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60 acre hillside Long Time User
Joined: 27 May 2010 Posts: 633
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Posted: Wed Jan 02, 2013 5:23 pm Post subject: Machining Grade 8 Bolt |
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I needed some pointed set screws. The store did not have them. I have a 6" Jet lathe and am considering making them from grade 8 cap screws. I have limited experience with carbide tools but get along pretty well shapening HS tool bits. Is grade 8 too hard to turn? |
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Dal in MO New User
Joined: 02 Nov 2007 Posts: 12 Location: NE MO
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Posted: Wed Jan 02, 2013 5:39 pm Post subject: Re: Machining Grade 8 Bolt |
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Grade 8 bolts are fairly soft, about 20 - 25 RC hardness and can be turned very eazly with HSS tool bits, grind your tool bit with about a 7 degree relief angle and a 3 - 5 degree positive rake angle on the top of tool,and run about 300 - 500 RPM, with a small cut on your Jet lathe. |
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Ultradog MN Tractor Guru
Joined: 22 Apr 2001 Posts: 12440 Location: Twin Cities
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Posted: Wed Jan 02, 2013 6:03 pm Post subject: Re: Machining Grade 8 Bolt |
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I agree.
They will cut easily with HSS. |
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Eric in IL Long Time User
Joined: 02 Dec 2005 Posts: 783
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Posted: Wed Jan 02, 2013 6:11 pm Post subject: Re: Machining Grade 8 Bolt |
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If you are ever in doubt about being able to cut something with HSS, try filing it first. If you can cut it with a file, you can cut it with HSS. |
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Bernie/MA Guest
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Posted: Wed Jan 02, 2013 6:20 pm Post subject: Re: Machining Grade 8 Bolt |
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I have a hand-held bandsaw. A friend was using it to cut bolts, brought it to me because it stopped cutting. I don't know how many he cut but I looked at the heads and they were grade 8s. There were no teeth left on the good bi-metal blade. |
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BOBM25 Long Time User
Joined: 19 Apr 2006 Posts: 567
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Posted: Wed Jan 02, 2013 6:58 pm Post subject: Re: Machining Grade 8 Bolt |
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HSS will cut alot more stuff than most people give it credit. You just have to take it slow. Most people get in a hurry and that is what smokes their tooling |
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60 acre hillside Long Time User
Joined: 27 May 2010 Posts: 633
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Posted: Thu Jan 03, 2013 1:35 am Post subject: Re: Machining Grade 8 Bolt |
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Thanks to all of you. I plan to make them this morning |
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cannonball Regular
Joined: 05 Mar 2009 Posts: 448
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Posted: Thu Jan 03, 2013 5:44 am Post subject: Re: Machining Grade 8 Bolt |
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put them in a drill and bench grind them to what point you want.. |
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