Posted by: peter scott ® 04/23/2007, 16:18:34 Author Profile eMail author Edit

am struggling to understand the practical aspect of calcualting thread lengths I know there are provided for us formulas for us to work with,but I am strggeling to apply them to my requirement for example I am designing a hydraulic cylinder which has a "head bush" the outside diameter of the head bush is 122mm, and I would go for a 2mm pitch the gland is screwed into the hydraulic tube when assembled the piston comes against the head bush and applies a force how do I calculate what yeild load I can get from a given length of thread e.g. 65mm thanks Peter Scott

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Re: threads
Re: threads -- peter scott	Post Reply	Top of thread	Forum

Posted by: materialboy ® 04/23/2007, 17:00:55 Author Profile eMail author Edit

Sorry Peter- this might sound irrelevant, whern I try to search on 'Head Bush' - it comes with Bush head on google. I needed to understand 'Head Bush' before giving any strong suggestion. Anyways, as jboggs suggested if you need formula's to calucalte you can really look into 'Machinery Book' - a real good refrence. But if you are just after the 'Yield Load' than you ca always find it from the material chart under the name of yield stress. Yield Load - determine the yield at whivch material goes into plastic stage. You need to know at what temp and pressure you are loading head bush for hydraulic cylinder. Hope it helps but I am not really sure on how you using hydraulic cylinder to design Head Bush.

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Re: threads
Re: threads -- peter scott	Post Reply	Top of thread	Forum

Posted by: jboggs ® 04/23/2007, 16:30:51 Author Profile eMail author Edit

Have you checked Machinery's Handbook? It has a good discussion of thread strength.

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