!!

Not Registered?

Welcome!  Please register to view all of the new posts and forum boards - some of which are hidden to guests.  After registering and gaining 10 posts you will be able to sell and buy items on our N'porium.

If you have any problems registering, then please check your spam filter before emailing us.  Hotmail users seem to find their emails in the Junk folder.


Thanks for reading,
The NGF Staff.

Author Topic: My new locomotive works...  (Read 55131 times)

0 Members and 1 Guest are viewing this topic.

Online Stevie DC

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 2119
  • Country: 00
    • Awards
Re: My new locomotive works...
« Reply #735 on: September 15, 2019, 10:07:11 AM »
Some further work on the N1 chassis this morning resulted in the roughing out of some chassis weights.



I've left 0.5mm clearances all round so that nothing can short out and to generously allow for modest intolerance's in the internal dimensions of the prints. I'm toying with the ideal of 3D printing the weights and then casting them in white metal. The calculated volume of the weights is 3.22 cubic centimeters which would make them 33.35g in white metal (27.05g in brass). Having weighed up the loco body, wheels and motor, this would bring the theoretical weight of the N1 to between 44g and 50g, with most of the weight over the drivers; by comparison, the loco end of a Dapol A3 (minus bogie and cartazzi truck) weighs in at a little over 55g . Given that the rear radial truck will be a swinging bogie, I may revisit the bunker weight in the future as it may prove to be more of a hindrance than a help.
« Last Edit: September 15, 2019, 10:13:15 AM by Stevie DC »

Offline maridunian

  • Trade Count: (0)
  • Full Member
  • ***
  • N Gauge Society Number: 28772
  • Posts: 710
  • Country: wales
    • Awards
Re: My new locomotive works...
« Reply #736 on: September 15, 2019, 04:05:30 PM »

"the loco end of a Dapol A3 (minus bogie and cartazzi truck) weighs in at a little over 55g

Hi Steve

I wondered whether you'd ever got Shapeways to print one of your designs in brass?

Mike

Online Stevie DC

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 2119
  • Country: 00
    • Awards
Re: My new locomotive works...
« Reply #737 on: September 15, 2019, 08:45:39 PM »
I wondered whether you'd ever got Shapeways to print one of your designs in brass?

Hi Mike,

I can't say that I have. That's partly because of the cost and partly because the brass castings I've seen haven't been as good as I would like for the money. Having tested some RTR locos that are in the predicted weight range of the N1, I think that this will be sufficient for the tasks that will be required of it.

Online Stevie DC

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 2119
  • Country: 00
    • Awards
Re: My new locomotive works...
« Reply #738 on: September 16, 2019, 06:40:25 PM »
A start has been made in converting the chassis 3D CAD into a 2D etching artwork.



Not everything has been drawn yet and the final placement of components is yet to be decided but it is slowly coming together. The main chassis is actually two halves and not one piece as it appears here. However, the bogie will be folded up from a single piece, to help keep it aligned, and gapped for electrical isolation once the PCB spacer has been soldered in place.

The extra set of coupling rods are in case the 0.5mm lamination proves to be to thick for the Farish crankpins (it's boarder line). The second set have a half thickness back lamination which will bring the overall thickness of the rods to 0.375mm. 
« Last Edit: September 16, 2019, 06:42:49 PM by Stevie DC »

Online Stevie DC

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 2119
  • Country: 00
    • Awards
Re: My new locomotive works...
« Reply #739 on: September 17, 2019, 09:37:34 AM »
Annoyingly, after posting the last screen grab on here last night I noticed some misalignments between the upper and lower layers of the artwork. Something had been pulled out of position which had affected the whole of the chassis section. I had to redrawn this this morning and, lesson learnt (again!), have made a copy of the file as a backup if this happens again.

Hear are the two layers for the chassis.

The top or front layer of the artwork.



The bottom (back) layer.


 

Please Support Us!
October Goal: £100.00
Due Date: Oct 31
Total Receipts: £74.00
Below Goal: £26.00
Site Currency: GBP
74% 
October Donations


Advertise Here
anything