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Type: Posts; User: Hudson

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1. ## Thread: Bolt tension on a cantilever beam?

by Hudson
Replies
7
Views
299

### You need help with the equations? Moment...

You need help with the equations?

Moment from arm = 100 kg x 650 mm = 65000 kg mm

(22.5 mm x Force on bottom bolts) + (152.5 mm x Force on top bolts) = 65000 kg mm in the opposite...
2. ## Thread: Bolt tension on a cantilever beam?

by Hudson
Replies
7
Views
299

### A ball park method: You have a moment on the...

A ball park method:

You have a moment on the beam that is transferred to the plate. Presumably you know the distance from the bolt holes to the bottom edge of the plate.

I would calculate...
3. ## Thread: Help with Centrifugal Force

by Hudson
Replies
6
Views
254

### You have not presented a clear picture of the...

You have not presented a clear picture of the problem or exactly how your equation came to be. We went from casting a cylinder to a rectangular tube of unknown dimensions and we added a speed but...
4. ## Thread: Help with Centrifugal Force

by Hudson
Replies
6
Views
254

### To convert rpm to radians per second, multiply by...

To convert rpm to radians per second, multiply by .10472
The obtain centrifugal force you need to square the rotating speed so to convert to rpm^2 use .10472^2 or .010966
You also need to convert...
5. ## Thread: Could electrolysis be an energy storage medium for our next energy future

by Hudson
Replies
3
Views
247

### Water molecules are very polarized and are pulled...

Water molecules are very polarized and are pulled apart by the opposite charges in the equipment you illustrate. It is a DC current not a frequency phenomenon.

You can store energy in this...
6. ## Thread: Drive line Calculations

by Hudson
Replies
1
Views
260

### Are you referring to the bending owing to...

Are you referring to the bending owing to gravitational force? If so, is the shaft uniform in dimensions so that you can treat it like a uniformly loaded beam? Then you probably want the shaft...
7. ## Thread: Bearing Arrangement

by Hudson
Replies
1
Views
206

### One method is to use a press fit and/or a...

One method is to use a press fit and/or a retaining ring on the shaft in the fixed location and have a slip or sliding fit on the floating end. In both cases the outer race is fixed.
8. ## Thread: Fundamentals of Design Engineering?

by Hudson
Replies
4
Views
490

### My review suggests the original post was...

My review suggests the original post was manufactured by rolling - in self-pity. The material is probably snowflake.

It is entirely possible that the interviewer was trying to be helpful...
9. ## Thread: Trying to join PVC parts together

by Hudson
Replies
2
Views
235

### Check out sonic welding. There is also some...

Check out sonic welding.

There is also some pretty good glue in the plumbing aisle.
10. ## Thread: Identifying a force

by Hudson
Replies
6
Views
282

### force on pins

The projecting pins will be pushed outward or inward by the mating holes.

This force exerts a bending moment on the pins attempting to rotate them.

The force also tries to move the pins away...
11. ## Thread: No. of Holes

by Hudson
Replies
5
Views
488

### Multiply the pressure times the area inside the...

Multiply the pressure times the area inside the gasket to get the force trying to push the cover off the valve. The total clamp load of the bolts should be several times this value. How many times...
12. ## Thread: Tank Considerations: Pressure vs Vacuum.

by Hudson
Replies
3
Views
278

### You'd think it would work just fine as the...

You'd think it would work just fine as the external pressure is only 1/10 of the rated internal pressure capacity.
13. ## Thread: identifying proper motor

by Hudson
Replies
3
Views
223

### Another option is a stepper motor. You have 12...

Another option is a stepper motor. You have 12 Volts. You'll need, in addition to the motor, a driver that regulates D.C.direction and power to the motor coils to determine position and motion plus...
14. ## Thread: Best Way to Dimension Circular Features

by Hudson
Replies
3
Views
292

### An observation: The holes on the smallest bolt...

An observation: The holes on the smallest bolt circle are near the weakest part and none of the holes are aligned for manufacturing.
15. ## Thread: Identifying a force

by Hudson
Replies
6
Views
282

### The deliberate misalignment of locating pins...

The deliberate misalignment of locating pins creates an "interference fit".

by Hudson
Replies
5
Views
725

### Can you machine a 10mm hex on the end of the 12mm...

Can you machine a 10mm hex on the end of the 12mm shaft and let maintenance use a socket wrench and extension?
17. ## Thread: Stainless steel floor drain

by Hudson
Replies
4
Views
1,014

### A file or tiny grinder on a bottom edge would...

A file or tiny grinder on a bottom edge would remove any plating and reveal the base material.
18. ## Thread: Position tolerance with circularity

by Hudson
Replies
4
Views
814

### Why not tolerance a wall thickness to the O.D....

Why not tolerance a wall thickness to the O.D. that can be checked with a simple ball or tube micrometer instead of relying on CMM and inspection tables. Think like a machinist.
19. ## Thread: Is my tolerance stackup correct?

by Hudson
Replies
10
Views
994

### Do I see 'B' and 'C' datums as the edge of both a...

Do I see 'B' and 'C' datums as the edge of both a 3" and an 8" square part? Then you call out parts to be centered?

Why not make two bolt holes a common datum in the x & Y plane?
20. ## Thread: Help with design of rack

by Hudson
Replies
2
Views
970

### 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...
21. ## Thread: Mounting a planar mirror with epoxy

by Hudson
Replies
2
Views
645

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

Consider a urethane adhesive for windshields.

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

by Hudson
Replies
2
Views
1,018

### 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,...
23. ## Thread: How to Interpret Geometric Tolerance and Dimensional Tolerance

by Hudson
Replies
4
Views
2,022

### 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...
24. ## Thread: How much does the flow of a pipe get reduced if undersized couplings are used?

by Hudson
Replies
2
Views
883

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

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

by Hudson
Replies
5
Views
2,420

### .283 lbs/cubic inch

.283 lbs/cubic inch
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