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George Miller · 10-07-2015, 01:34 PM

Also, I wonder why you bored the big end of the rods on your lathe?

To me it is easier faster, no tapper when bored, more rigid, so no chatter.

I always did it in the mill, to insure parallelism of the hole, with the just bored wrist pin hole

The fixture on the lathe makes sure it has no twist. parallels between face plate and part make sure it is square. Then you can check it with a indicator for final check.

Wondering also if you did the line boring your self?

Yes made my own machine. use on the mill with a right angle head.

I have made 3 sets of 7075 rods before for the A crank for different kinds of pistons. They worked real well.

10-07-2015, 01:34 PM	#43
George Miller Senior Member Join Date: May 2010 Location: NC Posts: 2,975	Re: 5 main, chev, crankModel A engine Also, I wonder why you bored the big end of the rods on your lathe? To me it is easier faster, no tapper when bored, more rigid, so no chatter. I always did it in the mill, to insure parallelism of the hole, with the just bored wrist pin hole The fixture on the lathe makes sure it has no twist. parallels between face plate and part make sure it is square. Then you can check it with a indicator for final check. Wondering also if you did the line boring your self? Yes made my own machine. use on the mill with a right angle head. I have made 3 sets of 7075 rods before for the A crank for different kinds of pistons. They worked real well.