Blower for The Demon V8
- Thread starter stevehuckss396
- Start date
Help Support Home Model Engine Machinist Forum:
I keep getting side tracked. I am working on a crankshaft right now but I keep screwing them up. Good thing metal is cheap. Oh wait a minute.
I started making a new crankshaft. I have made 2 changes to my process to try to get better results. I was getting some major chatter. The crankshaft has a front shaft a little over an inch long and a tail shaft more than 2 inches long. Those diameters are at there largest .250 inches. To increase rigidity I made some blocks for the ends with the centers drilled in them that those shafts can slide into and take out the flex. I also changed my tooling. The accepted way to grind tools is to grind a small relief in the center of a parting tool to create a forked tongue in the end. I took a .094 wide parting blade and ground a right hand tool on one end and a left hand tool on the other. I machined the mains and both ends to spec between centers. Then the blocks were installed and the throws were cut in the mill and finished in the lathe one at a time. Absolutely no chatter at all and super nice finish on everything. I suppose I had about 10 hours in the shaft when I went out this morning to finish the last throw. I put the shaft in the vise in the wrong orientation and cut about half way thru the last throw before I realized what I did. Everything was working perfectly except my brain. Tomorrow I start my third!!! I think this is karmas punishment for not taking pictures to post.
Art K
Well-Known Member
- Joined
- Jul 4, 2012
- Messages
- 218
- Reaction score
- 39
Steve,
I won't accept that you are being punished for anything. But everything goes back to the old adage measure twice cut once, been there myself though I've only been doing single throws so far. Good luck with the third.
Art
I won't accept that you are being punished for anything. But everything goes back to the old adage measure twice cut once, been there myself though I've only been doing single throws so far. Good luck with the third.
Art
CNC-Joe
Well-Known Member
Karma told me - that you should take pictures this time.
We may have to rename you "Earl".
We may have to rename you "Earl".
Hows it going Joe! Good to hear from you. Are you going to the christmas party?
BTW, my middle name is Earl, no joke!
Its 7 inches long and .980 diameter. Front and rear shafts are .249 and the rear tapers to .190 with a 10-32 thread. The 3 mains are .374 and the rods are .249
Nice to have it out of the way. Bout killed me.
