This machinist says: "Why would you want to *do* that?
Strictly speaking, cut threads - what you get from conventional taps - are weaker than swaged threads, such as the rolled threads one usually finds on AN class fastener. So ... if one wants threads in alumin(i)um, one needs a tool that displaces the metal, rather than cutting it. Eureka! Such a tool does exist - the "fluteless thread forming tap" E.g.: http://www.shoprutlandtool.com/webapp/wcs/stores/servlet/ProductDisplay;jsessionid=0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=27670&langId=-1&storeId=10001&catalogId=10001&parent_category_rn= <http://www.shoprutlandtool.com/webapp/wcs/stores/servlet/ProductDisplay;jsessionid=0000aUcDvp-FmIJrmRkZmUaWieP:-1?productId=27670&langId=-1&storeId=10001&catalogId=10001&parent_category_rn=> Rutland Tool # 21238428 Good hunting, Dale R. COZY MkIV #1254 Ernest Christley wrote: Ed Anderson wrote: Scott, I think the best answer is to simply tap those bolt holes for the thread size of your bolts. This does a number of things. I've been told by a machinist that tapped holes in aluminum are weak. Any truth to that? -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
Ed Anderson wrote: Scott, I think the best answer is to simply tap those bolt holes for the thread size of your bolts. This does a number of things. I've been told by a machinist that tapped holes in aluminum are weak. Any truth to that? -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
Scott, I think the best answer is to simply tap those bolt holes for the thread size of your bolts. This does a number of things.