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Member postings for John Baguley

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

Thread: What did you do today (2015)
11/01/2015 21:40:54

They sound the same design as the doors in my 1930s house Neil. They and all the woodwork were also painted with some sort of varnish that took ages to get off with a hot air gun and scraper as it went like chewing gum. Next doors had theirs stripped but it did affect the glued joints as well.

John

Thread: South African Locomotives works drawings.
10/01/2015 13:20:35

I received my copies this morning. Last day for ordering is now the 31st of January so get in there!

John

Thread: 3D printing seems to have gone quiet. Where are we all at?
09/01/2015 14:03:56

That would probably work but I think the printing speeds would have to be very low due to the large mass of the components in a milling machine compared to a dedicated 3D printer?

John

09/01/2015 12:10:37

Having spent a lot of time reading forums etc. about printing and the various printers, the 'hobby' class printers seem to be let down by using cheap inferior components in the gantry systems i.e the rods, bearings and pulleys. That was certainly the case with the Wanhao that I bought and the Ultimakers etc. have the same problems. These printers are built to as low a cost as possible to make the prices attractive and inevitably corners are cut.

I replaced all the rods on the Wanhao as they were either undersize or slightly bent and also the two linear bearings that the print head slides on. Before, the head could rock from side to side which wouldn't help the accuracy of the prints. It's now rock steady and much improved. If you have to go down this route and go for the cheaper chinese linear bearings, buy at least twice as many as you need as you'll find all the fits will be different!

Fortunately, the mods to mine didn't cost that much compared to the cost of the printer and I expected to have to do some work on it myself anyway.

On the whole, the surface finish from the Wanhao is superb, much better than prints from most other 'hobby' machines that I've seen. I've used about 1 ½ rolls of filament so far and never had a failed print so long as the bed levelling is correct. I can happilly just set it going and leave it to it's own devices and often leave it printing overnight.

I still haven't got to the bottom of the problem with spoked wheels though, where the finish on the spokes is not as good as the hub and rim. It's really bugging me! There's no problem at all with solid objects.

John

Edited By John Baguley on 09/01/2015 12:12:05

Thread: inverter installation on ML7
07/01/2015 17:20:02

I just screwed mine to the wall behind the lathe so it was out of the way of chips and any spray from suds when I do use them.

complete.jpg

John

Edited By John Baguley on 07/01/2015 17:20:43

Thread: Horwich Crab Boiler
07/01/2015 10:13:53

Hi Keith,

Haven't built one so can't help with the blast nozzle size but the elbows are indeed connections for a condensate drain valve. They are piped to a valve mounted behind the rear cylinder drain cock and operated by the same linkage.Details are shown on sheet 8 of the drawings (bottom right).

John

Thread: Latest boiler regs?
05/01/2015 11:12:25

There's still nothing in the regs that covers an external steam pipe, even if the safety valve is fed from that pipe. The inspector presumably assumes that a 1/4" pipe is not adequate to relieve the pressure via the safety valve. That can easily be determined by the steam test. If the inside diameter of the pipe is equal to or greater than the diameter of the seat in the safety valve then it should be fine. If the boiler passes the accumulation test and the pressure doesn't rise above 10% of the working pressure (50psi?) with the burner on full then there shouldn't be a problem.

At the end of the day though you have to satisfy the inspector (even if he is wrong!) if you want the boiler tested. I'm sure it's no big deal to increase the diameter of the pipe if that will make him happy.

John

04/01/2015 21:07:26

George, what the inspector told your mate is a load of rubbish. The steam piping is external to the boiler and not covered by the regs.

John

Thread: Brake shoe radius
03/01/2015 20:51:37

Don't forget that the machined surface of the shoes needs to match the taper on the wheel tread, otherwise the shoes will not sit square when the brakes are applied.

John

Thread: boiler material
31/12/2014 21:16:51
Posted by Neil Wyatt on 31/12/2014 20:49:30:

What we need are small carbide-tipped robots that burrow into a solid steel bar and hollow out a boiler. I

Neil

That reminds me of a Chuck cartoon in an old ME where he machines a boiler out of the solid!

John

Thread: 3D printing seems to have gone quiet. Where are we all at?
26/12/2014 16:39:32

Mine will be used for sand casting as well. It is possible to use patterns made from PLA in 'lost' PLA casting where the pattern is used directly and burnt out by the molten metal, as in lost foam casting. The cost of the material is so cheap that that becomes a viable proposition.

I've no doubt I will find many other uses for the printer once I get into it. I'm already thinking about printed tool racks for the workshop!

I printed out some squares today and found that the corners were not all at 90° so it seems the X and Y axes were not correctly aligned. A quick check confirmed this. I've realigned them now and there seems to be a definite improvement in the finish on the spokes smiley

spoked wheel 2.jpg

I'm aiming to print with 0.05mm layers reliably. Although there is little noticeable difference on the finish between 0.05 and 0.1mm layers on a vertical surface, it makes a big difference on a curved surface. Each layer produces a very visible step in the curve and the smaller the layers, the smaller and less noticeable the steps.

John

Edited By John Baguley on 26/12/2014 16:56:24

26/12/2014 11:06:18

So far I've found the general surface finish with the Wanhao to be really good, much better than I expected. I am having an issue with it though in that the surface finish is not consistent. When I print out a spoked wheel pattern the finish on the rim is excellent but the finish on the spokes is not as good, as if the layers don't quite line up properly. Haven't sussed out why yet.

test print - spoked wheel.jpg

I've rebuilt the gantry of the printer with better quality rods and bearings which has helped ( some of the original rods were slightly bent and the bearings a poor fit) but the problem is still there. I'll get it sorted though. I wasn't expecting the printer to be good enough for what I want straight out of the box but to be fair it was pretty good.

John

Thread: SAR locomotive drawings - the whole caboodle
26/12/2014 10:43:02

Ordered a set yesterday as a Xmas present to myself. Works out at £68.37 in UK money for the drawings for over 90 locos and several books.

I bought the set for the 25NC a few years back and they are excellent quality containing the original scans (over 500 drawings) , a pdf version, and some CAD drawings as well.

John

Edited By John Baguley on 26/12/2014 10:45:51

Thread: Denham Junior serial numbers
23/12/2014 16:30:46

I used my Denham last week to finish turning the treads on some wheels for a 7.25" B1 for a chap at our club. I thought it would be a doddle but couldn't avoid chatter when turning the flange. I finished up having to turn the faceplate by hand to get a decent finish. Maybe the 30 rpm bottom speed wasn't slow enough for this job or there may be a bit of play in the two big angular contact ball bearings at the chuck end of the spindle. I changed all the other bearings in the head when I rebuilt it but these two seemed ok. At 3.5" od I think it would probably cost an arm and a leg to replace them!

John

Thread: Regulater for black 5
21/12/2014 13:24:09

Hi Ron,

Not used one myself yet but people seem to have good success with them. The only thing is that you need one that will withstand the temperatures. If it's going in the boiler it needs to be able to withstand at least 160/170 °C and maybe 200°C if fitted in the smokebox. An ordinary gas valve may not be rated for such high temperatures as the seals may be a low melting point plastic (could be wrong though). I think the higher temperature ones may have PTFE or metal seals.

John

Edited By John Baguley on 21/12/2014 13:31:22

Thread: Citric acid or sulfuric acid
10/12/2014 17:18:10

I much prefer sulphuric acid as I do find it does a better job and quicker. I do use citric as well though but mainly for cleaning injectors and fittings.

John

Thread: cylinder angle
01/12/2014 10:31:17

Certainly in the case of the 'Crabs' the inclination of the cylinders was purely to avoid clearance problems with lineside objects such as platform edges. They had a relatively low pressure boiler (180psi) and had large diameter cylinders to compensate for this.

John

Thread: Anyone got ME Vol 41, November 1919?
28/11/2014 12:02:15

Ok, on it's way.

John

28/11/2014 11:31:53

Hi Diane,

Yes, I've got it. I can scan and email it to you if that would help.

John

Thread: 3D printing seems to have gone quiet. Where are we all at?
10/11/2014 15:46:55

After looking around for the last few weeks I bit the bullet and ordered one of these:

**LINK**

Looks pretty good to me for the price. All metal construction and looks very sturdy. I would have liked an Ultimaker 2 as they have a very good reputation but it was out of my price range.

The main use will be printing patterns for castings but no doubt I'll find plenty of other uses for it.

It arrives tomorrow so we'll see smiley

John

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