Messages

241

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

« on: May 30, 2011, 01:13:49 PM »

Went ahead and put some valves in 2 of the heads. I found that about half of the valves had the groove cut to big and the clip would not seat into the retainer. I chucked them back into the collet and cut the grooves .002 deeper and they went together like they should.




Then I decided to install the rocker studs more perminent. They had been screwed in finger tight forever.




With the heads being done I nailed down my finished push rod length. I only had enough rod to make 12 rods but that will be fixed tomorrow.




Then a set of rockers were assembled and put into place. Nothing is adjusted with the camshaft not properly timed yet.




I need to get on the distributor soon but I have not had the drive to work in the garage lately

242

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

« on: May 26, 2011, 07:17:35 PM »

Scratch camshaft off the list.




And the shaft is completed other than a few lobes that need just a bit more filing.

243

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

« on: May 24, 2011, 09:14:51 PM »

Well it has been an exhausting week. I had some trouble with the CNC mill. The Z axis would work fine for hours and all of a sudden it would skip steps. I think I narrowed it down to the drive. I rebuilt the control panel to include 3 Gecko drives and new 570oz motors. The machine now moves around so fast it's scary.

Now I should be able to get back to building engines!!!

244

General Mach Discussion / Mach from command line

« on: May 13, 2011, 11:06:19 AM »

What are the command line args to envoke a session of mach3turn? I have tried a few things and nada.

drive\folder\mach3 /?

245

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

« on: May 11, 2011, 10:59:33 PM »

George Trimble also included a design for a ring cutter in his SIC article. It had opposing cutting tool blades ground like Steves wire cutters. The critical point is that the break is perpendicular, so that when the ring is mounted in the heat treat fixture the annealed diameter is not changed.

Rhemus told me that there is a better method that makes better rings than trimble's method. It will be in MEB shortly.

246

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

« on: May 11, 2011, 02:15:27 PM »

That is brilliant Steve just brilliant.

One question I have concerning your cast iron piston rings - The bore and OD were turned, they were parted off then they were placed on a mandrel and heat treated but how did you make the split in the rings (O into a C) please ?

Tweakie.

Wire cutters. They dont cut the cast they crack it. Get lined up real square and squeeze to crack them. At the size I made them, it's real easy.

247

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

« on: May 11, 2011, 01:28:59 PM »

Here is prototype #1.

248

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

« on: April 14, 2011, 07:02:00 PM »

Photo bucket isn't showing your fixture for these rings, but I got away from the anti scale compound by covering the heat treat fixture with this cover. I still added a little bit of paper bag to take up any excess oxygen. The center bolt holds it in place, and the extra collars are so I can treat shorter stacks of rings.

I developed this ring spreader after breaking 24 oil rings through the oil hole opposite the gap during installation. A ring is placed in the holder and followed with the small aluminum ring to keep things square. When the tapered plug is pushed through the ring is opened up evenly and the sheet metal wedge is placed in the gap. The small ring may be removed, and when the fixture is placed over the ring groove the wedge is removed and the ring snaps into place. One of the cylinders is the wet sleeve, the other is a tapered ring compressor.

Thanks for the info!!  I may try the shielded fixture someday. This is only my second batch I have made this way.

249

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

« on: April 10, 2011, 09:41:21 PM »

not u the part

I knew that!!

250

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

« on: April 10, 2011, 09:40:44 PM »

The rings have cooled. I had to boil them to remove the anti-scale powder. I made them .001 thicker than needed so I will polish them with some 600 grit before installing them onto the pistons.