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Rank: Advanced Member
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Man that is AWESOME!!!! This is one of my most anticipated post. I can't wait to get more!  Thanks for sharing,
Chris
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Location: Iowa
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Looks FANTASIC !!! Keep us posted on the progress.
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Rank: Advanced Member
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Location: Grapevine, Tx
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That is bad a$$ Kerst!!! You are a master craftsman, and your engineering skills are equal. Can't wait to see the next progress update.
Jeff
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Rank: Advanced Member
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Joined: 9/7/2005
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Location: Copake, NY
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I worked a bit on the upper structure. I made the A-frame and turned a lot of sheaves. Depending on boom configurations i will need between 60 and a 100 sheaves. I bought a lot of 100 ball bearings on ebay for very little money and I turned the sheaves out of Acetal. This is easy to work with and it is light. Once i had the set-up right it went relatively fast at about 16 an hour. I will turn the sheaves for the hook block from brass.  Kerst
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Joined: 6/1/2006
Posts: 4,065
Location: Dublin Ireland
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great work there,I used to love turning different plastics in my old job,just whack up the rpm and cut away  this is tuning out great!!! can't wait to see more,thanks for the updates
Why is "phonetically" spelt with a "ph"? ... It's better to be silent and thought a fool, then to speak up and remove all doubt The complex of Newgrange was originally built between c. 3100 and 2900 BC,[2] meaning that it's aproximately 5,000 years old. According to Carbon-14 dates,[3] it is more than 500 years older than the Great Pyramid of Giza in Egypt, and predates Stonehenge by about 1,000 years.
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Location: Lewisville, Tx.
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Damn! ( I think everything else has been said ) That is a true work of art. Reminds me of that little owl from the first Clash of the Titans. All sorts of cool little workings, amazing attention to detail!
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Joined: 9/29/2003
Posts: 258
Location: Cumbria, United kingdom
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Man that is gonna be some big model. what else can you say but WOW.
Paul A
Take it to the limit and then just a bit more
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Rank: Advanced Member
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Posts: 515
Location: Richfield, Oh (Cleveland)
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Looks great Kerst. The screw and linkage for the outrigger jacks was genius.
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Location: Pittsburgh,PA
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TIME TIME TIME TIME. I know where you're coming from. It seems by the time you figure out how to and build it maybe a week or two goes by unnoticed. Refreshing my mind on your earlier posts, I forgot how complex your drive line is. Those gearboxes are fabulous.  Don't you wish all the parts could be made 16pcs per hour like those plastic sheaves. 
9W Walking Dragline Build Links:http://www.rctruckandconstruction.com/showthread.php?t=117Scale 4x4 RC Buildhttp://www.youtube.com/user/Scentlessapprentice9?feature=mhee#p/u/9/59FR27c9BwEhttp://imageshack.us/user/caffco
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Some nice projects people have going here and nice machining ! Chet
I live in my own little world it's ok they know me here
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Rank: Advanced Member
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Joined: 9/7/2005
Posts: 1,150
Location: Copake, NY
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Thanks to everybody for the support and compliments! It is nice that I can share the progress on the LTM1800 here on the Forum. I think it will take me about 10 years for the whole project, but I thoroughly enjoy building and figuring out the mechanics. I am usually way ahead thinking about how to make something, sometimes years before I actually make it. I am already thinking about the telescopic boom! At the moment I am in a good rhythm and i can work on it for about 4 to 5 hours every week. It is all going to work and I am looking forward to drive it around fully rigged! But once the crane is finished it ends up in a box and only comes out for the occasional exhibition. I don't have space at home to display my 3 cranes. Kerst
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wow!!! this is coming along great, you are doing a excellent job on it kerst, keep us updated, thanks
Brandon my youtube channelMy Facebook Page
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kerst wrote:
But once the crane is finished it ends up in a box and only comes out for the occasional exhibition. I don't have space at home to display my 3 cranes.
Kerst
I am wondering the same thing too  . I have a special crate to haul my 9W model that can be loaded with a forklift, but when the boom is complete I have even bigger problems. I may have to buy a 16' enclosed trailer .Or I may just build a bigger crate and haul it on my25' gooseneck trailer but that's overkill. As far as storage, my brother is going to see if I can keep it on display at a local hobby shop where he's friends with the owner in the off season.
9W Walking Dragline Build Links:http://www.rctruckandconstruction.com/showthread.php?t=117Scale 4x4 RC Buildhttp://www.youtube.com/user/Scentlessapprentice9?feature=mhee#p/u/9/59FR27c9BwEhttp://imageshack.us/user/caffco
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During the past months I worked on the boom hoist and the rigging. I tried it out with a bit of cable and it seems to work OK. The next thing is the mechanism to push the A-frame in the working position. The real one has 2 hydraulic cylinders, but I have to come up with something else. I am also working on the winches. I plan to have the front winch for the lifting and the third winch to activate the luffing jib. Both winches will be removable and each one will have 2 small geared motors.   Kerst
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looking good man, wish i had the talent to build one from scratch
Brandon my youtube channelMy Facebook Page
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Location: Chucktown!
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Kerst, first off, amazing work!
Secondly, have you thought about using "bimba" cylinders to lift the a-frame? Maybe incorporate a small air compressor into the model to make them function?
Keep the pictures coming!
-Alvin.
The beatings will continue until Morale improves......
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AlvinB wrote:Kerst, first off, amazing work!
Secondly, have you thought about using "bimba" cylinders to lift the a-frame? Maybe incorporate a small air compressor into the model to make them function?
Keep the pictures coming!
-Alvin. Thanks! That is a great idea! I will look into it. Instead of a compressor I could even install a small tank, put some air in it with a bicycle pump. kerst
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Progress during the summer: I built the 2 winches. This proved to be quite complicated, because the space is very limited and there was just enough room for the electric motors in the frame underneath the winches. Each winch has 2 of them. Both winches can easily be taken out, like the real ones (see last picture). The rear winch will do the luffing jib and the front one the hoist. I will not install the middle one, because there is not enough space for the motors and I will also need that space to organize the electrical cables to go through the slewing ring. I also spent a lot of time on a mechanism to push up the A frame to the upright (and a bit) position, but I am not happy with the result yet. There are enormous forces involved, a lot more than I initially estimated. It works with 2 very small and slow winches, which pull up 2 levers over 120 degrees. Both cable have springs in them to provide some flexibility and tension. It needs heavier springs and stronger cable to with stand the forces.    Kerst
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Very nice work you got! Im still extremely facinated about how your slewing ring is made, where forces will be great when the model is completed. Very very nice piece of engineering.
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