Everyone remembers the song stating that the wipers on he bus go “swish, swish, swish”, however upon frequent observation they most certainly do not. The wiper blades alternate between synchnous and out of synch cycles (next time it rains go hop on a bus and see for yourselves), so i pose you the question of why the hell does this happen ? I mean the quality control at the windshield wiper motor manufacture can not be so piss poor as to make each motor diferent the should all be the same. Even if they are designed to run on different timmings what is the advantage of this ? Anyways if someone out there can offer me some peace of mind thank you very much.
The motors are DC (or pneumatic ?), and are therefore not synchronized to a fixed frequency. The period of each wiper cycle will depend on the load which will be different for each wiper. Auto wipers are usually run off of one motor and are therefore in sync.
A point in every direction is like no point at all
Oblio is right, but just to be explicit: There is no advantage to having different timings. There is a disadvantage to requiring identical timings – some sort of synchronizing mechanism, either mechanical or electrical, would be necessary.
So it’s not that different timings are desirable – it’s just cheaper that way.
If all you have is a hammer, everything looks like a nail.
Thanks a lot guys, thats been bothering me for quite some time now
Thanks a lot guys, thats been bothering me for quite some time now
Unless the two wipers interfere. Which is why car wipers are synchronized but not bus wipers.
Also, because the wipers have to be so far apart a linkage system connecting them would be bulky and prone to breakdowns. Using two completely separate systems is more sensible.
I for one welcome our new insect overlords… - K. Brockman
This, of course, makes it possible for he bus driver to fire his machine guns through the windshield without danger of shearing off his wipers.
Uke