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Thread: Medium size CNC lathe?
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4th Nov 2021, 01:08 PM #1Diamond Member
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Medium size CNC lathe?
Someone asked me about machining some camshaft blanks. Up to 80mm diameter. There are plenty of machine shops that could handle that,
...but was wondering if anyone knows of an old CNC lathe being scrapped?
I would only need something that could support a live centre about 700mm away from the chuck, so I can rip into the lobe sides.
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4th Nov 2021, 08:34 PM #2Diamond Member
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good luck, machine tools are in short supply, and prices are wayyyy up, and anything getting scrapped will be $$$$ to fix. I have been looking for a VMC for home and everything that comes up is either too old and flogged or too expensive.
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4th Nov 2021, 08:56 PM #3Diamond Member
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Old+Flogged is OK. This job is only rough turning, so parallelism and surface finish are secondary.
- I know of an old Okuma LB-15 II buried in a warehouse,
but they are only 60mm in the spindle. - Someone told me that large machines are often just cut up for scrap value,
because they are so difficult to move.
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5th Nov 2021, 05:49 PM #4Gear expert in training
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https://www.machines4u.com.au/view/a...-Lathe/491241/
1m between centres, 80mm spindle bore, 15HP, $15k.Gear cutting specialists and general engineers www.hardmanbros.com.au
Fine pitch gear cutting from 0.1 Module www.rigear.com.au
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5th Nov 2021, 07:10 PM #5Diamond Member
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A large machine would be something that is multiple crane lifts and truck loads to shift, and it mainly manual machines that are getting the chop as they are obsolete. A lathe up 1.5M swing and 3M between centers fits on a semi and can be lifted by a franna.
Trouble with Old CNC's is the electronics tend to fail, and its gets very expensive to repair (the exception to this would be fanuc because they are so common and tend to be very reliable).
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15th Apr 2023, 03:28 PM #6Diamond Member
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Took a while, but your luck eventually worked!
Found a $1000 project lathe:
IMG_4103.jpg
470mm swing, 80mm hole in the spindle:
IMG_4106.jpg
Gearbox looks beautiful. Very little wear:
IMG_4108.jpg IMG_4109.jpg
Sadly, no controller, no driver electronics for what looks like DC motors, no carriage lubrication pump, missing some covers, and a cracked ball screw end casting:
IMG_4110.jpg
A few mysteries to work out, like what this is for:
IMG_4107.jpg
and why there are 6 wires in the 3Ø motor:
IMG_4104.jpg
Current plan is to attach a Masso touchscreen controller.
If that is capable of driving DC motors, try to work out drive electronics for what we have.
Otherwise, new large steppers and drivers.
Probably no spindle speed control (VFD) for now, as a 7.5kW motor would need a big device?Nigel, from a cave FULL of unfinished projects and lost tools.
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21st Apr 2023, 10:24 PM #7
Yep looks like a project alright.
Inter to watch how it comes along.Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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