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Message No. 17790, Started by john2005 on 07/02/06
 Request for advice regarding manufacture of a spring anchor (with attached jpg image) Hi everyone, I have uploaded a small 19KB .GIF file to rapidshare showing a drawing of a simple adjustable spring anchor I am making from a 10-32 screw. Here is the download link... http://rapidshare.de/files/24739574/Spring_Adjustment_Screw.gif.html Regarding the drawing, an extension spring hook goes through the .098" hole, and the other end of the screw gets a hex nut that can be no larger than 5/16" flat to flat, such as part # 90760A411 from www.mcmaster.com. Due to space limitations, the hex nut must be adjusted with a box end wrench.   The .359" to .390" OD spring ( similar to the #80583 www.centuryspring.com) uses .08" diameter wire, but the problem I ran into is that the hole is not really large enough for the spring, due to the curvature of the hook. Can a machinist cost effectively just make a .098" wide slot in the screw, about .145" to .155" long, instead of a .098" hole? I know slots are generally easy to do, but since it is so small, I wanted to get some feedback. If the slot can be made cost effectively, It will work well with the spring. If the slot cannot be made cost effectively, then I must use a larger screw that will allow for a hole of about .145" OD. A 1/4-20 or 1/4-28 screw would work great, but I could not find a nut that is 5/16" flat to flat max, and that has a 1/4-20 or 1/4-28 thread. I did find a 1/4-32 nut (part # 91862A516) from www.mcmaster.com, which is only 5/16" flat to flat, but then I can't seem to find a screw for it. Mcmaster also sells a 1/4-40 nut that would work, but same problem, I cannot find a screw. I would appreciate any feedback anyone can provide. Hopefully, just creating a slot in the 10-32 screw is viable and cost effective. Thanks for your help. John
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Follow-up Messages (13)
 Hi everyone, Well, I guess there should be no problem making the flat, I... No. 17818, Posted by john2005 on 07/09/06, 10:32 PST. Hi Gerdb, Thanks for your message. I like the extra strength of the h... No. 17816, Posted by john2005 on 07/08/06, 10:23 PST. I personally like capscrews over stainless.  The fact that the cap scr... No. 17814, Posted by gerdb on 07/07/06, 19:31 PST. Hi Gerdb, I found a Part # 92196A281 from www.mcmaster.com that is made ... No. 17813, Posted by john2005 on 07/07/06, 15:10 PST. Hi everyone, I found a part # 92196A279 from www.mcmaster.com made from ... No. 17809, Posted by john2005 on 07/06/06, 21:37 PST. erased No. 17808, Posted by devitg on 07/06/06, 17:28 PST. Hi Gerdb, Thanks for the additional info. I found a Part # 91251A353 ... No. 17806, Posted by john2005 on 07/06/06, 13:18 PST. " It looked to me like doing it either way would be strong enough, but... No. 17802, Posted by gerdb on 07/04/06, 21:14 PST. Hi Gerdb, Thanks for the additional feedback, >Gerdb wrote: >however... No. 17801, Posted by john2005 on 07/04/06, 19:43 PST. "Can a machinist cost effectively just make a .098" wide slot in ... No. 17799, Posted by gerdb on 07/04/06, 06:24 PST. Hi Gerdb, Thanks for your comments they were helpful. For prototypes, I ... No. 17797, Posted by john2005 on 07/03/06, 09:57 PST. there is no problem making any of it any way at all, provided you have a pr... No. 17792, Posted by gerdb on 07/02/06, 19:32 PST. Hi everyone, Someone from another forum just pointed out that it may be ... No. 17791, Posted by john2005 on 07/02/06, 11:14 PST.