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David Fletcher
Railway Exec (Moderator)
1st Class Member
Australia
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SteveC
Engineer
1st Class Member
USA
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 Posted - 03 Aug 2004 : 17:57:10
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A Big thank you to you both Jens and Fletch.
Jens, interesting technique on making the journal box lids, simplify, simplify, simplify. 
Have a GREAT day.
SteveC |
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Wayne Spence
Foreman
1st Class Member
Australia
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Posted - 03 Aug 2004 : 18:25:32
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G'day Jens
First of all,thanks for taking the time to produce this article on scratchbuilding the MS rear truck.
The PDF's printed out just fine and the photos will be most helpfull to those modellers who choose to build their own truck.
Just one question, how do you manage to cut 2mm styrene to these exact fine cuts and get all the edges square?
Was the first pattern cut oversized and then machined down to the required shape?
Getting small square holes cut in 2mm styrene can be a pain.
Excellent work Jens. |
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SP 1
Brakeman
Germany
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Posted - 04 Aug 2004 : 00:00:11
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quote:
Originally posted by Wayne Spence
Was the first pattern cut oversized and then machined down to the required shape?
Getting small square holes cut in 2mm styrene can be a pain.
Wayne, what part do you mean?
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Jens,
Germany
aka SP 1
Edited by - SP 1 on 04 Aug 2004 10:24:50 |
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East Broad Top
Railway Exec (Moderator)
1st Class Member
USA
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Posted - 04 Aug 2004 : 08:42:40
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That was my question, too. That's some very fine, very controlled cutting you're doing with that styrene. Obviously you're not using an X-acto knife. Something on the order of a jeweler's saw? That's the only thing I can think of that would allow you to make such precision cuts in styrene without some kind of computerized technology doing the cuts for you.
Beautiful work, and thanks for writing it up for us.
Later,
K |
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SP 1
Brakeman
Germany
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Posted - 04 Aug 2004 : 10:23:15
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quote:
Originally posted by East Broad Top
Obviously you're not using an X-acto knife.
This is quite true. I have used my brand new (5 weeks old) mill for those 2mm thick parts. Am I now supposed to demonstrate that it will work too without machining? ;) It will, believe me.
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Jens,
Germany
aka SP 1
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ron736
Foreman
1st Class Member
USA
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Posted - 04 Aug 2004 : 11:43:18
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I am kinda surprised that the mini-micro mills are not used more by scratch builders. I just purchased a micro mill from Harbor Freight for $259.00, total cost. It has a 5 1/2" x 9 1/2" table and takes Morse no.2 tooling. With some practice any scratch builder can make accurate frames and other precision parts. I have learned milling from my own mistakes.
Ron Knepp |
Edited by - ron736 on 05 Aug 2004 04:42:27 |
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peter bunce
Railway Exec (Moderator)
1st Class Member
United Kingdom
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Posted - 04 Aug 2004 : 13:51:59
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Bruce, A quick expalnation is they cut in multiple directions - look a the following link which explains them;
http://naturecoast.com/hobby/pr34108.htm
they all employ milling cutters which (simplified!) are like very strong drills, these are moved in any direction and cut.
A useful variation is the pantograph miller which means you follow a large scale pattern (thus reduce errors), and its cuts off that; modern CAD millers are just thje same thing BUT computer controlled instead. They have also got competition from laser cutters & water jet cutters as well.
No, I haven't got one - no space, but this is what they do.
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Yours, Peter Bunce
my website is now part of www.musiccorner.co.uk: go to the G scale sections
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ron736
Foreman
1st Class Member
USA
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Posted - 04 Aug 2004 : 15:21:30
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Peter I can't agree with the comparison of CAD millers, water jets or carving pantographs. The machine I purchased for $259.00 will make accurate repeatable cuts in all materials that we use in modeling. I can make accurate cuts front and back, right and left, also drill accurate holes. For the cost of a custom locomotive frame anyone with some practice can produce one and have the machine for ever with some care. As far as space required, mine takes up a space of 18" square and is about 24" Tall.
Ron Knepp |
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Torby
Engineer
1st Class Member
USA
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Posted - 04 Aug 2004 : 17:02:48
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| I love how he made the lettring! Way cool way to make tiny detail, even though I'm not building a "Nasom" Bogie |
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SP 1
Brakeman
Germany
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Posted - 05 Aug 2004 : 02:17:11
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quote:
Originally posted by Torby
.... "Nasom" Bogie
Yes, shame on me
Thats why I recommend drawing a sketch before beginning the work.
At the german forum we had yesterday a discussion about machinery. There, a lot more people have mills, lathes etc. But there is a tendency that people immediately forget their skills when they realize that a shown model was build with help of machinery. "Oh no- I cant do this without a lathe/mill". Thats a pity.
Back to the topic. I have yesterday cut a sideframe layer by hand. For those small rectangular holes I have used a drill with 3mm diameter and then filed it square with a small file.
I had another idea concerning the scribing of the lettering "master".
While its difficult to scribe the shapes into styrene I remembered a material we used decades ago at school - Linoleum. I dont know if the english word is the same for this stuff. I have ordered some linoleum and will try my method with this material. Should be much easier - I'll report back.
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Jens,
Germany
aka SP 1
Edited by - SP 1 on 05 Aug 2004 02:19:03 |
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David Buckingham
Engineer
1st Class Member
United Kingdom
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Posted - 05 Aug 2004 : 02:44:43
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Jens
Congratulation on wonderful work
Linoleum certainly was used in England under that name as a floor covering before we all went soft and got carpets.
As a floor covering it is still available but I dont know in what other forms.
Dave |
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SteveC
Engineer
1st Class Member
USA
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Posted - 05 Aug 2004 : 03:31:39
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Jens
As David Buckingham stated for the UK, linoleum is the name used in the States too, and is still widely available. If no place else, most art supply and craft stores carry it for use in block printing. Although if I remember correctly from my early days in arts and crafts, linoleum hardens with age becoming more difficult to work with and shouldn’t be bought and stored for a long period.
Just a thought, another possibility might be vinyl floor tile that we use so much of, although I’m not sure of the smoothness of its grain.
Have a GREAT day.
SteveC |
Edited by - SteveC on 05 Aug 2004 03:41:17 |
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Rick Raively
alias E.R.
1st Class Member
USA
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Posted - 05 Aug 2004 : 07:43:17
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Hi Folks,
Just a bit curious about the technic for the lettering.
Jens mention using Resin or Epoxy. What material is used as a release agent for epoxy? Also I could not figure out what the lettering should say and the details.
Very interesting article, Thanks Jens and David
Rick R.
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FH&PB
Engineer
1st Class Member
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Posted - 05 Aug 2004 : 10:35:31
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Linoleum is certainly still available as an art material. It is soft and easily cut, and there are inexpensive tools available which will allow very fine work. It's the perfect material for the casting, Jens, and you are a genius for making the connection!
Note that the floor coverings available today are not linoleum. They are much harder vinyl (PVC?) based materials wtih hardeners added. Believe me, they are very difficult to work with and not a substitute for true linoleum. They take forever to cut and will dull your tools. |
-vance-
http://www.nmia.com/~vrbass
Join me on the Garden Railway Cruise to Alaska, August 2008!
http://www.travelingtogether.net/GardenRailroad.cfm
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SP 1
Brakeman
Germany
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Posted - 05 Aug 2004 : 11:29:38
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quote:
Originally posted by Rick Raively
Jens mention using Resin or Epoxy. What material is used as a release agent for epoxy? Also I could not figure out what the lettering should say and the details.
Rick,
The shop where you con buy resin has spraycans labeled "release agent". It isnt expensive. I dont know the ingredients.
Remember that David revised his originally drawings in a later chapter? These drawings show more detail and you find the correct lettering there too.
quote:
Originally posted by Vance
Linoleum is certainly still available as an art material. It is soft and easily cut, and there are inexpensive tools available which will allow very fine work. It's the perfect material for the casting, Jens, and you are a genius for making the connection!
Thank you, Vance. I am looking forward to get my linoleum. I think it will be ideal. But why haven't I remembered earlier...... |
Jens,
Germany
aka SP 1
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