RE: {LVL1} Re: Looking to borrow a chain hoist to remove the large riser from Bridgeport milling machine

[McCarthy, Patrick (GE Appliances, Non-GE)]

I was thinking the same thing… That beast is GINORMOUS but it has a home where it is… Power (mostly) local, and it is fine.

The only reason there’s a pallet there is because it was not taken off while we were still VERY gun shy about standing water (Remember the old space? We put EVERYTHING on pallets)

I think that taking the pallet out from under it, and removing the riser, would be 2 good things.

If we ever need to move it, a chain fall will be required, so making step 1 lifting it and putting a STURDY pallet under it for the move would not post a problem.

 

That thing is NOT intended to be moved…. EVER. Making something to give it the ability…. Kinda like adding a skid under the Washington monument… “just in case”

 

 

 

 

_______________

Patrick McCarthy

Office 502-452-4071

Mobile 502-939-1756

 

From: lv...@googlegroups.com [mailto:lv...@googlegroups.com] On Behalf Of Patrick Joyce
Sent: Tuesday, October 25, 2016 9:43 AM
To: LVL1 - Louisville's Hackerspace
Subject: EXT: {LVL1} Re: Looking to borrow a chain hoist to remove the large riser from bridgeport milling machine

 

The main reason for the pallet still being there is that step one for removing the pallet is lifting the mill. It's been sitting in the same place for over a year now with no real reason to move it, it's a bit unnecessary to require that capability now.

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[David Ortiz-Grob]

Ha! That makes sense though. Is there an overhead beam in the metal shop we could use to lift it from? I know the main space has the steel I beams we can get around and above to use but I don't think there's something above the mill's current location.

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[Greg Miller]

The mill can be moved over short flat distances by using (e.g.) 1/2" steel rods inserted underneath it as rollers.  It's not a huge ordeal to tilt it enough to get them underneath it.

[Luslugger]

The general rule when moving a machine is to use cables and straps.  Chains are not a class solution.   A machine like this is ussualy "picked".  That means lifted by attaching to the top of the machine.  The threads to do this are built into the machine.  Put an eye bolt in the threads and pick from there.  I would remove the head and set it on the floor, remove the spacer,  pick and remove the skid, reinstall head.   A crane like an engine hoist, less than 200 dollars,  2 cloth straps with flat eyes, 25.00 dollars,  chains 0.00 dollars.
Bob S

[Lockadoc]

I can get an engine host

If that need to be used. 

Bill S

Sent from my iPhone

[David Ortiz-Grob]

That's basically the plan. I think the ram already has a eye bolt in it so a chain hoist with a hook on the end should fit pretty well. 

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[McCarthy, Patrick (GE Appliances, Non-GE)]

Although I do not think you’ll be rambunctious, it might be a good idea to use a hook that has a safety clip…

I say this because:

Once upon a time, long ago, I was assisting a team that was lifting a 200GPM main fire pump out of a main space on an aircraft carrier… It was 8 stories from the bilge level to the level we needed it. The pump motor weighed well in excess of a Ton. We used the same setup: Eyebolt –>  Hook –> 8 deck chain fall. When the team got it right up to the deck where we needed it (I was supposed to be “receiving” it for repair/rewind) The CPO began the process of lowering/pushing to get it over to the edge of the opening where we had another hook ready to take the load and move it over a wheeled platform.

Just the chief got a hold of it, he decided to re-position it(Loss of situational awareness moment) and so he turned the motor ½ way.

The chain was too taut to allow itself to be twisted

The hook did NOT have a safety. It also was not designed to swivel

So, the hook simply turned OFF of the eyebolt.

1 second it was there, then it was hovering, then it blinked out of sight…..

Then there was a THUNDERING boom…

120’ to the bottom of the bilge, 2000lb pump, landing shaft first (3” dia. shaft)

 

(fun math time)

Velocity on impact = (2*32.2*150)^1/2 =98.29 ft./s

Rate of Deceleration = (98.29)² / (2*4 ) (Traveled 4 feet after impact) = 1,207.5 ft./s²

G force = 1,207.5/32.2 = 37.5G

Force of Impact=2000*37.5=75,000 lbs. force

With Surface area of 7.1”… The Impact pressure was ~10,600 psi

 

The pump penetrated the inner hull of the aircraft carrier, with the shaft making it 4 feet thru ************* that is between the inner and outer hull

 

MANY people went to captain’s mast that day….

 

 

Bottom line,

 

Is good J

 

 

 

_______________

Patrick McCarthy

Office 502-452-4071

Mobile 502-939-1756

 

[David Ortiz-Grob]

100% agree on the safety clipped hook.

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[Ben Hibben]

Time to do this folks!  Show up and help if you want to help us figure out what to do.

Blenster

ᐧ