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Project Halo
bogstandard:
Kirk,
Nothing was pre cut for the tapered finning. By using my cutting routine, everything comes out as it should. All the plunge cuts between the fins are done first, then the fins are plunge cut to correct size afterwards.
All the spigots I have made are 0.500" give or take half a thou. Because the crankcase is not pressurised and so doesn't need to have close fitting cylinder parts, I am most probably going to just drill the holes in the crankcase, haven't decided just yet, I might even bore them, that is just as quick as drilling. A couple of thou 'woggle about' clearance isn't going to do any harm to this engine. But I will be making a drilling jig that drops into the 1/2" hole and machined flange recess, to allow me to very quickly hand drill the four flange mounting holes.
You have to remember, you will be using your RT standing on it's side, so throat clearance has to be thought of when coming to fit long bits into holders. I usually wait until it is all mounted up before making a decision. I might find that the only cutting tool I can get in is a 1/2" slot drill, and so will have to use that. Or maybe even use the spindexer, that would give me a lot more throat clearance.
Those are a long time off yet, and anything can happen in the meantime.
Ron,
I need to get all the fins cut before I can change the lathe over. As soon as that is done, I will make up a bit of a post to show all the methods I know of to find centre height, then people can add their ways as well, so it will then become a reference post. Unless someone wants to start it off before I am finished.
John
ozzie46:
No hurry John, I know your pressed for time on these Halos. I'll be waiting :coffee: :coffee:
Ron
Divided he ad:
I went over to see John yesterday (didn't get onto my 'puter last night!) He showed me the cutting of the fins on these very small cylinders........ :bugeye:
5 min's and there's another done...! Fair do's a bit of forward planning added to the very quick and accurate turning of the handwheels and it was all done!
The DRO set up meant that the work was barely looked at :jaw: I can see me saving up! :lol:
It was good to see you John, seems like ages since the last time.... Always good to sit down and talk through stuff :)
Also now I've got a little more than a bit of plastic material to practice making flywheel spokes on....... So now I have to concentrate!!! :scratch:
I'll be looking forward to seeing how you get around the next bit when you do :thumbup:
Ralph.
NickG:
Ralph, I remember using DRO's at university and I agree, good quality ones are superb. Just due to the amount and quality of equimpent, I made things there 11 years ago when I was 18 that I have not managed to repeat on my machinery!
I intend fitting some digital scales to my machinery but don't think I can justify proper DROs! Some of that money would probably be best spend on tooling for me such as a rotary table, quick change tool post, power hacksaw etc. things to take some of the tedious stuff out which will encourage me to do more!
Nick
bogstandard:
Glad you enjoyed the demo Ralph. The DRO's do save a bit of time, but instead of DRO gazing, watching the handwheel dials would be almost as fast. A little bit of preparation, and difficult bits like cutting the fins are not difficult any more, as I showed you. Also, I was not doing anything that anyone else on here couldn't do, if a little bit of care is taken in the setting up.
It is always nice to have visitors, especially in these difficult times. It cheered Mal up no end.
Now you just get on and practice on that RT, you will soon be banging out flywheels by the dozen.
Thanks for the visit.
John.
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