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31-12-2020 #21
So started to look at the lathe in a bit more detail today.
The servo motors will be a direct fit exchange, courtesy of some spacers that Gary had already made. I'm not sure if the cables can be routed without taking connectors off (motor and encoder).
The spindle pulley wont work for the new spindle motor. Shaft size is now 38mm whereas on the old DC motor its around 36mm (or the nearest imperial size to that).
Found a replacement pulley / bushing which should work.
Was trying to remove the spindle 'mounting' system, removed all bolts, cant get it out. There's clearly some adhesive in places like a sealant, could be that. I'm hopeful making a adapter plate for the slightly smaller motor should be straight forward - just need to get one of my mills up and running.
I'd like to replace the V belts - any idea on how much work is involved to get them out - do I need to mess with the spindle (hopefully not).
Was fortunate to find a wiring diagram (and some notes) in the door, thanks Gary. Was looking for the limits / end stop but not found them yet - at least the drawing gives a massive help as wires / terminal blocks are marked. I believe these are all hall effect sensors so need to work out how to wire them up. I note too that there is X Coarse Home and X Fine Home marked in pencil, first time Ive seen that ..... will need to work out how to use these.
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01-01-2021 #22
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28-01-2021 #23
So I got 3 of the hall effects working for the X axis.
The Z axis has proximity sensors that didnt look to be working. So I replaced with these.
https://uk.rs-online.com/web/p/proxi...nsors/1885225/
These allow reconfig from PNP to NPN etc. Ive tried them in PNP, controller doesnt like it and the engineering team tell me I cant use them in PNP mode. So reconfig the sensors .... ok, but I need something called IO Link which I dont have and looks to be pricy.
These sensors looked decent and they are short - I dont have a lot of space where they fit (probably 40mm max).
Parameter 21 and 22 (axis menu from memory) allows a change from NO to NC, but the engineer reckons that wont allow PNP to be used.
He has also suggested using a 2803 IC to swap the PNP to NPN, so this might be a cheaper option (not ideal).
Thoughts?
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28-01-2021 #24
I've ordered this - suggests it can take PNP to NPN, so a quick (almost cheap) fix if it works.
https://www.amazon.co.uk/Converter-M...NsaWNrPXRydWU=
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28-01-2021 #25
What is the actual input needed for the controller?
PNP switches to positive, whereas NPN switched to negative.
If the input requires being switched to negative, then PNP won't work, but if the input lets you wire both sides of an opto, then either can work.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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28-01-2021 #26
It needs to draw down to 0V to trigger. Ive ordered that conversion board, hopefully that works.
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28-01-2021 #27
Yeah, that'll need a NPN type input.
That board should do what you need.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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28-01-2021 #28
If you have not made an IO board yet i think it is well worth the money to buy theirs, it will save a lot of work. I think they are about £50. It reduces the chance of damaging the controller by incorrect wiring, the instructions are in English.although i had to ask for the pdf instructions because the one included in the manual was incorrect. I can send a pdf copy of the I/o manual if you wish.
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28-01-2021 #29
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28-01-2021 #30
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