MadModder
Gallery, Projects and General => Project Logs => Topic started by: sbwhart on August 07, 2015, 04:23:15 AM
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I want to make a model of a Grasshopper Engine, but have had trouble finding a suitable cast fly wheel that would suite this type of engine, I tried buying a suitable fly wheel that is provided as part of a set of casting for one of Antony Mounts engines but I would have to buy the complete set of casting they wouldn't just sell the fly wheel. So I decided I would see if I could make one from a laser cut blank.
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02309_zpsler38neq.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02309_zpsler38neq.jpg.html)
Its 160mm diameter (6") and its cut out of 12mm black mild steel
I skimmed up the face and thinned the spokes down a little and shaped the rim and put a roughing drill down the middle.
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02311_zpsq3c1z9yo.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02311_zpsq3c1z9yo.jpg.html)
I then flipped it round and clocked the bore up, then machined that side up to match the other, and bored out the centre to 12mm.
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02313_zps7hnxfvjj.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02313_zps7hnxfvjj.jpg.html)
I then turned up a 12mm mandrel mounted the wheel to it a skimmed up the rim.
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02317_zpsxoykefgg.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02317_zpsxoykefgg.jpg.html)
To give the impression that the wheel is riveted together (that's what they did in the 1850) I drilled some 1/16" holes in the spokes to take some dummy rivets
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02325_zps4kpvpubw.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02325_zps4kpvpubw.jpg.html)
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02326_zpszb9jehxn.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02326_zpszb9jehxn.jpg.html)
I then made a 2 part hubs again with some dummy rivets
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02329_zpsiwrgkq1i.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02329_zpsiwrgkq1i.jpg.html)
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02330_zpszrjrvwfa.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02330_zpszrjrvwfa.jpg.html)
And stuck the lot together with high strength Loctite
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02336_zpsmcncidev.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02336_zpsmcncidev.jpg.html)
I'll post some pictures of it painted when the paint dries.
Stew
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Very nice :thumbup:
If you had had it grit blasted with a coarse grit (before adding the rivets) you'd barely know that it wasn't cast as the texture would be very similar
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Nicely done, Stew! Saving this for future projects.
Chuck
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Thanks for sharing that, Stew. Turned out really nice,I'll also be filing this away for future use :thumbup:
.......OZ.
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brill Turned out really nice
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Cheers Guys.
The paint is dry so her it is in Seductive Black
(http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02340_zps3hsggwos.jpg) (http://s431.photobucket.com/user/sbwhart/media/Grashopper%20Engine/DSC02340_zps3hsggwos.jpg.html)
Stew
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:thumbup: Top banana . Looks just like an antique mill engine flywheel.....OZ.
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Excellent stuff. Pin stripes next? Looking great as is usual with all your posts.
John B