Member postings for David Haynes

Thanks folks. John, do you have a prefered supplier for PEEK?

Dave

I felt a bit disappointed that the PTFE die blocks that I used will have to be replaced before doing any useful service. The pin that goes through the block into the radius rod yoke has created an oval hole and this will affect the timing. I think the problem is the small dimensions of pin and block; a 3/32" pin through a 3/16" wide x 1/4" long x 1/8" thick block. Nice idea if it worked. Back to the steel.

Any thoughts?

Dave

Hi All,

Stewart, there are various things that may effect binding of wheels, to some extent or another. Working by a process of elimination to identify the fault applies to all the construction process, if you have any faults that is. Assuming that the chassis rolls happily down a piece of inclined track before the coupling rods are fitted, then the following may be a cause: -

- Coupling rod centres not the same length as the wheel centres (the wheel centres may differ from as the drawn dimension and between left and right side of the loco);

- Wheels not quartered correctly;

- Crank pins not perpendicular to the plane of the coupling rods;

- Coupling rod bushes not bored perpendicular to plane of coupling rods.

All the best,

Dave

Edited By David Haynes on 16/03/2014 21:50:21

Edited By David Haynes on 16/03/2014 21:51:33

Like many others, I too was saddened to hear of Peter's passing. He is one of those contributors whose writing I would like to see gathered in a book, pan pipes and all.

Thanks Julian.

Dave

Tich, small as it is, has been a battlefield for many, and l sadly there are many partial builds for sale left as casualties. There are various obvious pinch points which scare off folk. Well done for having a go and I hope you are able to complete it in a good time.

This is the buffer detail on L&HR Barclay 2333 "David". Nuts on the outside and lock nuts for good measure!

But this is the detail on the LHR Hunslet Austerity 'Cumbria', with bolt heads on the outside...

Some more for Neil's survey,

only another 493 to go... 

Dave

Edited By David Haynes on 27/10/2013 00:05:27

Edited By David Haynes on 27/10/2013 00:12:27

Hi folks,

Can anyone point me in the direction of a design for hydrostatic/sight feed lubricator in 3/4" scale. Those that can be bought or have been described all seem to be for at least 5" gauge locos (or 3 1/2" narrow gauge). I know in principal it is an oil box with screw lid and in/out feed pipes and valves, but this is too simplistic and I don't want to try and reinvent the wheel.

Thanks, Dave

Thanks for that Nick. I am a subscriber to ME and I know David Clark mentioned about these sheets being available as PDF downloads. As I would like to get copies of the sheets, I wondered if this download applies to ME subscribers, or do I need to get MES 203?

Can someone point me in the direction of longer, 1 1/4" (& 1 1/2" x 1/8", copper rivets for the top stays in a Belpaire firebox. I know that PB could be used, but I would have to form a head at the inside end (using a nut) and that is already there with a rivet.

Thanks

Dave

What issue of MEW are these charts published in?

Dave

There are quite a few edge finders on the market, many include centre finders. Does anyone have any favourites or recomendations? I currently use a feeler gauge and a bar in the mill chuck/collet with a bit of maths, but sometimes this is fiddly.

Thanks,

Dave

Hi David,

I thought that it would prevent missing information if you copied the headings of your proposed chart to the ME forum before you printed the chart. Please ignore my comment about using 'paste special', I was not thinking straight - not relevant.

The list so far seems to consist of (with extras I have added):

chart is planned as separate A4 panels

Metric to IMP conversion. SWG sizes and conversions

Drills: letters / nos./ fractions / metric.

Threads: BA / 32T / 40T / Brass26T / Gas / Metric (Fine or Fine and Coarse??)

(maybe also BSF / BSW).

Possibly also TPI of BA

Tapping (for strong & weak threads - % depth of thread) and clearance drill sizes

Machine cutting speed for different materials and diameters

Regards

David

Hi David,

This idea of your seems to have been a winner. Just one thought, perhaps before you put ink to paper, you give a list of the items to be included. Not a finished format, just a paragraph that you copied from your proposed chart and 'paste special - unformated text' into a paragraph.

It would be a shame for something to be missed when there is such a forum of MEs.

David

Thanks David for the suggestion, that would be a good idea to put that in - I subscribe to ME but not MEW.

Dave Haynes

There are many ME material suppliers that we use but I am looking for a particular one who, amongst their stock sells very small sections, in this case, 1/4" x 1/4" x 1/32" angle. I was given a small A5 catalogue for a firm, I think in South Wales or the West Country, but I have since mislaid it and would like to find out who the firm is to get another copy. Any ideas?

Thanks, Dave.

Who has tried teflon tape?

Dave

A lot of folks have already made there thoughts known about preferring O-rings and the need for a nip in the fit. But, if I want to use graphite yarn, poking it in to the gap with a blunt knife etc, does anyone have a favoured technique for doing this? I end up packing it and then shaving some of the bulge off with a knife, as it won't fit in the cylinder otherwise (even though the correct 'nominal' size was used for the groove).

Not much has been expanded on PTFE tape, how successful is this as cylinder packing?

Dave

Hi folks,

What thoughts do people have about mechanical lubricators for 3 1/2" gauge? LBSC's is well tested, but some complain about it issuing too much oil. Martin Evans did one for Rob Roy which I have good things about. Both have been taken on into new loco designs, but what others are liked?

Dave

Okay, so the boring tool has been passed through several times without altering the cross slide, but LBSC does not go on to recommend lapping in order to remove the tiny undulations that may be present along the length of the bore. Is this because they will be taken up by the piston packing?

Dave

Hi Folks,

I am interested to know what people favour for fitting of an exhaust outlet in the top of the steam chest when cylinders are between the frames. The system I have in mind at the moment, is where a hollow 'exhaust fitting' sits between the valves in the middle of the steam chest. The bottom end of this fitting is screwed home in the exhaust port in the top of the cylinder block. The threaded upper end of the fitting protrudes by about 1/2" from the top of the steam chest cover. The hole in the steam chest is clearance only and is not threaded. On top of this, a threaded 'exhaust flange' is screwed home over the end of the exhaust fitting, seated on joint sealant, and the fixing completed by fixing this flange to the top of the steam chest cover with a 6BA screw. The blast pipe can then be screwed over the remaining protruding thread.

Fixing the steam pipe is simpler as there is not the issue of multiple seals; a simple threaded hole in the top of the steam chest cover and the usual union to the steam pipe.

I would be grateful for your thoughts; do you have better ways of doing fixing the exhaust pipe?

Many thanks,
Dave