done this many times. need a 150 ton pancake jack and TWO rosebuds.also blocks of wood between prop and nut so when prop jumps off it will not f..k up the nut.
from heating it? it's a maganese bronze alloy, which does very well with heat. as far as balancing is concerned, the prop shaft doesn't spin over 300 rpm so balancing is not required. But good quesitons.
@@machinist1337 I have been watching several other videos about various sized ships and every one shows EXTREMELY accurate and NON impact placement of props on the shafts and a couple where the assembly crews working on Panamax style ships had to remove the prop because the foreman from the owner company was not there to supervise the placement of the prop so he could assure there was zero damage regardless how minor during the placement of trhe prop to its full depth on the shaft. If the guys are so anal about a 22.000 lb prop on a 1 ft diameter hardened steel shaft, what these guys are doing would give the foreman on the supersized ship a full blown heart attack!
@@Gizmologist1 to a certain extent you are right. The large ships have documented procedures for on how install their 1million dollar propellers. These guys using a hammer on the blades is not standard practice. But using heat and driving the prop up the taper is standard practice. Instead of hitting the blades they should have put more heat and used a bigger hydraulic setup.
nothing more annoying/painful than trying to remove a prop. if the prop is taken off annually its fine. but if its not been off in years... WOOOO! WEEEE! now you have a fight! nothing beats heat, torque and a good tap though.
If the prop has a higher rate of expansion then the shaft material it will expand when heated enough to loosen the grip. A reasonable sized puller to apply a constant pressure and well placed shock against the hub with A hammer should work .Beating the blades just does damage and rings like a bell. Big prop hubs are A big heat sink and the blades act like cooling fins. Use multiple torches to get a lot of heat into the hub and then hit the hub with a few well placed hammer blows. If the prop and shaft are the same material (bronze) Then you need a BIG PULLER and try rapid heating and hammering. Some times setting a Puller very tight and heating and striking and leaving it for an hour or over night will pop it unattended .
Hitting the blades on no no wrong place to hammer on need two torches the three torches to heat that thing up and people may not know this but paraffin wax works good on getting things off sometimes better than PVC blaster
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Nosotros hacemos lo mismo pero la diferencia lo hacemos con dos boquillones de calentar por el diámetro de la manzana asungu. Y igual usamos bomba hidráulica que no ahí quite de ponercelo pero lo único q no me gusto porque golpean la Elice de la propela eso se golpea en la manzana alado del cuñero
OK then expert. How would they fit an induction coil around it? I see three big reasons why they couldn't - blades. Are you really that stupid? They had gas to hand and so they used it - why would they have even more gear laying about?
Yes but sometimes they just don't want to come off ,we heat them at 3 o'clock and nine o'clock only so the shaft doesn't get too hot ,then hit hub to shock the thing off .
@@pauldavidson6321 heat the Bearings inner ring not the shaft... When you pour the water on it... The inner ring will expand becase there is little play between inner ring and balls
@Don Olypopper it's obviously a work shop... if i would be a ssl owner and would order repairs I would sue this people... modern propellers are made out to minimize the consumption... Any damage severely affects that...
Need quicker heat on prop..slow heating will allow shafts to warm also...several torches should do evenly placed around hub... stronger strong back (without deflection or bending) would also help
C17H25N Worked for 35 yeas in the Marine repair industry pulled just about every kind of props you can imagine. from 2 lbs to 25 tons. Used rose bud to internal hydro. But I cringed when I saw that moron smacking the blades WTF. as a supervisor on the job I was the only one to swing a sledgehammer and it was never anywhere near a blade.
@@preselrattananikum379 Not everyone has access to Liquid Nitrogen or Ammonia under 15psi of vacuum in a pinch boss. But you are most definitely correct and is less fatigue on the material if done slowly. maybe the union boys have time to stand around like that 🤷♂️
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i agree,being a Millwright myself i would use another method,one good method is using high pressure water,around 2000 bar,injected into the hub and into the morse taper,however the hub has to have provision for it ie a threaded hole on either side of about 3/8" BSP thread and high pressure hydraulic fittings and hoses.
what are you talking about yes they would. i worked ina shipyard for 11 years i have a formal apprenticeship and taper fit propellers like this are heated on.
