Member postings for David K

Then each ring is parted off the same thickness as the ring groove.
The rings are very brittle so to split the ring I placed them over the edge of a triangle
file and pressed down until they snapped.

Piston rings, these are made from cast iron, a piece of round cast is turned down to the same diameter
of the piston bore. Then it is bored out to the diameter of the piston ring grooves plus a couple of thou
for clearance.

The gudgeon pins are made from silver steel and the bearings are shop
bought bronze bushes.

Back in the lathe the pistons are parted off and faced up to size.
They are then put in a jig on the mill and the valve recesses are cut into
the top of the piston.

Then cut the clearance relief on the piston skirt

Still on the mill I remove some material from the inside to lighten the piston

Transfer to the mill and cross drill and ream for the gudgeon pin

What is the best way to grind the rounded edges , I have some diamond files so I could do it by hand / eye with the files.

The bearing is only .437 inch wide so the tool is quite narrow .

I have roughed out an inline 4 cylinder crankshaft which now needs the bearings machining .

I am struggling to get a nice finish due to 'chatter' at the tool tip. I have adjusted the jibs on the cross slide so they are a little tight and set the tool to centre height.

What would you suggest the best way to grind the tip of my Hss tool to be able to take light cuts , left and right , and keep the bearing parallel.

Ah ok , thanks

I keep getting a message saying my posts have too many characters and I should split into two posts. What puzzles me is I see other posts from members with far more characters than I have been allowed. Is this because I am a new member?

Pistons, start of by turning some alloy round bar to a smooth sliding fit into the cylinder.
Then carefully put two piston ring grooves and one oil groove.

The big end bearing is screwed in , then the knuckle pins can be fitted and these stop the big end
from unscrewing.

After making the second rod I made the locating pins out of silver steel , these screw into the master
rod. The bronze bushes are standard shop bought .

I mounted the pieces onto the mill table and first drilled and reamed the holes for
the big and small end.
Then form the shape of the rod

Slave rods , starting with two pieces of aluminium milled to the correct thickness

The rod is finished apart from a little cleaning up

The rotary table is replaced with a milling vice and the slots for the slave rods are cut.

Using the rotary table I make the final cut around the small end and this releases
the rod from the billet.

The top part of the rod is reduced in thickness by 1/8'' and the lower half is cut to form the angular shape.