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| | |-+  Now that's what I call a lathe
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Author Topic: Now that's what I call a lathe  (Read 947 times)
Brain
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« on: Thu 18 June, 2015 - 11:32 pm »

 


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Red
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« Reply #1 on: Thu 18 June, 2015 - 11:40 pm »

 eek



look at the size of the headstock!
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Mr Nice Guy
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« Reply #2 on: Thu 18 June, 2015 - 11:47 pm »

Cruisey job for two or three days 
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Brain
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« Reply #3 on: Thu 18 June, 2015 - 11:51 pm »

just jump up on the cross slide and check the cut will you...? 

 
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Red
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« Reply #4 on: Fri 19 June, 2015 - 12:03 am »

That rough surface would be hard on the Tips, they must go through a few on a job like that. I didn't have sound, what are they machining?
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Brain
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« Reply #5 on: Fri 19 June, 2015 - 12:17 am »

no description it's out of china.

It looks like it has been forged in one piece to be turned down to final size. Maybe some turbine shaft of something?

Did you see the tip that bloke was holding?
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Brain
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« Reply #6 on: Fri 19 June, 2015 - 12:21 am »


maybe it ends up like this?
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Red
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« Reply #7 on: Fri 19 June, 2015 - 12:23 am »

That's cool!!


would be a bit unnerving for the operator tho.
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Lux
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« Reply #8 on: Fri 19 June, 2015 - 03:55 pm »

 
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Artaxerxes
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« Reply #9 on: Mon 22 June, 2015 - 10:27 pm »

maybe it ends up like this?
Seems a bit wasteful to make the casting round only to have to then cut a lot of material away. It would be easier to make the casting more closely resemble the final shape, and remove only the excess surface material to get down to the right shape and dimensions.

Maybe the top video shows the production of a shaft for a power station turbine, rather than what is perhaps a ship's engine crankshaft in the second video.

Still bloody impressive though. I think the scariest parts would be loading and unloading the workpiece on/off the lathe. I doubt steelcapped boots will save your toes if you drop that sucker!
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Brain
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« Reply #10 on: Tue 23 June, 2015 - 06:57 pm »

It is most likely a forged casting. There is no waste all material removed is 100% recyclable, it will be re-smelted.
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Artaxerxes
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« Reply #11 on: Tue 23 June, 2015 - 07:44 pm »

I think you misunderstood. I didn't mean that the excess material was a waste, but the extra work required to remove it.

I watched some of the video suggestions provided by youtube. One of them showed this guy casting a handgun replica out of recycled aluminium cans, using a sand-enclosed polystyrene copy that melts away when the metal is poured in. That looked relatively easy to do, and could be a neat way to make custom components for DIY projects.
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Brain
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« Reply #12 on: Tue 23 June, 2015 - 07:59 pm »

aluminium casting is pretty easy. I wouldn't be keen on using polystyrene though, the chance of the gas from the melting poly' blowing
the mold apart and spraying you with hot metal is quite high. If done properly a sand mold that doesn't require something to be left inside to make a casting.
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Artaxerxes
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« Reply #13 on: Tue 23 June, 2015 - 09:23 pm »

That method has its drawbacks though. Taking the mold apart to remove the pattern and then putting it back together again causes misalignments or other mess ups, and then you end up having to clean up the finished casting, or it being totally unusable. I've had to clean up castings with internal shapes. They were hard to get at with a die grinder, made it a stink job to do.
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Brain
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« Reply #14 on: Tue 23 June, 2015 - 09:56 pm »

Can't say I've ever had problems with alignment unless the cope was rotated and as long as the sand and cores
are prepared correctly the finish shouldn't take much doing, it just depends on the complexity of the pattern. It's
all fun though.
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