dalboy
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Posts: 235
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Post by dalboy on Jun 27, 2022 17:31:16 GMT
After the step back problem with the quartering I have got back to the coupling rods spent the day by drilling the outer holes larger to fit the crankpins followed by filing them until everything move freely as described in the Rob Roy book of words this was a slow job but worth spending the time on it. Now I can drill them out to accept the bushes. Then down to getting all the waste metal off and make them at least look the part. DSCF2608 by Dalboy, on Flickr The second photo I just put the connecting rods on. DSCF2615 by Dalboy, on Flickr
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uuu
Elder Statesman
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Post by uuu on Jun 27, 2022 18:59:31 GMT
Just an idea - if you take the waste metal off first, you can re-check the length before final fitting of the bushes. In the Pumphouse, we had a set of rods change length by quite a lot during the outer shaping.
Wilf
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Jun 27, 2022 19:29:27 GMT
Just an idea - if you take the waste metal off first, you can re-check the length before final fitting of the bushes. In the Pumphouse, we had a set of rods change length by quite a lot during the outer shaping. Wilf Good thought may do that tomorrow just leave enough on the end to shape the round section and oiling point. Getting close to starting the cylinder assemblies
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Jul 5, 2022 9:14:00 GMT
Had to order a new piece of steel for the coupling rod that I messed up but in the meantime started on the slide valve to give me something to do. DSCF2624 by Dalboy, on Flickr The steel arrived and have started to mark out so hopefully should be back to where I was with the coupling rods. This is the great thing that if you need to wait for something there are always other bits that can be made
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JonL
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WWSME (Wiltshire)
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Post by JonL on Jul 9, 2022 12:05:03 GMT
There is always something to do! I don't often walk in to my workshop and find nothing that needs doing (other than tidying up of course)
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Jul 9, 2022 15:45:38 GMT
There is always something to do! I don't often walk in to my workshop and find nothing that needs doing (other than tidying up of course) I seem to spend quite a bit of time tidying up as it makes it nice to find things again knowing they are in the right place when wanted
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 1, 2022 21:01:55 GMT
After a little time I managed to get back onto the Rob Roy spent today working on the cylinder blocks and now have some surfaces to work from. Sorry no photos. Found that I had to do some very careful marking and cutting as not a lot of material spare.
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 2, 2022 21:41:17 GMT
As stated above machined some surfaces on the cylinder block to give me a reference to work from. Waiting for some more bits so that I can get it right. These can be seen in the photo, also are the two steam chests as I thought I would at least still move forward and get something worked on while waiting. Three of the outer edges are machined ready to go in the lathe to turn to length as well as drill for the valve spindle also need to complete the inner surfaces to size which is tomorrows job. just not enough hours to play in the workshop what with other things taking up my time, I feel like I have less time than when I was at work
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,906
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Post by JonL on Aug 3, 2022 17:13:06 GMT
Lovely finish so far, life does get in the way of the important things doesn't it?
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dalboy
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Posts: 235
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Post by dalboy on Aug 3, 2022 20:04:08 GMT
Lovely finish so far, life does get in the way of the important things doesn't it? It certainly does but at least most of the things that get in the way I enjoy as well. As i stated elsewhere too hot to do any time consuming jobs on the Rob Roy
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 4, 2022 18:28:23 GMT
More work on the steam chests all of the outer surfaces are now machined to size just need to mount them to do the inner square section and the bolt holes. I did spend quite a bit of time setting them up in the four jaw chuck to turn the gland housing this being the first time I have used the four jaw in anger took a bit of time even following some of the videos I have watched the second one took a fraction of the time. I did make a very minor mistake and that was I used something which was too thin to protect the machined surfaces and still marked the outer edge on one of them the second I found some 3/8" thick ali as a packing lesson learnt, luckily these are inboard of the frames so will not be seen. I still take a lot longer than most of you doing simple machining but there is no rush and I am enjoying the journey.
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 5, 2022 21:08:00 GMT
Slow progress today managed to machine the centres of the steam chests nest job will be to drill and thread for the packing gland nut. I will drill the holes to secure the chest later. DSCF2692 (2) by Dalboy, on Flickr you can see where I used too thin material to hold it in the four jaw chuck as well as the fact I may have tightened too much. They look deeper than they actually are DSCF2693 (2) by Dalboy, on Flickr
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Post by Rex Hanman on Aug 5, 2022 21:46:46 GMT
Engrave a "security number" in each rectangle, then it will look deliberate!
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Rob Roy
Aug 5, 2022 21:54:42 GMT
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Post by GWR 101 on Aug 5, 2022 21:54:42 GMT
Hi, just a thought as I am not that familiar with the design but on my build the cylinder cladding comes up over the steam chest. Regards Paul
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 6, 2022 7:45:23 GMT
Hi, just a thought as I am not that familiar with the design but on my build the cylinder cladding comes up over the steam chest. Regards Paul Luckily they are inboard of the chassis and the cylinders are outboard, still I am annoyed with myself but have learnt from it. Everything is a total learning curve as this is the first serious venture into metal bashing and also first build
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millman
Part of the e-furniture
Posts: 296
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Post by millman on Aug 6, 2022 10:17:34 GMT
Dalboy if the jaw marks bother you you could take a light skim over that face to remove them or fill them with JB Weld, file flush when set and after a coat of paint nobody will know. When I am doing steam chests and the like in a 4 jaw chuck I use pieces of 3/16 gauge plate as jaw protectors, been using the same pieces for last 30 years.
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Post by brvoelker on Aug 6, 2022 14:15:22 GMT
a Tip when using Jaw Protectors (Packing Pieces), you can attach them to the Surfaces of say your Steam Chest with Double Sided Scotch Tape. It keeps the Packing Pieces in place. I use this Tip all the time n items such as Cylinder Components.
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 7, 2022 20:36:30 GMT
After some very careful calculations I set up a cylinder block on the mill and machined the two mounting flanges and their sides to match the width of the steam chest and once they were done removed some extra material from the port face to bring it down to the correct size. After these photos I mounted it and have started to bore the cylinder using a boring head for the mill hopefully this will prevent any taper in the bore by doing it this way. It would have been nice to be able to mill the steam ports but allas I did not have a cutter of the correct size not even one smaller so will have to spend some time setting up for that but can not see any problems. DSCF2708 by Dalboy, on Flickr DSCF2711 by Dalboy, on Flickr
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,906
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Post by JonL on Aug 8, 2022 9:57:39 GMT
Millingcuttersstore are very reasonable for carbide cutters I have found.
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dalboy
E-xcellent poster
Posts: 235
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Post by dalboy on Aug 8, 2022 10:15:25 GMT
Millingcuttersstore are very reasonable for carbide cutters I have found. Thank you for that I had already ordered a couple as they are small just in case. So just waiting for them to arrive still have plenty of things to do not all metal working
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