peteh
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Post by peteh on Jan 11, 2012 13:24:19 GMT
It was still 30 degrees when I got home from work so took a leisurely tea break before opening the shed. Finished the second outside arm and got the shafts in nice and square. The shafts are a press fit and then silver soldered. Also started on the inner rocker arms. Silly question - can we put more than one photo in a post? Attachments:
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peteh
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Post by peteh on Jan 11, 2012 13:28:12 GMT
Here is a photo of the rocker shaft bearings in position and the partially completed inner rocker arms. Just need cutting off to length and then drilled and tapped for a grub screw . Attachments:
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peteh
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Post by peteh on Jan 11, 2012 13:30:39 GMT
After the melting episode I have brought a lighter duty torch  . My wife and I camp and rogaine during the year so I have plenty of gas cylinders which are also used in our camping stove. Attachments:
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peteh
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Post by peteh on Jan 12, 2012 13:30:51 GMT
Just a quick update and photo. The two inner rocker shafts are now completed. No more updates until Saturday as Club night tomorrow. Not sure but I may need to shorten the valve eccentric rods a little. Attachments:
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peteh
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Post by peteh on Jan 14, 2012 13:48:30 GMT
Bit too warm today for much work - finally got into the shed around 8pm. Couldn't do much noisy work so decided to make the springs. Attachments:
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peteh
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Post by peteh on Jan 14, 2012 13:51:19 GMT
Just another photo to show you how much energy there is in even a small wire spring. I was using a block of metal in the tool post to feed the piano wire but had my finger nearby when the end went through the block. Two deep cuts on the finger resulted.  Wind with caution! Attachments:
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Post by Shawki Shlemon on Jan 15, 2012 7:47:24 GMT
Pete , is that red paint or real blood , you want us to feel sorry for you ;D ;D . It is called experience , part of the building process , I am sure you will survive .  Well done on spring making , I hope they work for you . |
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peteh
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Post by peteh on Jan 15, 2012 9:26:27 GMT
Unfortunately it's the real thing |
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Andrew C
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Post by Andrew C on Jan 15, 2012 9:36:56 GMT
Hi Pete. It's not a proper engine until some claret has been spilt and you are not a proper engine driver until you have managed to burn your finger tips on some control or other So that's the first one sorted . I have lost count of the cuts and burns from my current project . Aptly named !! You'll mend so keep going Andrew |
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peteh
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Post by peteh on Jan 18, 2012 14:33:11 GMT
For the last few days I have been trying to sort out the valve eccentric and rocker gear. Each time I tried to turn over the axle the other end would travel almost the full height of the horns each time. Came down to several problems. Firstly the valve eccentric straps were machined under thickness, due to the castings being too thin in the beginning  . However the eccentrics themselves had been made first at the correct thickness. This gave some play in the eccentrics longitudinal position along the axle (hope that makes sense!) Filing down the eccentics to match the eccentric strap thickness helped but didn't quite cure the axle travel. Further investigation showed that one of the eccentrics was also just catching under the axlebox keep so the axlekeep was reduced by about 0.1mm and all is now good. The axle turns with much less force required now. You tube clip- hopefully attatched. Much happier now ;D ;D ;D www.youtube.com/watch?v=svvyFtMTr2I&context=C3a4ad1eADOEgsToPDskJLnTjLZZPIqkdPwDsSZvyP |
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peteh
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Post by peteh on Jan 19, 2012 13:08:32 GMT
The next logical step is the machining of the driving and trailing wheels. Photo shows driving wheel casting as supplied on the left and the right one has had the rear face turned to free the spokes (about 1.5mm! Attachments:
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peteh
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Post by peteh on Jan 20, 2012 12:58:53 GMT
Too hot to do much tonight - 7.30pm and still above 30! Spent about 1/2 hour just cleaning up the second driving wheel to the same state as the first - had sweat running down my legs while working at the lathe - very unpleasant (told you this was warts and all!) (just checked the BoM and at 8:30pm - half an hour ago as I type this - apparant temp is 30.7 and 51% relative humidity!) Attachments:
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peteh
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Post by peteh on Jan 27, 2012 12:04:58 GMT
No photo tonight but got the backs of the tender and trailing wheels done tonight. The webs between the spokes seem to be around 3mm thick and didn't have enough 'spare material' to get awaywith removing the back so will have to get the dremel out.
Won't be tomorrow though - 42 degrees - Yeek
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Post by doubletop on Feb 5, 2012 21:09:55 GMT
Pete
Hope it is going well? A long time with no contact, but I don't seem to get pings from this forum when posts are made.
You don't need to dremel between the spokes. I had the same problem and realised that all that is required is to machine out the the backs of the wheels around the spokes leaving the hub and rims the correct thickness. I was concerned about strength of the spokes but it turns out to be the accepted practice. When the other PeteH sent me my replacement wheels, already machined, that's how they came.
Pete
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peteh
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Post by peteh on Feb 5, 2012 22:42:24 GMT
You don't need to dremel between the spokes. I had the same problem and realised that all that is required is to machine out the the backs of the wheels around the spokes leaving the hub and rims the correct thickness. I was concerned about strength of the spokes but it turns out to be the accepted practice. When the other PeteH sent me my replacement wheels, already machined, that's how they came. Pete Unfortuntely there won't be enough thickness in my castings to do this. I have around 1mm of spare thickness and the webs are really thick. I think in this case it will be a case of drilling in the corners and then cleaning out with the dremel. |
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Post by doubletop on Feb 6, 2012 8:36:37 GMT
Pete I mean like this; GLR supplied ready machined on the left and all my own work on the right (done before GLR sent the replacements)  As your wheels also came from GLR I'd imagine the same approach would apply. Pete |
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shooter
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Post by shooter on Feb 7, 2012 23:19:32 GMT
Hi Guys,
Perfect timing with the picture of the machined wheels! Have just taken delivery of six tender wheels for "Doris" from Peter at GLR and was scratching my head, after taking some measurements, as to how to release the spokes without completely removing the flange. The answer is obvious once it is pointed out!!
Sorry this is not related to this thread but wanted to just say thanks for the education!
Regards Steve
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peteh
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Post by peteh on Feb 9, 2012 5:14:19 GMT
As shooter says - easy once you see the picture At the moment it is still pretty warm here in Perth so I'm on hold still for a little while |
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peteh
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Post by peteh on Mar 6, 2012 1:43:29 GMT
Well after a very long and hot summer I have finally made it back into my shed. Started turning the blanks for the connecting rods. First photo is the marked up blank. This has been centre drilled both ends. Attachments:
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peteh
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Post by peteh on Mar 6, 2012 1:44:23 GMT
Reducing the waist for the circular rod section Attachments:
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. My wife and I camp and rogaine during the year so I have plenty of gas cylinders which are also used in our camping stove.
. However the eccentrics themselves had been made first at the correct thickness. This gave some play in the eccentrics longitudinal position along the axle (hope that makes sense!) Filing down the eccentics to match the eccentric strap thickness helped but didn't quite cure the axle travel.
