gemellocattivo.com

Which means "Evil Twin". Lets see your projects where you change boring into fun or create the fun from scratch.
It is currently Thu Mar 28, 2024 2:45 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 65 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next
Author Message
PostPosted: Tue Feb 10, 2015 12:25 am 
Offline

Joined: Fri Jan 02, 2015 6:42 pm
Posts: 104
For me this was a brilliant post.
Epic work


Top
 Profile Send private message  
 
PostPosted: Tue Feb 10, 2015 11:50 am 
Offline

Joined: Thu Jan 01, 2015 6:47 pm
Posts: 4251
I love it! especially the setting it on fire part :)


Top
 Profile Send private message  
 
PostPosted: Tue Feb 10, 2015 12:10 pm 
Offline

Joined: Thu Jan 08, 2015 8:17 pm
Posts: 55
You'll be glad to hear I got my phone camera sorted - the lens cover was all scratched so gone are the milky shots.

Brian,


Top
 Profile Send private message  
 
PostPosted: Wed Feb 11, 2015 3:50 pm 
Offline

Joined: Thu Jan 08, 2015 8:17 pm
Posts: 55
Ok, so got these poured,

With the camera in better form shots are better.

Installation of filter in the filling sprue - this keeps out any dross or foreign items present in melt,

Image

The moulds with the cavities above the parting line got drilled for vent holes, because the moulds have been coated with a light wash they become air tight, so, air has to be vented because alloy has not the power under gravity pour to displace the air,

Image

Mould detail,

Image

Glue is applied to lower mould and the top one placed on,

Image

Image

Image

To make the mould form for the spigot that causes the hollow in rear of three bolt flange a piece of pipe is used of correct size with a slit in wall to allow sand core removal,

Image

Cable ties are used to keep ring closed while filling, its gassed and removed,

Image

Image

Another hole is drilled under where the core is glued to allow core to breath its internal gasses into main mould,

Image

Core piece is glued on and smoothed with graphite/zircon filler,

Image

The crucible is charged with small Lm25 alloy ingots,

Image

The moulds are moved to fire board on floor and purged with argon and blocked off,

Image

Cosy,

Image

Towards the end the melt gets a flux pellet to bring any impurities to the top - stirring or touching the melt excessively is bad, you should only really touch it once to drag off dross before pouring in order to leave surface skin intact and therefore protecting the melt from gasses in the atmosphere,

Image

A shot right after pouring, heat causing lines on camera,

Image

After 3min or so the moulds get cracked off with a chisel, no matter how many parts you cast, seeing a newly cast part appearing from the sand is always an amazing sight,

Image

The vents doing their job,

Image

The 3 bolt covers - these were cast face down to allow metal to flow correctly around face - it also means the core can act as a vent at the rear(now the top), keeping the front face unblemished,

Image

Image

The recess,

Image

Image

Closeup of surface finish - I think just one set will do as these are pretty bang on it terms of matching OEM finish,

Image

Group shots, risers + sprues now chopped off. If you look carefully, you can see a tiny nick on the top edge of parting plates - this allows me to know and keep all the 'top' orientations correct from the drawings, to the parting mould plates, and thus onto the parts themselves. This is important as once on the mill I need to be sure the raw castings are orientated as they are on the screen from which I machined the patterns from. Im not sure if the holes are on the same location/pcd, but constantly knowing the 'top' of part means it doesn't matter.

Image

Image

Image

Image

Image

Parts will get a wash now to remove any sand left on and then get milled shortly,

Brian,


Top
 Profile Send private message  
 
PostPosted: Wed Feb 11, 2015 4:49 pm 
Offline

Joined: Thu Jan 01, 2015 6:47 pm
Posts: 4251
Those parts look AWESOME! Great work Brian!


Top
 Profile Send private message  
 
PostPosted: Thu Feb 12, 2015 12:05 pm 
Offline

Joined: Thu Jan 08, 2015 8:17 pm
Posts: 55
mk e wrote:
Those parts look AWESOME! Great work Brian!

They are ok for moulds that not too much moulding science went into.

Onto machining, I left approx .7mm on the faces that needed machining.

A jig was made up with a cutout to fit part outline - the three legs that were the gate/runners on part were drilled and the jig plate tapped to bolt parts from underneath,

The top faces on all got machined flat and then 5mm holes drilled - the actual holes size is 7mm but these 5mm holes get tapped first for fixing parts while machining rear face flat,

Image

Flat,

Image

Image

Image

Part removed, to save jig materials the pocket was milled out to fit the next part,

Image

Image

And again with the largest three bolt parts,

Image

I seem to have not uploaded the rear side milling - will figure out where they went and re-upload shortly :?:

Brian,


Top
 Profile Send private message  
 
PostPosted: Thu Feb 12, 2015 4:40 pm 
Offline

Joined: Thu Jan 08, 2015 8:17 pm
Posts: 55
Thought I had more shots of the rear machining but it seems not,

Anyway, heres a bad one - lighting not yet installed in new cabinet so...

Parts were bolted down rear side up on a piece of ground jig plate and machined, thread holes were then bored out to finish size once bolts were removed.

Image

All done and packaged ready to go, you would normally bead blast after all is done to make all surfaces a uniform sheen and to remove any smut/smoke lines but since I don't do that in house I'm not willing to send just 4 parts out as the logistics wouldn't make it worth while. They are pretty good right from moulds.

Image

So.......thats how you make cast parts for a Ferrari V12 engine!

Brian,


Top
 Profile Send private message  
 
PostPosted: Thu Feb 12, 2015 4:51 pm 
Offline

Joined: Thu Jan 01, 2015 6:47 pm
Posts: 4251
They look fantastic....great work Brian!


Top
 Profile Send private message  
 
PostPosted: Thu Feb 12, 2015 4:54 pm 
Offline

Joined: Thu Jan 08, 2015 8:17 pm
Posts: 55
mk e wrote:
They look fantastic....great work Brian!

Thanks Mark! A pleasure, Ill shut up now and go back to quietly viewing from sideline :lol:

Brian,


Top
 Profile Send private message  
 
PostPosted: Fri Feb 13, 2015 6:04 am 
Offline

Joined: Sun Jan 11, 2015 4:07 pm
Posts: 26
Beautiful
Pete


Top
 Profile Send private message  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 65 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6, 7  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group