Ordering the upper and lower arms

I am FINALLY ordering the Upper and lower arms tomorrow.

The CAD (thanks to Emmanuel) for torching the arms

Originally, I was planning on torching the steel using our panograph torch from a rectangle of plate I purchased. This would save some money, but also take up a lot of time, and be far less accurate. Our torch doesn’t produce nearly as smooth cuts as the torch at Reliance Steel, and it would require me to either draw or print a big drawing of it. Plus, materials handling would be pretty difficult, as the whole piece would weigh about 1500 lb.

The salesman at Reliance Steel had originally quoted me at 1410$ one big piece, 27×66, and told me that to cut it to the size I’d need would be free. So a few weeks ago, I changed my plan to having them cut it to shape for me. I had Emmanuel start doing the CAD as a .dxf file, so they could CNC torch it for me.

When I went to order the steel last week, the salesman quoted it at 1605$ and won’t go down on the price.

Competitive metals had initially offered me a similar price (without torching it), so I called them up to see if they knew of anyone who could torch it for me. They only got one quote back, and the company wanted $1200 to torch it!

I also contacted Thunderbird waterjet, about waterjet cutting it, and they quoted me at $3500! They only charge $150 an hour of cutting, but it would take around 24hrs to cut both shapes. I guess it has to move reallllllly slow to penetrate the 3″ depth.

So, nonetheless, I will be ordering it, cut, from Reliance. This reduces time on prototype, which is already vastly behind schedule, and will increase accuracy of the cut (which is really necessary where the blades mount on the lower piece.). Plus, this is money saved in torching gas, tips, grinding wheels, etc.


Here’s the CAD file.


2 responses to “Ordering the upper and lower arms”

  1. Andrew Spina says :

    Hi– I’m building a PowerCube 4 in Baltimore (aispina.blogspot.com) and was wondering what your recommendation is for replicators of the iron worker. How should they go about producing the Arms? If accuracy is needed, and it is a hard job, what OSE tool will be capable of doing the job?

    • bkufa says :

      The CNC torch would work best. I’ve never seen it in action though, so I’m not sure how well it works. The only place where it needs to be REALLY accurate is where the lower blades attach, as that surface needs to be very smooth and flat. Especially for the angle blades.

      The rest could be cut with a regular torch, but given the thickness, it would be very difficult.

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