# Search:

Type: Posts; User: Hudson

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1. ## Thread: Help with design of rack

by Hudson
Replies
1
Views
65

### Sounds dangerous but, first determine if the...

Sounds dangerous but, first determine if the floor can handle the load. If you have two 1 foot wide, seven foot long supports at the base and 21,000 lbs supported by them that's 1500 lbs/sq.ft if...
2. ## Thread: Mounting a planar mirror with epoxy

by Hudson
Replies
2
Views
323

### Consider a urethane adhesive for windshields. ...

Consider a urethane adhesive for windshields.

3. ## Thread: how do they do it ?

by Hudson
Replies
2
Views
756

### Are they multi-million dollar dies? Years ago,...

Are they multi-million dollar dies? Years ago, when the earth was thought to be cooling, auto makers used a free machining, low melting alloy called Kirksite for fender dies.

More recently,...
4. ## Thread: How to Interpret Geometric Tolerance and Dimensional Tolerance

by Hudson
Replies
4
Views
1,642

### You have a .002 cylindricity and a roundness call...

You have a .002 cylindricity and a roundness call out. That seems like double dimensioning to me.

Could you just call out a .005 cylindricity and a surface finish on the basic shaft diameter and...
5. ## Thread: How much does the flow of a pipe get reduced if undersized couplings are used?

by Hudson
Replies
2
Views
688

### Look harder for 1" couplings. They should be...

Look harder for 1" couplings. They should be less than a dollar for the PVC type.
6. ## Thread: how to calculate the steel weight?

by Hudson
Replies
4
Views
1,932

### .283 lbs/cubic inch

.283 lbs/cubic inch

by Hudson
Replies
1
Views
513

### If you know the distance from one pivot to...

If you know the distance from one pivot to another on the links, it is a simple triangle problem:

With angle theta and the distance from the two base pivot points and the length of the link...
8. ## Thread: backup power for old sailboat

by Hudson
Replies
6
Views
780

### Take another look at the Parker catalog (fine...

Take another look at the Parker catalog (fine folks they are) and see if you haven’t misread the volume as gallons when the actual figure is in liters (57).

57L is more like 15 gallons or 2...
9. ## Thread: How to manufacture this spiral part?

by Hudson
Replies
2
Views
405

### Much simpler to mold is a vortex spiral.

Much simpler to mold is a vortex spiral.
10. ## Thread: backup power for old sailboat

by Hudson
Replies
6
Views
780

### Regarding hydraulics, you cannot compress a...

Regarding hydraulics, you cannot compress a liquid so your accumulator piston must work against some sort of spring like compressed air or steel. So the real energy storage is in the spring.

...

by Hudson
Replies
10
Views
815

12. ## Thread: Torque requirement calculation

by Hudson
Replies
3
Views
783

### You might look at a stepper motor and ball screw...

You might look at a stepper motor and ball screw configuration that would be positioned under the table to provide linear force.

Look for a 400 mm travel length linear stepper motor on Amazon. ...
13. ## Thread: Torque requirement calculation

by Hudson
Replies
3
Views
783

### Most mechanism to accomplish this motion will...

Most mechanism to accomplish this motion will require a gear reduction. Since we don't know the motor speed, friction etc. it is not possible to give you a direct answer.

You want to move 300...
14. ## Thread: Help needed to design a bed on a winch/pulley system!

by Hudson
Replies
5
Views
911

### Look at some existing designs for folding or...

Look at some existing designs for folding or Pullman berths. Some are ceiling mount - some are wall mount. Also consider getting double duty out of another piece of furniture like a table or a...
15. ## Thread: Tubing size for cantilevered aluminum beam

by Hudson
Replies
5
Views
595

### If you recall, the deflection equation used a...

If you recall, the deflection equation used a length cubed term. The difference between 42 cubed and 36 cubed is considerable.

We are now looking for a tube with a section moment of...
16. ## Thread: Tubing size for cantilevered aluminum beam

by Hudson
Replies
5
Views
595

### Increasing the allowable deflection by 2X reduces...

Increasing the allowable deflection by 2X reduces the moment of inertia required by ½.

A 3” square tube with an 1/8” wall has a section moment of inertia of approximately 1.98 inches^4. A...
17. ## Thread: Tubing size for cantilevered aluminum beam

by Hudson
Replies
5
Views
595

### We don’t know quite enough to design a davit for...

We don’t know quite enough to design a davit for you.

What we can guess is that that 200 lbf end load can get a lot higher under sea if the dinghy fills with storm water and starts to...
18. ## Thread: Help with Proper Torque Spec

by Hudson
Replies
6
Views
937

### 117 N/mm2 is a stress level equivalent to 117 MPa...

117 N/mm2 is a stress level equivalent to 117 MPa or approximately 17,000 psi.

This rather low stress for a bolt. This might be based on the unusual thermal requirements of a fireproof...
19. ## Thread: Cutting 1060 plate

by Hudson
Replies
6
Views
1,223

### Are you attaching this gusset by welding?

Are you attaching this gusset by welding?

by Hudson
Replies
8
Views
645

21. ## Thread: Self locking aluminum extruded U channels

by Hudson
Replies
7
Views
441

### Why not use rectangular tubing?

Why not use rectangular tubing?
22. ## Thread: Can anyone help me identify which material is better?

by Hudson
Replies
4
Views
412

### Also think about heat treating. Most steel gears...

Also think about heat treating. Most steel gears are carburized.
23. ## Thread: Hydraulic Total Cost of Ownership

by Hudson
Replies
2
Views
633

### Ask the sales force of the high priced hydraulic...

Ask the sales force of the high priced hydraulic fluid to justify the cost. If they don't have good numbers, move on to your next project.
24. ## Thread: Controlling low air pressure

by Hudson
Replies
2
Views
452

### You might use two valves in series. The first...

You might use two valves in series. The first would open a 2psi and the second close at 3.5 psi. You could also combine an electrical with a mechanical valve to handle separate conditions.
25. ## Thread: Deck Joist Bending Calculations

by Hudson
Replies
3
Views
434

### I attach a segment from "Building Construction...

I attach a segment from "Building Construction Illustrated" by Francis D. K. Ching (A favorite of mine on the subject) which suggests that cantilevers of 24" or less might not need engineering...
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