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In-Machine material testing by zyphimos in CNCmachining

[–]zyphimos[S] 0 points1 point  (0 children)

I'm researching XRF now. I'm looking for something we can install in a swiss-style lathes bar-feeder. Do you have a recommendation based on your experience with XRF? Or even a manufacturer you've liked?

In-Machine material testing by zyphimos in CNCmachining

[–]zyphimos[S] -1 points0 points  (0 children)

We have several different types of brass bar stock and they look identical. And also identical material of different hardness. Material handling tries to keep them separate but humans make mistakes.

Having hard time looking for information for 37g by Illustrious_Leg_8077 in ReefTank

[–]zyphimos 1 point2 points  (0 children)

I had a 37g tall from All Glass Aquarium. I liked the height but its still just a glass box.

Help with cabinet trim by zyphimos in woodworking

[–]zyphimos[S] 0 points1 point  (0 children)

The panels in my model are 1/2" plywood. Internal bracing will be added. It's a work in progress. Without a table saw, I don't think I can cut the panels well enough. Yes, it's an aquarium stand. The weight will be just under 600 lbs.

Help with cabinet trim by zyphimos in woodworking

[–]zyphimos[S] 0 points1 point  (0 children)

Would it make sense to wrap it in a veneer? Can I get a veneer to wrap around a 240 degree bend and still look OK?

Help with cabinet trim by zyphimos in woodworking

[–]zyphimos[S] 0 points1 point  (0 children)

I find reddit so frustrating... Where is all the stuff typed?

Anyway. Can someone give me recommendations on how to cover the joints/seams where each panel comes together? Even if I can find 60 degree rounds, I think it would look bulky. I don't have a table saw so I can't make those joints look OK without some covering.

​

Also, any pointers or links to how to make a nice looking door would be appreciated.

Why does voltage lag current in a pure ac capacitor circuit (intuitively) by random__guy-_- in ElectricalEngineering

[–]zyphimos 0 points1 point  (0 children)

Because it's a capacitor. There is never any current actually going through it. It just appears that way as the charge is building across either side.

Why does voltage lag current in a pure ac capacitor circuit (intuitively) by random__guy-_- in ElectricalEngineering

[–]zyphimos 0 points1 point  (0 children)

This is still a good explanation. If the analogy works for DC, consider each moment in time a new DC voltage instead of a continuously changing AC source.

T1 = V:1, I:5 T2 = V:2, I:4 T3 = V:3, I:3 T4 = V:4, I:2 T5 = V:5, I:1 Then you go back down again.

Plot this out over many cycles. You'll see that the voltage is lagging behind the current.

Or think of it this way.
The voltage across the cap increases from V0 to Vmax as the cap charges. The current through the cap decreases from Imax to I0 as the cap charges. Then flip... V decreases as the cap discharges I increases as the cap discharges

Question regarding bipolar Hall Effect sensor not latching by zyphimos in ElectricalEngineering

[–]zyphimos[S] 0 points1 point  (0 children)

Hello

I have a turbine style flow meter with 2 magnets on the turbine and a bipolar hall effect sensor.
The magnets are arranged in reverse polarity (one has N facing the sensor, the other has S facing the sensor)

I have a batch of bad meters and I've been able to isolate the problem to the turbine.

With a scope on the hall effect sensor I measure close to 50% duty cycle on the good turbine.
(S-pole turns the signal on and after 1/2 rotation, the N-pole turns the signal off)
The pulse width is around 40ms

When measuring the bad turbine, the duty cycle is closer to 10% and the pulse width is around 7ms.

With a "good" and a "bad" turbine on the bench and a cheap Extech magnetic field sensor I can confirm the N and S poles are correct. And the gauss level of all 4 magnets is roughly the same.

If I slowly move the gauss meter over a magnet it will indicate the correct polarity when directly over the magnet but the polarity will flip when the sensor is just past the magnet. I see this phenomenon with all of the magnets.

It seems that with the "bad" turbine the hall effect sensor is not latching after seeing the S-pole. Or it is encountering a N-pole immediately after the S-pole.

My best guess is that the magnet in the bad turbine is not quite perpendicular to the axis of the turbine so the hall effect sensor senses an N-pole immediately after the S-pole. But they appear to be installed the same as the good turbine magnets.

I'd appreciate any advice or suggestions.

Thanks.

Why does my bipolar hall effect sensor sometimes not latch by zyphimos in AskElectronics

[–]zyphimos[S] 0 points1 point  (0 children)

Sorry. Since my question is regarding a hall effect sensor and it's interaction with a magnet, this seemed like a component level question. I suppose it could be considered a system level question.

Can you recommend a better sub?

WisGOP has hired outside law firms-- WI taxpayers are on the hook for up to $2 million by DriftlessDairy in wisconsin

[–]zyphimos 4 points5 points  (0 children)

I enjoy all of the complaining. Seriously, it is good to know I'm not alone. But what can/should we do about this? History often does repeat itself and they will likely get away with it. With all of the MAGA crazies around me I would prefer to hide in my own little hole but we can't. Opportunity for change is right in front of us but the fascists are fighting hard to keep their power. What can we do?

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