Fitting a large propeller to shaft

[jdh47]

I'll bet it's not especially cheap either. I've used some patternmakers resin called Tuf-Fil before and it's not cheap but it is good for it's intended purpose.

 

[jackieschmidt]

How do you contain such a liquid in application?
-

You use a soft foam snug in the back, on the sides and in the front. You tack weld 1/4 inch thick rails about 1/2 inch from the gear feet to form a dam, about 1/2 inch higher Than the pour. You seal the edges with silicone, then pour the ChockFast in with a rise. It takes 24 hours to set completely.

When setting gears in ChocFast, it is customary to body fit all of the hold down bolts, as the torque on the bolts is quite light. As an example, if you set this particular gear in ChockFast, the torque on those 1 1/2 inch bolts would only be about 200 pound feet, as any tighter will start to compress the chock. On shims, you use A slugging wrench.

 

[rwj]

When setting gears in ChocFast, it is customary to body fit all of the hold down bolts, as the torque on the bolts is quite light. As an example, if you set this particular gear in ChockFast, the torque on those 1 1/2 inch bolts would only be about 200 pound feet, as any tighter will start to compress the chock. On shims, you use A slugging wrench.

Have Superbolts/Supernuts gained acceptance in marine applications? They make it easy to control preload (light or high) and are a lot safer than using slugging wrenches in tight spaces!

 

[PhilKeil]

Jackie,
Do the red rings act to steer the thrust from the props?
Curious

 

[jackieschmidt]

Have Superbolts/Supernuts gained acceptance in marine applications? They make it easy to control preload (light or high) and are a lot safer than using slugging wrenches in tight spaces!

most in the Marine Industry would consider the Super Bolt Super Nut concept a solution to a non existent problem.

Heck, I tried to get them to use Vibracons on this installation instead of those 3 inch spacer blocks and shims. True, the up front cost would be more, but they are good for the life of the vessel And solve the problem of irregular foundation pads and time consuming shimming.

SKF

www.skf.com

They said no.

 

[dave@aDave]

When I was young and starting out working as a draftsman, I worked in an engineering department that designed and the shop built aluminum rolling mills. We took our coffee breaks in the shop where we would see the equipment being built.

One day walking to our break area I saw a man measuring the OD of a large roll, probably 30-36" in diameter. The micrometer was huge and he was careful, getting the right feel for his measurement. Then he put the mic down and measured the opening on the mic with his tape measure. I think I almost laughed out loud.

Richard

Must have been a former government worker.
The Government motto:
1. Measure it with a micrometer.
2. Lay it out with chalk.
3. Cut it with an axe.

 

[Sniperhandle]

What is the size of the Key/Keyway? I'm going to guess about 2 inch?

 

[jonbearman]

Hey Jackie, your picture's remind me of my Farrell days and the last boring mill was sent to canada and the table weight was 96 tons and the bed was 128 tons.It had a 150 hp electric motor and the table rode on hydrastatic pockets which I spent 45 days in Montreal setting the machine up. The cross rail was right around 100 tons. . In another words big stuff. The last lathe I worked on was a driveshaft lathe for the Navy . It was over 80 feet in length and roughly 10 feet across. The chips it removed weighed a lot. I really like working with big stuff so I admire your craftsmanship. Where do you work out of or do you travel to each rebuild.

 

[jackieschmidt]

Hey Jackie, your picture's remind me of my Farrell days and the last boring mill was sent to canada and the table weight was 96 tons and the bed was 128 tons.It had a 150 hp electric motor and the table rode on hydrastatic pockets which I spent 45 days in Montreal setting the machine up. The cross rail was right around 100 tons. . In another words big stuff. The last lathe I worked on was a driveshaft lathe for the Navy . It was over 80 feet in length and roughly 10 feet across. The chips it removed weighed a lot. I really like working with big stuff so I admire your craftsmanship. Where do you work out of or do you travel to each rebuild.

Our shop is on the East Side of Houston. Actually in Jacinto City.

I don’t travel far. We have one big customer down in Corpus Christi, and one in Port Arthur. But 90% of our work is done in the Houston area.

we specialize in working on Inland Push Boats.

 

[Scalloper]

We have a couple of 11 inch diameter prop shafts out of a Harbor Tug in for rebuild.

One of the operations is fitting the prop‘s taper to the shaft. The props are 112 inches in diameter X 102 inches pitch. Each prop is rated at 2500 HP.View attachment 1273938View attachment 1273940View attachment 1273941Here are a couple of pictures.View attachment 1273942

As a commercial fisherman for 33 years and a current commercial boat broker, I can tell you those props didn't come in a cracker Jack box

 

[jackieschmidt]

Jackie,
Do the red rings act to steer the thrust from the props?
Curious

Those are called Kort Nozzles. They are stationary.

They increase the efficiency of the prop, just as an induction ring around a fan increases it’s efficiency.

They downside is they act like huge vacuum cleaners, increasing the possibility of objects getting sucked up.

 

[PhilKeil]

Those are called Kort Nozzles. They are stationary.

They increase the efficiency of the prop, just as an induction ring around a fan increases it’s efficiency.

They downside is they act like huge vacuum cleaners, increasing the possibility of objects getting sucked up.

Thank you for the explanation. Makes sense.
phil