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Member postings for Doubletop

Here is a list of all the postings Doubletop has made in our forums. Click on a thread name to jump to the thread.

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Thread: Is anybody else building a Northumbrian??? (survey)
18/01/2012 19:56:49
Thanks for the heads up its 'in the post' as they say. should be here (NZ) in a few days
 
Pete
18/01/2012 08:17:34
Nice one Norm. Looks like a good start you've made there in one day. Are you doing a separate build log on any of the forums? It was the opportunity to try making a 'proper' boiler that made me start this.
 
regards
 
Pete
Thread: Northumbrian First run on steam
14/01/2012 21:06:33
Neil
 
Its gas fired. Easier and cleaner especially at this stage, it can be run, allowed to cool and be stripped down really quickly, and with the minimum of mess. I had the boiler out twice yesterday and its coming out again today.
 
Build log is here
 
http://www.homemodelenginemachinist.com/index.php?topic=15536.0
 
The burner is on page 4
 
Pete
 
 

14/01/2012 20:52:34
Thanks Jason, Brian, Norm
 
Still a bit of a way to go yet before its capable of pulling anything like a load. 80/20 comes to mind with these things, are they ever 'finished'?
 
Brian, I like that Betty of yours nice job, looking very clean and tidy. Was that recently built from scratch?
 
Thanks again
 
Pete
14/01/2012 04:48:41
I had originally come to this forum to ask if anybody had completed one of these and had managed to get it running. To date nobody seems to have posted a video anywhere. So here's my first run.
 

 
It took a few attempts to get it to run and as the boiler isn't certified yet (its been pressure tested) I wasn't going to go above 30psi. There's a bit of a knock that needs sorting and the burner isn't working as well as it should but its a start.
 
Pete

Edited By Doubletop on 14/01/2012 04:55:04

Thread: Northumbrian Super heated version - steam chests
14/01/2012 04:39:19
Having completed the plumbing I'd now suggest that the lubricator union goes outboard of the steam pipe elbow, otherwise the union just gets in the way.
 
Pete
Thread: Northumbrian Build thread for reference
01/01/2012 06:20:14
I've managed to make a bit of progress on my build over the Christmas break so done a few updates to the forum posts. I've also done the gas burner now, which may be of interest to some.
 

Pete
Thread: Northumbrian Super heated version - steam chests
27/12/2011 09:23:42
Once again the drawings in Model engineer are wrong and if you are making the super heated version of this loco to magazine articles you need to be aware. It isn't helped by the fact that dimensions are spread around various drawing published in different issues. If you make the chests in part 8 by the time you get to the lubricator plumbing in part 13 you'll be doing them again or adding the lubricator pluming differently.

The steam chest drawing (item 31) in Part 8 has a number of dimensions missing

1) thickness nears bolting face (with exhaust port) = 1/4"
2) width of cavity 9/16"
3 outside wall thickness 3/16"
4) centreline 17/32" from bolting face

Other hole locations are given in item 42 also in Part 8.

If you are doing the superheater version you can't put the inlet port on the center line. By the time you get to Item 100 in issue 13 the lubricator banjo mount is shown to 5/16" inboard of the the inlet port. If you drill the 3mm hole for the 4BA tap it will go right through the rear inboard stud hole. See attached pdf, I've moved the inlet port and lubricator banjo 1/16" outboard. The inlet doesn't need to be in line with the valve rod as it doesn't reach that far back on the rearward stroke.

 
Pete



Thread: Is anybody else building a Northumbrian??? (survey)
27/12/2011 09:13:06
Thanks for taking the time to reply everybody. Even with PeteH, in Oz who is making one that's still not many of us. Hopefully its because people are on holiday and not checking in.
 
I'm really looking for somebody who has had one in steam, even if it was a complete failure at least we'd all be aware of where we are heading with this. It's a bit of a worry when the original authors aren't coming forward on these discussion threads.
 
Anyway onwards and upwards, and thanks for your time.
 
Pete
Thread: Vertex HV4 Rotary Table
23/12/2011 09:51:14
I have one and use the weedy ledges with parts from one the the ubiquitous clamp kits you can get for milling machines.
 
I have added a register in the 10mm slot in the back so that it sits in the center T slot in my mill (that just happens to be 10mm) . I've just used a length of 10mm square ally bar and installed it extending over the edge so it can be used in both the horizontal and vertical orientations. It helps by getting the rotary table in the right place and stopping chasing it round the mill table when clamping it down.
 
So a a piece of ally 10mm x 10mm x 40mm and a 6mm cap screw and job done. Assuming you are using it on a mill you have the equipment to make it easily.
 
Pete
Thread: Is anybody else building a Northumbrian??? (survey)
23/12/2011 09:24:05
I had asked this question some time back but outside of this topic and it didn't elicit much by way of reply's. I know Jasonb has started and I think parked his project. PeteH in Oz is actively making one and I've got one underway. There are a few following these threads but it's not clear whether they are actively building or just interested.
 
Can we do a bit if a survey by replying to this thread?
 
1) Actively building - (please advise progress)
 
2) Started but put on hold
 
3) Started and given up - (reasons would be helpful, but I'm sure we could make a reasonable guess why you would have stopped)
 
4) Just an interested observer.
 
I'll start:
 
I'm actively building, have the chassis complete and running on air, boiler built and inspected, needs some minor re-work. Various ancillary parts made ready for plumbing up. Tender not started.
 
Pete
 
 
 
 
Thread: Northumbrian - Steam Chest Dimensions
21/11/2011 09:41:14
I've just been on the phone to Peter Harmon at GLR, about something else, and he gave me the dimensions 1/4", 9/16" and 3/16" . The valve width dimension is also 9/16" and the write up suggests something along the lines of "make the valve just under 9/16" implying the valve uses the steam chest sides as guide for the valve but elsewhere the writeup says that the gland nut acts as the guide.
 
That said, and as Joseph suggests, my casting will need to be machined bigger than 9/16" to be able to square up the cast aperture .
 
Pete
21/11/2011 07:26:12
Part 8, page 134 drawing 31 has the dimensions of the aperture missing.
 
I've scaled off the dimension that are provided, some of which are clearly drawn incorrectly (the 1/4" ends). Assuming a common fraction of an inch I make the missing dimensions around 17/64", 36/64" and 11/64". 36/64" is 9/16" and that's the width of the slide valve, which maybe what was intended?
 
Can anybody confirm please?
 
Pete
Thread: Northumbrian Cylinder Ports
09/11/2011 08:06:34
Jason
 
That did cross my mind, but you get the general idea.
 
I must do some more pics for the HMEM post, Things have moved on a bit since the last batch
 
Pete
09/11/2011 07:51:02
Well got home from work tonight and took the view stop messing and get on with it. So set the block at 27deg as planned and started on the exhaust port with a 1/8" slot drill. [Not end mill; I keep mixing up the terms because with a slot drill you use the end and with an end mill you use the side (more or less) .]
 
Anyway rather than then move to a drill I continued the hole with the slot drill as its stiffer and was going where I wanted it to. With a bit of fiddling about I got the exhaust port holes joined up.
 
I then moved to the inlet, rather than try and get the angles lined up for each port I did 2 x 3/32" holes 5/8" deep and .07" either side of the center line and 0.13" down from the port face parallel to the cylinder. They just come out into the bottom of the inlet port and I'll make the ports deeper to the bottom of the drill holes. On the cylinder ends I mill a 1/32" deep relief into the cylinder.
 
A few hold you breath moments just in case I'd missed something, but it came out fine.
 
Onwards and upwards.
 
Pete
09/11/2011 03:37:50
Thanks Jason I thought you may come up with the answer. My copy of this article is a bit poor as a result of the on-off availabity of pdf copies of the online versions of the magazine on MHS.
 
I'm going to use about 27deg and predrill with a 1/8" end mill to get face to work off, centre drill and then drill 2mm and then try to go up to 3.2mm
08/11/2011 20:07:18
Thanks for the replies everybody. This is for the "Northumbrian", silly me I posted it under the Northumbrain thread and then realised that information isn't carried through with the post. It was too last after I'd sent it and as far as I can see, unlike other forums there's no way to edit your post on this forum.
 
Its another area where the magaizine write up and drawings could have been better. Its taken a bit of interpretion to work out what was intended, reffering across a number of issues. This bit is just gobbledy gook, and you can imaging getting to this point on the cylinders theres a reluctance to stuff it up.
 
Pete
08/11/2011 07:22:15
Can anybody help decode this part of the instructions please regarding the drilling of the passage from the exhaust port to the exhaust passages
 
"Now consider the angle necessary for drilling through the floor of the exhaust port to meet up with these two holes. The starting point for drill will be about 1/16" from the bolting face, and the port face will be roughly 10deg. from the vertical.".......
Start with say a 1/8" drill, on the center line of the port........"
 
"drilling through the floor of the exhaust port to meet up with these two holes" so we start in the exhaust port.
 
The starting point for drill will be about 1/16" from the bolting face, Where on earth is this point? the closest edge floor of the exhaust port is 3/8" from the bolting face.
 
and the port face will be roughly 10deg. from the vertical."....... Start with say a 1/8" drill, on the center line of the port . A 1/8" drill at with the job 10deg from the vertical will rip into the outer edge of the port.
 
I've drawn it up and the shallowest angle looks to be around 25deg and eve that looks too shallow. I've sketched up this to demonstrate. the drill is at about 25deg


Any clues?
 
Pete
 

 
Thread: Northumbrian Build thread for reference
18/10/2011 02:37:05
Thanks Jason.
 
I've just been getting on with it so not come back over here to check any postings. A bit ironic really that my original post over here was to find out if anybody had built one of these to find my thread being used as a reference.
 
I'd better get some more pictures done and update the HMEM thread.
 
Pete
Thread: Digital Issues
28/08/2011 09:12:18
Have the .pdfs gone AWOL again? One minute they are there then they're not.
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