Have a look at some fundamental mechanisms we used in the 20th century. Some of these basic mechanisms are still used today.
Maltese Cross mechanism powers second hand movement in the clock:
Radial engines are used in aircraft. Today, however, most aircraft use turbine engines:
Reciprocating movements power steam engines in locomotives:
Sewing machine:
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When the police stop you for over-sized load, just bail, lol.
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surprise butsecks
they don’t always come gift wrapped
suprise, more kinky butsecks!
OMG YOU GOT ME!!!
The plural of aircraft is aircraft. There is no such word as aircrafts. You might want to correct that
dont you have anything better to do then pick up on peoples tiny mistakes?
corrected
I think you meant “Don’t”, “than”, and “people’s”. You’re welcome.
hehe i almost liked bef’s bevy of comments better than the superb animations. kudos to both.
That two-slider mechanism, number 3, is a classic “I can’t believe this works” novelty, but I don’t think I’ve ever seen it in a steam engine.
the mechanism in number 3 is also a fine way to draw an ellipse.
These are awesome. (how many words do I need in this thing??)
Thankyou so much!!! I have been looking for the Maltese cross for about a year now because I forgot its name and I have been wanting to make one, and I wanted to find a way of working out the proportions. THANKYOU!!!
That “Maltese cross” is often called the Geneva mechanism. It used to be seen in automobile odometers and digital clocks, before electronic displays took over both functions.
all i have to say is poop and the french suck
I agree with bef the french do indeed suck, they suck bobbin
very interesting!
Good stuff. I love the maltese cross and the sewing machine. The mysterious has been made plain. Thanks. Some of these commentators seem to be on the wrong page–need to get their heads out of their asses.
really useful… bcoz we never know whts behind…
thanks
The bobbin (the rotating part in the bottom) is a free floating case and does not so much slide onto an axle as fit into a cavity. There is an unaffixed axle on the back side that the bobbin case floats on. If you have the chance to look at a sewing machine, the bobbin (a small spool of thread) is set into a bobbin case and threaded through the case, which is an odd little stubby, cylindrical cap of sorts, with a hinged flap that controls the tension of the case on the bobbin reel. The bobbin thread is wound through grooves in the case and then upward over the throat plate of the machine. The case is inserted into the base of the machine and slid onto a one sided axle. The loop of top thread dropped down by the needle is dragged through the bobbin case by the bobbin thread, and flipped around the bobbin case and the axle. This threads the bobbin in a straight line along the base of the fabric by threading it through loops of the top thread.
I loved these. I stared at the sewing machine one for about five minutes. I’ve sewn a bit, but seeing the illustration really clarified the motion. Nice!
I just reread that, thought about it for a minute, and realized that I’d apparently confused myself. The bobbin case slides into a cavity in the base of the machine. There is no axle. The axle is a lie.
The ball in the center of the graphic represents the bobbin reel, which is a small spindle filled with thread.
Sorry for the three post set. Not firing on all cylinders here.
looooool bef