First Engine No Plans.
- Thread starter HYTECH
- Start date
Help Support Home Model Engine Machinist Forum:
One thing I need to practice with is turning a shaft to size. most of the time I over shoot and go undersized. I did this on the crank mains. and the bearings fit loose so I ordered some bearings from Granger that were undersized and made to be pressfit onto a 0.500" shaft and they fit nicely.
I also need to work on finish passes but I think that is mostly my tooling. (cheap carbide 38 piece kit for $20.00) I just ordered HSS blanks from Enco and am going to try to cut my own. I think this will work better. And Man I need a DRO.
Here are examples of my rough and undersized finish passes. Any pointers?
I also need to work on finish passes but I think that is mostly my tooling. (cheap carbide 38 piece kit for $20.00) I just ordered HSS blanks from Enco and am going to try to cut my own. I think this will work better. And Man I need a DRO.
Here are examples of my rough and undersized finish passes. Any pointers?
Maryak
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Hytech,
A couple of things come to mind
Blunt tool tip not on centre height
Tip radius smaller than the rate of feed
Lack of rigidity - tool overhang to high, job overhang from support centres.
Hope this helps.
Best Regards
Bob
A couple of things come to mind
Blunt tool tip not on centre height
Tip radius smaller than the rate of feed
Lack of rigidity - tool overhang to high, job overhang from support centres.
Hope this helps.
Best Regards
Bob
It's been a long time and I've just got back to this project.
i've changed the cylinder design it was too long and I decided to have 4 studs or long cap screws pass through the cylinder and head. With the last pic you will see it is hard to take pictures with a 21 month old little boy helping, all I could do to keep it out of his hands but we had fun. I almost have the head finished also and will post pics soon
i've changed the cylinder design it was too long and I decided to have 4 studs or long cap screws pass through the cylinder and head. With the last pic you will see it is hard to take pictures with a 21 month old little boy helping, all I could do to keep it out of his hands but we had fun. I almost have the head finished also and will post pics soon
radfordc said:
Oh I redo atleast half of it. Cylinder, piston, This is the second block/crankcase, many valves, camshaft, ECT.. Lots of mistakes and redesigns. I should have put it on paper first.
I am getting quite a collection of cool machined paper weights. When this is done I'll post picks of the parts that didn't make it.
