roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Machining an sbf raw forged crank
Anybody done this ? I have a good sized cnc lathe, but no live tooling, or tooling for crankshaft machining. I have a raw forging coming, of which I hope to machine for RV8/sbb. I plan to make 1.70" off-set fixturing, for 3.4" stroke. I'll like start at #3 main, for linear start dimension, to better accomodate the longer ford dimensions. Onward, roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Machining an sbf raw forged crank
You going to rough turn it and then have it ground and polished?
Jim |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Machining an sbf raw forged crank
Yep, is the plan. Maybe have the rod journals rough/finish ground. They are already roughed for sbf, so "might" require welding, to make the RV8 off-sets. Onward, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Machining an sbf raw forged crank
Any skilled 4340 welders ? I've been quoted $100/journal, x (9), to submersed arc weld this crank. Not a viable option. How about argon flood tig ? What rod for 4340 ? Plan is to anneal,machine and nitide. Thanks, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Machining an sbf raw forged crank
It's here ! It's massive ! Must weigh 70+ lbs. Ford Windsor SVO,(Ford made). Capable of 4.1" stroke, a bit much for a RV8 ? More likely to be 3.4"= 302". Very small chance of finding 5L "vintage" anything class ? Onward, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Machining an sbf raw forged crank
Viola ! I've started making chips, kinda fun. Made quick/dirty V blocks, to mount crank on verticle mill. Faced snout end and center drilled, with 90 deg. spindle attachment,(very handy) ! Lathe is next. Onward, roverman.
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MGBV8 Carl Floyd Kingsport, TN (4514 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Machining an sbf raw forged crank
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DiDueColpi Fred Key West coast - Canada (1366 posts) Registered: 05/14/2010 03:06AM Main British Car: I really thought that I'd be an action figure by now! |
Re: Machining an sbf raw forged crank
Holy crap Carl!!
What a machine. The control that it exhibits is phenomenal. Do you think that crank is just a demo or does it actually fit something? Cheers Fred |
BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6470 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: Machining an sbf raw forged crank
Yes, well, just imagine the amount of programming that took. I'll guarantee you the crank is a mass production part. There's no way anyone would go to that much effort just for a demo.
Jim |
MGBV8 Carl Floyd Kingsport, TN (4514 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Machining an sbf raw forged crank
Don't know, Fred. Found it on a motorcycle forum. Pretty amazing.
MARTECH Machinery & Automation [www.martechcnc.com] Edited 1 time(s). Last edit at 08/01/2014 05:33PM by MGBV8. |
phongshader Justin Brown Ca (63 posts) Registered: 02/19/2010 04:03PM Main British Car: Locost Lotus 7 2.3 Duratec |
Re: Machining an sbf raw forged crank
any news or progress on the crank?
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: Machining an sbf raw forged crank
Alas, domicile outranks crank style. My current project is converting a modular classroom, to a residence. Seems like I never do nuthin-nice an easy. Cheers, roverman gone modular.
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tbo Tim Body St Thomas Ontario (221 posts) Registered: 01/27/2013 06:47PM Main British Car: 1954 Triumph TR2 stock 2 litre |
Re: Machining an sbf raw forged crank
Wow. That was amazing . Wish my Dad was still around to see that.He had a machine shop with a big lathe about six feet long and a Model A three speed transmission mounted on it. When he went from first second to third gear cut metal used to fly off that thing in big long curlyques like it was going out of style!Still makes me smile just to think about it
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