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In lugnet.technic, Tobbe Arnesson writes:
> In lugnet.technic, Thomas Avery writes:
> > http://stripmine.org/wwwboard/stripmine/uploads/super_front_4.jpg
> I was studying that image, but I still can't quite make it out.
> What line controls what?
Good question. It's not really clear from the image what each line is doing.
> The bottom line seems to control the angle of the bucket via the
> parallelograms, the top wheel/line would raise the bucket into the
> air but what does the back wheel/line do? Does it move the whole
> superfront forward/backward?
I think so. It appears that way.
> http://stripmine.org/wwwboard/stripmine/uploads/super_front_2.jpg
> Calls them "Crowd ropes" but my English is not *that* good :)
Yes. That means they move the bucket back and forth. In this case, it would
be the whole front assembly that moves I think.
Crowds on other style excavators are either rack and pinion or cable
controlled. They linearly move the "stick", or long arm, with the bucket on
the end. This pushes the bucket forward to help it dig into the earth.
> This would mean that this "digger" could make a perfect 90-degree cut into the
> ground by moving the bucket forward and then raising straight up.
>
> 1) Adjust the tilt/angle of the bucket with the bottom wheel/line.
> 2) Push the bucket forward with the rear wheel/line.
> 3) Lift the bucket with the top wheel/line.
>
> Also, how does the dipper door open? Is it done via gravity or?
Yes, it's gravity. There is a release mechanism that lets the doors on the
bottom of the bucket swing open.
TJ
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Message has 2 Replies:
 | | Re: Moc: Digger
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| (...) I can see how it's pushed forwards but what retracts it again? Is there another line in the bottom that pulls it back? (...) Crowds are a bunches of people in a tight area :) Thanks! /Tobbe (22 years ago, 19-Feb-03, to lugnet.technic, lugnet.loc.se)
| | | Re: Moc: Digger
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| (...) The two top ropes work very similar to the ropes on Pehter's digger. The cut is away from the machine instead of towards, so the rope is on the top of the crowd "linkage" instead of the bottom. It's interesting how the bucket tilt mechanism (...) (22 years ago, 19-Feb-03, to lugnet.technic, lugnet.loc.se)
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Message is in Reply To:
| | Re: Moc: Digger
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| (...) I was studying that image, but I still can't quite make it out. What line controls what? The bottom line seems to control the angle of the bucket via the parallelograms, the top wheel/line would raise the bucket into the air but what does the (...) (22 years ago, 19-Feb-03, to lugnet.technic, lugnet.loc.se)
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