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Type: Posts; User: Kelly Bramble

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1. ## Thread: Machinery's, Roark's Stress and Strain, etc.

by Kelly Bramble
Replies
2
Views
222

### Machinery's, Roark's Stress and Strain, etc.

Ok, throughout my career I have used Machinery's Handbook for design and Roark's Stress and Strain Formulas for my engineering analysis.

These two books are well know in mechanical design and...

by Kelly Bramble
Replies
6
Views
242

### Mathcad prime is about \$630 per year as a...

Mathcad prime is about \$630 per year as a subscription. They store/keep your calculation sheets. There is a stripped down version called "worksheet library" which has limited capabilities and costs...
3. ## Thread: GD&T floating Fastener Formula question

by Kelly Bramble
Replies
2
Views
465

### No, each layer "floats" because the features are...

No, each layer "floats" because the features are clearance holes / features. Just like with two floating parts assembled by a through fastener the four features may require full assembly with all...
4. ## Thread: Basic or not?

by Kelly Bramble
Replies
2
Views
503

### Unless there is a geometric tolerance to the...

Unless there is a geometric tolerance to the feature defined by that center line the Basic dimension is not needed. However, a limit dimension is required since all features should be specified one...
5. ## Thread: Motor and Gearbox Pairing

by Kelly Bramble
Replies
2
Views
529

### Start with torque and RPM requirements which will...

Start with torque and RPM requirements which will define gearbox requirements then size motor appropriately.
6. ## Thread: Physical height calculation of RA surface finishes.

by Kelly Bramble
Replies
1
Views
519

### See the following webages, bottom gives...

See the following webages, bottom gives references:

Surface Finish Roughness Metrology Tutorial
Surface Roughness Conversion Chart Tables
Surface Roughness (Finish) Review and Equations
7. ## Thread: Deck Mounted Winch - Force, Stress,

by Kelly Bramble
Replies
3
Views
618

### A "winch" or a "Windlass"? You'll want quality...

A "winch" or a "Windlass"? You'll want quality Stainless Steel bolts fresh or salt water. Determine what the "winch" installation specification are and do that..

You can do the 2D statics loading...
8. ## Thread: Stainless steel floor drain

by Kelly Bramble
Replies
4
Views
803

### Weight per volume is the only sure way less...

Weight per volume is the only sure way less material trace-ability.
9. ## Thread: Callout for threaded hole to be tapped straight

by Kelly Bramble
Replies
1
Views
628

### Typically, there would be a GD&T specification...

Typically, there would be a GD&T specification with the surface perpendicular to the threaded hole as a datum and then the threaded hole would be called out:

| Perpendicular | (diameter) Some...
10. ## Thread: Position tolerance with circularity

by Kelly Bramble
Replies
4
Views
646

### Function first, it needs to work - then consider...

Function first, it needs to work - then consider manufacture-ability.

There is not a requirement that "AVG" diameter must include a "Free State" specification - it's just an example.

ASME...
11. ## Thread: Position tolerance with circularity

by Kelly Bramble
Replies
4
Views
646

### By default and regardless of the dimensioning and...

By default and regardless of the dimensioning and tolerancing standard specified on the engineering drawing - All dimensional measurements shall be made with the part in a free state condition unless...
12. ## Thread: Is my tolerance stackup correct?

by Kelly Bramble
Replies
10
Views
807

### Seriously, we're not going to train via this...

Seriously, we're not going to train via this forum.. I'll do short answers but not comprehensive training..

Wish you the best.
13. ## Thread: Is my tolerance stackup correct?

by Kelly Bramble
Replies
10
Views
807

### Positional tolerances (and composite) with the...

Positional tolerances (and composite) with the apparent datums specified would require the distance dimensions be Basic or as Theoectical Exact Dimension (TED) if the standard incorporated is ISO.
...
14. ## Thread: Is my tolerance stackup correct?

by Kelly Bramble
Replies
10
Views
807

### Yes ~ it is assuming that reflects functional...

Yes ~ it is assuming that reflects functional requirements and the datums are specified on the right features - which it isn't.
15. ## Thread: Is my tolerance stackup correct?

by Kelly Bramble
Replies
10
Views
807

### On the engineering drawing ... are the distance...

On the engineering drawing ... are the distance dimensions expressed as +/- tolerances?

and, no your tolerance analysis is not close and you do not appear to have a basic understanding of the...
16. ## Thread: Pre-load on needle roller clutch

by Kelly Bramble
Replies
1
Views
706

### Find the bearing specifications and associated...

Find the bearing specifications and associated design installation requirements. If the install exceeds design requirements then expect accelerated time too failure.
17. ## Thread: Lever arm design

by Kelly Bramble
Replies
2
Views
812

### Engineers Edge Static's 2D modeler and Structural...

Engineers Edge Static's 2D modeler and Structural Calculator will allow you to define any mechanism and applied loads you want.

See:...
18. ## Thread: Referencing .STEP file as Basic Geometry

by Kelly Bramble
Replies
1
Views
745

### Yes, this is a common practice of having a note...

Yes, this is a common practice of having a note that "geometry and dimensional data shall be derived from the electronic database". Some organizations have a title block area defining the reference...
19. ## Thread: Heat Exchanger Question

by Kelly Bramble
Replies
1
Views
788

### Conservation of energy says that some of the...

Conservation of energy says that some of the rated power consumption will be turned into electrical function, such as light or whatever the electronics is doing and the balance left over turns into...
20. ## Thread: Bicycle axle material change, Uni project!

by Kelly Bramble
Replies
2
Views
734

### Looks like a fatigue crack turned failure over...

Looks like a fatigue crack turned failure over repeated applied stress. The root of the thread is a classic failure point -assuming the design and installation did not have shear force on the thread...
21. ## Thread: SolidWorks Stress Analysis question

by Kelly Bramble
Replies
2
Views
577

### The enclosure would be treated like a single...

The enclosure would be treated like a single component, loading defined and the highest stress areas computed. From there, a more detailed analysis conducted at those high stress areas and a Factor...
22. ## Thread: When to change a motor along with a capacitor?

by Kelly Bramble
Replies
2
Views
573

### The start/run capacitor is easy to test.. and the...

The start/run capacitor is easy to test.. and the fan motor can be tested as well. Usually checking the Y or Delta winding resistance and a run current check should be performed.

Certainly...
23. ## Thread: Mounting a planar mirror with epoxy

by Kelly Bramble
Replies
2
Views
501

### Well, yes it is. For example, if you own a car...

Well, yes it is. For example, if you own a car the rear view mirror mounting base is "epoxied" to the glass. Grooves can help with selected materials though I would consider circumference...
24. ## Thread: Bead Blasted Finish on Aluminum

by Kelly Bramble
Replies
1
Views
554

### Bead blasting specification often include the...

Bead blasting specification often include the bead size - nothing more.
25. ## Thread: Title block tolerance applied to hole diameter with geometric positional tolerance

by Kelly Bramble
Replies
3
Views
696

### Yes, in general there should not be any...

Yes, in general there should not be any redundancy in tolerance or dimension specifications. Can cause confusion and even conflicting requirements.
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