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Member postings for AndyP

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

Thread: MEW, would less be more?
03/12/2011 14:25:05
There is a full index of MEW here and also one on Harold Hall's most excellent site here
Thread: Stationary Engine for Beginner
02/12/2011 22:35:57
Handmaiden was Tubal Cain's build of the Stuart 10H using only hand tools, he altered the crosshead and slidebars to facilitate this and some would say improved the looks in so doing. The series started in ME vol 148 June 1982 and continued in alternate issues through most of vol 149.
Thread: Where's my thread
18/11/2011 12:07:54
You could try posting a request in the Trade section here, there are several members there who are capable and could be interested.
Cheers, Andy
Thread: Specifications for 3 1/2" Gauge
10/11/2011 00:16:10
I have added some photos in an album called 3 1/2" electric.
What you can't see is that the motor/gearbox assembly is mounted to a stretcher via a paxolin ? sheet that flexes to give suspension movement.
The speed contoller is mounted in the body - sort of in the top of the bonnet and the battery in the cab - hence the wheelies.
My grandchildren love it but since they are both girls I am having to resist painting it pink
09/11/2011 13:16:54
I geared my 3 1/2" electric for about 5mph which can keep up on the track but the 4 year old complains it isn't fast enough - the throttle might as well be a switch for her though!
There are wheel standards here as well as lots of other really good stuff.
On working leaf springs I have 3/16" travel from rest position so around 3/8" overall and it hasn't derailed since I added several pound os lead behind the front buffer beam to remove the tendency to pull wheelies.
My coupling hook is 1/8" thick but the working coupling is a clevis and pin 3/16" bar and 1/4" respectively.
Some clubs insist on safety chains, mine doesn't despite one of the guys having to rugby tackle a runaway 3 1/2" Brit a few years ago.
Cheers, Andy
Thread: Near Scale Diesel Hydraulic Shunter
22/10/2011 13:38:59
I built a 3 1/2" gauge electric for the grandchildren to play with but it will drag my 18 stone round the club track.
2 1/2" wheels, 18 kilos all up, outside frames, single 120w motor, gearbox using hand drill bevel gears driving one axle and coupling rods. 12 ah sealed battery and simple non-reversing controller, reverse is via a dpdt switch on loco (4 year old likes throwing that at full speed !)
Far more fun than it should be.

Edited By AndyP on 22/10/2011 13:58:03

Thread: Post-build review reveals one major defect (incompetence)
18/10/2011 15:47:24
I don't have a DRO but the suite of Model Engineers' Utilities by Alan J. Munday has a calculator for pcd co-ordinates and lots of other useful stuff, I can't remember (typical) where I downloaded it from but am sure Google (other search engines are available) can find it.
Thread: Help with a 'beehive' spring.
16/10/2011 00:00:26
Anything on here of any use - made sense to me!
Thread: machining conn./coupling rod ends.
13/10/2011 00:01:59
I like filing buttons for that sort of job, as described in hint no7 here
Our club loco is an Achilles - absolute cracker!
Thread: How to read paln
29/09/2011 13:49:53
From The Model Engineer's Handbook root radius for the relevant gauges is given as:-
Gauge RR
63.5 0.9
89 1.3
127 1.8
184 2.5
all dimensions in mm of course.
Thread: silver solder
18/09/2011 23:01:11
Well with scrap sterling silver currently making £668 per kilo 1/2 kilo of easyflo which is 50% silver contains about £170 worth of silver so if it is easyflo bargain is the right word, I'll take 20 reels please.
Thread: Don Young's 'Alice'
09/09/2011 14:32:40
I have always "known" Don's Hunslet to be 2 1/2" to 1 foot scale and have had completed frames and cylinders seasoning under the bench for far too long so you got me wondering. Correct, the drawings do not say. In the LLAS articles Don states that the scale is 2 1/2 times that used for a standard gauge prototype.
The frames are 2' 4 3/16" giving an overall length of around 2' 10" so comparing that to Maxitrak's Hunslet which is 2" scale and 2' 1 1/2" overall tends to support 2 1/2" scale.
I don't have any prototype dimensions to hand.
Found some - Holy War's wheelbase is 39" which equates exactly to Don's Hunslet of 8 1/8" at 2 1/2" scale - conclusive enough for me.
Cheers, Andy

Edited By AndyP on 09/09/2011 14:50:28

Thread: Pinning
26/08/2011 10:36:22
I will speak up for tapered pins as well, just don't mix up metric and imperial - the tapers are subtly different. My tapered reamers came from Tracy Tools.
Thread: Nemmet which mag' Issues?
03/08/2011 11:44:56
The 15S articles started in 4271 and continued in alternate issues as David has said.
I use the ME index downloadable from here and a quick search under Nemett shows you may find the intervening even numbered issues uesful as they include some drawing corrections and letters pertaining to that model.
Cheers, Andy
Thread: Proxxon machine tools
19/07/2011 23:37:28
Michael, I'll try but I don't have an engineering background, well not this sort of engineering anyway.
The saddle is very short so even with the gibs adjusted as tight as possible while allowing movement there is still detectable play - think rotary looking vertically down on the saddle.
There is simple backlash adjustment for the leadscrew but it soon reappears, likewise for the saddle traverse, mind you backlash can be allowed for by working methods - I have learnt something at least.
It doesn't compare in any way with the Cowells for "feel" - I can't put it any better than that.
For the size of component you are working on the Proxxon may be a better bet - but I have never seen one.
Variable speed is great though
It strikes me you are down to watchmakers sizes so maybe consider that category of machine - price a big issue again I suspect.
Hope my ramblings help a little.
Thread: New lathe help
19/07/2011 10:27:26
Don't discount the Boxfords, my AUD projects 18" from the wall, 2 way power feeds, screwcutting gearbox and plenty rigid enough for me so far. You could find a decent one privately in that price range - I did and with 4 jaw, steadies, boring table, imperial conversion gears included.
Cheers, Andy
Thread: Proxxon machine tools
19/07/2011 10:21:32
My first lathe, 5 years ago, was a Sieg C1 but the Chester variety. I have built most of a 3 1/2" gauge Rob Roy on it so far and a lot of little bits for other jobs.
It is not the most rigid or accurate lathe and the topslide is a pita.
I now have a Cowells and a Boxford AUD as well and still use the C1 for anything that will fit on it and doesn't need high accuracy, it is so quick to set up and quiet in operation. It helps that I have just about every extra available - I could never afford them for the Cowells.
Cheers, Andy
Thread: Case Hardening - can't even harden a washer !
29/06/2011 12:04:55
28/06/2011 22:35:45
I have a tin of case hardening powder bought from Blackgates at a show in the last 3 or so years, it behaves like the "sticky" variety described here and everything I have done with it has been hard - no connection etc.
Thread: Technical and engineering drawing.
17/04/2011 23:50:34
Excellent idea that I would find very useful. I have only been at this for 5 years so count myself as a beginner, got as far as an air running Rob Roy, sometimes despite the "words and music".
First and third angle projection has never been intuitive to me having a background in civil engineering.
If the article covered the styles of some of the major contributors in the past that would be great.
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