Gallery, Projects and General > Project Logs
Oh Blimey I bought a CNC Lathe !!!!
awemawson:
Vsteam thanks - water situation resolved late last night. Makes you appreciate it when it comes back!
Yes I always cut pins on DIL packages to remove, then take out individual pins. Although I do have a proper Weller de-soldering station with a vacuum pump my method of choice is to flow the solder - push the pin as far as it will go towards the component side with the tip of the iron, then give it a quick blast from a fine compressed air nozzle. Blows pin and solder clean away leaving a nice undamaged hole but I work on a pad of workshop tissue to contain the bits that come though. In this case the power pins on their massive power planes resisted solderwick, the vacuum sucker and the air blast - I just couldn't get the thing molten all the way through until I went from a #7 Weller bit to a #9 (which is higher temperature. I suppose this is one case where that low melting point stuff in the video above would have come in handy, but it hadn't arrived by then.
Oh and yes I always socket replacement chips !
dsquire:
awemawson
I have been following along since the start of your project on the CNC lathe purchase and process of bringing it back to life. Slow and steady, one step at a time. Think each step through first then on to the next. When you solve the last piece of the puzzle it will be so worth it that we will probably all hear a big
:ddb: :ddb: "YES". :ddb: :ddb:
Good luck with it and I will continue to keep watching. :D :D
Cheers :beer:
Don 3158
awemawson:
Don thanks for the encouragement.
I've reverted back to the 10 slot controller as I cannot overcome the Z58 BRAM failure that I get in the 6 slot. It takes MC465a BRAM cards, two of which give the same failure, whereas the ten slot takes an MC462 BRAM card which has gone in and shows no such issue. I have yet to prove that the input / output addresses appear in the same places and that is tomorrows job with a 'scope and big piece of paper. However I cannot see that the 6 slot is anything other than a subset of the ten slot but I may be proved wrong!
vtsteam:
At the end of the day, I bet it's just one *%$#! line different!
Fingers crossed! :beer:
awemawson:
OK I didn't fancy buzzing out all those backboard lines to prove if the slot addressing in the 6 slot was different from the 10 slot as the experts had told me, so I went ahead and tried it anyway. There are two input output cards and a channel card to drive the additional axis:
MC301 has 64 Digit Inputs and 45 Digital Outputs
MC323 has Analogue i/o (not used in this config, and 64 Digital Input and 64 Digital Outputs
MC652 drives an additional daisy chain interface to the V axis (opposing spindle)
Now I can monitor inputs on built in displays on the controller, but I've not yet found how to drive outputs, but my reasoning goes that for these inputs and outputs to feature at the correct addresses so long as inputs on a card are proved to be in the right place, the outputs should also be ok address wise. Now there is a logistical issue testing this - the controller is on the front, and all the wiring is round the back! So I made up a long test lead consisting simply a single pole switch on one end of a wire pair, and a pair of 'bootlace ferrules' on the other end. A '1' is +24V on this system, so one wire was fixed to +24v, and I sequentially removed a selection of inputs from the termination board substituting my other wire. This way I could watch the interface monitor screen, and toggle the switch and watch bits being turned off or on. All inputs showed up in the right places so I concluded that the MC301 & MC323 backboard addressing must be what the system expected. Now for the MC652 card: Each drive (Axis and Servo) talks along its daisy chained bus and gives its status to the system the same way. Each has a rotary pcb mounted hexadecimal switch to set its 'drive number' on the bus hex 0-E are potential drive numbers and 'F' is unequipped - ie servo amp not used. Sure enough making adjustment to the drive numbers showed up on the appropriate screen of the controller so again I conclude its address as far as the system program is concerned work just as it did before in the 6 slot backboard. So I MIGHT be on a winner. :ddb:
Fortunately all the i/o wires are screwless 'Wago' types that you open and close pushing a fine screwdriver in a hole, so connecting and disconnecting wasn't as hard as it might have been.
Talking of winners, I grabbed some 96 way din connector extender cards on ebay which arrived today. The system has single connector (half height) boards and double connector (full height) boards. In the photos that follow we have:
A/ Single connector extender - can be used unmodified
B/ Dual connector extender - needs slicing up and the connector spacing adjusting
C/ Tripple connector extender comprising three single bolted together with spacers - I may use two of the element of this rather than slice up B/
D/ a shot showing how close to the required spacing the dual extender is
E/ a shot of the now empty and forlorn 6 slot controller
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