Ny-Lint Mobile Dragline Conversion

[Rvjimd]

Video checking the clearance and position of the two low end pulleys for the crowd rope. I'm thinking about making a fair lead for the crowd. If I can position the rope out front and down low, and I can make the holders for the pulleys? I think it would look cool, if I can make one that isn't too far out of scale for the machine.

http://youtu.be/LIUX2lDLoxs

Jim

[bigford]

the dogs like whatever!!! looks good

[modelman]

Looking good jim. Does your lathe have thread cutting capabilities? If so, you could cut laggings in the drums to keep ropes from crawling on top of each other. May not be a problem on this. The fairlead idea is good. All draglines look good with them and they serve a good purpose. Have you considered what scale this model might be?

[Rvjimd]

Tom,

Thanks, I have a bunch of work left to go. I can't cut threads, I think I have the drums set up square enough that the ropes wrap pretty good.

I think the scale is 1/18th.

I'm turning two pulleys for the boom tip and then I'm going to rig it up with my homemade clamshell bucket. You might know my style, I love to get it to a point that it runs, then play with it, I mean TEST it, and then do the finish work.

I am planning to try the fairlead and see how it looks.

Jim

[Rvjimd]

Got the crane pivot servo working. Not completely satisfied with the pinion to servo attachment. I am afraid it won't be long before the threaded bolt comes loose in the top gear of the servo. I did have a nut on the top of it but didn't have enough clearance for the pinion above the truck body, so I had to remove the locking nut. Also the pinion does not fit on the thread of the 4-40 perfectly, so the pinion is not perfectly true and wobbles just a tiny bit.

http://youtu.be/_4BFGXFBoYg

Jim

[bigford]

looks good, are you going to have enough power
to swing when the bucket or clam shell is full of dirt?

[Rvjimd]

BigFord,

Ya, I'm pretty sure it will be plenty. I have the radio turned way Dow to make it smoother and slower looking.


Been sitting here monkeying with the TX trying to figure out how to engage or disengage the boom control using the throttle cut function. I have the radio programmed as a heli and the boom up and down is on the throttle stick. I can't quite get it to work the way I want. Gona have to dig out a manual I guess.

Jim

[bigford]

good luck with that. I read the manual once only once!!!

[speedy8305]

hey may i ask what is the diameter and thickness of the turntable gear you have there

[Rvjimd]

Speedy,

It is a stock Trex 500 heli main gear. I'll measure it tomorrow. Probably find the specs online. I just grabbed it off the shelf a year ago knowing it might work for such a project,

Jim

[Rvjimd]

Speedy,

The gear measures 3 7/8" x 1/4". It is actually too big in outside diameter for this particular crane but it works. I think perfect would be just big enough to fit around the steel bearing ring on the bottom of the crane house. Also, I custom made the spacer hub for the center to fit the steel center post and cone shaped the outside diameter to center up into the middle of the plastic gear.

The picture doesn't show the top of the rule, but it measures 3 7/8"



In this picture you can see the wear mark on the truck bed where the bearing ring rides. That shows how much too big the new plastic gear is. It doesn't stick out and doesn't look bad so it works for me.



Jim

[Rvjimd]

Here is a short video of the first heavy lift of the crane.

http://www.youtube.com/watch?v=LvqALyTyGYo

Jim

[modelman]

Looks good jim-you seem to have plenty of power and you probably couldn't build a drag bucket large enough to carry that much weight in dirt. However, watching the video it looks like your boom angle will control the amount of weight your carry. That,s okay, you will just have to be careful with the boom when carrying dirt. Keep at it!!

[Rvjimd]

Tom,

Thanks, the truck is pretty heavy and I have good counter weight in the crane so I think it will probably be able to dig with the boom level.. The big problem I will probably have will be clearance for the crowd rope around the truck body, even swinging off the sides and rear. When I started mounting the slew ring I was not unhappy to let the crane ride entirely on top of the plastic gear because it give me another 1/4" of height to improve the clearance.

Now, to work on the drag bucket and thinking about how to power the truck.

Jim

[modelman]

Jim-when you say crowd rope, do you mean the drag rope. If so the correct placement of your fairlead might solve that problem.

[Rvjimd]

Tom, ya that is correct. I will see how it goes and start on the fair lead once I get that far.

Jim

[Rvjimd]

Getting the drag bucket looking good. Hung on the machine to see how the size of it looks. Few adjustments and such and this thing will be moving dirt!













Jim

[modelman]

Nice work jim- smart decision using brass. I used steel on mine and it was really hard to braze all the parts on it. As it got heavier it acted like a big heat sink. Do you know what this bucket weighs? I had to add weight to mine at first but after I got all the mounting points correct the weight was no longer needed. I see you have no adjustments for your mounting points. Hope that works for you but I had problems with this. Watching for the video. You work fast!!

[Rvjimd]

Video...

http://youtu.be/-n7tb6cv77A

[TRUCKMAKER]

Nice job Jim, I only hope mine turns out working half that well!