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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
15th Jun, 2008 at 02:48:40pm
I want to turn down some steel bar and cut a screw thread on the end, am I right in thinking that for a 1/2" UNF thread I simply turn it down to 1/2" diameter and for 5/16" UNF thread I turn it down to 5/16" diameter?
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 1060 Posts Member #: 588 Post Whore Delaware, USA |
15th Jun, 2008 at 03:04:43pm
website:- http://www.terryhunt.co.uk
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Site Admin  15300 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
15th Jun, 2008 at 08:15:20pm
On 15th Jun, 2008 Rob H said:
screw it up Bom bom!
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 6965 Posts Member #: 507 Fastest A Series Mini in the World leeds/wakefield. |
15th Jun, 2008 at 10:32:55pm
On 15th Jun, 2008 Rob H said:
I want to turn down some steel bar and cut a screw thread on the end, am I right in thinking that for a 1/2" UNF thread I simply turn it down to 1/2" diameter and for 5/16" UNF thread I turn it down to 5/16" diameter? I realise it sounds bleeding obvious to anyone who works in a machine shop day in day out but if it's possible to screw it up I will. No Rob, for a 1/2 in bar to be screw cut you will need to turn the OD to .625 , this will give you plenty of extra dia when you fook it up ,lol. so you can try again, eventually by the time you know what your doing , it will end up at .500".lol. carl |
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 8297 Posts Member #: 408 Turbo Love Palace Fool Aylesbury |
16th Jun, 2008 at 01:01:48pm
On 15th Jun, 2008 fastcarl said:
On 15th Jun, 2008 Rob H said:
I want to turn down some steel bar and cut a screw thread on the end, am I right in thinking that for a 1/2" UNF thread I simply turn it down to 1/2" diameter and for 5/16" UNF thread I turn it down to 5/16" diameter? I realise it sounds bleeding obvious to anyone who works in a machine shop day in day out but if it's possible to screw it up I will. No Rob, for a 1/2 in bar to be screw cut you will need to turn the OD to .625 , this will give you plenty of extra dia when you fook it up ,lol. so you can try again, eventually by the time you know what your doing , it will end up at .500".lol. carl  Too true...And don't forget to wind the tool back from the job before reversing the chuck! 
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