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Webster IC Engine build log.
Bogstandard:
I have shown this before in my other posts Chris.
Stick the bush in with a dab of loctite or superglue, as long as the bush doesn't move when doing the second operation.
Drill three, say 2.5 holes equispaced around the flush join, and then tap them out to say 3mm. Stick a grub screw down into each threaded hole, and the hub will then be a permanent fixture. Or if you don't want to use grub screws, normal screws will do, and then when in tight, cut them flush and machine them to a nice finish.
That is the method I used for fitting the flange on the tube when I did my RT mod.
Bogs
raynerd:
Guys, thanks for all the suggestions and words of encouragement! John, yes that is a really great idea - I`ll go for that method for sure! Although Stews flywheel looks amazing and the hub is nicer than anything I could do, I don`t think it is weighty enough. I`ll let you know how I get on!
Chris
madjackghengis:
Hi Chris, silver solder is about the only way to get a good solder joint with cast iron, and you need pretty much the same kit for it as you do for brazing, so if you're not set up for brazing, you've got to go with what you've got. John's suggestion is about as solid as they come, that's what I'd do. With regard to the gears, if you run a cigarette paper between the gears and use it to make space, you can use a transfer punch and get your hole right where you want it, and the paper will make sure you've got enough backlash as long as your gears are close to round and even. Aluminum foil will work, but it makes for more space, and maybe some noise from the gears being too loose. Cigarette papers are almost all universally one thousandth thick, and can be very useful in finding zero with a cutter, without touching the work and for bits like this, spacing out gears with minimum working backlash. Looking good, and coming to a point it's getting close to fire. :beer: cheers, Jack
raynerd:
Madjack - yea, I don`t have an equipment for brazing. The truth is, I don`t really know the difference between soft soldering, silver soldering and brazing - or if they are the same thing - or certainly the latter two. It is something I need to do more research on and get equipt for later on when I have more understanding in general machining. I`ll go with three threaded screws machined flush and see how it goes, it seems like a sound method
I`m looking into the future a bit and planning ahead for the time when I`ll need to sort out a carb. Apparently the one in the plans is not so good and my plan was to build the one designed for the NE15s. However, I was doing some googling last night and came across this very very simple looking vapour carb:
http://www.homemodelenginemachinist.com/index.php?topic=9587.0
Look down the page to the post by Chuck. There were some concerns regarding the safety of this system with the webster - I can't see it being valid but I was curious as to others thoughts. I expect that the fuel concentration in the tank is far too high for any explosion if the spark in the cylinder some-how comes back down the line. Any thoughts?
EDIT:
Just to add another quick question - I`ve been confused about this for a while. What is the best way to cut a cam? It is just cut it free hand and file it? I`m guessing any machining method would be complex for a one of cam?
Chris
lordedmond:
this site should give you the low down as to silver soldering ect http://www.cupalloys.co.uk/
Stuart
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