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+--- Thread: Mill Engine Cylinder Casting (/thread-724.html)
RE: Mill Engine Cylinder Casting - doubleboost - 08-13-2012
(08-13-2012, 07:19 AM)TomG Wrote: Nice work John. It's been a long time since I've had the fun of machining a casting.
I assume by the blackening around the casting, that you use an oil tempered sand? Is it your own recipe or do you buy it already mulled. And what about flux? I know chlorine type degassers are used for aluminum, but do you also use some sort of flux for the bronze?
Tom
Hi
Tom
I used "petrobond" oil based sand to face the mould backed up with green sand
With clean bronze i dont use a degasser
Even with aluninium if you just stirr it well it seems ok
The commercial de gassers give off real nasty fumes
John
RE: Mill Engine Cylinder Casting - doubleboost - 08-13-2012
Hi
Lads
Did a bit video of my sand cores and cylinder casting
This should give you a laugh
http://www.youtube.com/watch?v=2VnqOhvLuQE&feature=youtu.be
John
RE: Mill Engine Cylinder Casting - DaveH - 08-13-2012
John,
Just watched your video - bluddy fantastic mate.
And I have just watched it again.
It is certainly going to get my vote for an Oscar
Congratulations on a fine and very informative video
DaveH
RE: Mill Engine Cylinder Casting - doubleboost - 08-14-2012
Hi
Lads
Got a bit more machining done on the cylinder
Next job is to mount it on the lathe saddle & poke a hole through it
![[Image: IMG_4104.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4104.jpg)
![[Image: IMG_4110.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4110.jpg)
![[Image: IMG_4114.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4114.jpg)
John
RE: Mill Engine Cylinder Casting - EdK - 08-14-2012
Nice video John! I was enthralled watching it.
Ed
RE: Mill Engine Cylinder Casting - DaveH - 08-14-2012
Looking good John.
DaveH
RE: Mill Engine Cylinder Casting - ETC57 - 08-14-2012
Awesome video John
this is a great project looking forward to the next step
Jerry.
RE: Mill Engine Cylinder Casting - f350ca - 08-14-2012
Looking real good John. Hope someday to try my hand a casting, to many projects too little time.
Curious, why wouldn't you bore the cylinder on the mill?
RE: Mill Engine Cylinder Casting - doubleboost - 08-20-2012
Hi
Lads
Started boring the cylinder
Mounted on the lathe saddle
Body filler is used to plug the end and the centre marked
It is mounted on the face that it will sit on
This should keep the bore paralell with the base
![[Image: IMG_4122.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4122.jpg)
The bottom of the cylinder is held against the face plate this should keep the bore and the botton face in line (note use of tab papers) as a "slip guage)
![[Image: IMG_4149.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4149.jpg)
After a few cuts it was obvious that something was wrong
![[Image: IMG_4154.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4154.jpg)
Sand inclusion in the casting (core sand)
![[Image: IMG_4164.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4164.jpg)
I may as well keep going
![[Image: IMG_4174.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4174.jpg)
![[Image: IMG_4175.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4175.jpg)
Cleaned up at just under 2 1/4 inch
![[Image: IMG_4173.jpg]](http://i261.photobucket.com/albums/ii63/john970s0/IMG_4173.jpg)
Should be ok with one more fine cut when it cools off
I was aming for a bore of 1 7/8 the same as my marine engine
2 1/4 will give it a bit more power
John
RE: Mill Engine Cylinder Casting - DaveH - 08-20-2012
Nicely done John
Sad about those inclusions but you seem to have sorted them out
DaveH