B
BRIAN
Forum Guest
Register Today
Single pointing the thread 1/2" x 16 TPI. for a close fit.
Next the Hex.
brian
Next the Hex.
brian
-
Welcome back Guest! Did you know you can mentor other members here at H-M? If not, please check out our Relaunch of Hobby Machinist Mentoring Program!
B
BRIAN
Forum Guest
Register Today
Got it done at last
.
Now for the other one
Brian
.
Now for the other one
Brian
B
BRIAN
Forum Guest
Register Today
The time has come to sort out the drawing for the crankshaft and turn the doodle of the general arrangement into a working set of drawings, also the order of work to be able to assemble it.
It looks like it may fit!!
The crank is below the cylinder center line on this engine to give better torque, smoother slow running, less piston slap,
etc. offsetting the crank gives a greater rotational effort, the crank moves over the normal 180° on the power and inlet stroke's in consequence the exhaust and compression strokes have less angular crank rotation.
This is known as Desax . It is also used in 2 stroke engines to vary the port timing, offsetting the piston pin is also done for the same reason.
Brian.
It looks like it may fit!!
The crank is below the cylinder center line on this engine to give better torque, smoother slow running, less piston slap,
etc. offsetting the crank gives a greater rotational effort, the crank moves over the normal 180° on the power and inlet stroke's in consequence the exhaust and compression strokes have less angular crank rotation.
This is known as Desax . It is also used in 2 stroke engines to vary the port timing, offsetting the piston pin is also done for the same reason.
Brian.
B
BRIAN
Forum Guest
Register Today
While i ponder the problem of fixing the flywheels, I am pushing on with the connecting rod.
First a blank of the correct width but over length was cut, then fitted on the mill to drill the holes for the big end screws.
this was then cut off to make the end cap.
The cap blank was then trimmed to the correct length and the surface of the rod blank trimmed.
The thread's were cut 4mm and the two parts reunited, then mounted on the mill, and the edge finder used to locate the center of the hole for the big end bearing.
Using the slot drills in 4 stages the hole was opened out to 16mm. BUT when I measured the hole it was 15.5 Crap new Chinky slot drill *****x?
Luckily I had not moved the X Y so I changed to the boring head to finish the hole to size.
Now I have to change the set up to do the remaining operations. another lesson learnt.
Brian
First a blank of the correct width but over length was cut, then fitted on the mill to drill the holes for the big end screws.
this was then cut off to make the end cap.
The cap blank was then trimmed to the correct length and the surface of the rod blank trimmed.
The thread's were cut 4mm and the two parts reunited, then mounted on the mill, and the edge finder used to locate the center of the hole for the big end bearing.
Using the slot drills in 4 stages the hole was opened out to 16mm. BUT when I measured the hole it was 15.5 Crap new Chinky slot drill *****x?
Luckily I had not moved the X Y so I changed to the boring head to finish the hole to size.
Now I have to change the set up to do the remaining operations. another lesson learnt.
Brian
B
BRIAN
Forum Guest
Register Today
Thanks Micke it's nice to know someone is enjoying my work.
Brian.
Brian.
B
BRIAN
Forum Guest
Register Today
Getting further on with the con rod after drilling the small end The rotary table was set up with a pin to locate the small end and the radius milled.
After altering the set up the shoulders of the big end were shaped by first milling out the area then using the boring head to get to the final size.
Having got the two ends done the sides can be taken to size.
Now it just needs a clean up and the bronze big end bush made.
Will soon have to order more material, but I am trying to get all I require in one go to limit postage costs.
Brian.
After altering the set up the shoulders of the big end were shaped by first milling out the area then using the boring head to get to the final size.
Having got the two ends done the sides can be taken to size.
Now it just needs a clean up and the bronze big end bush made.
Will soon have to order more material, but I am trying to get all I require in one go to limit postage costs.
Brian.
- Joined
- Apr 23, 2011
- Messages
- 2,477
Oh theres more than 1 enjoying your work Brian...........
I am very impressed with this!
cheers Phil
B
BRIAN
Forum Guest
Register Today
When I cut the material for the rod I had a small piece left over Just right for the intermediate gear, so I made a gear cutter and dashed off a quick gear. it seems to mate with the lathe gears ok so we will see when I make the other two.
So that's another job to do.
Brian.
So that's another job to do.
Brian.
