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Post by jbodenmann on Mar 14, 2010 4:37:37 GMT
Hello My Friends Here are some shots of the little 0-6-0 cylinders. Most of this work was done a couple months ago. Todays job was to make the rings for the valve and the valve spool. This engine was modeled after a USRA 0-6-0. The USRA designs were an attempt to standardize locomotive production during World War Two. Some of the designs were quite successful and continued to be built for some time. This model was designed by Mr. Henry Coventry in the 1940's. There were quite a few built back in the days when 3/4" scale was popular here in the States. The patterns and drawings languished for many years until being resurrected by my friend John K at Friends Models-Yankee Workshops. This is the first Coventry 0-6-0 to be built in over forty years. Here are the cylinders as they arrived. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:39:16 GMT
Just getting started. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:40:54 GMT
Facing off a spot so the drill will enter properly. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:42:05 GMT
Facing a piston ring in a soft collet. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:43:05 GMT
Gapping a piston ring. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:46:24 GMT
Now that the rings have been gapped they have been stuffed in the compressing ring. This will compress then so that they can be clamped to a mandrel and turned. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:52:01 GMT
The rings and compression sleeve have now been slid over the turning mandrel. A washer and cap screw have been placed on the end of the mandrel and tightened. The compression sleeve was then slid off, now the rings can be turned to the size of the bore they will operate in, in their compressed state. Attachments:
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Post by jbodenmann on Mar 14, 2010 4:54:46 GMT
Now we are getting somewhere. Cylinder castings mostly machined, pistons and rods done. I really like 3/4" scale, such a nice size to build in. Attachments:
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Post by jbodenmann on Mar 14, 2010 5:01:45 GMT
One more for now. Eensy weensy little rings and valve spool. Valve spool 932 bronze. The rings for the valve are 5/8" OD. The piston rings are 1-1/8" OD both gray iron. Valve stem 1/8" 303 stainless. There will be a castellated nut and cotter pin to hold the valve spool together. No shortage of things to do... Jack Attachments:
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Post by alanstepney on Mar 14, 2010 6:29:08 GMT
I am sure that I am not the only one here that enjoys seeing your photos.
Thanks for your efforts in posting them.
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Post by Tel on Mar 14, 2010 11:08:28 GMT
Yep, I enjoyed 'em as well - nice photo series
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Post by jbodenmann on May 15, 2010 0:40:28 GMT
Here are a few more. Haven't been able to get much done on the little engine. Attachments:
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Post by jbodenmann on May 15, 2010 0:48:17 GMT
Rear valve head and crosshead guide. The original design by Henry Coventry called out for a casting, but without a packing. Even though, only subject to exhaust pressure to me a packing is called for. After all, her full size sisters had packings on the valve stems. So this little bit was fabricated. The packing gland nut is silicon bronze with a 5/16"-40 thread. The valve stem 1/8". Attachments:
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Post by jbodenmann on May 15, 2010 0:51:51 GMT
Here are a couple of the mostly finished cylinders. No shortage of things to do. Jack Attachments:
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Post by jbodenmann on May 15, 2010 0:54:59 GMT
Last One for now Happy Model Building Jack Attachments:
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Post by Shawki Shlemon on May 16, 2010 9:21:17 GMT
It is most interesting to see how other people do things . very nice job and pictures .
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davidp
Active Member
Posts: 10
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Post by davidp on May 24, 2010 5:27:09 GMT
Jack,
never thought of the 'capstan' approach to tightening the gland nuts (14 Mar photo).
very neat
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Post by jbodenmann on Dec 24, 2010 17:31:03 GMT
Hello My Friends Took Christmas week off to get a bit done on the little 0-6-0. I have been real busy this past summer and haven't made any progress on the engine since May. How time flies. So the crossheads and crosshead guides (guide bars) seemed to be the logical place to resume. The crossheads are a blend of metal sculpture and precision machining, so here we go. The crossheads started out as a length of 1" round cold rolled. Here the boss in which the piston rod will fit has been turned. The piston rod will fit into the crosshead with a one in five taper and will be held in place with a taper pin. Attachments:
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Post by jbodenmann on Dec 24, 2010 17:37:32 GMT
It sure feels good to be back making progress on the 0-6-0 as I have bought a new property and will be building an elevated line for 3-1/2" and 4-3/4" gauge. Hopefully some of my 3-1/2" gauge friends from across the pond will come and visit. Here the work piece has been moved to the milling machine and will be milled across the top and bottom utilizing the spindex. Attachments:
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Post by jbodenmann on Dec 24, 2010 17:41:24 GMT
Now that the top and bottom have been milled the part has been rotated and the sides have been machined off. Here the crank pin hole has been located, center drilled, drilled, and is now being reamed to size. The spindex is an inexpensive and most versatile little trinket that I absolutely could not get by without. Several operations on this part are being made here without removing it from the tool, making our task much faster and easier. Attachments:
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