# Search:

Type: Posts; User: daleacyr

1. ## Thread: help to estimate the pulling force in this pulley-cable arrangement

by daleacyr
Replies
2
Views
1,910

### That picture looks like it came from Delbert...

That picture looks like it came from Delbert Hall's book on rigging...
He provides the answers to the homework questions in the back of the book.
2. ## Thread: What is the equation for....

by daleacyr
Replies
3
Views
627

### Thanks for that. I used both equations, and got...

Thanks for that.
I used both equations, and got the same answer. (That's good!)
But I seem to be having a bit of a 'senior moment'... indulge me if you will.
The Maximum Tensile Stress is xxx...
3. ## Thread: What is the equation for....

by daleacyr
Replies
3
Views
627

### What is the equation for....

I'm back with another crazy, shop built project. :)

Think of a HF hydraulic press.

The columns have to resist a tension load.
I'm building something similar, a device to proof test electric...
4. ## Thread: How a propeller blade is resisted by various viscosity?

by daleacyr
Replies
7
Views
886

### Yes, that will at least help me understand the...

Yes, that will at least help me understand the discussion. :)
5. ## Thread: How a propeller blade is resisted by various viscosity?

by daleacyr
Replies
7
Views
886

### The most important effect is that the substance...

The most important effect is that the substance be thoroughly mixed.
The "substance" is unknown at this point, hence the question.

I'm basically pondering how strong a propeller (impeller?) blade...
6. ## Thread: How a propeller blade is resisted by various viscosity?

by daleacyr
Replies
7
Views
886

### How a propeller blade is resisted by various viscosity?

I'm building propeller blades to blend various solutions.
But I'm stuck: is there a formula to determine the resistance a specific viscosity will provide against a surface area?

Meaning, if...
7. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Here is a picture of the completed project. I...

Here is a picture of the completed project.

It turned out pretty well; the customer wants several...
8. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### We built a table, and then performed a real world...

We built a table, and then performed a real world deflection measurement.
I was getting less and less comfortable with the potential deflection, so we up-sized the beams to .120.

We got an actual...
9. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Ok, thanks. Simple beam calculations I...

Ok, thanks.
Simple beam calculations I understand very well.
Structures.... less so.

We are still going to build one and let two "big dogs" sit on it.
10. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### If you will indulge me just a bit further......

If you will indulge me just a bit further...
I've been thinking about the fact that the center support is really just adding a third bending member.

To calculate how much that third member adds...
11. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Good point. That's why I ask for input. :)

Good point.
That's why I ask for input. :)
12. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Well, we got approval (for aesthetics) regarding...

Well, we got approval (for aesthetics) regarding the center support.
With a 500 lb load at center, this reduces deflection to less than a tenth of an inch, providing my calculations are correct.
...
13. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Thanks for the input. I've run the various...

Thanks for the input.
I've run the various numbers; a center support fixes a lot of problems.
I'll check with the committee for approval.
14. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Thanks! I had not thought of the assembly in that...

Thanks! I had not thought of the assembly in that way.
Now for a bit more number crunching...
15. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Thank you for your responses. I wish I could...

I wish I could develop a stress / strain curve for the complete assembly, but the only way that I know how to do that would be to actually stress the assembly and...
16. ## Thread: Reasonable deflection for a metal and wood table

by daleacyr
Replies
20
Views
3,504

### Reasonable deflection for a metal and wood table

I've been tasked with building a couple of tables for a church.
The "customer" is requesting that the tables be made from 3" high x 1.5" wide by 14 ga. tube steel, with a wood plank top....
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