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+--- Thread: Home made IP bench machine. (/showthread.php?tid=2052)
Home made IP bench machine. - winmutt - 12-10-2010
http://www.peachparts.com/shopforum/showpost.php?p=2605656&postcount=15
Check out that. Its not very usuable but it DOES present some interesting ideas. Doesn't seem like a 5 or 10hp stepper motor is required. I've asked the local hacker/maker list for ideas on measuring quantity.
RE: Home made IP bench machine. - Alastair E - 12-10-2010
Measuring is easy.
Calibrated pipettes of the appropriate sizes.--Cheap and easy off fleagay.
But you'll need the special calibrated test-injectors, nozzle of which I believe is DN12SD12 set at EXACTLY 100 bar, plus the coalesser heads.
Measuring and arranging the output of the injectors to correspond to 1000 strokes would be doable, but variable speed maybe more of a challenge, if you plan proper governor adjustments.
A Proper test-bench has CVT like belt arrangements down inside its guts....
RE: Home made IP bench machine. - winmutt - 12-10-2010
(12-10-2010, 04:34 PM)Alastair E Calibrated pipettes of the appropriate sizes.--Cheap and easy off fleagay.How would calibrated pipettes work at speed?
RE: Home made IP bench machine. - Alastair E - 12-10-2010
(12-10-2010, 05:06 PM)winmutt(12-10-2010, 04:34 PM)Alastair E Calibrated pipettes of the appropriate sizes.--Cheap and easy off fleagay.How would calibrated pipettes work at speed?
???--At Speed...?
The pump isnt on the car!
Or even an engine.....
Its driven on a test-bench, at a certain speed and throttle-setting depending on what you want to set up. The test speeds/quantities are found in the specific ISO Test-Plan for that serial pump
Its output is fed to the test-injectors and coalessers, whose output is allowed to fill the pipetts....
--There are normally two sets of pipetts. One small volume (For idle checks) and one larger volume (For full load).
One for each cylinder is used at any one time!
Arrangement to allow filling/emptying of the pipetts and an arrangement to accurately determine the number of turns the pump makes linked in to the pipette filling arrangement.
After 1000 strokes, flow from test-injectors diverted away from pipettes.
Measurement of fuel taken and any alterations done and another run taken to determine if the desired quantity is found, and that balance is achieved....
This is approximately how a Proper test-bench works....
RE: Home made IP bench machine. - 300D50 - 12-11-2010
I think Alastair means either buretes or graduated cylinders, not pipettes.
So theoretically, one could do this at home if a suitable apparatus was devised to meet the following requirements:
Turn the pump smoothly at a given RPM
Count revolutions at that rpm
Stop automatically after a certain number of revolutions (1000 in this case)
I think I could rig something like that up, using a geared motor + h bridge, a quadrature encoder for speed and position, and an MCU running the show.
Tap in "300R1000X", and it ramps to 300RPM, then waits for a button press to start counting revs.
I hate this, now I want to build it...
RE: Home made IP bench machine. - winmutt - 12-11-2010
(12-10-2010, 09:37 PM)Alastair E ???--At Speed...?
The pump isnt on the car!
Or even an engine.....
Its driven on a test-bench, at a certain speed and throttle-setting depending on what you want to set up. The test speeds/quantities are found in the specific ISO Test-Plan for that serial pump
Yes at speed. But I see now, the rpms are specific not ranges. That makes a bit of sense but is also not a very good measurement IMO. It takes how many revolutions before the pump is at the setting where it should be? What you describe could EASILY be reproduced.