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Hi Brimstoner, would you elaborate a little more? Why do you say that by making the bushing weldable we will lose the case characteristics. Are you suggesting the case will be tempered out by the weld heat? Thanks.

At worst case, we are probably welding within 1/2" of the carbon-rich (hardened) areas. The spec for the part is to temper the case to 55-60 Rc. I can probably live with 50-55 and wonder if the higher temper and lower hardness of the case would reduce the probability for cracking. I will attach...

Thanks for your insight but we did mask the surfaces to be welded during carburizing using stop-off. Therefore they should have the carbon content of 8620. I can also add that we are using 71A85 ultrcore wire.

We have are welding an 8620 bushing (masked on all surfaces except bore during carburizing) into an A36 plate. The bushing is about 7.5" OD with a 1.25" wall and we are applying a fillet weld on the OD corner. That is, we are applying weld heat about 1" to 1.25" from the carburized surface. The...

Drill strings can be used on all sorts of drilling tools which can impart different types of loads on the tool joints. Percussion drilling (DHD) is low torque and generally a string for a deep hole (greater than 300 feet) is in tension due to lower WOB needs. However, there can be considerable...

Hi tbuelna, Thanks. That report was exactly what I was serching for. I'll need to have a deeper look in that site as needed. Israelkk, looks like our plot was fouled!

Thanks to all. A special thanks to israelkk! I purchased the book by Arthur Burr and will start the design process once available. Should be an exciting application.

Hi Don, Sorry about the confusion. The link I attached was not intended to show how I will use the clutch but just an example of a wrap spring application. The clutch will be used in an overrunning application. With that said, can you direct me to design resources for wrap spring clutches?

Thanks for your interest. I am referring to an overrunning clutch commonly known as a spring or wrap spring clutch. They are in the same class of friction clutches with roller or sprag types.http://machinedesign.com/ContentItem/69416/Gettinguptospeedwithwrapspringclutchbrakes.aspx

Can anyone direct me toward, or eamil, resources that deal with the design of wrap spring clutches? I designed one about 15 years ago and have misplaced all my reference materials. Thanks.