Messages

301

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: November 01, 2010, 07:51:36 PM »

Hello all!

All 40 of the valve blanks are completed. They take forever but it will someday be worth it.




To cut the slots I used my ER11 collets. I was able to put the valves in backward and slot the stem for the E-clips. I have an insert holder and a .020 slotting tool. Makes it easy to have a nice sharp tool because I stink at grinding tool bits.








Then I made a few test pieces. I chose not to reduce the size of the stem at the head so I could hold the valve real close for rigidity. I took a light cut accross the face. I want the valves flush in the head and the hole for the valve cage is .250 so I reduced the OD of the valve down to .245.

 

Then I cut the valve angle into the back surface.



So now you all know what I'll be doing tomorrow!!

302

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: October 26, 2010, 07:37:42 PM »

Hello All!

Spent the afternoon pressing in all the valve cages. I made s simple drive dool slightly smaller than the ID og the cage and pressed them in a drill press. I like the fact that the press fit does not need to be very tight because the cage cant be shot out by the compression of the cylinder.

I also started to make some valves. These wont go as fast as the cages.

Stand By!

303

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: October 25, 2010, 07:29:23 PM »

Cross valve cages off the list. HOLY CRAP!! there are alot of them!!

304

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 22, 2010, 08:20:01 PM »

Finally made some progress with the crankshaft. Over the last day or two I managed to make the fixture to hold the pieces for turning. It's an ugly bugger but I did make a test piece and it works very well.


The first thing I did was to mill the square ends on the pieces that require them.






The pieces are then put into the fixture and the turning begins.






One down and eleven to go!!!



Cheers!

305

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 12, 2010, 08:27:29 PM »

You do realize that you've now put the "build an engine" on some of our "to-do" list, don't you? I don't know if I should thank you or be disgruntled, because my list isn't getting any shorter. Thanks for sharing your build with us.

Sorry about that!  After the first one ran, I just cant stop.

306

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 12, 2010, 03:07:31 PM »

Hello All!

Made a bit more progress today. Chucked up the rear pieces and started to finish them up. I used my "bat wings" (brass inserts) on the jaws so i wouldn't damage the finish. Indicated to less than .001




I turned the shaft down to about .010 over size and then got the tail shaft ready for threads.




Ran the threads on.




Finished the shaft to .0005 - .001 oversize and then i like to bring the shaft to size using some 320 sand paper. This way I can work the taper out if there is any and i can usually hit my number within a few tenths.




Then I put the taper on last.




Thats about all until I get my hands on a 5/16 collet.

307

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 11, 2010, 08:11:00 PM »

Hello all!

Had the chance to start on a 4 piece crankshaft. The plan is to make 4 pieces that lock together with a square end and socket. The square will allow me to index the crank arms in 90 degree increments. The design will also allow all the main bearings to be ball bearings.

The 2 center sections and the rear section all have one of the ends the same. So i spent the day turning the same end on 9 pieces. I made enough pieces for 3 shafts hoping for enough to make 2 when i'm done. The tip of this end will be milled square.





The front piece is different so I turned the front shaft. All 3 have a real tight slip fit. I'm real happy with the fit of the bearing.




Then the front pieces were rotated around and chucked into a collet. The rear of the piece was then finished. The rear of this piece will have a square milled into it to accept the piece behind it.





This should all become a little clearer as the pieces progress.

308

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 09, 2010, 08:15:32 PM »

Please forgive a silly question, but I have to ask. Is this thing going to actually run???

Yes that is the plan. I started building air and steam powered stuff about 4 years ago and it has lead me into gas powered stuff. I finished my first gas engine and have been hooked.

First effort was a V4

Video: http://www.youtube.com/watch?v=1-JRQGPswVA
Photos: http://www.floridaame.org/GalleryPages/g1M0348.htm

309

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: September 07, 2010, 06:34:40 PM »

It really does require a tremendous amount of skill to put in that amount of machining without a major snafu.

Thanks guys!

I haven't had much time lately because work has gotten out of control a little. When I get something done, I'll get you updated.

Who say's I haven't had any major snafu's. If I didn't, there would be 3.

310

Show"N"Tell ( What you have made with your CNC machine.) / Re: Cylinder Heads

« on: August 25, 2010, 07:01:50 PM »

Victory!

Both blocks are completed! Not sure where i'm going to go from here. I have to work 12 hour days for the next week so I will have lot's of time to figure it out!!!!!