Search found 103 matches

by thunderskunk
Sat Sep 16, 2023 10:01 am
Forum: Build Log
Topic: CPR G5C Class 1246 Pacific
Replies: 34
Views: 37172

Re: CPR G5C Class 1246 Pacific

[*]How often, if ever, do live steam modelers use forgings instead of castings? I've got a set up for propane blacksmithing and a plazma cutter, so most of what I do will be dictated by what I can make stock look like using those tools.[/list] Alright... It's been 5 years or so. I found this video ...
by thunderskunk
Wed Aug 09, 2023 10:02 pm
Forum: Live Steam
Topic: Seeking source: Full size Case traction engine drawings
Replies: 4
Views: 1505

Seeking source: Full size Case traction engine drawings

Long time no see. I'm told full size traction engines are on the rare side of ownership simply due to size, and I believe it. In the spirit of curiosity, does anyone have a good source for Full-size drawings of American traction engines? I picked Case out of a hat. There's a few out there for variou...
by thunderskunk
Fri Jul 14, 2023 10:50 pm
Forum: Grand Scale Railroading
Topic: Minimum radius for 2 ft. gauge
Replies: 15
Views: 19072

Re: Minimum radius for 2 ft. gauge

Here is an informative and similar thread. http://www.chaski.org/homemachinist/viewtopic.php?t=94864 It’s a quick read as only 5 or 6 replies. The essence is, the trailing truck can disproportionately increase minimum turning radius. Also, a quick rule of thumb mentioned is: wheelbase (W) times 20 ...
by thunderskunk
Mon Feb 28, 2022 6:07 am
Forum: Live Steam
Topic: Steam railroading to return to Alaska!
Replies: 259
Views: 267371

Re: Steam railroading to return to Alaska!

Sorry if it’s a silly question, but how did it get 1/4” off?
by thunderskunk
Fri Jan 07, 2022 8:22 am
Forum: General Discussion
Topic: How precise are measuring instruments?
Replies: 43
Views: 18165

Re: How precise are measuring instruments?

I think it's great to see this additional and mostly less well known information. Ron's original question was how precise are measuring instruments. By now he must be thinking he got a great deal more than he was expecting with that simple question. There's a whole lot more to it than just what the...
by thunderskunk
Thu Jan 06, 2022 1:29 pm
Forum: General Discussion
Topic: How precise are measuring instruments?
Replies: 43
Views: 18165

Re: How precise are measuring instruments?

Funny you mention it, I learned the other day about the Linearity and Bias study. Pretty much exactly like the incremental block you’ve got there: you measure several different parts of varying sizes with a calibrated size, then measure each of those parts several times. I just did this for a 2D las...
by thunderskunk
Mon Jan 03, 2022 4:28 pm
Forum: General Discussion
Topic: How precise are measuring instruments?
Replies: 43
Views: 18165

Re: How precise are measuring instruments?

I got a little red book: “Inspection and Gaging,” which I think another member here recommended. Actually has a section on squares, and had some interesting points: while you can see breaks in light between two objects to some ridiculously low number, something like .000005”, your eye can’t differen...
by thunderskunk
Wed Dec 29, 2021 8:26 am
Forum: General Discussion
Topic: How precise are measuring instruments?
Replies: 43
Views: 18165

Re: How precise are measuring instruments?

I need help with a couple of your acronyms: We can?t ignore GD&T because ... What's GD&T? we call that study a GRR And what's GRR? -- Russell Mac GDT= Geometric Dimensioning and Tolerancing. It’s the “design intent” way to dimension a part. There’s a whole standard (ASME Y14.5) that says wh...
by thunderskunk
Wed Dec 29, 2021 3:20 am
Forum: General Discussion
Topic: How precise are measuring instruments?
Replies: 43
Views: 18165

Re: How precise are measuring instruments?

The question has come up as to how square is a table saw blade to the table. If you want the blade to be exactly 90°square to the table, you would use a machinist's square and check for any light (gap) between the square and the blade. The question is; how precise is a machinist's square? Is there ...
by thunderskunk
Fri Nov 19, 2021 4:34 pm
Forum: Live Steam
Topic: Tracks to the Trenchs World War 1 Commenmoration
Replies: 32
Views: 25912

Re: Tracks to the Trenchs World War 1 Commenmoration

I’ve almost worn out my copy of “narrow gage to no man’s land.” I’m experimenting with scaling in Solidworks. I got it to work in a way that you draw the model based on full-size prints, make configurations specific to a scale, then modify certain dimensions for stock sizes and such. The Davenport r...
by thunderskunk
Thu Jun 17, 2021 7:28 am
Forum: Live Steam
Topic: Tracks to the Trenchs World War 1 Commenmoration
Replies: 32
Views: 25912

Re: Tracks to the Trenchs World War 1 Commenmoration

pat1027 wrote: You might be interested in the book "Narrow Gauge to No Man's Land" by Richard Dunn ISBN-10 : 0961546727
This book is AWESOME by the way. Thanks!
by thunderskunk
Tue Jun 15, 2021 7:46 am
Forum: Live Steam
Topic: Slide valve
Replies: 49
Views: 23341

Re: Slide valve

Sorry for opening the can of worms; everyone was being so civil until I showed up.