Ny-Lint Mobile Dragline Conversion

[Rvjimd]

Kent,

I had forgotten about yours. That extension looks nice and must be at least twice as long as the one I'm building.

Tom, I checked the boom. My extension is 4.5" and the new total is 27" center to center.

Jim

[Rvjimd]

Getting the boom extension finished up. I saw this sheet metal tip on a YouTube channel I think it was mrpete222. He was cutting sheet metal with a hammer and chisel. I saw it and thought it looked pretty crude and completely nuts. But, I got bored and had to try it! I can't believe how GOOD it actually works, so I made a quick video with some pictures and video of the last section of boom extension.

http://youtu.be/CbCeD10j9hg

Jim

[Rvjimd]

Here is the boom extension installed and painted yellow. Didn't have any blue on hand, not sure what to think about the yellow section?







Jim

[Mikem]

Looks great !

[Rvjimd]

Man, this thread is worthless without the photos.

Here are a few of them in a video format.

http://youtu.be/h_wDThHiDg4

Jim

[frizzen]

Thank you very much for the montage video!

Do you still have any of the other videos on your youtube account?

[Rvjimd]

Frizz, glad to help out. I think the dragline videos of mine that survived are the new ones of the crawler undercarriage.

Did a bit of work in the shop yesterday, made two pulleys on the lathe and found a fairlead drawing that I'm going to use as an example. We will see how it goes. I'm not sure how I'm going to do it yet? I found an old thread on the die cast forum where 9W milled the one on the 9W from a solid block.

I was looking at it yesterday thinking maybe making it in two or three parts and bolting it together. I would like to keep the easy conversion from drag to clam if I can.



Pulleys to check size/scale.



Jim

[Rvjimd]

Question:

Since this thing sort of floats and is able to pivot, should the final rollers be positioned a bit off center high so that the rope would tend to keep the final rollers vertical? In the drawing it looks like it is on center.

Jim

[9W Monighan]

Originally Posted by Rvjimd

Question:

Since this thing sort of floats and is able to pivot, should the final rollers be positioned a bit off center high so that the rope would tend to keep the final rollers vertical? In the drawing it looks like it is on center.

Jim

My question is the same Jim. But, if you think about it, when the cable dips down or up it goes off center pulling on the wheels rather than the rollers.
Watch some of Bennett Shovels Lima 2400 videos. That machine has the same type as this B-E one. I think the reason for this type is because on these smaller machines the drag cable is whipping around way more than the giant dragline's ropes. Translating into more wear so the load is transferred into both sheaves. The large machines have more space to put larger diameter sheaves on turning slower lasting longer.

[frizzen]

Thanks i only saw it on the truck in a couple videos in a garage with a dirt pile. Killer looking crane.

That's a really slick roller fairlead. I would make a T plate adapter to mount that off the front so 3 fasteners or 2 fasteners and lifting a hook off a lip let you pull it to convert to clam.

I don't think it would need to be offset above or below much since it looks like the larger sheaves are close enough the cable is captive between their edges. How much float do you think it'd take to keep the line smoothly filling the winch drums instead of bunching up?

[Rvjimd]

Friz,

This thread probably has more stuff related to my crane conversion. It is the crawler undercarriage that I made last fall.

http://www.rctruckandconstruction.co...ad.php?t=10381

Jim

[frizzen]

Do you remember any details about the drag bucket, was it made off any plans or just eyeball? I assume its brass or steel?

Jeremy

[Rvjimd]

Jeremy,

It is all brass from the rack at the local farm store. I can get you some measurements if you want. The bottom is made from a pretty thick piece that was full width (1.5" I think) and I basically found a patent drawing of a bucket that I printed to a size that looked about right for the scale of the machine.

Let me see if I can find the link that I used. One of the photos in the build has the print under the bucket in one shot.

The video at 1:50 shows the drawing I used. I basically used the drawing to match the curve of the bottom piece. Still looking for the link, stand by...

Okay, let's see if this link works...

http://patentimages.storage.googleap...1/imgf0004.png

And this should be the full document...

http://www.google.com/patents/EP0321542B1?cl=en

And mine measures .070" center base plate 2" wide at the mouth and I tapered it a bit toward the rear to make it load a bit better. The sides are about 1" tall and I made them from thinner .035" but they could have also been .070" to add weight to the bucket. I thought about adding wear bars to the under side of the bottom and maybe sides to give it more mass.



Jim

[Rvjimd]

Guys,

I'm trying to improve the crawler on my crane. I decided to try the "Z" style drive tumbler. My question, do the lower idlers help keep the tracks centered?

Here is a pic of what I'm trying to do. Not sure what it is on? Old something?



Anyone have any drawings of the idlers for something like this? Why are some like this and other like center wheel and knobs on the driver?

Thanks, Jim

[Rvjimd]

Here is my prototype Z tumbler. Now I'm trying to figure out what to use for the new drive "stubs" or dogs or whatever they are called? The little nub on the track links. I need something a bit wider than the current version.



Jim

[modelman]

Hi jim-good to see you working on the dragline again. I have this one old picture that may help.-

I think most of the old machines drove from the lug in the center of the track pad. You can see in this picture one lug is inside and one lug is outside of the tumbler.

[Rvjimd]

Tom, thanks for the picture. Do you know what brand or age the machine is? I'm curious about when or why they decide to use various style lugs and drive tumblers.

Jim

[Jared]

Originally Posted by Rvjimd

My question, do the lower idlers help keep the tracks centered?

Yep. And I think the bottom rollers should be spaced different than the spacing of the lugs so the track can't slip around them. That way at least one or two rollers and lugs will always be engaged.

Originally Posted by Rvjimd

Why are some like this and other like center wheel and knobs on the driver?

My guess is patents. Someone patents one style so the next guy has to figure out his own way. And always there's the quest for a better mousetrap.

[modelman]

Jim-sorry but no I do not know the year or model. Here is another picture. It doesn't help but just shows it is a small machine.-

It could be a Koehring, not sure. There is a guy on here named "bartles" that is building a model of a Koehring 305 dragline. He sent me these pictures. Look on page-8-for his thread but he hasn't been on here for a long time.

[Rvjimd]

Progress on the crawler update. I machined a few new drive dogs for track pads and made a new main and center idler wheel. I need at least four more small idlers then I can test the new design.



Jim