Still really new to glowforge and I have been having some issues with the keyrings I am making, the circle cut out area keeps breaking!
I am using 5.5mm thick oak for the keyrings and am attaching the split ring straight to the charm.
I have left a 3 mm border around the hole cutout and this is where they are breaking, I can see tha this would be a weak point as it sticks out but can’t figure out a way to fix the issue without changing the shape of the whole design.
If any one has any advice on what I can do to stop this but ideally keep the awesome shapes that would be greatly appreciated.
One thing I learned long before Glowforge is that sharp points focus the stress. If you made those points the same radius as the hole it would not be a total solution but a big step to one. The choice of oak would be a point as well if you are going to use oak. Good white oak has a much denser structure than the more common red oak.
Your keychains have a very porus grain structure. This is going to cause a lot of potential stress fractures. I’d highly recommend either 1: switching wood or 2: if you’re set on using that wood seal with a few layers of ether CA glue, thick polyurethane, or a few layers of lacur. Any of these will fill in the voids and give some extra backing
Here is an example of one of the broken ones. I have tried using the medium and thick prograde plywoods from GF and then have been using some oak hard wood from 908 ltd and then finishing it with danish oil
The grain of hardwood is a weak spot that tends to split, so I’d change the direction of the grain so it’s running vertical. Combine that with a beefed up hole, and it might work. I still think it’s going to be prone to breaking though, and I’d suggest switching to plywood. (The sandwiched layers of plywood is much stronger.)
You can try, but the keychain hole has to withstand a lot of torque when in regular use, and I’ve never had any survive a long time on my daily keychain, even with plywood. I resorted to layering the wood with a thin layer of acrylic on the back for stability. (Or you could sandwich it between wood.) You could also try draftboard (aka MDF), and it might hold up better since there is no weak grain. But I get that it wood (pun intended ) be a very different look than you have here.