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| Need a big, strong, cheap, and not really that accurate load cell. |  | ||
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| Posted by: peterblais ® 06/26/2008, 05:41:54 Author Profile eMail author Edit |
Hi guys... I need to test some forged 4340 parts, and the forces are up around 60 kip in compression. This is basically for a hobby / very small business so I cannot just go out and buy a commercial load cell. I have looked at various schemes for this including bars or Z shaped members in bending but the high force is a bit of a problem there, the cross sections and such get out of control pretty quickly. I am considering just using an appropriately sized solid round bar. I would try to size it so that the strain is easily measurable with a strain gauge but the barreling is not an issue. I would place the strain gauge axially. I am not looking for super accurate, as long as it is repeatable. I need to test various designs versus each other, and test samples from batches coming in from overseas. In other words, the data needs to be comparable from one run to the next, but being dead on the money as far as the actual number itself is concerned is not the main priority. I intend to simply use a 50 ton automotive press frame as a base, and use a wheatstone bridge to an amplifier chip and finally a low pass filter into a digital DAQ. Anyone have any input on my "load cell" ? |
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| : Need a big, strong, cheap, and not really that accurate load cell. -- peterblais | Post Reply | Top of thread | Forum |
Posted by: randykimball ®  06/26/2008, 09:40:25 Author Profile eMail author Edit |
Hi, welcome...
Well, "what if" you went back to when there were no load cells.... we had to base such things on a pressure gauge at the press, reading the gauge at a pre-determined reaction, and calculating the size of the cylinder... and so on. If you need electronic recording ability there are electronic sender pressure gauges (pressure gauges with load sells in them). The worst suggestion of your lifetime may be the catalyst to the grandest idea of the century, never let suggestions go unsaid nor fail to listen to them. |
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| : : Need a big, strong, cheap, and not really that accurate load cell. -- randykimball | Post Reply | Top of thread | Forum |
| Posted by: peterblais ® 06/26/2008, 14:05:17 Author Profile eMail author Edit |
Ya, I had thought about that- in fact I was sort of planning on using the pressure gauge on the press to verify the numbers coming from the "load cell" at first. I kinda have a lot of these to do though, so eventually I would like to swap out the hand pump on the press for an electric hydraulic pump and just whack- done- |
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| : : : Need a big, strong, cheap, and not really that accurate load cell. -- peterblais | Post Reply | Top of thread | Forum |
| Posted by: Moldybread ® 08/16/2008, 12:18:19 Author Profile eMail author Edit |
What pressure hydraulics are you using? If you were to use a 10,000 PSI system, Simplex has a gauge that reads in tons, as opposed to psi. You can get the pump, gauge, and cylinder from one place. |
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