Vacuum on the Cheap - Refrigeration Compressors
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A compressor such as this will evacuate a small chamber to about the 1 Torr range. While it is theoretically possible to obtain a better vacuum with two compressors connected in series, I have only had limited success with this. Lee was able to achieve pressures to 10 mTorr with two series-connected 1950s vintage Frigidaire Meter-Miser compressors and you should feel free to experiment.
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So it looks like it is possible to build a good vacuum pump from refrigeration compressors. Just get two and not just one. The modern high efficiency ones should work even better since they have tighter tolerances for higher efficiencies.
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