Hi! I found this project to be really exciting! Curious about the suitability of using the latest smart coffee gear on an espresso machine with a Rotary pump - any thoughts, experiences or recommendations? Contrary to a vibration pump, Rotary pumps require quite some energy to get started, and therefore might not be suitable for any pressure profiling, unless doing it steplessly, regulating rpms, or...? (It's a 10+ years Rocket Cellini Evoluzione R)
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Thanks for the response!
Hello, Its a great question and one that doesn't have a simple yes/no. As you've pointed out, switching vibration pumps on/off rapidly isn't a problem for pre-infusion or pressure profiling.
And I share your thoughts on Rotary pumps requiring more startup energy to 'get-going'. Personally I wouldn't recommend rapid switching of a Rotary pump.
If we step back from this for a moment and consider the Decent DE1PRO machine, it has amazing customizability for pre-infusion and pressure profiling. And I don't think it by coincidence that they used vibration pumps for this reason.
I'm not a huge fan of vibration pumps (although they get the job done). In a future video, I'd like to explore using a stepper motor to drive a rotary vane pump. The benefits are 2 fold, 1. Stepper motors can be rapidly switched. 2. More importantly their speed can be adjusted multiple times per second, which would be highly desirable for pressure profiling.