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12-05-2016 #1
Yes, that would do it. I have gone with direct drive on the quill and do not over drive it. The fine feed goes through a clutch while the backlash on the lever is too much for CNC.
https://emvioeng.com
Machine tools and 3D printing supplies. Expanding constantly.
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12-05-2016 #2
Good points, thanks.
By direct, I gather you have the screw nut coupled to the front where the depth-stop used to sit?
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12-05-2016 #3
It's slippery slope and quickly your into it $$$ before too far to stop.!! . . . Don't Do it Listen to John S.
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12-05-2016 #4
awww, bum, damn that cold hard logic JAZZ ;)
In my defence, it would pretty much fit in with exactly what i want though!
So, the alternatives then -
Find a donor machine and hopefully just fit the electrics?
Downsides I can see...
space - nowhere to put it.
would like a big table again - this seems to mean a big machine (see point above)
transport costs
unknown wear & tear
different tooling probably
This seems not too bad, but its bed is quite small, although it does have an ATC - would that be the sort of stuff to search for???
http://www.ebay.co.uk/itm/1821213470...%3AMEBIDX%3AITLast edited by Davek0974; 12-05-2016 at 06:08 PM.
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12-05-2016 #5
Yep I'd take that every time over converting BP.
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12-05-2016 #6
Hmm, looks like a no-go then - it weighs 4,500kg and has a 7.5kw spindle - i could not get that sort of power in the shop and anything much heavier than BP would be a bitch to get into place.
The bed is poor too - 500x600 not much bigger than my mini-mill!
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12-05-2016 #7
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05-10-2016 #8
Something that rarely gets mentioned...Power required...
I have a 3ph 2.2kW spindle motor on a vfd, 700w X servo, 700w Y servo, 400w Z servo, maybe 100w for pc and controller on this machine.
How do i calculate the supply capacity allowing for diversity - it will not be running 100% flat out all the time :)
I know i need to uprate the MCB's and supply cables as the build was originally for the small 1.5hp spindle motor.
Adding up the maximum ratings for all drives gives a figure way more than i can supply :)Last edited by Davek0974; 05-10-2016 at 09:26 AM.
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05-10-2016 #9
A quick mental calc, and I'd say 16A would cover you.
2200+700+700+400 = 4000.
Divide that by 220 gives 18A, or 250 gives 16A.
Power up surges of the drives are likely to give a bigger problem than too much current draw during use.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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05-10-2016 #10
Thanks, so there is no difference in current draw if a 3ph motor is running on 3ph or on converted single to 3ph via a vfd (apart from the internal vfd usage) ??
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