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Title: Thread Sizes Post by: Fast_Eddie on March 28, 2004, 11:22:57 AM Hello,
I'm about to purchase some taps and dies to clean up some bolts, etc, and retap some captive nuts in the FC. Am I correct in assuming that the early Holdens are UNC & UNF thread? Regards Edward Title: Re: Thread Sizes Post by: Effie C on March 28, 2004, 11:42:50 AM Thats correct Edward, UNC & UNF, would suggest some die nuts too if you can afford them.
John M Title: Re: Thread Sizes Post by: Fast_Eddie on March 30, 2004, 08:17:01 PM John,
I purchased taps and dies, and cleaned up a few nuts and bolts. Now the nuts spin onto the bolts! Simple pleasures.... Seeing it was 20 years ago that I completed year 8 metalwork, I'm a little bit rusty on some of the tecnique with tapping new holes. What's the relationship between the hole diametre, and the tap that is required to tap it. ie, Do I bore a 5/16 hole for a 5/16 tap, or should it be a 1/4 or 9/32? No doubt there is a published table that identifies this? Any advice would be appreciated. Regards Edward Title: Re: Thread Sizes Post by: craiga on March 30, 2004, 08:29:07 PM Edward,
I did a quick search and came up with a figure 55 -75% of the major diameter as depicted in the image below. (http://www.parktool.com/images/repair_help/thread.gif) You could also have a look here http://www.cartech.com/machining_zone/tapping.html which has enough info to keep you amused for hours on end. ;D Even has formulas!!! WOOHHHOOO ;D (http://www.cartech.com/machining_zone/images/tapping_formulas.gif) Cheers, Craig. Title: Re: Thread Sizes Post by: Murray on March 31, 2004, 08:42:13 AM P&N (cutting tool makers) put out a really good chart that covers a wide variety of threads but I am not too sure where you could get one. Perhaps Blackwoods or one of the other engineering supliers.
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