Request for advice regarding manufacture of a spring anchor

John2005 · 2006-07-02T15:49:56+00:00

Hi everyone,I have uploaded a small 19KB .GIF file to rapidshare showing a drawingof a simple adjustable spring anchor I am making from a 10-32 screw.Here is the download link... 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 nolarger than 5/16" flat to flat, such as part # 90760A411 from Due to space limitations, the hex nut must beadjusted with a box end wrench.The .359" to .390" OD spring ( similar to the #80583 uses .08" diameter wire, but the problem I raninto is that the hole is not really large enough for the spring, due tothe curvature of the hook.Can a machinist cost effectively just make a .098" wide slot in thescrew, about .145" to .155" long, instead of a .098" OD hole?I know slots are generally easy to do, but since it is so small, Iwanted 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 largerscrew that will allow for a hole of about .145" OD. A 1/4-20 or 1/4-28screw would work great, but I could not find a nut that is 5/16" flatto 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 whichis only 5/16" flat to flat, but then I can't seem to find a screw forit. 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, justcreating a slot in the 10-32 screw is viable and cost effective.Thanks for your help.John

Jul 02, 2006 22 Replies

Rate this thread:

Winston 20 years ago

One possibility: Heat say 3/8" of the end of the screw to a nice bright cherry red and flatten it with a hammer against your anvil. Centerpunch and drill the flattened area. Simple, no?

--Winston

Vote

John2005 20 years ago

Hi everyone,

I found a part # 92196A279 from

formatting link

made from 18-8 stainless that should machine fine, but then on the 2D drawing it says the thread length can vary from 7/8" to fully threaded. I don't know if they mean the thread length can vary that much on that particular part, or from part to part.

Winston's advice is good, but I would rather just find a softer screw that will work if I can.

Thanks aga> John2005 wrote:

Vote

John2005 20 years ago

Hi everyone,

I found a Part # 92196A281 from

formatting link

that is made from 18-8 stainless & should work for me. It has a length of 2.5" and the threaded portion can vary anywhere from 7/8" to 2". That will leave me enough room to cut the screw to length, and then use a 1/4" long portion of the non-threaded portion to drill the .098" hole through.

It kills me that the tell you the screw is partially threaded, then the drawing says the thread can vary from 7/8" to fully threaded or 7/8" to

2" thread. That's a big variance if you are working with or in need of the un-threaded portion. I wonder why they are so inconsistent with regards to thread length ?

Anyway, it looks like I have something that will work now.

Thanks again for the feedback guys.

John

John2005 wrote:

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required