The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)

The Craftmans Shop > New from Old

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RodW:

--- Quote from: awemawson on February 20, 2019, 08:26:01 AM ---Rod,

The motivation was to get it back 'as was'

--- End quote ---

Yeh, I got that and its a credit to you that you slavaged a machine and was able to restore all of the failed electronics

--- Quote from: awemawson on February 20, 2019, 08:26:01 AM ---Rod,

and anyway there are some massively powerful servos and spindle drives on this beast that would cost a fortune to replace.

--- End quote ---

LinuxCNC should be able to control the existing motors on these kinds of machines. I certainly agree it would not be viable if you had to replace the motors.

So save that idea for when you buy the machining centre to go with the lathe. :headbang:

People so often think of the limited I/O parallel port breakout boards with home built CNC but with LinuxCNC and Mesa, this can be infinite plus support most of the control panel features and handle encoders and resolvers. There are different options for running servos but even the $200 Mesa ethernet connected 7i76e I use has 32 inputs, 16 outputs, 5 step generators, 4 analog inputs, 2 Mpg inputs, spindle encoder plus an option to add 2 more similar daughter cards before you venture into the onboard smart serial RS422 interface that allows you to daisy chain a whole host of other I/O options.

naffsharpe (Nathan):
Rod, I love your new word. " Slavaged" has to be the best description of refurbishment/rehabilitation of a machine I've ever heard ! Nathan.

awemawson:
Be kind to him, he's an Australian, and spends all day upside down tangled in the corks from his hat :lol:

RodW:
I wasn't sure if Andrew savaged his machine or salvaged it so I had a bet each way :) :)

Its hard to get a good supply of corks these days. Far too much wine in screw tops down here! I think I better go and open one seeing its Friday night here...

awemawson:
I've not been convinced that my setting up of the turret was actually spot on. I suspected that checking the turret rotation setting using a flat lathe tool mounting position and adjusting to be parallel to the X movement wasn't sufficiently accurate, so I made up a test piece.

I turned an accurate 10 mm spigot on a bar end and left it in place in the chuck. Then on my manual lathe I drilled and bored and reamed an accurate 10 mm sleeve in a bit of brass hex. then with a 10 mm dowel pin mounted in a 10 mm end mill holder in tool position #1 offered the two together. If aligned properly the sleeve should slide from one to the other when the X axis is set to zero.

Well as expected it didn't - it was out in X as well as height - so a repeat of turret adjustment was called for.

It was my intention to sweep a DTI round the inside of a VDI 'tool hole' in the tool disk, but much to my surprise I found that the holes are intentionally not round :bang:

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