Engines > From Kits/Castings
Patterns for castings
John S:
I'll bet Jo is eating her heart out after refusing my hand in marriage the workshop after seeing these pics. :ThumbsUp:
One of the reasons for buying the laser cutter was from a post I saw on Madmodder where some guy [ only posted once and never returned or answered PM's or email ] mocked a cylinder head up for a Subaru out of 1/5mm card.
Can't show some of the work as it's propitiatory and the customer doesn't like work splashed round t'internet so did this instead.
Five layers cut out of 3.2mm thick MDF to replicate a timing cover or similar.
The holes are needed to accept wooden dowels to line up whist the glue is drying under clamping pressure.
Assembled with M5 screws holding it together for the photo shoot, as an idea of size the small inner diameter is 20mm and the larger inner diameter is 40mm, bosses are 10mm.
Angled shot of the same showing a bit of scrubbing with a strip of emery. If this was a genuine pattern each layer would be slightly larger than it's predecessor to give a draft angle.
It's a doddle to do this and also allow for shrinkage as it's all a question of scale in simple 2D CAD.
Simple job and not using draft angle it took 20 minutes from off the top of the head drawing to bolting the cut parts for the photo shoot.
How about it Jo ? If it's borderline I can throw 7 lathes, 11 mills, 6 welders, 2 plasma cutters and the laser into the hat ? :NotWorthy:
Chris J:
Jo is obviously picky but I might be tempted
Let's have some details of your cutter John.
Jo:
--- Quote from: John S on February 05, 2013, 09:59:29 PM ---How about it Jo ? If it's borderline I can throw 7 lathes, 11 mills, 6 welders, 2 plasma cutters and the laser into the hat ? :NotWorthy:
--- End quote ---
Clearly a man after my own heart.. ;D
Would you like to talk castings?
Jo
Jasonb:
Jo the same method can be used for traction ploughing engine parts but don't get tempted to go to 6" like Andy's
Just glue them together ad a bit of body filler, blend then paint and you are good to go.
JS I don't know what MDF you are using but if you try the MR (moisture resistant) type which is usually tinted green tou will find it far more stable on thickness and it also has a denser "grain" so the edges don't fluff up so much when you start painting the pattern
Jo:
--- Quote from: Jasonb on February 06, 2013, 08:12:27 AM --- but don't get tempted to go to 6" like Andy's
--- End quote ---
I have no desires for a 6" :o, it is just too big to handle.
Jo
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