Author Topic: Cretors popcorn engine  (Read 83976 times)

Offline Jasonb

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Re: Cretors popcorn engine
« Reply #15 on: October 16, 2012, 07:52:08 AM »
Told you so ;)

You could just turn a piece of hardwood to a good fit in the guide and load that up with lapping paste, I've done smaller cylinders that way or make an expanding ali or copper lap.

J

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Re: Cretors popcorn engine
« Reply #16 on: October 16, 2012, 09:07:08 AM »
Rick,

There is nothing really difficult in this game, it is just a matter of trying to remember all the different tricks and processes you can use to end up with the result you want.

It is that wonderful word 'experience' that you will come across time and time again, and by listening to the other members on here, that experience will grow very rapidly if you ask the right questions.

No one is infallible (despite what some people may think about themselves), and because everyone has such a varied range of tooling and machinery it might take you a while to root through the answers you get until what has been suggested matches your way of doing things.

So be very happy when you succeed at getting a good result, as that is a sign you have gained a little more experience.

John

Offline swilliams

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Re: Cretors popcorn engine
« Reply #17 on: October 16, 2012, 10:08:22 AM »
Nice one Rick. It's an interesting thread you've got going here

Steve

Offline zeeprogrammer

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Re: Cretors popcorn engine
« Reply #18 on: October 16, 2012, 11:51:32 AM »
:pinkelephant:  Time for the happy dance.

Please include in the video that I'm sure you'll provide.  ;D
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
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Offline black85vette

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Re: Cretors popcorn engine
« Reply #19 on: October 16, 2012, 01:32:24 PM »
:pinkelephant:  Time for the happy dance.

Please include in the video that I'm sure you'll provide.  ;D

No problem so long as it does not involve wearing a tutu.  :Doh:   You DO still wear yours, right?

Offline zeeprogrammer

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Re: Cretors popcorn engine
« Reply #20 on: October 16, 2012, 04:53:41 PM »
:pinkelephant:  Time for the happy dance.

Please include in the video that I'm sure you'll provide.  ;D

No problem so long as it does not involve wearing a tutu.  :Doh:   You DO still wear yours, right?

Why yes I do. On occasion. What's your interest?  :mischief:
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline arnoldb

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Re: Cretors popcorn engine
« Reply #21 on: October 16, 2012, 07:04:02 PM »
 ;D Happy Dances...  It's been a while since someone's mentioned that :Jester:

Great finish on that flywheel Rick  :NotWorthy: - if anybody ever asks whether it's possible to get a shiny polished finish in cast iron, they need to be pointed to that photo of yours !

I've got a bag of popcorn ready and a chair pulled up  ;)

Kind regards, Arnold
Building an engine takes Patience, Planning, Preparation and Machining.
Procrastination is nearly the same, but it precludes machining.
Thus, an engine will only be built once the procrastination stops and the machining begins!

Offline black85vette

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Re: Cretors popcorn engine
« Reply #22 on: October 16, 2012, 10:43:12 PM »
Wrapping up this part of the crosshead guide.


IMG_5552 by black85vette, on Flickr

My boring head has an R8 end on it.   So I removed it and just chucked it up in the lathe to open up the 1.5" inside diameter.  It needs to be concentric to the bore I just made so I did them together without a change in the mount.




IMG_5555 by black85vette, on Flickr

I put the flycutter in the chuck so I could also finish off the face of the flange to make sure it lines up perpendicular to the bore.

I believe at this time I am ready to remove the mount from the compound.   Think I will leave it mounted until the lapping is complete.   Have I missed anything?   Is it OK to pull it off the lathe?

Offline Jasonb

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Re: Cretors popcorn engine
« Reply #23 on: October 17, 2012, 07:43:23 AM »
It would be best lapped while you have it mounted but that may give you problems if you have to make the lap, at least leave it clamped into the fixture so its not too hard to clock it back true for lapping.

J

Offline black85vette

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Re: Cretors popcorn engine
« Reply #24 on: October 17, 2012, 05:24:01 PM »
It would be best lapped while you have it mounted but that may give you problems if you have to make the lap, at least leave it clamped into the fixture so its not too hard to clock it back true for lapping.

J

If there is a benefit to it I can leave it mounted.   My 7x10 lathe is over at my son's house and I have a big commercial lathe available at my friend's house.  So turning a lap would not be a big issue if that is the best way to go about it.   So, note to self:  make the lapping tool BEFORE starting the bore.  Check!   :ThumbsUp:

Offline black85vette

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Re: Cretors popcorn engine
« Reply #25 on: October 18, 2012, 12:30:24 AM »
While things are still mounted I shot a couple shots of the boring bar and the finished bore.



IMG_5557 by black85vette, on Flickr

Here is the boring bar.  Guess you could use that accurately in a couple of ways.   It is not very exciting is it??   One inch steel with a 1/2" hole in it and a 1/4 x 20 set screw to hold the tool in place.



IMG_5558 by black85vette, on Flickr

Close up of the HSS cutting tool.  Hole is drilled at the same angle as my commercial bar.




IMG_5559 by black85vette, on Flickr

Here is the end result.  None of the wavy patterns or singing I was getting before.   Made several very light cuts and then a couple of passes with no change to the tool.  Ran some cutting oil on the last few cuts.

Offline steamer

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Re: Cretors popcorn engine
« Reply #26 on: October 18, 2012, 12:33:26 AM »
NIICE!!!!!!!!!!

Good job!

Dave
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Offline DavidF

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Re: Cretors popcorn engine
« Reply #27 on: October 18, 2012, 12:49:47 AM »
That's a way better finish than what I got when machining my pm research casting.

Offline jonesie

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Re: Cretors popcorn engine
« Reply #28 on: October 18, 2012, 03:01:10 PM »
 :ThumbsUp: that is a nice job and a good finish. it should not take to much to lap it to finish .  jonesie

Offline black85vette

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Re: Cretors popcorn engine
« Reply #29 on: October 19, 2012, 12:20:49 AM »
:ThumbsUp: that is a nice job and a good finish. it should not take to much to lap it to finish .  jonesie

So with the last success came a happy dance.  Does successful lapping involve a lap dance???  :embarassed:   :shrug:
« Last Edit: October 19, 2012, 04:06:12 AM by black85vette »

 

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