|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
06-13-2015, 09:24 PM | #1 |
Senior Member
Join Date: May 2010
Location: pgh.pa.
Posts: 321
|
revisit : gravity bends a crank
gravity may very well bend a crank stored horizontally.a very large electrical manufacturer,producing large generators for powerplants,would leave armatures in process of machining,rotating on a lathe,even when the plant was inactive(holidays,weekends,shutdowns,etc.)these large forgings would develop runout if left hanging stationary on lathe centers.
|
06-13-2015, 10:13 PM | #2 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,645
|
Re: revisit : gravity bends a crank
Ah, shucks, I opened this thinking I'd read about more of Molly's escapades.
__________________
Alan |
Sponsored Links (Register now to hide all advertisements) |
|
06-14-2015, 02:47 AM | #3 |
Senior Member
Join Date: Apr 2011
Location: South pacific island
Posts: 1,724
|
Re: revisit : gravity bends a crank
They used to have vertical lathes for that reason.
__________________
<Link> This is how we roll<Link> "I'm Convinced that no one really reads posts anymore; they just fabricate what they think the post says then ramble on about red herrings."--Bob Outcasts rules of old cars #1 Fun is imperative, mainstream is overrated #2 If they think it is impossible, prove them wrong #3 If the science says it impossible you are not being creative enough. #4 No shame in recreating something you never had #5 If it were not for the law & physics you would be unstoppable |
06-14-2015, 04:43 AM | #4 | |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: revisit : gravity bends a crank
Quote:
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
|
06-14-2015, 08:24 AM | #5 |
Senior Member
Join Date: Dec 2010
Location: San Antonio Texas
Posts: 636
|
Re: revisit : gravity bends a crank
Glad I set my coffee cup down first
|
06-14-2015, 08:57 AM | #6 |
Senior Member
Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
|
Re: revisit : gravity bends a crank
Sponsored Links (Register now to hide all advertisements)
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES |
06-14-2015, 10:34 AM | #7 |
Senior Member
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
|
Re: revisit : gravity bends a crank
Ride Molly, ride.
|
06-14-2015, 06:01 PM | #8 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,319
|
Re: revisit : gravity bends a crank
I have 2 8BA cranks that have been lying in their sides on the floor of my shop for close to 20 years. Next week, I will be bringing them in to be checked to see if they can be used in an engine I am building. I will be having the runout of the main bearings checked. Then I think we should know for sure.
An interesting fact is that the '49-'51 Ford shop manual gives a technique for checking a block for crank runout, but not the crank itself. (Their solution if it is not in spec? Replace the block!) |
06-14-2015, 06:14 PM | #9 |
Senior Member
Join Date: May 2010
Location: Napier, New Zealand
Posts: 2,001
|
Re: revisit : gravity bends a crank
Where can I get a crank that's been to space and back?
|
06-14-2015, 06:24 PM | #10 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: revisit : gravity bends a crank
"An interesting fact is that the '49-'51 Ford shop manual gives a technique for checking a block for crank runout, but not the crank itself. (Their solution if it is not in spec? Replace the block!)"
That's strange. We were sleeving main bearing saddles in the 50's so the technology was current. Must have been a marketing thing. |
06-14-2015, 06:33 PM | #11 |
Senior Member
Join Date: Nov 2012
Location: Tauranga, New Zealand
Posts: 726
|
Re: revisit : gravity bends a crank
That might be another reason why you could buy semi finished main bearings, so you could bore them to compensate for mis aligned block main tunnels?????
|
06-14-2015, 06:34 PM | #12 | |
Senior Member
Join Date: May 2010
Location: so cal, placerville, vegas
Posts: 1,394
|
Re: revisit : gravity bends a crank
Quote:
|
|
06-14-2015, 06:39 PM | #13 |
Senior Member
Join Date: Jun 2013
Location: west grove Pa.
Posts: 238
|
Re: revisit : gravity bends a crank
Man!! You Guys have too much time on your hands! Yeah I read every post Pete
|
06-14-2015, 06:52 PM | #14 |
Senior Member
Join Date: May 2010
Location: Auburn, MA
Posts: 2,106
|
Re: revisit : gravity bends a crank
Is there anyone here who has had to throw away a crank because it was not stored properly? Installed an improperly stored one and ruined a new motor? A very large armature has a lot of weight in the middle of a much longer shaft. They could have sized a larger shaft but did not need to and had significant weight savings.
__________________
“The technique of infamy is to start two lies at once and get people arguing heatedly over which is true.” ~ Ezra Pound |
06-14-2015, 07:02 PM | #15 |
Senior Member
Join Date: Oct 2013
Location: Dayton Ohio
Posts: 104
|
Re: revisit : gravity bends a crank
Another saggy crank theory gets the shaft.
|
06-14-2015, 07:46 PM | #16 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: revisit : gravity bends a crank
Quote:
The sleeve is cut in half plus kerf. It is set in the saddle and several holes are drilled through the sleeve and into the block about a 1/4 inch. Brass rod is cut into appropriate lengths to use for rivets. The rivets are installed and peened over. The excess sleeve is surfaced flush to the pan rail or block surface.. The mainline is then bored to finish size. Carrier bearing bores in rear ends are fixed the same way. |
|
06-15-2015, 09:17 AM | #17 | |
Senior Member
Join Date: May 2010
Location: Central Iowa
Posts: 691
|
Re: revisit : gravity bends a crank
Quote:
Whether or not the deflection caused by gravitational forces is an issue or not is relative to the magnitude of the deflection and the application. In the case of an automobile engine, any deflection caused by either storage method is a non-issue.
__________________
Mike Wanted: - '32-34 Open Cab Pickup (RPU) parts and documents/articles/info - ARDUN parts |
|
06-15-2015, 09:32 AM | #18 |
Senior Member
Join Date: May 2010
Location: Mid coast Maine
Posts: 1,878
|
Re: revisit : gravity bends a crank
I think if you had a crank shaft ground and put it in the engine the caps tightened up would bend it back and the centrifugal force and heat would be ok.
I think this is a bunch of old tales.Like they used to say if you took the dist out it would never run agsin.And the other stupid thing was and engine runing backward. Seems it not oil and more. |
06-15-2015, 10:23 AM | #19 |
Senior Member
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 368
|
Re: revisit : gravity bends a crank
Just received a Western Union telegram from Molly: "Boys, I've really enjoyed all this talk about crankshafts. Stop. Brought back some great memories. Stop. Hope you enjoy your V8's, whether your cranks are straight or not. Stop. For God's sake, stop. Love, Molly. Stop."
|
06-15-2015, 12:59 PM | #20 |
Senior Member
Join Date: May 2010
Location: pgh.pa.
Posts: 321
|
Re: revisit : gravity bends a crank
itslow,maybe you can read the previous posts for your answer.
|
06-15-2015, 01:27 PM | #21 |
Senior Member
Join Date: May 2010
Location: Crowley, TX
Posts: 328
|
Re: revisit : gravity bends a crank
If you store them on end, do they get shorter????
|
06-15-2015, 01:33 PM | #22 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,645
|
Re: revisit : gravity bends a crank
Length is relative to hardness and age. You must be a youngster if you have to ask.
__________________
Alan |
Sponsored Links (Register now to hide all advertisements) |
|
06-15-2015, 01:34 PM | #23 |
Member
Join Date: Jan 2011
Posts: 78
|
Re: revisit : gravity bends a crank
Give it a half turn every 6 months! It'll keep it straight.
Harry |
06-15-2015, 01:41 PM | #24 |
Senior Member
Join Date: May 2010
Location: Lehighton Pa
Posts: 1,085
|
Re: revisit : gravity bends a crank
|
06-15-2015, 03:18 PM | #25 |
Senior Member
Join Date: May 2010
Location: Chester Vt
Posts: 8,860
|
Re: revisit : gravity bends a crank
When in the Navy we had a jacking gear that rotated the propeller shaft so the screws didn't bent the shaft. Good idea, keep them shafts turning.
|
06-15-2015, 03:52 PM | #26 |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,409
|
Re: revisit : gravity bends a crank
|
06-15-2015, 04:00 PM | #27 |
Senior Member
Join Date: May 2010
Location: Yakima Washington
Posts: 913
|
Re: revisit : gravity bends a crank
|
06-15-2015, 05:23 PM | #28 |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: revisit : gravity bends a crank
|
06-15-2015, 05:59 PM | #29 |
Senior Member
Join Date: Dec 2010
Location: North of sandy ago, CA.
Posts: 2,064
|
Re: revisit : gravity bends a crank
Ron
When you were in the navy the ships still had sails. B
__________________
Works good Lasts long time |
06-16-2015, 02:23 PM | #30 |
Senior Member
Join Date: May 2010
Location: pgh.pa.
Posts: 321
|
Re: revisit : gravity bends a crank
Anyone have a picture of that giant vertical lathe referenced above?The company had dedicated rail cars to ship these large powerplant components.A vertical lathe that tall would be quite impressive.
|
06-16-2015, 06:04 PM | #31 |
Senior Member
Join Date: Aug 2014
Location: MA
Posts: 888
|
Re: revisit : gravity bends a crank
i got rid of my old crank (x wife) & I got shafted in court - BIG time
__________________
Thanks - 30-9 1939, 1940 |
06-16-2015, 06:20 PM | #32 |
Senior Member
Join Date: Jul 2011
Location: SF Bay Area
Posts: 6,645
|
Re: revisit : gravity bends a crank
...Sorry, not funny, but had to laugh!
__________________
Alan |
06-16-2015, 06:25 PM | #33 |
Senior Member
Join Date: Aug 2014
Location: MA
Posts: 888
|
Re: revisit : gravity bends a crank
I can laugh now w u......
__________________
Thanks - 30-9 1939, 1940 |
|
|
Sponsored Links (Register now to hide all advertisements) |
|