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| threaded inserts for holding take down archery limbs |
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| 75Plus:
John, While you are looking for better machining stainless you might look at 416. It is easiest machining of all the stainless alloys. Its not as corrosion resistant as 303 but it should be fine for your application. It is the material used in gun barrels. Joe |
| PekkaNF:
One thing comes into my mind. Looks like this part is heavily loaded static and dynamic Does this joint relies on mechanical fastening (i.e. thread outside of the insert) or glue (and the thread is primary there just increase bonding area)? Aluminium can be prepared fairly readily for bonding i.e. http://www.boatdesign.net/forums/materials/bonding-aluminum-epoxy-2629.html But stainless steel does not glue well. Because it will not etch well and therefore it does not corrode well either! Anyway to glue stainless steel you pretty much rough/grind surface and create a mechanical bond! http://www.ybw.com/forums/showthread.php?t=235725 When you read those you will notice that the procedure is essentially same, but principles and chemicals should be all different. Wether this matters on this application or not I don't know. But if things start to disintegrate this might provide a starting point for further experiments. I managed to bond aluminium pretty well for model airplanes this manner: Turned inserts, washed with hot water & detergent , etched them with Liquid Plumber, wash with hot water, immediate application with epoxy. PekkaNF |
| jcs0001:
Tony and Joe - thanks for the information about 303 and 416. They sound like good options for the purpose. PekkaNF - thanks for the info on bonding aluminium and steel with epoxy - it wasn't something I had considered. I believe the strength in this application is due to the course threads and the corresponding threads in the wood. The epoxy should help to strengthen the wood fibres and keep the insert from screwing out of the wood (although there isn't a lot of force in a counter clockwise direction on the insert). The bottom line is that I should likely do some test pieces to see how much it takes to pull an insert (or break it or the bolt). I doubt I will do this in the near future as I have so many other things to do but it would be an interesting small project. John. |
| Jonny:
They are available off the shelf but you may need to change to metric. Think they are called threadserts. Know where you get the laminate from, i have imported direct in the past inc that Royal Cammo. |
| Tony Wells:
There is an off-shelf item that lock into place. I've used them a few places without problems. http://www.newmantools.com/kee.htm |
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