Porting School #3 Budget Bench Calibration

[old blue 75]

David any idea on cost? If it is cheep enough I would buy one instead of making one.

[Lasse]

Originally Posted by DavidVizard-GFN

Everybody who wants one of these plates should post here so I can forward this to Dr.Air.
When we have about twenty he will get them made.
DV

Thank you, I'd like to get one if it is not very expensive (I don't expect so ).

[markr-nc]

Yes, I'd like one. If he has 20 or so made then they won't cost near as much as trying to do it yourself. Most of the people that would want one don't have a machine shop or know one that will do a one off anything for cheap. I sure don't.

thanks,
Mark

[Randy W.]

Hello David:
Put me on the list for one of Rogers test plate.
I enjoy your porting school series.
Regards,
Randy

[Bradz240]

Originally Posted by DavidVizard-GFN

Everybody who wants one of these plates should post here so I can forward this to Dr.Air.
When we have about twenty he will get them made.
DV

David if you could have Roger give us a estimate of the cost it would be a great help. Thanks for sharing with all us little guys.
Brad

[old blue 75]

(The amount of suction a vacuum cleaner or any electric air mover can produce is influenced by the voltage input to the motor. You must monitor the voltage at the motor input and make sure you test at the same voltage each time. For the record RH (Dr. Air) has a step up transformer that puts the line voltage up from whatever it may be (it varies between 110 and 115) to 130 volts and then a rheostat device is used to adjust it to 115 volts. )


David instead of using electricity to adjust your initial pressure drop as in your
statement above, could you use a bleed valve and create a engineered leak?
Just say you have enough vacuum to pull 120" to 125" of water(valves closed)
then you bleed it down to 110" as your start point.
This way you could always have a constant starting point.
It would be easer and less expensive than the electric version.

[MilesTugoh]

DV and Dr.Air ,
I am swayed by the allure of accurate flow nembers from a bench built for mini bucks in my humble work space.

Add my name to the list of flow plate recipients.

Thanks to each of you for sharing the knowledge.

Miles

[DavidVizard-GFN]

Originally Posted by old blue 75

(The amount of suction a vacuum cleaner or any electric air mover can produce is influenced by the voltage input to the motor. You must monitor the voltage at the motor input and make sure you test at the same voltage each time. For the record RH (Dr. Air) has a step up transformer that puts the line voltage up from whatever it may be (it varies between 110 and 115) to 130 volts and then a rheostat device is used to adjust it to 115 volts. )


David instead of using electricity to adjust your initial pressure drop as in your
statement above, could you use a bleed valve and create a engineered leak?
Just say you have enough vacuum to pull 120" to 125" of water(valves closed)
then you bleed it down to 110" as your start point.
This way you could always have a constant starting point.
It would be easer and less expensive than the electric version.

If you use a leak to fix your starting depression i think what happens here is that it throws the curve off so it's not the best way to do it. For small changes it may be OK but -----?

DV

[escortinadriver]

I'd definately be interested in one, presuming international postage is not a problem...

Loving the tech articles, keep them coming.

Shaun

[1Bad67]

I see I'm a month late, but are there any calibration plates? I would like to buy one.
Thanks,
Eric