wear .
SwarfnStuff:
Thank you for your responses. All appreciated.
Dave, possibly no advantage whatsoever. Just as I said fascinating, and, as a model could be interesting.
Jeff, thank you for the link. It contained useful info and well worth the read.
John S, I agree, but still fascinating.
Perhaps it's my curiously twisted brain but quirky = interesting and, let's face it if I ever build it into an engine model it is just for that reason, interest. As for wear, models typically run for minutes at a time and therefore unlikely to wear out in my remaining years.
I assume many of these linkages were invented to circumvent patents on existing crosshead or parallel linkage designs. Or, perhaps were the precursor.
Anyway, following Jeff's web link. Since Robertson lived (1789 - 1864). His design seems to be somewhere between his birth and 1852 when his firm collapsed.
My Guess, from the dates in Wikepedia somewhere between Watts' Linkage 1784, and Chebyshev's 1878
All interesting but not essential to messing about in the shed.
Thanks again.
John B
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