This tool is not too scientific.....an easy manual check of a balanced operating vibrating screen or vibrating brute force feeder in this particular STROKE CARD EXAMPLE.

Customer asked me to visit his operation and troubleshoot his brute force feeder (CEDAR RAPIDS) feeding his JAW CRUSHER.

He complained it was not working smoothly.

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Reading that stroke card........Taking a stroke check on each corner while operating (4 corners) and the centre position over the drive shaft. ALL strokes should be plus/minus the SAME, measuring with a tape measure.....1/2" long in this case. If all look the same......the vibrating device (VGF) would be indicated to be running in a BALANCED state.

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THIS one was a very ERRACTIC mismatch with all the other stroke positions taken. This indicates a problem. The unit in fact was NOT BALANCED. It was wildly erratic in one corner.

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SO, we go to the unmatching stroke corner and look around to see what we can see. Here there was POOR HOUSE KEEPING, dirt, stones, limestone HARD PACKED in one corner. This was an interferance fit with the FREE FLOATING body which is on Mr. Coil spring system. The body was not vibrating equally on all 4 corners and was ERRATIC.

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SOLUTION: We had customer thoroughly clean around the vibrating body of the feeder and then the body was now free floating as designed and erratic motion was eliminated. ■