before I built my shop I anchored a piece of 14" .375 wall pipe in the 10' ground for when I got around to building a jib boom to put stuff in the lathe and work on the drill rig. Im getting close to wanting it enough to start working on it .I would like to use a bearing assembly? that rotates around the whole piece of pipe for the arm but I'm not sure how to make it. I could easily build a offset style like this http://www.directindustry.com/prod/a...75-542892.html that would load the pipe funny though would rather build one like this http://www.safaleotcrane.com/wp-cont...016/02/4-1.jpg but not sure how the bearing system is set up in one of these any advice would be great this is my private shop so no employees in here. but I also want it safeDo not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:Originally Posted by idacalbut I also want it safe
Reply:Originally Posted by CEPYou may want to talk to an engineer. I designed my bridge crane, but I e-mailed the Auto-Cad drawings to the head of the company we worked for engineering department. He told me what size beams to use.
Reply:Your first place to start is your pipe column. It isn't very strong and will be your limiting factor. No use to overbuild the rest of the crane and actually loose load capacity because you have to heavy of beam for the jib. How much concrete width, depth, and strength do you have around your column, and how much steel?Small capacity cranes such as you have typically use a Timken bearing at the top to both support the weight of the jib and load, as well as serve as the upper centerline of rotation. The lower rollers then help support the arm. Large jibs will use a thrust bearing at the top of the column and rollers on opposing sides to take all the moment loads from the jib and load.If you have a lathe it would be simple enough to make a cap for your column that would hold 1/2 of the Timken. I have assembled a few of the smaller cranes, but I don't remember which part held the cup or cone, if it matters.
Reply:I have been doing some more reading on it it defiantly will not be as heavy as I was hoping I need 18' of reach the 14" is down 10' in a 36" bore that was filled with concrete.Do not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:Originally Posted by idacalI need 18' of reach
Reply:Swag says you will have no load capacity at 18'. You may have a pull pot in the floor with deep embedment.I have some factory information on a 4 ton, 20' jib crane. The column is 24" od, 1" thick. The beam is 24", with a c channel cap on top. The weldment weight is 100#/ft. The column is sleeve mounted into the floor. The sleeve is 5' tall. A 12" rat slab was poured to set the sleeve. The sleeve weighed about 800#, and was about 800# buoyant when surrounded by concrete, so it had to be firmly anchored to the rat slab. The factory called for an 8' x 8' mounting pier if unsupported, slightly smaller was acceptable if it was anchored by the floor. Upper and lower layers of steel on 6" centers, #5 bar.There is a commercially available crane called a semi-gantry that may be a solution for a crane for bays that are to wide to span with a bridge crane. One end runs on a crane rail like a conventional bridge crane. The other end is is a A frame with wheels like a gantry. I saw a new one on a semi trailer and talked with the driver. It came from a Kone crane plant. The span was about 40', with about 20' under the beam. They had 160' of runway supplied.
Reply:Thank you bent I gues I have a nice anchor point in the shop when I need to pull something that was the kind of numbers I have been trying to find didnt realize how heavey duty those set ups actually areDo not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:Checkout Wallace Gantry, great info, http://www.wallacecranes.com/jibfloor.htmI got the picture but not the specs, see website. Attachment 1485331 Floor Mounted Jib Cranes
Reply:Im still dreaming anyway but how do you guys load heavy pieces into the lathe? 700 lbs max Would filling the mast pipe up with 5000 psi cement with glass in it after assembly make any Difference? How about installing a piece of 8" sceduale 80 inside the 14" center it up then cement it up? I can see I didnt make it heavy enough But how do I do the calcs for next time. my local welding shop has one installed in there welding bay lighter than i was wanting to build that I have seen with well over a ton on it but they are getting a couple inches of deflection and thats a little spooky. After talking here im not going to be doing this build but im interested in what goes into the numbersDo not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:Originally Posted by idacalAfter talking here im not going to be doing this build but im interested in what goes into the numbers
Reply:You may get it with a heavy rebar cage and concrete inside the pipe .I agree with CEP get a engineer to look over want you want to do
Reply:I will have an engineer buddy look over my plans before I start cutting metal so this on hold for a while I need at least a 1/2 ton or its not worth the the time and money spent on this project don't need a tall overhanging deathtrap that I have to worry about everytime I useDo not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:I expect your best avenue is just take the beating on the existing pillar and cut it out. Scour for a used factory built jib crane and install it complete. I prefer the sleeve mount to the floor mount. Either will require the same sized foundation block in the floor. With the sleeve mount, there are no anchor bolts or gussets to trip over and the above grade profile is much smaller.
Reply:I don't know how much space you have to maneuver but, it sounds like a small forklift may e a good alternative. I have a Clark Clipper it is 62" long, mine has no cage and with the mast down will fit through a 30" door. The other option is a monorail crane mounted to the roof joists.Steve from SoCal now in HutchMiller Dynasty 300DX Coolmate3 Speedway TorchMiller XMT 450 MPa plus with D-74 MPa Plus Miller Bobcat 225 NTHypertherm Powermax 45And a whole bunch of machines
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