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发动机建造 Kiwi Mk2(绝对精华)

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1#
发表于 2014-4-22 04:27:56 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
本帖最后由 motor 于 2014-4-22 04:33 编辑

发动机建造 Kiwi Mk2
After trawling the forum for the last 2 weeks and learning new things from the postings, I have finally taken the plunge. I have decided to build my first IC engine. I also took a decision to use castings which is also a first for me. I bought the kit of the Kiwi Mk2 from Hemingway Kits . I would like to thank Mainer (Steve) for sending me photos of his water cooled Kiwi (mine is going to be an air cooled version).The kit arrived by Fedex and it was nicely packed with each item individually bubble wrapped. I already knew from the sales receipt that the timing gears were missing but cheching through the items I noticed that the BA hex nuts were missing (not really bothered as I intend to go metric). Also missing were a piece of spring steel and most importantly the piston casting. I contacted Kirk at Hemingway who quickly replied that he would send the missing parts with the timing gears (when these become available in a couple of weeks).As I know that everybody here loves to see the pictures I took some photos of the castings.



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2#
 楼主| 发表于 2014-4-22 04:30:22 | 只看该作者
Some more photos
Front and back crankcase


3#
 楼主| 发表于 2014-4-22 04:31:48 | 只看该作者


4#
 楼主| 发表于 2014-4-22 04:32:41 | 只看该作者
Cylinder head, cylinder and crankshaft weights




5#
 楼主| 发表于 2014-4-22 04:33:33 | 只看该作者
Timing gear cover, conrod, carburettor and float chamber, contact breaker attachment




6#
 楼主| 发表于 2014-4-22 04:34:27 | 只看该作者
I do not have any running projects at the moment and for the last three months I have been fitting a Shumatech DRO550 which has been stored for nearly a year to my X3 mill using linear magnetic encoders. As you can imagine I am a slow worker.
I thought I would start with something simple, namely the tappet guide which is a bronze casting. After checking the dimensions of the casting, I faced one side. As you can see I cheated a bit by scanning from the plans the tappet guide diagram, made it scale 1:1, glued it to the faced casting and used it as a template. Yes, I know, not very professional. I then drilled and tapped the edge holes 3mm and then drilled and reamed the middle holes (from where the tappets pass) 5mm.




7#
 楼主| 发表于 2014-4-22 04:34:46 | 只看该作者
And this is the casting faced drilled, tapped and reamed on one side.
This weekend I will work on the other side. I intend to fix the casting to a piece of aluminium using 3mm bolts. At first I was going to use the faceplate to continue working on the casting and then I realised that at some point I will need to take it off the faceplate for milling. So now the plan is to use a rotary table instead of the faceplate and do all the operations in one setup. At least that is the plan.


8#
 楼主| 发表于 2014-4-22 04:35:12 | 只看该作者
Today I continued working on the tappet guide. First I marked the the tappet guide so that I could rough mill it before putting it on the rotary table. Rough milled it and then I attached it to a piece of flat aluminium using 3mm screws. Put it in the vice and then milled it some more.
Tommorrow final operation on the rotary table, or is it going to be a faceplate. Decisions, Decisions. I will decide tommorow. First I need a beer before going out with the family.




9#
 楼主| 发表于 2014-4-22 04:35:39 | 只看该作者


10#
 楼主| 发表于 2014-4-22 04:36:07 | 只看该作者
Today continued work on the tappet guide and the rotary table was used. Machined the circular section of the tappet guide to 14 mm diameter. Then milled down the height of the guide to the proper dimension. Took it off the rotary table and cleaned the side of the flange with a Dremel. Cleaned the whole part using 280 grit and then 400 grit sandpaper.
Final operation was to drill both 3mm tapped holes with a 3mm drill. To locate the hole under the chuck I screwed the 3mm tap in the tapped hole, locked the tap in the chuck and then fixed the tappet guide to the rotary table. Removed the tap from the chuck and inserted a 3mm drill.



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