Search found 44 matches

by David_T
Wed Mar 30, 2011 12:18 am
Forum: Live Steam
Topic: Kozo Pennsy A-3 Tender Trucks in 1.5" / 7.5 gage
Replies: 4
Views: 975

Re: Kozo Pennsy A-3 Tender Trucks in 1.5" / 7.5 gage

Since you are doubling the SCALE, you are only doubling Kozo's 3 1/2" GAUGE. I hope you have not started your engine frame. It will have the same issue. Look at the back to back dimensions. Subtract 2x the 3/4 scale (3.281) from the 7.120 or whatever you prefer for 7 1/2 gauge. 2x 3/4" scale is .563...
by David_T
Thu Mar 17, 2011 11:26 pm
Forum: Live Steam
Topic: Bearings and Seals
Replies: 13
Views: 2050

Re: Bearings and Seals

Bearing and seals are usually pretty generic. Look for the same size, not Manufacturer. I know McMasters has a bearing that is a 1616 size. That is a 3/4 shaft, 3/4 long bearing. That B-1616 is a roller bearing part number, right? Do not forget to harden the shaft or use a sleeve insert. Bearing Inc...
by David_T
Fri Mar 04, 2011 1:07 am
Forum: Live Steam
Topic: Axle/Race help?
Replies: 19
Views: 2752

Re: Axle/Race help?

How many thou's difference between the race and axle?
To many and they will never press together.

Someone throw in the correct spec. I think it is around 1 or 2 thou's per inch diameter.

You only have to freezer metal for 2-3 hours. Heat up the sleeve 500-600 degrees.
by David_T
Sun Jan 23, 2011 10:11 pm
Forum: Live Steam
Topic: Cylinder drain cocks?
Replies: 19
Views: 4522

Re: Cylinder drain cocks?

Always the problem with NG engines. If you have not made any holes, do not put them on the bottom. Angle them from off center and get some extra ground clearance. Compare between ground clearance with them straight down and if they are 20-30 degrees off centerline. Also do not forget they are alread...
by David_T
Sun Jan 16, 2011 1:04 am
Forum: Live Steam
Topic: Questions of the week re my Kozo build
Replies: 7
Views: 1176

Re: Questions of the week re my Kozo build

I find parts No 6 and 7 reversed. Per page 82 where the dimensioned drawings are located. No 6 is a small plain bushing for the main rod small end and No 7 has the shoulder for the big end. Later book versions may be correct. Mine is copyright 2001. My expert builder resource says 0-4-0s and 4-4-0s ...
by David_T
Fri Jan 14, 2011 8:05 pm
Forum: Live Steam
Topic: Questions of the week re my Kozo build
Replies: 7
Views: 1176

Re: Questions of the week re my Kozo build

I hope you have notice that figs 13-1 and 13-2 have mislabeled bushing part numbers. I start in CAD with the back to back spacing of two drivers of the finished thickness. I then work inwards. Spacing for lateral movement. A 0-4-0 does not need much. Then the axle boxes. Center frame over axle box s...
by David_T
Sun Jan 02, 2011 10:43 pm
Forum: Live Steam
Topic: Cylinder/port/piston design
Replies: 20
Views: 2266

Re: Cylinder/port/piston design

From what I have read, most tracks have a six-seven mph limit. 6" drivers have to turn 56rpm to go 1 mpg. That 560 rpm for 10 mph. That is 9.3 strokes of the piston per second. I have read that 250 rpm or so is the real practical guide of a model steam locomotive maxium rpm. Rod engines, not the 3 c...
by David_T
Sat Jan 01, 2011 12:46 am
Forum: Live Steam
Topic: Narrow gauge Kozo shay
Replies: 24
Views: 5699

Re: Narrow gauge Kozo shay

Since the Kozo Shay is standard gauge, if you rescale it to F (1' = 15mm), it would make a nice locomotive. The problem I see is when you put the 3' (45mm gauge) narrow gauge trucks under it. This will be too much mis-alignment between the engine shaft (standard gauge locomotive location)and the tru...