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29-03-2017 #1
Hi Neale,
And you may well be right that this would be the best way forwards! My philosophy for most things is to buy well and buy once.
I suppose I was waiting for someone who has done similar mini mill conversions to come along and say that 68v is overkill for such a machine, and that you would be better using a decent 50v drive - like an EM503 - and a matching 45v PSU. Or whatever. It could save a few of those £s without affecting the performance.
But maybe the kit that is well proven for routers is equally suited to a mini mill? A well trodden path that simply works well. I have to say that the price difference between the EM503 and the EM806 (as examples) belies the much increased current and voltage capabilities of the higher spec drive....
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Plus one on the AM882 route I use them on my mill, lathe and router all on 68V
Last edited by Clive S; 29-03-2017 at 11:12 PM.
..Clive
The more you know, The better you know, How little you know
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30-03-2017 #3
Ultimately it depends on how much performance you're hoping for.
Higher voltage will let you run faster, which on a ballscrew equipped mill of X2 size, probably wouldn't give you much performance gain, as the steppers wouldn't get up to high speed that often.
However, as you'll be using trapezoidal screws, which will have a smaller pitch, and be less efficient, you'll want to maximise torque, and most likely run at higher motor speeds. Which means higher voltage drives could be quite beneficial, but can you justify the extra cost?Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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30-03-2017 #4
Mmm, as ever there is no right answer I guess! What I'm hearing is that AM882's will undoubtedly do the job on both mills, but is it worth the outlay. On the ballscrew mill, they probably wouldn't be used to their potential, and for the trapezoidal mill they may just be overkill for a "cheap" implementation - albeit their abilities may be useful.
So, what would be the next step down, voltage and drive wise? Given that as a data point will allow me to price it up and decide if the saving is worth it?
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