Identifying something correctly can well clarify one's own thinking. For example, instead of "fudging" on your time card, you're defrauding your employer. Clear thinking makes us better people. This kind of thinking needs to go on inside each of our heads.
But sharing your innermost thoughts...
I think spiral grooves are sometimes used in bearings and bushings as "dirt grooves" to allow dirt particles to escape the clearance before doing too much damage.
Fair enough on the A size -- it is pretty tiny.
The GD&T Standards, if I'm not mistaken, simply require that it be to scale with a few exceptions. I've often dealt with the machining of 80-inch ball valves and 120 inch diameter pump covers. 1:1 doesn't work. Of course if I had to do that on...
My post was purposely posed as a line of questioning meant to start thinking. Please don't take it as a judgment -- it wasn't meant that way.
So you've disclosed, and you've offered.
And if it's not part of your paid duties, do it.
At least that seems to cover the ethical side. The legal...
Pumps don't a priori have rising horsepower curves from shutoff. I don't remember exactly how this goes, but my sense of it is that very high specific speed pumps (axial flow, propeller, etc.) may have horsepower curves that rise as you move from duty point to shut-off.
This may not be an...
Sorry for the late reply.
The pressure loss stands in for head which is work/unit mass, the flow is mass/unit time. Multiply them that way, and it's work/unit time - power.
You can do it with deltaP * flow * density * a "fudge" factor. That's what I did above with the 3960 constant and...
I think the question is about what's ethical, not what is expedient. Given that:
Is it possible that you're using your position to the detriment of your employer? In essence, if you use any knowledge of customers or orders to use that on the outside to enrich yourself, wouldn't you be having...
As an aside, a requirement to use only A sheets, for example, is not the source of the problem. It's splitting different 1st or 3rd quandrant projected views across sheets. You could do that on any size paper. By using datums to clarify orientation, you're using the datum callouts kind of...
I would treat it as if it is closed. Assume that on the suction side, the diameter of the suction "wear ring" (that's really not there), is where the shroud stops on the ID. Then it's a piston problem. We used to assume that the discharge pressure in the side-wall space is equal to .7 times...
The Venturi would have lower losses, because the energy loss is small. Typical discharge coefficients (C) in the .984 range. In essence, this means 97% (.984 squared)of the energy is recovered between the inlet and the throat of the venturi.
So, there's surely a little more loss in the...
I think the CF symbol is used to show the extent of an interrupted datum or geometrically controlled feature as a single entity. I've used it in an example in some drawings for a class.
So, suppose you have a shaft with a radial groove in it for an o-ring. If the shaft OD is a datum feature...
Why is the fact that it mates something else relevant?
Does that mean without it, the part has to meet tolerance but with it, the part really really really has to meat tolerance?
Wierd, if that's the explanation.
Had a co-worker a couple of decades ago. A very astute engineer and scientist whose specialty was vibration analysis. He did water-witching (dowsing) on the side.
He used bent coat hanger wires.
He maintained that it worked because the human body was a very sensitive indicator of magnetic...
Grey cast iron is very brittle -- even under temperate conditions.
For me, the rule has always been for cast iron no more than 100 psi or so pressure, ambient service, no thermal shocks.
It's like putting a glass and putting it on the stove. Heat it slowly and you might be ok. Anything goes...
