Recent Posts

Pages: [1] 2 3 ... 10
1
Your Own Design / Re: Kearsarge Windlass Engines
« Last post by steam guy willy on Today at 12:46:41 AM »
Quote from: crueby on April 17, 2024, 04:33:51 PM
And today is Hobbing Day!  With the gear held in an arbor that lets it spin freely, the Acme tap held in the chuck, it was adjusted till the teeth in the tap meshed with the precut gear teeth, such that if I turned the spindle by hand it would advance the gear without much binding. The cutter was set towards the front slightly, since the blank is over-thick still and the back side will be trimmed off. Started the motor on a slow speed, and started to move the mill table over to start cutting. Every few full turns of the gear the table was moved over another few thou, letting it cut all the way around the gear several times for each position. After a while, got down to full depth.

Closer look at the cutter and the tee

Hi Chris ,  I have allways wanted to cut some gears like this but have never had the need to do it ...did you have to rotate the gear by hand on all the cuts  or just the first rotation  ??  cool stuff and very satisfying to see it working !!! :ThumbsUp: :ThumbsUp:

Test fit of the threaded rod on the teeth as I went as well

When happy with the depth, it was set down horizontal again to trim off the second side

Here is the finished (well almost, need to cut a keyway in the center hole) gear with the side plates screwed on:

This gear is too big for my plating tank, may just paint it instead...
2
Your Own Design / Re: Kearsarge Windlass Engines
« Last post by steam guy willy on Today at 12:37:00 AM »
looking good and I like the graphics   getting there slowly  :ThumbsUp: :ThumbsUp: :popcorn: :popcorn:

Willy
3
From Plans / Re: Upshur's twin opposed cyl. engine
« Last post by Brian Rupnow on Today at 12:25:21 AM »
Today I cut cylinder head fins and made up a couple of rocker arm support towers. Not terribly exciting, but it took up most of my day. There is something a little fishy about the bearing support tower in the drawing package from Upshur. Haven't quite figured out what it is yet, but there is something about the #5-40 threaded holes tapped in the rocker arm support towers and in the head.

4
Your Own Design / Re: Kearsarge Windlass Engines
« Last post by cnr6400 on April 18, 2024, 10:50:37 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
5
Vehicles & Models / Re: Pennsylvania A3 Switcher (Kozo)
« Last post by cnr6400 on April 18, 2024, 10:46:22 PM »
 :ThumbsUp: :ThumbsUp: :ThumbsUp: :popcorn: :popcorn: :popcorn:
6
Engines / Re: Df's lego engine thread
« Last post by wagnmkr on April 18, 2024, 10:33:24 PM »
Thank You for the info. I will look around for some bits and pieces.

Cheers
7
Vehicles & Models / Re: Pennsylvania A3 Switcher (Kozo)
« Last post by Kim on April 18, 2024, 09:56:36 PM »
Chapter 32.2 – Ventilator

Before I started on the Ventilator, I had to take care of a couple of things on the roof that I hadn’t finished up yesterday – I had to file off the heads of the screws that were used to hold things in place for soldering.


And I needed to file off the excess length of the roof edge pieces.  I started with the file, but being a lazy person by nature, I moved to the belt sander rather quickly.  This picture was taken just before I moved to the belt sander :)


With that done, I started on the ventilator.  This is not a working vent, it's just for looks.  It is made from two pieces of 1/8” x 1 1/4” CRS bar.  The first one is the base which was trimmed a bit with a shallow channel taken out to make it sit level on the slight curve of the roof.


The second part is a little bigger than the base but has no interesting feature other than the countersunk attachment holes.  Here are the two parts of the ventilator.  The base is on the left and is upside down in this picture.


And here’s the roof, complete with ventilator.


Next will be the cab front.

Kim
8
Your Own Design / Re: Mercedes-Benz W165 Grand Prix engine in 1:3 scale
« Last post by Vixen on April 18, 2024, 07:42:59 PM »
High Pressure Fuel Pump

The next item on the seemingly endless list (I don't expect to be starting another of these epic engine builds, so I had better make this one last) is the high pressure fuel pump, driven off the left hand accessories shaft, outboard of the supercharger scavenge oil pump. The full size W165 engine pumped a toxic mix of methanol, nitro-benzine, acetone and ether into the supercharged engine at high pressure and high flow. The tiny 1.5 litre engine consumed fuel at about 3 or 4 miles per gallon, at full chat.

The fuel pump is a straight forward gear pump. There is an external pressure relief valve to control the fuel pressure delivered to the two carburetors.

I started with the adapter flange which attaches the fuel pump body to the scavenge oil pump. The adapter flange starts life as 30mm diameter aluminium bar stock. The first operation is in lathe, to turn the outside profile and bore the central hole for the bearing. You will notice, I used a 2mm radiused parting tool blade to make the profile cuts. These parting blades willingly cut sideways as well as make plunge cuts; provided the depth of cut is kept small. I machined these profiles using many passes each with the depth of cut increased by 10 thou. All that repetition only takes a few minutes with the CNC and the radiused corners are very pleasing to the eye.




After parting off, the four mounting holes in the scavenge pump flange were drilled to size.




The embryo adapter flange could now be bolted on to a sacrificial jig plate to enable the fuel pump flange to be machined. I picked off the centre of the bearing hole as my datum and machined the square outside profile and drilled and tapped the four mounting holes. The register hole for the second gear shaft was also completed, all at the same datum setting.






The fuel pump body and the outside cover plate were the next items. Both parts were straight forward profile milling operations. Both used same sacrificial jig plate, with four new mounting holes drilled and tapped to match the flange on the previously made adapter.






Here are the three part finished components sitting in line wondering what happens next.




The final (for now) operation on the fuel pump body was to drill and tap and round off the three input/ output bosses. The external pressure relief valve fits above the lone boss on the side. All connection to the fuel pump will be with banjo fittings.






There's more to follow, so stay tuned

Cheers   :cheers:

Mike
9
From Plans / Re: 30ft 1890's navy steam launch 1/6th scale
« Last post by tghs on April 18, 2024, 07:21:56 PM »
Stacked fire bricks to form a box, small crucible, mapp gas torch,, I do have a small furnace if I need to melt larger amounts but will need to get a propane tank,,.. I'm calling this a good trial run!!! wasn't expecting much!!! I can calculate the needed brass by weight next time..
10
From Plans / Re: 30ft 1890's navy steam launch 1/6th scale
« Last post by crueby on April 18, 2024, 07:04:53 PM »
How are you melting the brass?  Don't recall, did you ever show your casting setup?
Pages: [1] 2 3 ... 10
SimplePortal 2.3.5 © 2008-2012, SimplePortal