Jump to content
 
  • entries
    136
  • comments
    1,860
  • views
    231,344

Peckett Progress


-missy-

2,710 views

Hello.

 

I have decided to take a bit of a break from the layout. It was getting a bit frustrating and I wasnt doing as good a job with it as I could, that plus the fact I had to remind myself that its a hobby after all and it should be enjoyable!

 

Refreshed with this in my head I have turned once again to my favorite side of the hobby which is designing and building engines. The latest one on my workbench right now is a little 0-4-0 Peckett saddle tank engine...

 

blogentry-2065-0-26387700-1350838104_thumb.jpg

 

After a very useful advice from someone with regards to Shapeways and the way to send files I resubmitted the body once again for printing and the finished body this time was much, much better with it needing only a little bit of cleaning up which I will move onto once the chassis is finished.

 

There is still work to do on the chassis but the photos show my progress to date. The chassis is built by soldering each etched Nickel Silver sideframe onto some 0.3mm thick PCB and then filing out the shape through the etched bit to keep the profile. Both sideframe sandwiches are then soldered onto some solid 1/4" square Brass bar with gaps added for the gearbox, and then filed to suit the sideframes. The gearbox is one of my 138:1 ratio designs I did a while ago. This makes into a very rigid and strong chassis for its size, it also adds valuable weight too.

 

blogentry-2065-0-77093600-1350838104_thumb.jpg

 

The wheels are 6mm Driving wheels using 2mm Association turned wheel rims onto 3D printed centers. The rest of the bits come from an etch I designed.

 

Its comming together quite well, its runs really quiet and slowly which has made me very happy! Dont forget too that the engine is just 40mm long bufferbeam to bufferbeam...

 

Julia :)

  • Like 38

22 Comments


Recommended Comments

  • RMweb Gold

Pleased to see the body has turned out well in the end! It's looking great, and that chassis is pretty impressive too considering the size!

 

Tom.

  • Like 1
Link to comment
  • RMweb Gold

That looks really good, Missy. Glad that this turned out well after the initial frustration. You deserve it too, with your persistence.

  • Like 1
Link to comment
  • RMweb Gold

Excellent work Missy. Really look forwards to seeing this finished.

 

What colour are you going to paint the Peckett?

 

Cheers,

 

Mark

  • Like 1
Link to comment

Thanks guys :)

 

I am really pleased with the way its turning out. As with most of the stuff I do I am really taking my time building this to try and get it as good as I can, and I think its paying off!

 

Mark - The wheels are a hint of the colour..

 

M :)

  • Like 1
Link to comment

Julia, nice to see you resolved the problems and that the project is coming

together. Any plans for a little layout for this...?! Chris

  • Like 1
Link to comment
  • RMweb Gold

 

Mark - The wheels are a hint of the colour..

 

M :)

 

Ah! A little taster of things to come ;)

 

Good choice :D

  • Like 1
Link to comment
  • RMweb Gold

Very impressed to see and handle it at the Didcot show on Saturday - a smashing piece of work and the chassis was remarkably heavy for its size so I think it's going to run as well as it will look.

  • Like 1
Link to comment

That looks really superb. You seem to have got a good technique working on the bits where domes, chimneys etc meet with the 'barrel' of the saddle tank. I'd be very interested to see a close up picture of these areas printed in 'Frosted Ultra Detail' as it is these bits that I can't just get right in my own designs.

 

I look forward to seeing the Peckett some day!

  • Like 1
Link to comment

Always nice to see a model example of a product from my favourite industrial manufacturer. At least in 2mm, the characteristic of the real thing that is such a pain in 4mm - the abundance of rivets typical of most Pecketts - can be largely ignored! A very impressive piece of miniature engineering.

 

Adam

  • Like 1
Link to comment

Hi Guys :)

 

Any plans for a little layout for this...?! Chris

 

Thanks Chris. No plans myself but it would go onto the Oxford 2mm Groups layout a treat. A 5m x 4ft? finescale layout depicting an Iron Works...

 

That looks really superb. You seem to have got a good technique working on the bits where domes, chimneys etc meet with the 'barrel' of the saddle tank. I'd be very interested to see a close up picture of these areas printed in 'Frosted Ultra Detail' as it is these bits that I can't just get right in my own designs.

 

I look forward to seeing the Peckett some day!

 

Hello Will. It took a few attempts to get those bits right but I feel I have sussed out how to do it using Inventor. They should have the correct profile around the bases. I will try to take some close up photos once the body is painted so it will show up better. Im sure you will see it sometime...

 

Fancy having a go at some 3D BR Standards?

 

Im intrigued as to why you asked that. There are plenty of BR Standards in both OO and N that could be easily adapted.

 

Missy :)

Link to comment

Very cool. Can you pass on the advice about sending the files to Shapeways, please? I've had a bit of a problem with some of my parts too.

Link to comment

Very cool. Can you pass on the advice about sending the files to Shapeways, please? I've had a bit of a problem with some of my parts too.

 

It was Ian Smith who said to me not to sprue the parts together but just leave them 'floating' in the same file that you upload to Shapeways. What might have happened with my first attempt is the bits that were sprued to the main body might have trapped the supporting wax they use. That and it apparently limits the orientation they can print...

 

Missy :)

  • Like 1
Link to comment
  • RMweb Gold

Very impressive Missy. If I understand your construction it would be possible for the chassis to be insulated provided the bearing didn't touch the inner Copper layer of the PCB but as you use your own plastic wheel inserts they are obviously insulated. Also can you use Simpson springs with this method?

Regards Don

Link to comment
  • RMweb Premium

Wow! Can't believe how small that is. The detail at that size is really impressive and it works too!!!!

Link to comment

Hello Don.

 

If I understand your construction it would be possible for the chassis to be insulated provided the bearing didn't touch the inner Copper layer of the PCB but as you use your own plastic wheel inserts they are obviously insulated.

 

You are right, in this instance because of the wheels being insulated I dont really need to insulate the chassis as long as the wheel pickups are isolated away from the chassis. Normally I would use PCB to insulate the inside of the side frames and use the sideframes (and the outside of the sideframes) as the 'live', picking up through the wheel axles with normal 2mmSA wheels. Its how I made the chassis for the pannier tank amongst others.

 

Also can you use Simpson springs with this method?

 

I havent tried it yet but I am guessing it would be a little harder to do as the extra pickups are normally soldered to the inside of the engine sideframes. Any ideas on how to do it?

 

Wow! Can't believe how small that is. The detail at that size is really impressive and it works too!!!!

 

Thanks, its actually quite large for me, take a look at some of my previous posts...

 

Missy :)

Link to comment
  • RMweb Gold

I havent tried it yet but I am guessing it would be a little harder to do as the extra pickups are normally soldered to the inside of the engine sideframes. Any ideas on how to do it?

 

The sensible thing to do would be to put them outside the frames, almost like conventional pickups - top acting is best but back scrapers work perfectly well. John Greenwoods Bodmin which I run has top acting pickups like the old Ibertron chassis and runs beautifully. Of my locos, the Jinty , 'Holly'(Hudswell Clarke), 'Stephanie' (Terrier) and the 'General' (?) all have springs/pickups soldered to the outside of the frames. I would try to arrange something like that for the Peckett and keep the solid lump in the middle of the chassis - that weight is very useful and exactly where you want it.

It should be remembered that the name Simpson springing is a bit misleading as it doesn't really act as a spring but a very effective auxiliary pickup.

 

Jerry

Link to comment

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...