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Wow ,You make it look so easy. How long did it take to design the pattern using Alibre and then to convert it into a machining program?Jo
Fantastic pattern, Steve, and it looks to have a superb finish. Is shrinkage allowance built in, and is there a draw taper there as well? I'm not familiar with the engine, is there a link to find out more?Cheers, Hugh.
What tooling do you use to cut it, (HSS or carbide), and what feed/speed would you use to cut it. I want to set it up as a material in BobCad.
The finishing pass with a 1/16 bit must have taken a loooong time! It looks great, I will have to investigate this Ren board material.Lee
Steve,First off, it was good to talk to you in Zanesville in October. Maybe you remember.Some time ago, I bought the casting for the Deezil form Roger Schroeder. I started the build, and somewhere in the process, I ruined the casting. Since I had already accumulated some stock, and worked out procedures, and made some fixturing, I intended to get another casting and give it another try in the future. Sadly, in the meantime Roger Schroeder passed away.Anyway, good and interesting work on the patterns.--Tim
Thanks for that link, Steve, a thoroughly entertaining history of two terrible engines! I'm sure yours will will not carry on the weak genes of the line.I'm assuming that the patterns are for sand casting - are cores involved? I can't see any core prints there, although the runners are very well sized.Cheers, Hugh.
'396, another question. I ordered a sample kit of Ren Board form Freeman, looking at their site, the number of different grades made it non obvious which one to get. As material goes, it's cheaper than machinable wax, but still a sizable investment for a whole sheet.Will you use the Ren Board you machined directly as a pattern, or make a rubber mold and use Repro castable urethane? It seems ramming sand around those small fins may cause some breakage. Also, what do you finish the Ren Board with?Maury
Hey Steve,Why not mount that to a match plate? It will support the pattern and runner and make the whole thing a very strongAll a match plate is , is a piece of heavy plywood. Pattern and runners on one side.....filler spout on the other.......makes it easier to take from the mold too....
That's bad luck, Steve. The curse of Gotham? Any point in making it at 90-95% full size?Hugh.
After reading the story on the deezil it makes me want to build one and see if it runs and for how long. Would make an interesting contest too lol.