Search found 25 matches

by jma1009
Mon Sep 04, 2017 5:27 am
Forum: Live Steam
Topic: Injector
Replies: 58
Views: 6067

Re: Injector

Hi Greg, Your pic of your 'D' bit 9 degrees tapered reamer looks to be considerably greater in degrees than 9. What is the OD and what length is the taper? I have not found any engraving bits of small enough taper but I do use them sometimes to remove some of the metal before using my injector reame...
by jma1009
Thu Aug 31, 2017 7:00 am
Forum: Live Steam
Topic: Injector
Replies: 58
Views: 6067

Re: Injector

Hi Greg, I would not advise making the injector cones out of stainless. In any event it is unnecessary. Your 'large' size injector required will have much thicker walls to the steam cone nozzle than those for 'small' injectors. If you are worried about Bill's "wear" comments, simply make a few spare...
by jma1009
Tue Aug 29, 2017 5:51 am
Forum: Live Steam
Topic: Injector
Replies: 58
Views: 6067

Re: Injector

Hi Greg, Have you bought yet the book by D.A.G. Brown? It really is a 'must have'. His book has the drawings for an injector that will be of a suitable large size for your loco, and a 'large' injector is easier to make than a 'small' one. Making what I will term 'UK' type miniature injectors is not ...
by jma1009
Tue Jul 04, 2017 5:26 am
Forum: Live Steam
Topic: Building a Power Model Water Pump
Replies: 100
Views: 16174

Re: Building a Power Model Water Pump

Hi John, The pic of your injector posted on 21st June is a gunmetal casting with 'KB' on the left hand side. They were sold by Kennion Brothers of Hertfordshire UK from the mid 1950s till around 1980. They were made by Arthur Grimmett of the Isle of Wight, who also supplied injectors to Reeves in Bi...
by jma1009
Tue Apr 11, 2017 3:31 am
Forum: Build Log
Topic: 7 1/2 gauge 4" Hunslet build, Reeves castings
Replies: 18
Views: 3657

Re: 7 1/2 gauge 4" Hunslet build, Reeves castings

Hi Lucius, It is a bit too late now, but the 3" scale Quarry Hunslet in 7.25"g marketed by Reeves in the UK is a far superior design when compared to the Milner design you are using. You have arleady noted various problems so far. When you get to the valve gear and cylinders and those dreadful circu...
by jma1009
Fri Jan 27, 2017 5:23 am
Forum: Live Steam
Topic: Lyndam 2 1/2"
Replies: 14
Views: 1744

Re: Lyndam 2 1/2"

Hi ChipsAhoy, Your picture is of Talyllyn Railway No.6 'Douglas'. Built by Andrew Barclay and Co Quite a few fullsize examples were built to this design. The other pictures are not the loco you depicted and are mainly a UK miniature design and variants called 'Sweet Pea' marketed by Blackgates in th...
by jma1009
Sun Aug 07, 2016 4:41 am
Forum: Live Steam
Topic: Hunslet draughting issues
Replies: 82
Views: 7247

Re: Hunslet draughting issues

Hi Bryce, I dont think Fred needs an in depth scientific analysis of the various merits or otherwise of the available options. He just wants some help getting the draughting better on his lovely Hunslet loco. We can always re-open the other thread for such discussion. It is after all not a USA desig...
by jma1009
Thu Aug 04, 2016 3:20 pm
Forum: Live Steam
Topic: Hunslet draughting issues
Replies: 82
Views: 7247

Re: Hunslet draughting issues

Hi Bryce, You really ought to read all the available UK Rugby Test reports of British Railways of the late 1940s and 1950s. These were mostly draughting tests under the watch of Sam Ell. These were tests on fullsize locos. They surpass Goss and Young in the USA by a considerable margin. If you have ...
by jma1009
Wed Aug 03, 2016 5:24 pm
Forum: Live Steam
Topic: Hunslet draughting issues
Replies: 82
Views: 7247

Re: Hunslet draughting issues

Hi Fred, Your alteration looks very good and an improvement on the two previous drawings. As long as you keep to the Jos Koopmans proportions I detailed a week or so ago for distance to choke from blast nozzle top, and diameter of choke, and with an enlarged blast nozzle, you should have a significa...
by jma1009
Tue Aug 02, 2016 5:45 pm
Forum: Live Steam
Topic: Hunslet draughting issues
Replies: 82
Views: 7247

Re: Hunslet draughting issues

Hi Bryce, Please do not dismiss your European cousins. The GWR used Goss in Churchward's time on the GWR post 1904 with significant experimentation and fine tuning for a set of standard smokebox draughting arrangements. Sam Ell, perhaps the cleverest man employed by the old GWR apart from Willie Pea...
by jma1009
Thu Jul 28, 2016 6:02 pm
Forum: Live Steam
Topic: Air Compressor Governor
Replies: 32
Views: 3250

Re: Air Compressor Governor

Hi daves1459, All you need is what is called in the UK a 'limit valve' set to release if air pressure from the pump gets above the required pressure. With air it will be the otherway round to the limit valves used in miniature on vacuum brake equipment which is pretty much standard in the UK in 7.25...
by jma1009
Tue Jul 19, 2016 7:00 pm
Forum: Live Steam
Topic: Hunslet draughting issues
Replies: 82
Views: 7247

Re: Hunslet draughting issues

Unfortunately James you have probably confused matters! One must be rather wary of one person's magic results when applying it to other different locos. UK ME magazine is littered with such magic solutions! All fail to meet the fundamentals. Jos has shown how the chimney performs quite differently t...