Oh Blimey I bought a CNC Lathe !!!!

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awemawson:
It's a nice thought Stuart - by the nature of things no doubt it will be used to make bits for itself and my other machines.

Re 3 metres of 50mm EN8: no specific object in mind. I happen to have (came with lathe) a 48-50 mm 'J56' collet for the main spindle, and needed some chunky material to practice set ups and programming, particularly for the powered rotary tools. This came up locally on eBay so I grabbed it as the price was right.

I'm currently going through the tooling and tool holders, sorting out what is there, what needs fixing, and if I have the correct inserts for the tools themselves. Most driven tools are ER25 collets - I'd swear I had a set but can only find ER11, ER16, and ER32's so a purchase is in order.

The powered tools all need dis-assembly, bearings and seals checking / replacing and a general fettling. Several are partly dismantled but amazingly most of the bits seem to be there.

lordedmond:
Hope you get that pesky tool setting problem sorted ASAP

Stuart

awemawson:
Well I can fairly easily work round it - just a case of writing down the figure it generates, deleting it and putting it back with the decimal point in the right place for each axis.

I decided that I need somewhere to store the tooling so I've started rejuvenating some Versatool cabinets - new thread here:

http://madmodder.net/index.php/topic,8741.0.html

awemawson:

--- Quote from: AdeV on July 14, 2013, 06:31:16 PM ---
--- Quote from: awemawson on July 14, 2013, 10:44:36 AM ---
It's an odd system, to call a tool the 'T' word takes the form Tmmnn where mm is the tool number (which has it's associated tool offset in X&Z from the tool table) and nn is an additional 'Tip offset' which is another table with entries for each of the 80 possible tools. So I suppose theoretically you could use the tip offset for tool 7 with tool 10 by calling T1007 but why you would want to goodness only knows. The second entry seems superfluous as surely you will always use the tip offset for the tool it was measured on.

--- End quote ---

Could the second reading to be to take into account wear? Seems unlikely I'll admit, unless the lathe is capable of resharpening bits (at the expense of length) "on the job".

--- End quote ---

Turns out it's more subtle than that. Re-reading what programming info I have for the umpteenth time I now realise that the second set of values is split : the first 40 (of 80) are for the first tool 'edge' and the second 40 are for the second 'edge' so something like a parting tool can be called up using either edge depending on whether the bar is in the main or opposing spindle, and still get the correct length. However is is also supposed to be used for fine corrections. So you set your tool, put the value in the 'tool table' and use the 'tip offset' to make minor adjustments as you measure the turned part. It's remarkably complicated !

Pete W.:
Hi there,

This question might be a bit premature.

I've watched John's (Doubleboost) latest video this afternoon, the one in which he turns an eccentric section of the component by offsetting it in the four-jaw.

Can machines like yours turn eccentrics by programming the tool to advance and retreat (radially) in phase with the main spindle rotation? :scratch: :scratch: :scratch:

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