Search found 53 matches

by gamh44
Sat May 11, 2019 5:16 am
Forum: Build Log
Topic: Constructing The Josslin NYC Hudson Lead Truck
Replies: 23
Views: 2112

Re: Constructing The Josslin NYC Hudson Lead Truck

Carrdo

Following along with your truck build - thanks for posting.
Carrdo wrote:
Fri May 10, 2019 11:13 pm
For these axles, cold rolled steel round bar was used.
So will you just have steel axles in steel axle boxes - or something between?
by gamh44
Sun Apr 21, 2019 4:08 pm
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

So I did the press test with the wheel that had 0.002" interference and the gauge on the press got to 5T before I decided enough was enough.

So onto the real deal and here is the first of four. Three to go. Quite happy with the result.
58. WheelsAxlesDone.JPG
by gamh44
Mon Apr 15, 2019 4:58 am
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Harold Thanks again. I took the test piece to work today and put it in the 20T press. It held well but I did manage to press it out. There was indeed a small amount of galling. I brought it home and redid the whole arrangement with about 0.002" interference. I needed to get the wheel quite a lot hot...
by gamh44
Sun Apr 14, 2019 3:06 pm
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Harold Thanks. I don't have a press handy but should be able to get access to one so I will see how that goes. By my calculations, to expand the inside diameter of the wheel 1.4 thousandths, it needs to be at 230*C, which should be about the first colour change of the metal to light straw. If I go t...
by gamh44
Fri Apr 12, 2019 8:42 am
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Harold Thanks for your thoughts and apologies for not being clear with my description. Using the 0.001" per 1" rule of thumb, the interference on 0.625" would be 0.000625" or just over 6 tenths of a thousandth as you say. I went for 1 thou over just to be sure so the ID of the wheel was 0.625" and t...
by gamh44
Thu Apr 11, 2019 9:40 pm
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Did a test today to see how the shrink fitting the wheel to the axle will go. Since this is something I have not done previously I used the test wheel I turned and machined up a small test stub axle based on the 0.001" per 1" rule of thumb. Unfortunately, not all the wheel boring ended up perfect. A...
by gamh44
Wed Apr 10, 2019 7:23 am
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

All Just finished the last wheel and here they are. 55. WheelsDone.JPG For reference, I found the receipt for the material, which is grade 1035 and referred to as a mid carbon steel (0.35% Carbon). Described as having good machinability but it is definitely harder than the mild steel (grade unknown)...
by gamh44
Sat Feb 02, 2019 7:34 pm
Forum: Live Steam
Topic: silver soldering steel to steel
Replies: 34
Views: 4831

Re: silver soldering steel to steel

The obvious question is; why not take a couple of pieces of the steel you are going to use and try to silver solder them together? This should give you all the answers you need before you put any significant work in what you want to make. Good advice! I have just done this with the N&W tender bogie...
by gamh44
Tue Jan 01, 2019 2:01 pm
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Dan and Harold Thanks once again for sharing your experience. It looks like I am now back on track (pun fully intended) to machining these wheels up in a reasonable amount of time. I dropped the spindle speed just one more pulley and things improved significantly. Cutting through the scale was done ...
by gamh44
Mon Dec 31, 2018 3:37 pm
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

Harold and Dan Thanks so much for your detailed replies. Here are some factors that I see contributing to the problem. A. machining experience B. tool grinding capabilities C. lathe size - power and rigidity (it is a relatively small lathe) D. material selection. Before I started on the real wheel, ...
by gamh44
Sun Dec 30, 2018 6:55 am
Forum: Build Log
Topic: N&W S1a Project - Tender Build
Replies: 35
Views: 7808

Re: N&W S1a Project - Tender Build

As above, I need to make a small adjustment to the bending jig to finish it all off, then onto mass production. So that has been set aside for a bit while the wheels are attacked. I picked up some discs from a (not so) local supplier and have managed to finish off one wheel - see photos below. Turns...