LADmachining
Well-Known Member
- Joined
- Sep 22, 2009
- Messages
- 53
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So, the Vivell is completed to my satisfaction after remaking the needle valve and spraybar to cure a fuellling problem - time to start the next project!
I have chosen to make a start on the two crankcases I have for Lawrence Sparey's 5cc Diesel. Why two cases? I ordered a case from Hemingway Kits, and whilst waiting for that order, I spotted a case and set of drawings on eBay for a good priced. I won the auction, so now I have double the chance of getting a running engine.. ;D
More info on the engine ( http://www.modelenginenews.org/sparey/five.html ) and the designer ( http://www.modelenginenews.org/sparey/index.html )
I am currently undecided as to whether I should make both the same, or do something a little different with the newer Hemingway case - maybe make some 'embellishments' to the engine to bring it more into the 21st century, in a similar style to the one on Phil Colemans website ( http://users.tpg.com.au/pgc123/Home/sparey.html )
The Hemingway case has a nice, uniform, sandblasted finish. The registration of the two case halves is much better than the eBay case, which is of unknown origin. The machining allowances are also more generous. The mounting lugs on the eBay case are also barely above the plan size of 0.125". They will end up undersize once squared and cleaned up...
Layout blue applied to both cases.
Marking gauge used to mark center line across the back of the case, in line with the centre of the lugs.
Case 1 (eBay case) is mounted in the 4-jaw. A punch mark is set to run true using a wiggler and a DTI. Closest I got the run-out to was 10um (0.0004")
Facing the rear of the case....
Stay tuned for more updates......
I have chosen to make a start on the two crankcases I have for Lawrence Sparey's 5cc Diesel. Why two cases? I ordered a case from Hemingway Kits, and whilst waiting for that order, I spotted a case and set of drawings on eBay for a good priced. I won the auction, so now I have double the chance of getting a running engine.. ;D
More info on the engine ( http://www.modelenginenews.org/sparey/five.html ) and the designer ( http://www.modelenginenews.org/sparey/index.html )
I am currently undecided as to whether I should make both the same, or do something a little different with the newer Hemingway case - maybe make some 'embellishments' to the engine to bring it more into the 21st century, in a similar style to the one on Phil Colemans website ( http://users.tpg.com.au/pgc123/Home/sparey.html )
The Hemingway case has a nice, uniform, sandblasted finish. The registration of the two case halves is much better than the eBay case, which is of unknown origin. The machining allowances are also more generous. The mounting lugs on the eBay case are also barely above the plan size of 0.125". They will end up undersize once squared and cleaned up...
Layout blue applied to both cases.
Marking gauge used to mark center line across the back of the case, in line with the centre of the lugs.
Case 1 (eBay case) is mounted in the 4-jaw. A punch mark is set to run true using a wiggler and a DTI. Closest I got the run-out to was 10um (0.0004")
Facing the rear of the case....
Stay tuned for more updates......
I just love my workshop equipment more than most perhaps.... 
