Big Ship Repair Job For Our Shop

[Adam in WI]

Sign me up!

 

[jackieschmidt]

Holy fright....900 rpm thru a 4-1 gives me 225RPM...and a 100 inch prop turning 225 RPM gives me aprox 6500SFM.....I'm surprised the prop tips don't shear off!!

On those 1¾ bolts....do you roll the threads or just screw cut em?

Aaron

The threads are cut.
There really isn’t a lot of torque on the bolts, as the gears are set in Chockfast Chocking compound. It is a two part mix that is poured between the gear feet and the foundation. It has round a 6000 psi compression strength. The body fit bolts keep the gear from shifting.

I generally give the bolts .001 interference fit, soak them in liquid nitrogen, and slip them in.

here is a picture of a EMD Engine Pad with body fit bolts and the poured chock.

 

[Brians356]

Since this thread is for big stuff, I thought you all might like this. This hammerhead crane was built in 1933 at the south end of Pier 6 in (then) Puget Sound Navy Yard. Rated 250 tons working load, here it is tested at 350 tons with a load consisting of four 16-inch guns, four 8-inch guns and a test weight suspended from chain falls. Note the men standing near the ends of the upper gun barrels. Nice work, if you can get it! Also a battleship is berthed adjacent to Pier 6, I believe BB-44 USS California.


-

 

[Brians356]

The threads are cut.
There really isn’t a lot of torque on the bolts, as the gears are set in Chockfast Chocking compound. It is a two part mix that is poured between the gear feet and the foundation. It has round a 6000 psi compression strength.

How thick can that chocking compound layer be? I'd like to use it to level a four-legged steel table I would bolt to an uneven concrete floor.
-

 

[Carl S]

Jackie what grade of wire-electrodes do you use on your welding applications.also is there specific weld classes you use on some of the joints F class F2G.thats some of the weld classes used over here on structural applications.regards

 

[jackieschmidt]

How thick can that chocking compound layer be? I'd like to use it to level a four-legged steel table I would bolt to an uneven concrete floor.
-

For an application such as you describe, they recommend Chockfast Gray. It is less expensive than the Orange. They do like to keep the chocks at least 1/4 inch thick and no more than 1 1/2.

we used it to set the tracks in for our 15 ton Gantry Crane in one of our buildings. We simply set them straight, leveled them with about an average 3/8 inch between the track and concrete, built the dams, and poured The chocks.

 

[jackieschmidt]

Jackie what grade of wire-electrodes do you use on your welding applications.also is there specific weld classes you use on some of the joints F class F2G.thats some of the weld classes used over here on structural applications.regards

Most of our welding is submerged arc stainless on the large shafts and rudder stocks we build and repair. The main alloys are 309L as being compatible with the carbon steel core and 316L as the cover pass for corrosion resistance. All of our wire has to to meet ABS standards.

For our fabrication, we use a lot of 7024 Jet Rod and 7018 Low Hydrogen.

 

[jonbearman]

You guys did a stellar job fixing the driveshaft support. It is gorgeous Jackie.

 

[Carl S]

Most of our welding is submerged arc stainless on the large shafts and rudder stocks we build and repair. The main alloys are 309L as being compatible with the carbon steel core and 316L as the cover pass for corrosion resistance. All of our wire has to to meet ABS standards.

For our fabrication, we use a lot of 7024 Jet Rod and 7018 Low Hydrogen.

Very interesting work Jackie,I would be in my element working with you gentlemen.especially turning those large shafts.

 

[Captain Long John]

My sister’s boyfriend was in the Naval Academy when he took me on a tour of the Carrier Consrellation in the 1961. I remember the shaft bearings were Lignum Vitae, which was “self lubricating.” So that was more than 60 years ago.

Great work, Jackie.