Going over to the dark (CNC) side!

[Jasonb]

nice to see the results of your labours, I posted about this pattern back in post number 253 and have just seen the casting, hopefully will get a more detailed image once it has been offloaded from the lorry

[Alyn Foundry]

nice to see the results of your labours, I posted about this pattern back in post number 253 and have just seen the casting, hopefully will get a more detailed image once it has been offloaded from the lorry

More yours on the final stretch Jason, many, many thanks.

Yes having patterns made to such a high standard makes a huge difference to the castings. This was something that Roger “ the pattern “ used to say about them being of 110% to get 100% finished.

Attached are a couple of pictures of the castings.

Having had many complaints about over fettling of castings I make sure that mine are just blasted, as you can see.

Cheers Graham.

[Jasonb]

Good to see a few more images Graham. The second attempt at the main casting looks to have come out very well. What about a group shot of the rough assembly with the beam as well

[Alyn Foundry]

Good to see a few more images Graham. The second attempt at the main casting looks to have come out very well. What about a group shot of the rough assembly with the beam as well

LOL….

Once the beam yoke and bearings come out from the four jaw then yes….

[Johnmcc69]

 
 Great work gentlemen! The patterns & parts look very good.
 What's the material & shrink factor(s)? What do you find works as draft angles?
 I'm only familiar with die cast design of aluminum & zinc, so I find this very interesting.
 

 John

[Jasonb]

They are all iron castings.

Mostly 3degrees of draft on the patterns I made with 1% shrinkage allowance

[Alyn Foundry]

Although I’ve been an amateur pattern maker for the best part of my adult life, these machine made patterns surpass anything I’ve used to date. The accuracy of fit is truly amazing.

Closeup of the Brayton beam yoke after line boring the main bearing caps. The whole engine as a partial mock-up with the cylinder that was finished about 15 years ago.

I can’t wait to see the results of Jason’s latest endeavours coming back from the foundry. 😉

[Alyn Foundry]

Taken from The Shining….

Here’s Otto…. 

[Jasonb]

Not too shabby, what's the writing like?

3mm off top and bottom and 2mm of the bearing split line.

[Alyn Foundry]

Not too shabby, what's the writing like?

3mm off top and bottom and 2mm of the bearing split line.

Plain enough to read and discreet enough for use ! 😉

Off to the Le Blonde.

   Graham.

[Jasonb]

My castings turned up today and I'm quite pleased with how they came out particularly as it was my first pattern with a core. External surface finish could have been a little smoother but I think that is one of the problems with airset as they don't seem to sieve any fine sand on first and just ram it up in one thick layer which can leave the sand surface a bit porous so the iron replicates that. These are the bits from my patterns



The bit of writing that  was a last minute addition turned out quite well, easily read yet out of sight for most that will view the model.





And here is the rest of the "set" including the scotch yoke which is a brass casting and the spun brass piston which will give it a thin wall and light weight which should help with running. There is also a flywheel casting which I forgot to include in the photo.



I just need to catch up with Graham now who is posting good progress over on his Facebook Page

[Alyn Foundry]

Pleased to read that your castings arrived safely Jason.   

For those that might be interested here’s the inspiration behind what will become known as “ Little Otto “

N A Otto, famous for the four stroke cycle was dabbling with atmospheric designs prior to his momentous discovery. The original engine that lived in the Deutz museum went “ missing “ many moons ago. A member of our group decided to make a full scale replica of which I immediately fell in love with.

  Graham.

[Admiral_dk]

Thanks for the history Graham 

I can see why you both are very pleased with the result 

Per

[Dave Otto]

Nice work guys!

Dave

[Vixen]

Congratulations are due to both Jason B and Graham C, 

Some very nice patterns and fine iron casting. That's a nice touch to include the names of those involved, hidden away inside the casting

Mike