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CNC / Re: My CNC Router
« Last post by vtsteam on July 10, 2025, 10:27:36 AM »
 :wack:

A waste. I can achieve the same effect with a screwdriver bit. Basically it's a matter of applying high enough RPM at the start of the extraction process. I find I can use the same bit for this for thousands of screws.  :thumbup:
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by Joules on July 10, 2025, 10:22:26 AM »
A cheapish logic analyser and big bunch of resistor arrays ?
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 10, 2025, 10:13:51 AM »
And in some cases the digital outputs will be quite dynamic. For instance the 8 bits shown as '1's ' on the above picture are the data bus that the PLC uses to talk to the SMCC card that is a slave PLC that controls the tool turret - wheels within wheels comes to mind!
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CNC / Re: My CNC Router
« Last post by Joules on July 10, 2025, 10:12:12 AM »
Using a milling cutter to drive in wood screws leaves them tamper proof 🤪
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 10, 2025, 10:06:00 AM »
So now I need to devise a way of testing the outputs. Presented as two cables again terminated in 37 pin D Sub connectors so compatible with the break out board. And again the PLC diagnostic allows me to see what it thinks that it's outputting (it's a Q word) :

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However the way (I think) that the PLC works is that it maintains a table of these bits that is updated by the PLC program and every cycle of the program the table is copied to the Q outputs.

This means that if the PLC program is running anything I write to the outputs will be overwritten in milliseconds and if the PLC program is NOT running I can't access the diagnostic facilities so a bit of a catch 22 situation.

I can do a somewhat less stringent test by reading a particular Q word and checking what is actually set but I'm not convinced that that's good enough?

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Off to scratch my head a bit !
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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 10, 2025, 09:54:40 AM »
So over the last few days I have checked all 96 input lines by temporarily connecting them one by one to 24 volts and using the PLC inbuilt diagnostic tools to display them on the monitor.

Still a bit of a pain, and involves a lot of walking as the terminations are on one side of the machine with the control panel on the other - and yes it's a long way walking round it that gets 'old' very quickly. Still two days spent and I've convinced myself the ALL the input are working fine - now there are several unused inputs but I decided to test them all:

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New from Old / Re: The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
« Last post by awemawson on July 10, 2025, 09:47:01 AM »
Perhaps the summer heat has got to my brain but I've decided to resume testing to try and get this CNC lathe back on it's feet.

A full re-load of known good software still gives me several very odd error reports from the PLC inbuilt to the Sinumerik CNC control so I decided to step back a bit and do some basic hardware testing:

The PLC has 96 inputs (24 v Active 0 V Inactive) and 32 outputs of 0v or 24v. Up until now actually testing these is a physical pain - they are presented at the top of a rack with five cables terminated in 37 pin Sub D connectors - all tightly lashed together.

However a nifty 37 way Sub D break out board turned up on eBay with male and female connectors and a terminal strip allowing me far better access.

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CNC / Re: My CNC Router
« Last post by vtsteam on July 10, 2025, 09:39:28 AM »
Little known fact Joules. An ordinary screwdriver can serve as a milling cutter.
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CNC / Re: Warco and DDCS V3.1
« Last post by vtsteam on July 10, 2025, 09:33:37 AM »
Owning a round column mill builds character.

A round column mill is the mother of invention.
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CNC / Re: My CNC Router
« Last post by Joules on July 10, 2025, 03:18:01 AM »
Steve, where do you get those fancy cutters that can do draft angles as in your photo ???
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