Sun 5 Feb 2012
Posted by Brianna
Last week I said I’d have the complete OSE proposal and Sketchup done for the ironworker by Friday. I didn’t get it done by then, but I am prepared to start building next week. I finished the majority of the OSE Proposal, see it here. I’ll be posting my engineering calculations onto the proposal when I get them scanned in. I also generated a Bill of Materials with most of the costs listed. I’m waiting on the quotes for the steel; these should come in Monday morning. I plan on having all materials purchased by Tuesday, and begin building as soon as I get materials to work on.
I’ve updated the sketchup model to include the support frame, shown in the picture below. It’s now color coded: green means it will be 1018 steel, and red means I’ll have to surface grind it. A few small changes still need to be made for the model to completely match what I’ll be building. The frame isn’t completely updated with all its bolts and holes yet, and the stripper needs to be re-done to be a bit stronger and out of the way of the punch.
Everything shown and written here is a work in progress, so forgive any inconsistencies. Feel free to comment on any changes or errors you could have found. See my personal blog for more frequent updates.
If there are any engineers out there looking to help on a project, I could use some help analyzing the punch element for the machine. Here’s an excerpt from an email I sent explaining the issue. Contact me at brianna (at) kufadesigns (dot) com if you can help. I have a couple of weeks before I need to build these parts. If I don’t get an analysis, I’ll build it as is. If anything deforms, it will be really easy to replace because of the modularity of the design. Here’s an image to accompany the text.
“Could you help me analyze the punch on the Ironworker?
We need to insure the alignment tube won’t warp, and that the nuts welded to it will be enough to resist the pressure, and resist stripping (up to 45 kips on each bolt) while stripping the punch.
Note that the pressure (45 tons) will be distributed about the perimeter of the hole being punched, and the size of the punch will be a 1″ Diameter when the machine is under most stress.
I did shear calcs, and everything is OK except the bolt connections, which may need to be more, but I’m not sure I understand math behind these- bolts will have clamping power which will pull down with friction, so bolts won’t be entirely in shear… I’m planning on putting 3/4″-10 SHCS bolts there. (These bolts are what attach alignment tube assy to the lower arm at the back of the table).”
No related posts.