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Turning down a crank question (machinist)
#2279598
03/31/17 03:03 PM
03/31/17 03:03 PM
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Joined: Jan 2017
Posts: 274 Granbury TX
Prochargedmopar
OP
enthusiast
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OP
enthusiast
Joined: Jan 2017
Posts: 274
Granbury TX
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What rpm do I turn the crank on the lathe to cut down the counterweights when going to b block?
It's a forged unit. How do I keep from putting dent marks in the snout when chucking it up? Thanks.
"Old" member Registered: Sep 2001 Lost my credentials, I'm Back!! LOL 71 Ply Satellite Procharged 73 Dodge Dart Swinger 73 Ford F-100 390/Sniper efi/back to carb 01 Town and Country Limited 08 Dodge 2500 6.7 5" Deleted 02 Mercedes C230K 19 Camry
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Re: Turning down a crank question (machinist)
[Re: Prochargedmopar]
#2279723
03/31/17 06:01 PM
03/31/17 06:01 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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All that and your tooling and lathe must be rigid. An interrupted cut is always hard on tooling. And the machine.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: Turning down a crank question (machinist)
[Re: Prochargedmopar]
#2279923
03/31/17 10:18 PM
03/31/17 10:18 PM
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Joined: Oct 2007
Posts: 4,207 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,207
New York
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I don't have it handy, but the HTRAL handbook calculates headstock RPM as a function of material X cutter distance from the work. If in doubt, slow it down.
Boffin Emeritus
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Re: Turning down a crank question (machinist)
[Re: AndyF]
#2280401
04/01/17 03:43 PM
04/01/17 03:43 PM
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Joined: Jan 2003
Posts: 25,842 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,842
Rio Linda, CA
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You don't want a lot of rpm on the lathe since the crank is big and heavy but speed will depend on your cutter. Shoot for the surface speed that the cutter is happy with. How much material do you remove with each pass?
The INTERNET, the MISinformation superhighway
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Re: Turning down a crank question (machinist)
[Re: Prochargedmopar]
#2280517
04/01/17 08:12 PM
04/01/17 08:12 PM
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Joined: Jan 2017
Posts: 274 Granbury TX
Prochargedmopar
OP
enthusiast
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OP
enthusiast
Joined: Jan 2017
Posts: 274
Granbury TX
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Thank you for the replies. My personal lathe is an itty bitty Logan from the 40's or 50's. Was my grandpa's, leather belt drive. :-)
The one I'll be using is one in the maintenance shop at work and it's pretty big.
I will do search to find out what size dia. to turn it down to.
431 combo.
Unless someone can talk me into building a 440 or 451/470 instead. I have all 3 block sizes under my bench.
"Old" member Registered: Sep 2001 Lost my credentials, I'm Back!! LOL 71 Ply Satellite Procharged 73 Dodge Dart Swinger 73 Ford F-100 390/Sniper efi/back to carb 01 Town and Country Limited 08 Dodge 2500 6.7 5" Deleted 02 Mercedes C230K 19 Camry
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