OP
machine_punk
Well-known member
Design Issues - Aero Guitar Stand
I've been designing a gift for a family member, a guitar stand, for a guy who teaches guitar for a living. I was trying to make as much of it out of 0.040" aluminum sheet as possible, since I knew it would be able to support the weight, if designed properly, it is easier to bend the thinner material, and I usually tend to be heavy-handed in my designs. I really want to start building with sheet metal, not plate or bar...and designed specifically to overcome the weaknesses of sheet metal and to allow fastening with rivets.
There are two identical parts on this guitar stand, which connect the bottom panels, to prevent them from spreading, and provide a place for mounting the rubber feet. Here, you see the old design in the front. It uses 0.040" aluminum and the stiffening flanges end before the end quite a bit before the end of the part. The set of two holes nearer the end will attach the brace to the bottom panel with rivets. The set of three holes further from the end will have an anchor nut, for attaching the rubber feet with 10-32 screws. Once I cleco'd that in place, it was evident that the weak point was where the stiffening flanges ended and all the weight of the stand was applied. That wasn't going to work. Fortunately, I now have the Baileigh 3-in-1 sheet metal machine and that makes for very quick fabrication of simple parts like this...
The new part, on the right, has the stiffening flanges going all the way to the end of the part. This is the far superior design. Since I had to make a new part anyway, and it was clear that this was a critical, load-bearing part, I went ahead and chose 0.080" aluminum for the second part. This was definitely the way to go.
I don't always get things right on the first go-around, but I do learn something new about design and fabrication with every new project. Sometimes the simpler-to-make part works better than the more-complex part.
Kev
I've been designing a gift for a family member, a guitar stand, for a guy who teaches guitar for a living. I was trying to make as much of it out of 0.040" aluminum sheet as possible, since I knew it would be able to support the weight, if designed properly, it is easier to bend the thinner material, and I usually tend to be heavy-handed in my designs. I really want to start building with sheet metal, not plate or bar...and designed specifically to overcome the weaknesses of sheet metal and to allow fastening with rivets.
There are two identical parts on this guitar stand, which connect the bottom panels, to prevent them from spreading, and provide a place for mounting the rubber feet. Here, you see the old design in the front. It uses 0.040" aluminum and the stiffening flanges end before the end quite a bit before the end of the part. The set of two holes nearer the end will attach the brace to the bottom panel with rivets. The set of three holes further from the end will have an anchor nut, for attaching the rubber feet with 10-32 screws. Once I cleco'd that in place, it was evident that the weak point was where the stiffening flanges ended and all the weight of the stand was applied. That wasn't going to work. Fortunately, I now have the Baileigh 3-in-1 sheet metal machine and that makes for very quick fabrication of simple parts like this...
The new part, on the right, has the stiffening flanges going all the way to the end of the part. This is the far superior design. Since I had to make a new part anyway, and it was clear that this was a critical, load-bearing part, I went ahead and chose 0.080" aluminum for the second part. This was definitely the way to go.
I don't always get things right on the first go-around, but I do learn something new about design and fabrication with every new project. Sometimes the simpler-to-make part works better than the more-complex part.
Kev

