- Joined
- Dec 18, 2010
- Messages
- 530
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TRF,
May I share my split / collapsible mandrel concept for your comment?
Referring to the picture below:
1. Mandrel is cut lengthwise to 1/4-inch slot
2. Angle stock (black) is glued to slot edges inside tube (brown)
3. U-channel (green) captures angle stock (black)
4. HDPE strip (white) fills gap for solid vacuum tight seal.
After lay-up the HDPE and u-channel are pulled to yield a collapsible mandrel. Hopefully the tube will release even though it had been vacuum bagged to the mandrel.
Feckless
My main concern is: Is it actually going to be vacuum proof? I guess you can plug the gaps with vacuum tape...
Has anyone experience with countersunk blind rivets? Perhaps I can reinforce my split mandrel from delamination by placing a few along the length of angle stock and inside the winding area? Grind to flat if necessary. Touch up with thickened epoxy.
Recall the mandrel is a single layer of 16oz cloth over sonotube.
I wanted to share an assembly photograph but that would require the assistance of a few sober friends. As few of my friends are sober there may be a wait for those still interested.
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