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Member postings for geoff walker 1

Here is a list of all the postings geoff walker 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: small cast iron flywheel
18/09/2018 18:00:56

I need a 100mm dia flywheel for my next engine.

The one supplied by ATELIER looks more or less just what I need.

Could I ask does anyone have experience of Atelier flywheels, usual disclaimer of course.

It's not a cheap flywheel but I don't mind the cost as long as the product is good.

Any comments appreciated

Geoff

Thread: Chester Champion V 16 Z axis mod
18/09/2018 17:31:52

Nice work David, is it your own design?

Looking forward to seeing it completed.

A you tube video of it in use would be a good idea.

Geoff

Thread: The Workshop Progress thread 2018
18/09/2018 17:27:30

Yes, very nice, as someone once said it's amazing what you find inside a big chunk of cast iron.

Hope you had a good clean up Brian!!!!

Geoff

Thread: Cleaning castings by hand
18/09/2018 15:31:03

Looks good to me Gary.

I like your approach, nothing wrong with adapting current equipment to meet an immediate need.

The problem is that it is very time consuming.

Sooner or later you may feel the need "to get on with things" and will need then need to expand your workshop equipment.

Geoff

Thread: The Workshop Progress thread 2018
12/09/2018 15:06:37

Nice work Jim, looking good.

Are those just very short studs in the cylinder end or are they extended into the cylinder wall thickness?

Keep the pics coming and can you put 6" rule in the pics so I get an idea of the scale.

ATB Geoff

Thread: WT2527 15cc Glow Engine
10/09/2018 09:15:46

Agree with everyone, great craftsmanship. You appear to have a very wide range of skills, the spitfire looks superb. Keep posting Craig, really interesting topic.

If I was betting man I'd say you probably laid that patio as well......?

Geoff

Thread: What did you do Today 2018
06/09/2018 13:25:38

20180905_143510.jpgCurrently making another Muncaster engine so I thought I would also make the simple reversing valve detailed in the 1912 book. Works well and will be incorporated into the new engine. Also gave me a chance to try out my "new toy".

Many of you will recognise the small circular table, sold by RDG which was great for the semi circular curves in the valve head.

Some feedback on the table. It's very small, 2 1/2" table diameter so only good for small scale modelling but is well made and I think good value.

Geoff20180905_143457 (2).jpg20180906_123533.jpg

Thread: double acting oscillating cylinder engine
23/08/2018 18:21:23

Hi Thor,

Thank you for the reply, some good advice.

I find the issue of which materials to use confusing and would expect people to have different viewpoints largely based on their own experience.

My experience is limited to two engines both of which had a cast iron cylinder and a gun metal piston. they have both worked well and my thoughts were that you could pair them the other way round, gun metal cylinder and cast iron piston, but I don't really know whether that is practical.

I feel I should point out that the well made parts in the photo are not mine, they are Jason's work from his new year oscillator

thanks again Geoff

23/08/2018 15:10:51

Hi All

My next steam engine will be a simple double acting oscillator, 5/8" bore 1" stroke.

I want to fabricate the cylinder in much the same way as Jason did in his new year oscillator by silver soldering the parts together. see photo below.

M Machine metals have LG2 gun metal in hollow and solid round, a material which I would favour for most of the fabrication. no particular reason I just like the material and as it is used a extensively for cylinders thought I would give it a try.

I assume gun metal ok for silver soldering, if so what grade of solder?

The piston material, cast iron? phosphor bronze? aluminium alloy? gun metal?

Any thoughts/comments as ever would be welcome.

thanks Geoff

jason cylinder.jpg

Thread: Murray's Hypocycloidal Engine - Antony Mount
05/08/2018 13:21:24

Nice work Mick, been a good thread this some interesting input

Geoff

Thread: The Workshop Progress thread 2018
30/07/2018 13:11:12

Another sumptuous example of craftsmanship Jason, well done

Like many others I envy not just your talent but the efficiency with which you turn out these lovely models.

Geoff

Thread: What did you do Today 2018
25/07/2018 07:10:55

Yes definitely looks good Nigel, coming on nicely, keep posting, will be interesting to see the finished item.

Geoff

Thread: Rotary table suggestions for Myford vertical slide
23/07/2018 20:23:16

Hi All,

First of all could I say that I have read through the posts on this thread.

Could I ask does anyone have any experience of the small table offered by RDG. the one with the cream base and a 2 3/4" table.

It looks like it may well serve my purposes, very light milling from the head stock using the vertical slide and the same with my potts attachment set up over the lathe cross slide.

Geoff

Thread: The Workshop Progress thread 2018
22/07/2018 11:04:02

Hi Jim, Jason,

Thanks for your comments.

I have prepared a detailed CAD/PDF drawing of the engine to my sizes. Much the same as the Muncaster/Westbury I've just "beefed it up a little",

Anyone who would like a copy P.M. me and I'll get one to you.

Geoff

21/07/2018 18:33:46

Looks a good choice to me Jim, keep us posted.

Here is my recently completed mini muncaster oscillator. Really enjoyed this build.

Here is a picture. The sizes are much the same as the principle Muncaster/ Westbury sizes

Video on you tube if you want to see it working. Sorry I'm thick when it comes to loading you tube videos,

perhaps Jason will oblige. Geoff

20180721_130114.jpg

Edited By JasonB on 21/07/2018 19:17:33

Thread: ME Vertical Boiler & Hand Pump
14/07/2018 12:58:55

Good news for all who are interested in making the M.E. boiler.

M.G. has now completed the articles on the hand pump and will commence the boiler build next month.

Also it will feature every two weeks instead of every month.

I hope M.G. includes a full detailed drawing of the boiler at an early stage so builders can see the whole picture before he starts his constructional series.

Geoff

Thread: Really hope this finds a home....
03/07/2018 13:36:30

Location, location, location.

Probably will find a buyer but the location will deter many, long drive down to the west country.

If it was in the north west, midlands, home counties there would be a lot of interest.

Nice lathe I'd find room for it but too far away, a shame.

Thread: The Workshop Progress thread 2018
30/06/2018 14:29:04

Could I ask a general question here.

A lot of "older" designs have a crank arm which is very simple and not balanced with a web the opposite side to the crank pin.

Why is that, do some engines just not need it?

Geoff

I think that model engines at this scale running at representative speeds don't need balancing weights on the crank. However, for appearance sake sometimes they are included.

Thanks for your reply Jim. From what I have observed I get the impression that the longer stroke engines with a larger flywheel and a slower speed are less in need of a balanced crank than a high speed short stroke engine.

The Muncaster I am currently making (slowly) has an unbalanced crank, large flywheel and a long stroke. I'll try it and see how it runs.

Thanks again Geoff

29/06/2018 19:55:39

Yes, very nice George.

Do you run on steam or compressed air.

Could I ask a general question here.

A lot of "older" designs have a crank arm which is very simple and not balanced with a web the opposite side to the crank pin.

Why is that, do some engines just not need it?

Geoff

24/06/2018 12:28:09

Hi Jim,

To achieve the distinctly non prototypical polished rim on cast iron flywheels, after machining them to size and painting them, I mount them on a mandrel the same diameter as the crankshaft and chuck them up in a 3 jaw chuck on the lathe. Then it's a matter of turning it at a slowish speed (250 - 300 RPM ) and using a file and then progressively finer grades of abrasive paper until a smooth finish is obtained and finally finishing off on a buffing wheel.

Yes this method was great Jim. I've just done a stuart flywheel finishing with 1200 grade wet or dry using light oil as a lubricant.

A final buff and it's come up a treat.

cheers Geoff

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