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Post by baggo on Jul 25, 2009 18:50:36 GMT
After messing about with other peoples locos for what seems forever I've finally made a start on the 'stretched' 0-6-2 Simplex. Some-one (can't remember who now  ) came up with the name Simply Longer so that's now her 'official' title! The frames are nearly complete and with the extensions are 4.75" longer than the standard ones. The one piece horn for the radial trailing axle is a fabrication from steel and brass with the curved guides rolled to the required radius. Hopefully they will only need a light skim to true them up to take the matching curved axleboxes. As one of our friends on another board is always saying, "too much fun!" John     |
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redmog
Part of the e-furniture
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Posts: 461 
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Post by redmog on Jul 25, 2009 19:27:15 GMT
Radial Trailing Axle.
Thanks for sharing your photographs with us John.
Looks like the new milling machine has been doing some work.
I look forward to following 'the build'.
John wrote -
''The one piece horn for the radial trailing axle is a fabrication from steel and brass with the curved guides rolled to the required radius. Hopefully they will only need a light skim to true them up to take the matching curved axleboxes.''
I'm not familiar with a 'radial trailing axle' and a 'one piece horn',
but I'm sure I will be if I follow your progress.
How did you roll brass plate of that thickness?
and - how do you intend to give it ' a light skim.' ?
or curve the axlebox to match?
Chris
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Post by baggo on Jul 25, 2009 19:58:39 GMT
Hi Chris, the radial axial truck is the equivalent of the pivoted pony truck and gives the same angular motion to the axle as the wheels move from side to side on the curves. My reason for using one is that the pivot point for a pony truck would come beneath the grate of the boiler which would cause problems with the ash pan etc. ( this loco will have a longer firebox than the standard Simplex to give more grate area). Adams fitted radial trucks to some of his tank locos although I don't know if he would have had the same problem with pivoting a pony truck? Giles has got a useful page on radial trucks at: www.gilesfavell.seriouslyinternet.com/Construction%20information.htmI'm not sure yet how I will skim the horns or shape the axleboxes! I think I may use my 6 inch rotary table with an extension plate bolted on to get the required radius (The radius of the centre of the slot is 6 inches). The curved guides are 1/8" brass and I managed to roll them (just!) in my George Thomas bending rolls. They needed annealing a couple of times though! John |
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redmog
Part of the e-furniture
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Post by redmog on Jul 25, 2009 20:22:50 GMT
Interesting Website.
Thanks John.
That's an interesting website.
I've put it into 'Favorites' for reference later.
Chris
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Post by ron on Jul 26, 2009 9:44:01 GMT
Hi John It's looking good and a very interesting mod, keep posting photos of the progress, this section has been a bit quiet recently. Ron PS surely it should be 'Simply Longish'  |
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Post by Deleted on Jul 26, 2009 11:10:10 GMT
Be careful Ron, I've got copyright on the 'Simply' bit!
JB
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Post by drjohn on Jul 26, 2009 14:42:00 GMT
Be careful Ron, I've got copyright on the 'Simply' bit! JB Probably with good reason! ;D  |
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Post by Deleted on Jul 26, 2009 17:48:45 GMT
Be careful Ron, I've got copyright on the 'Simply' bit! JB Probably with good reason! ;D Sticks and stones DJ, I'm glad that I was able to rattle your cage, and I trust you are well after your travels. However, I'm going over to my boat tomorrow to get away from this holding pen for the Jeremy Kyle Show, and I won't be back until mid September......WHOOPEEEEEEE! JB |
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Post by baggo on Jul 27, 2009 15:07:05 GMT
Today I milled the slot in the radial horns. I decided to use the rotary table with a length of 3/8" plate clamped on to get the necessary radius for the slot. The distance of the spindle of the mill from the centre of the table was set to the radius of the centre of the slot using a pin in the chuck and a centre in the table. The horns were then positioned on the end of the plate until the pin in the chuck followed the centre line on a paper template taped to the top of the horns. Using some screws through the horn mounting holes against the edge of the plate made adjustment quite easy. Once in position the horns were securely clamped to the plate A bit crude maybe but it works! The setup turned out to be quite rigid and the slot soon milled to size. I had to take less than 20 thou of each side to true them up so my rolling must have been reasonably accurate! It's a good feeling when things go well    |
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Post by drumkilbo on Jul 27, 2009 17:16:02 GMT
Nice work John, and nicely illustrated too.
Ian.
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steam4ian
Elder Statesman
One good turn deserves another
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Post by steam4ian on Jul 27, 2009 21:23:14 GMT
G'day John
Please keep the pictures coming. They are both instructional and inspirational.
Regards,
Ian
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Post by Shawki Shlemon on Aug 2, 2009 9:04:51 GMT
Well done John . The good feeling is what this hobby is all about . We like to achieve it as often as possible but when one does (like you have ) is great .  |
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Post by baggo on Aug 8, 2009 16:18:21 GMT
Finished up the rest of the bits for the radial axle today apart from the springs and spring plates.  The sliding horns are another fabrication from brass with the curved edges machined with the rotary table set up again. The axleboxes are mild steel fitted with needle roller bearings. The axle will be silver steel. With this arrangement the axleboxes themselves only move vertically. The sideways movement is taken care of by the sliding horns.  The sliding horns are held in position by a couple of bolts that run in curved slots in the stretcher. These are just to stop the whole lot falling out when you pick the loco up!  Main axleboxes next John |
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redmog
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Post by redmog on Aug 8, 2009 17:02:31 GMT
Nice to see.
John,
Thank you for sharing your interesting photographs.
I've learnt a bit about 'The Radial Axle'.
It's always inspiring and nice to see other peoples work.
Good quality photographs too.
Chris
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Post by baggo on Oct 8, 2009 15:39:17 GMT
Not wishing to be outdone by Ron and his Hunslet and Ian and his Ivo Peters (  ), I've been beavering away machining up the wheels, axles, axle boxes, and the axle pumps with the result that I now have a rolling chassis  Took it to the track today to check that it will go round the corners as I wanted to make sure that there was enough clearance between the radial truck wheels and the side of the frames before going any further. We have a ground level track with very short radius curves and the chassis went round ok without anything touching. The only problem was that the spring pins on the radial axleboxes are too long and touch the 3½" rail on the raised track but that's a minor problem soon corrected. The axles are silver steel running in needle roller bearings and should last a lifetime. I've replaced the Martin Evans double acting axle pump with two simple single acting ones fitted with poppet valves rather than balls just as another experiment to see if the poppet valves are more reliable.  I always feel that I've reached a major milestone when I've got this far with a project. For me, things seem to go a bit quicker from now on. This things getting heavy already so I'm going to have to make a proper building stand for it! John |
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sapper
Involved Member
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Post by sapper on Oct 9, 2009 17:21:35 GMT
Don Young designed a 5" gauge Lancashire & Yorkshire 2-4-2 Tank Engine some years ago. That had radial axles at both ends and Joy valve gear.
There is a full size example in the National Rail Museum York.
I seem to remember that it was serialized in the American Magazine Live Steam.
Keep the photos coming its better than subscribing to a magazine.
Sapper
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Post by drumkilbo on Oct 13, 2009 12:00:42 GMT
Nice work John [as always !] I've actually done nothing to Ivo Peters for about a month, since it stopped raining really so I'm looking forward to Winter. I know what you mean about it getting heavy too Ian. |
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Post by ron on Oct 14, 2009 15:09:36 GMT
Hi John
You might have seen from another thread I've bought the drawings and castings for a Southworth boiler feed pump, he gives optional designs for using ordinary ball valves or poppet valves but states that the poppets are more efficient.
Ron
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Post by baggo on Oct 14, 2009 15:32:07 GMT
but states that the poppets are more efficient I'll let you know in about 12 months time ;D Busy tarting the chassis up for the show this weekend I had hoped to have a bit more done but times not been on my side. John |
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Post by welshy on Oct 14, 2009 20:47:22 GMT
Hi John looking very neat on the workmanship as to be expected from you, it looks a nice chunky chassisand more interesting than the standard Simplex with the radial truck. Well done.
Are you showing the chassis at the Midlands show? if so i will have a proper look at it on Saturday when i am there.
Mike
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) came up with the name Simply Longer so that's now her 'official' title!
), I've been beavering away machining up the wheels, axles, axle boxes, and the axle pumps with the result that I now have a rolling chassis 