DohNut Posted February 12, 2007 Share Posted February 12, 2007 Drilling and Tapping I have an M3 bolt and an M3 tap I think the pitch matches What diameter hole should I drill 🤔 I guess it must be Just less than the "thinnest" bit of the thread , but does an M3 bolt have a 3mm shaft that the threads stick out from or if the outermost part of the thread 3mm? So should the hole be 3mm 🤔 2.5mm 🤔 2mm ❗ Nick Link to comment Share on other sites More sharing options...
DohNut Posted February 12, 2007 Author Share Posted February 12, 2007 PS Is anyone good with sketchup? I want to rotate a section about an axis to create a solid - like an eggcup shape Nick Link to comment Share on other sites More sharing options...
elie boone Posted February 12, 2007 Share Posted February 12, 2007 A general rule = Bolt dia. minus the pitch = drill dia. Link to comment Share on other sites More sharing options...
Tony C Posted February 12, 2007 Share Posted February 12, 2007 Have a look here for tapping an M3 female thread. An M3 bolt has a nominal (outside) diameter of 3mm. BRG Brooklands SV 😬 It seems that perfection is achieved not when there is nothing more to add, but when there is nothing more to take away. (Antoine de Saint-Exupery) Link to comment Share on other sites More sharing options...
David Brown Posted February 12, 2007 Share Posted February 12, 2007 Unless it's a thread rolling tap. David Link to comment Share on other sites More sharing options...
Beelzebub Posted February 12, 2007 Share Posted February 12, 2007 From my Zeus Precision book. For an an M3 tap the tapping drill is 2.5 mm. In old money it's 3/32 D. Link to comment Share on other sites More sharing options...
Foxy Smith Posted February 12, 2007 Share Posted February 12, 2007 Re sketchup, you can create solids round an axis, I think you use the "follow me" control. It's described in the first tutorial. Re tapping drill , size depends on material used, class of fit required and most important of all, what drills you have. Generally 2.5mill will be fine and dandy. Link to comment Share on other sites More sharing options...
Sheds Moderator Posted February 12, 2007 Share Posted February 12, 2007 Not too critical with M3 because (a) the amount of material removed and (b) the likely loading is so small that a bit either side won't matter. There are tables on t'internet that will give you the precise figures, whether you then *own* a 7.3mm drill for your M8 tap is questionable. It's at this point that the rest of us start measuring the imperial drills with a mike to get something "close enough". 😬 Link to comment Share on other sites More sharing options...
DohNut Posted February 12, 2007 Author Share Posted February 12, 2007 Cheers all Will try to find a sharp drill around 2.5mm metric or otherwise. Thx Foxy will have another go at the first tutorial Nick Link to comment Share on other sites More sharing options...
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