Forum: Scale Buildings, Warehouses and Structures.
12-21-2014, 04:27 PM
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Replies: 5
Views: 8,369
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Forum: Scale Buildings, Warehouses and Structures.
12-21-2014, 08:29 AM
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Replies: 5
Views: 8,369
Re: small angle iron
Those stores inventory of angle are too big. I need 3/16 x 3/16 and 1/8 x 1/8 sizes.
Thanks regardless,
bartles
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Forum: Scale Buildings, Warehouses and Structures.
12-20-2014, 06:21 PM
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Replies: 5
Views: 8,369
small angle iron
I am building a scale model dragline. I can not locate a source of small aluminum or steel angle iron for the boom. I have google searched with not much luck.
I would appreciate some help if...
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Forum: Construction Equipment
11-26-2014, 04:51 PM
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Replies: 1
Views: 3,182
Swing Test
Progress is slow but I think I have a swing system that will be smooth and very similar to the OEM machine in speed and operation. I am using a slipper clutch from SDI to simulate the friction drives...
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Forum: Construction Equipment
03-31-2014, 08:09 PM
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Replies: 19
Views: 9,584
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Forum: Construction Equipment
03-31-2014, 08:07 PM
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Replies: 19
Views: 9,584
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Forum: Construction Equipment
03-31-2014, 05:05 PM
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Replies: 19
Views: 9,584
Re: 305 Koehring dragline project
....pardon my question, but I must admit I am not familiar with all the in's and out's of the forum...so I just keep adding to my original post?
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Forum: Construction Equipment
03-20-2014, 06:22 AM
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Replies: 19
Views: 9,584
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Forum: Construction Equipment
03-12-2014, 04:00 PM
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Replies: 19
Views: 9,584
305 Koehring dragline project
Well I have made some progress.......the servo speed is a little slow but I plan to increase the system voltage to gain another 20%...the line pull is very strong.
Comments and suggestions are...
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Forum: Electronics tech
02-16-2014, 03:46 PM
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Replies: 7
Views: 2,965
Re: "paralleling" servos
I just started fabrication of the carbody, and the drums are finished. When I get the drums mounted I take some photos and pass them along. I have spent a lot of time making working drawings from...
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Forum: Construction Equipment Tech
02-16-2014, 06:35 AM
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Replies: 5
Views: 2,164
Re: Best Material for Excavator tracks
Well, I am beginning to sort out what way to go with my dragline project. Can you provide me the details using flat bar Al with Channel and #25 chain...
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Forum: Electronics tech
02-15-2014, 04:27 PM
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Replies: 7
Views: 2,965
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Forum: Electronics tech
02-06-2014, 05:30 PM
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Replies: 7
Views: 2,965
"paralleling" servos
I am building a small dragline and have decided to use servos from my rc helicopter days for power. The contemplated arrangement would have two servo's each with a pinion, both driving a larger gear...
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Forum: Construction Equipment Tech
01-31-2014, 06:35 PM
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Replies: 3
Views: 1,853
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Forum: Construction Equipment Tech
01-30-2014, 12:16 PM
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Replies: 3
Views: 1,853
Sourcing Slip Rings
Can I get some advice on retail source for "pancake" type slip rings. I am building a small dragline and have a clearance problem (thickness) for a 4 conductor slip ring to deliver power to the...
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Forum: Construction Equipment
12-19-2013, 06:36 AM
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Replies: 46
Views: 21,675
Re: Cable excavators of the 1940's and 50's
Between Rustybucket, modelman, and 9W's work I am beginning to get cold feet about my little 3/4 yd dragline project! Just kidding, what wonderful craftsmanship guys! I agree, the cable machines...
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Forum: Construction Equipment
12-13-2013, 05:23 PM
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Replies: 19
Views: 9,584
Re: 305 Koehring Build Start
Nice work indeed...I am about finished with the drag drum. I am using cold roll and machining it as a one piece part. This Chinese lathe I have is a little loose to say the least, so I think I...
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Forum: Construction Equipment
12-09-2013, 05:45 PM
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Replies: 19
Views: 9,584
Re: 305 Koehring Build Start
I probably bought the parts book you saw! It was pricy but really helps to scale components from for sure. I also bought a sales brochure from that era that has some great pictures to help me.
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Forum: Construction Equipment
12-08-2013, 01:19 PM
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Replies: 19
Views: 9,584
Re: 305 Koehring Build Start
My plans are to use two modified servos, via pinions and a bull gear arrangement from one of my helicopters, for each drum. I have a bunch of servo's, gears, pinions, bearings, shafts from my rc...
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Forum: Construction Equipment
12-08-2013, 07:49 AM
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Replies: 19
Views: 9,584
Re: 305 Koehring Build Start
I think the drum barrel area will either need less weld or I might bore out the flanges and well the barrel from the outside of the flange....definitely need less weld metal to machine lagging...
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Forum: Construction Equipment
12-07-2013, 05:20 PM
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Replies: 19
Views: 9,584
305 Koehring Build Start
Well I have jump in with my plan to build a scaled version of the Koehring 305 Dragline. My father owed two of these during my years at home so "we" have a history. I built the attached drum today,...
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Forum: Construction Equipment Tech
12-07-2013, 06:58 AM
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Replies: 9
Views: 4,128
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Forum: Construction Equipment Tech
12-06-2013, 08:24 PM
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Replies: 9
Views: 4,128
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Forum: Construction Equipment Tech
12-06-2013, 06:04 PM
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Replies: 9
Views: 4,128
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Forum: Construction Equipment Tech
12-06-2013, 02:49 PM
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Replies: 9
Views: 4,128
Wire Rope For Dragline/Crane Build
Would appreciate some input for what I should use for cable/wire rope for a dragline build and where to source the material. My drums will be 33mm in diameter. I want to be sure I have machined a...
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