Liney RV-1 - A New Double Wide
Part 6
FlywheelI was going to make the cranks, spacers and shafts today, but I needed some quality time with cast iron.
Big chunk here; a bit over 3” diameter.
I’d really hate to do this with a hacksaw.
Here’s my CoC with the Ballpoint Font.
Unbolted the step jaws and replaced them with my soft jaws. The spacer keeps tension on the jaws while I’m boring them. Since the soft jaws are bored in place, everything stays concentric and the part can be flipped to machine the other side without having to indicate anything. Since I started using these, no more wobbly flywheels. Less than 1 foot of 6061 and worth every penny.
I dug out the carbide tooling since I use my Warner indexable HSS and the tangential holder for damn near everything. Cast iron likes the carbide.
After facing and turning side one to diameter, I flipped the part and finished side 2.
Hogging out the center recess. I kept the depth to .200” to maintain the flywheel’s mass. Normally my flywheel webs are much thinner.
So that’s one side roughed out. Flip and repeat.
Since everything is concentric at this point, the part was drilled and bored to .249”
The .250 shaft will be a press fit.
Now to the Bridgeport to drill the decorative holes. After centering the flywheel with the Blake, I had the DRO do the pattern. Never trusting my “on the fly” dimensions, I ran thru the bolt hole circle and just touched off each one. Looks correct.
So off we go. Just turn the handles until the DRO reads zero, make the hole, display the next hole on the DRO and repeat.
Running through the hole pattern again for the chamfers.
Had some chatter at the outer edge of the web. The coarsest paper I had was 220 and removing the tool marks was taking forever. Ordered 60, 80 and 120 grit emery from McMaster to do the finishing,
Here it is with a size reference. 13oz (370gm).
Looks like one more day of machining to see if it’s a runner. Then finishing, fettling, polishing, and whatever else.
Try and remain calm, but no parts tomorrow. I have a bunch of things that must be done.
Look for the next installment on Thursday evening.