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Post by Deleted on Aug 17, 2014 21:17:07 GMT
I do hope that they are not of the same ilk as the recent "Dick Stockings" scandal ??..........."Horley Drill Services ?"...she said with a wink !!............
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Post by GeorgeRay on Aug 17, 2014 21:19:48 GMT
Julian Did you ask Tracy tools whether they had left hand taps in the size you wanted. They don't normally take left handed to exhibitions. I would be surprised if they didn't have them in stock in their very large warehouse in Torquay. I called in during the summer and was amazed how huge the place was compared with the cramped premises in Dartmouth. I have had 5BA and 1/4 whit left hands from them but they never had them at exhibitions. Try giving them a ring.
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Post by Deleted on Aug 17, 2014 22:17:43 GMT
While I slowly come back to the fold I thought I might throw in a short thread on scale fittings using the Amsbury designs. This one shows the form tool I made and used. I have a much longer detailed thread but it contains yet another DJ diatribe so I thought best not to include it! John modeleng.proboards.com/thread/4630/brit-progress-globe-valves
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Aug 17, 2014 22:23:08 GMT
thank you for all your suggestions.
its a left hand 5/32" whitworth tap and die i need if the blowdown handles are to 'handed'.
ive got 5/32" whitworth ordinary taps and die. the idea of using a 32 tpi thread is to get sufficient opening on the blowdown handle with just a half turn.
cheers, julian
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Post by Deleted on Aug 17, 2014 22:30:44 GMT
While I slowly come back to the fold I thought I might throw in a short thread on scale fittings using the Amsbury designs. This one shows the form tool I made and used. I have a much longer detailed thread but it contains yet another DJ diatribe so I thought best not to include it! John modeleng.proboards.com/thread/4630/brit-progress-globe-valves----------- As a fairly new-boy on the block, I for one am glad to see you posting again JOHN......Regarding those " Unpleasantness" items, I'm sure you can edit them out before posting....Seems a shame to waste good copy ( as the Newspaper chaps say )....Print and be dammed !!..............Be guided by the likes of the BBC when transmission re-started after the end of WW2...I believe they came out with}----- "--now, as I was saying!!"........
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Post by Roger on Aug 18, 2014 7:05:37 GMT
If you google this '5/32" whitworth LH' you'll find several places that list them... Here's one...
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Post by Roger on Aug 18, 2014 7:18:09 GMT
While I slowly come back to the fold I thought I might throw in a short thread on scale fittings using the Amsbury designs. This one shows the form tool I made and used. I have a much longer detailed thread but it contains yet another DJ diatribe so I thought best not to include it! John modeleng.proboards.com/thread/4630/brit-progress-globe-valvesI'm sorry to hear that you were put off posting, some people can be a little harsh and dogmatic at times. Looking at your globe valves, there's a lot you can share that will interest other members. Take no notice of anyone who disagrees with you. If I worried about that, I'd never post anything. Extensively using CNC and modern methods make me a prime target for petty sniping but I'm unrepentant. They can do it their way, and I'll do it an easier way, that's why converted my mill. I see you're using carbide PCB drills, they're a bit brittle but superb for this kind of work. I used the same technique for the form tools on SPEEDY, ie tilting up the gauge plate in the vice slightly, it doesn't need much. In my case I used the high speed routing head and a 1mm 2 flute to create the profile on the CNC. It's a handy way to transfer CNC capability from a milling machine to a manual lathe.
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pault
Elder Statesman
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Post by pault on Aug 18, 2014 10:39:36 GMT
Hi Julian At the risk of being accused of being on the dark side, a cheaper option could be to use M4 LH taps and dies, much easier and cheaper to buy. The difference between 5/32 and 4mm is only about a thou Regards Paul
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Post by Jim on Aug 18, 2014 22:57:40 GMT
While I slowly come back to the fold I thought I might throw in a short thread on scale fittings using the Amsbury designs. This one shows the form tool I made and used. I have a much longer detailed thread but it contains yet another DJ diatribe so I thought best not to include it! John modeleng.proboards.com/thread/4630/brit-progress-globe-valvesThank you John for reminding me of the beautiful back head fittings you made to Amsbury's designs. To my eternal shame I'd forgotten about them. Any chance of you speeding up your return to the fold? Jim
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Aug 19, 2014 20:48:35 GMT
thank you john for posting the link to your excellent globe valves thread.
im afraid im not going to spend out a lot of money on L-H taps and dies just for one blowdown valve.
the 'obvious' solution is that if ever STEPNEY gets exhibited (which i very much doubt as not my thing at all) one of the blowdown valve handles will get turned 1/2 a turn so they both point the same way ie downwards and no one (except all you lot!) will know that the offending blowdown isnt in the closed position.
ive been playing around this evening with a variation to my sketch of same, making some caps out of 1/4" AF hex threaded 7/32 x 40 tpi on the outside and tapped 5/32" whitworth inside for the handles. this looks promising and might be what i end up with. ive threaded some 4mm sifbronze rod 5/32" whitworth to have a go at some trial handles, though would rather like these to end up as stainless in due course.
all a bit fiddly, but then isnt that the fun of making things in miniature?
cheers, julian
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Post by Jim on Aug 21, 2014 0:42:00 GMT
im afraid im not going to spend out a lot of money on L-H taps and dies just for one blowdown valve. the 'obvious' solution is that if ever STEPNEY gets exhibited (which i very much doubt as not my thing at all) one of the blowdown valve handles will get turned 1/2 a turn so they both point the same way ie downwards and no one (except all you lot!) will know that the offending blowdown isnt in the closed position. cheers, julian Have no fear Julian, my lips are sealed . Though come to think of it they could be loosened with the promise of a soothing ale or two. Jim
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Post by suctionhose on Aug 21, 2014 3:41:06 GMT
Hi Julian At the risk of being accused of being on the dark side, a cheaper option could be to use M4 LH taps and dies, much easier and cheaper to buy. The difference between 5/32 and 4mm is only about a thou Regards Paul For single use specials I make taps up quickly from silver steel. Nothing flash. Got a box of "homemades" now, left hands, multi starts, square threads, weird dia's & pitches. Made some broaches too for squaring the holes in handwheels. Even made a broach for a 1/16 keyway through 1.5" of high tensile steel - not much left of that after one keyway...
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Aug 21, 2014 10:19:35 GMT
thanks jim and ross,
this is a bit of a wild card appeal, but has anyone taken apart the lovely blowdown valves that dave noble makes for his water gauges? if so, what's inside please?! is it a plug cock perhaps with 'O' rings fitted, or PTFE sleeved parallel cock as used by C R Amesbury, or a simple 'inline' globe valve?
cheers, julian
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Post by ejparrott on Aug 21, 2014 10:43:22 GMT
Yes I've had mine apart, been a few years though. I think it's actually a ball turned on the end of the handle with some sort of plastic rings sealing them. Don't know if they're PTFE. There's only one access point, remove that and the handle and everything comes out, he must bend the handles after that is fitted over 'cos I couldn't get it off again!
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Post by Deleted on Aug 21, 2014 12:57:49 GMT
Hello all----------- have just dug these out of The Bear's stock stores.....I can't find the original packing but as "young" Mr. Parrot says}--- there is a ball on the end of the shaft and two small pieces of white plastic press onto it from either side...........A real masterpiece in miniature engineering !! EDIT}-------- That's a wooden peg it's resting against .>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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uuu
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your message here...
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Post by uuu on Aug 21, 2014 15:51:29 GMT
Dave Noble's catalogue describes PTFE
Wilf
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jma1009
Elder Statesman
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Post by jma1009 on Aug 21, 2014 20:02:27 GMT
thank you Ed, Alan and Wilf re details of the dave noble valves - any further info would be very much appreciated! major cock up realised this evening! why i didnt think about this problem earlier i dont know - my brain must be getting addled. ive made some 'inline' globe valves as small as i can get them, but wont be able to connect up the drain pipes without cutting huge slots in the tray above the firehole - which im not prepared to do. hopefully the pic shows the problem. the partly made valves wont get scrapped but will get modified for something else probably. anyway mark 3 version underway namely an ordinary 'aft' type blowdown valve but silver soldered to the bottom of the water gauge bottom fittings. and no need for 5/32 whitworth and L-H 5/32 whitworth threads either! cheers, julian
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Post by Roger on Aug 21, 2014 21:09:23 GMT
That's a pain. It's so easy to see once it's wrong, and not so easy when you're imagining it. Oh well...
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Post by Deleted on Aug 21, 2014 21:52:01 GMT
It's a very "traying time" indeed !!--------- Come on master craftsman, you can Engineer your way out of this one I'm sure !!
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dscott
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Post by dscott on Aug 22, 2014 9:21:47 GMT
I am not alone with the Terrier fire door flapping open inwards. Now I just dream of getting enough done to fire her up. For the valves I do them from an article Valves My Way, way back in the first few years of Engineering In Minature, and an idea from someone who ran every weekend with several locos. "Make all your valves the same, and have spares." David.
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