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Construction Equipment If it digs, pushes, hauls dirt "off road" post it here. |
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Thread Tools | Display Modes |
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#1
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Barge-Mounted Clamshell Crane
http://www.youtube.com/watch?v=0x5b3E7Mp5o
Hi, guys! Here's a video of my 1/48 scale (give or take a little) crane playing in the "sandbox". I started it with the idea it would be a quick-and-dirty build which it still is, but I've been working on it off and on for a couple years now. The machinery deck is 4x7" and the boom is about 30". I didn't really design it, I just did a quick sketch and started building and then later modifying to make things fit. I decided to build a barge-mounted crane because I have a tugboat that needs a barge to push and also so I didn't have to mess with an undercarriage. I used this and others like it as inspiration: http://www.generalconstructionco.com..._DataSheet.pdf I don't have any pictures at the moment but I'll try to get some sometime this week when I have time to do a partial dissassembly. PS How do I get a Youtube video to show in a post rather than just a link? |
#2
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Re: Barge-Mounted Clamshell Crane
Beautiful work!
I really like the detail with brass components. It sure works smooth and quickly. I'll be looking forward to some close up shots of the drive systems and structure. Jordy |
#3
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Re: Barge-Mounted Clamshell Crane
Yes I like how smooth this works.
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#4
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Re: Barge-Mounted Clamshell Crane
Boy, for quick and dirty model, that sure turned out nice, Monighan! I really enjoyed watching the video. Smooth running model and it looks like it's very efficient too. Great work.
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Nathan |
#5
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Re: Barge-Mounted Clamshell Crane
That's pretty NIFTY!
I dream that someday I'll have barge dredger too, probably cheat a little & use one of my old excavs. Let's see your tugboat too. Any video of it on the water? |
#6
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Re: Barge-Mounted Clamshell Crane
Cool crane! Looks like a blast to operate.
You could make a dragline bucket for it too.
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Scott "No load is too Small" |
#7
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Re: Barge-Mounted Clamshell Crane
Very nice model! Like others said, smooth and a very good representation of a clam-machine. I see a lot of them operating along the Ohio in Indiana and Kentucky. Some are barge-mounted, some are pedestal-mounted unloading barges.
Ken |
#8
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Re: Barge-Mounted Clamshell Crane
Really nice machine. Do you have some pics of the drums etc? Ho did your clamshell smoothener work?
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#9
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Re: Barge-Mounted Clamshell Crane
Jared, You have built yourself a great clamshell and crane, Looks like it ought to be out on the Columbia River working on the channel. Look forward to seeing it in person someday as I only live up the road a few miles. Fred
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#10
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Re: Barge-Mounted Clamshell Crane
Nice job it looks great and run smooth I could see myself playing in the garage with that for hours.
Travis
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AKA "00" Biddle RIP FreddyGearDrive 2-12-59/12-19-11 |
#11
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Re: Barge-Mounted Clamshell Crane
Man is that neat!! you got a lot of work in that piece!
Brian |
#12
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Re: Barge-Mounted Clamshell Crane
Here it is in all it's spaghettiness sitting on it's unfinished barge.
Machinery deck layout. The lower left servo is boom hoist, center is swing, upper left is digging line, upper right is holding line and the tagline winder is on the far right. The drums are turned out of acetal rod and the centers are bored out to .25". Then I cut the arms off spare servo horns, turned the hubs down to about .255 and pressed and superglued them in so the drums could be mounted on the servo spline. No problems so far. Swing gear is done the same way as the drums even though it's aluminum. The swing circle is what I think is called double-row ball bearing. The outer piece has a flange on the inside, sort of a tee in cross section, with a ball race machined into both sides. Then upper and lower plates have matching races machined into them and sandwich the flange. Then screws go up through the lower plate, thread into the upper plate to hold it all together and then stick up about 1/4" so the machinery deck can drop over them and be fastened to the swing circle assembly with nuts. Hopefully that makes sense. Tagline winder. The spring pulls the lever, lever pulls shaft, shaft spins drum, drum pulls bucket. Last edited by Jared; 12-08-2010 at 10:08 PM. |
#13
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Re: Barge-Mounted Clamshell Crane
Tagline runs through this little block. It ain't much, but I'm kinda proud of how well it works.
Bucket is set up with a four-part line but can be increased to six for digging harder material. This is more of a rehandling clam; I have a round-nose toothed digging bucket in the works. |
#14
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Re: Barge-Mounted Clamshell Crane
looks awesome!!
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#15
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Re: Barge-Mounted Clamshell Crane
If my math is correct, the servos are theoretically capable of lifting 23 lbs. The drums are about 3/4" in diameter and the servos are supposed to be good for 139 oz-in. I divided 139 by the radius of the drums, .375" which comes out to 370 oz, which is 23.1 lbs. Did I do that right?
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#16
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Re: Barge-Mounted Clamshell Crane
Many thx for the pix. Your tagline arangement is very interesting. Did you calculate the force that the spring should have or just did you do it by trial and error.
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#17
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Re: Barge-Mounted Clamshell Crane
Quote:
Thanks, td9clyde. Quote:
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Or you can do it like this: http://www.seattlerobotics.org/encod...0for%20PWM.htm I'm not really an electronics guy and I didn't feel comfortable poking around the electronic guts. But this is probably the better way to do it because you don't have to worry about the pot changing position. |
#18
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Re: Barge-Mounted Clamshell Crane
Very impressive I love the video and thanks for posting the pictures. Everyone around here sets the bar pretty high.
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#19
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Re: Barge-Mounted Clamshell Crane
that is one cool drag line works very smoothly i like it keep up the great work
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I built this thing and have it working now what do I do with it? |
#20
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Re: Barge-Mounted Clamshell Crane
NICE!!! Now you just need to scale it up to 1/16th so you can play with all of the semis We need something like this for bigger scale trucks to use instead of just the elevators and payloaders. 30" in 1/48th is about 90" in 1/16th So about a 8' boom would be fun to watch
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