Your doing the classic BIGGER IS BETTER approach and that's a sure fire way to waste money and build an under performing machine. Digital drives won't make any differance if they are sized wrong and mismatched to screws.
Even with the stuff I suggested I recommend you use Digital drives but this as nothing to do with giving more power but more to do with being smoother running and resonance handling capabiltys.
The Following User Says Thank You to JAZZCNC For This Useful Post:
http://www.mycncuk.com/forums/gantry...eady-eddy.html the breakdown was roughly this;
spindle + vfd £1000
I've listed the spindle/vfd seperate bacause most people here seem to buy the Chinese 2.2kw model but I went for an Elte spindle and ABB vfd.
Last edited by EddyCurrent; 06-05-2014 at 08:48 AM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
as for the bigger is better approach; no, I just want a good solid reliable machine and I'm willing to invest the time and effort in researching the best equipment - you guys seem to know what you're talking about, and I'm just trying to understand the reasoning behind, which for all intents and purposes you've so far done well to justify.
My general philosophy when it comes to building stuff is to keep it simple and functional, I hate things that are over engineered unnecessarily.
So with the machine, I would like to use only the best possible parts for the required cutting area and material.
based on what you've told me (and off the top of my head)
profiled rails are best on all axis.
20mm ball screws on x, 16mm on y and z.
the ball nuts should be reinforced more than I have.
the position should be better placed, to avoid chips and being knocked
i should use digital drives correctly sized and I should not get poor motors with high inductance. (Have to get the maths out for the lads!!!!)
the bed should be adjustable, so when I cut alu, I should be as close to the y gantry as possible.
to help reduce resonance, I should use pullies this will also enable me to adjust ratios...
pitch on the ball screws should be 10mm on x and y and 5mm on z...
And dont waste money - unless I really want to ;)
did I miss anything?
the PC to machine interface
breakout board / spindle speed control
Emergency stop / limits / homing switch strategies
the rest of the electrical stuff like power supplies, what voltage to use, amps required ?
the spindle and cooling system if water cooled
the variable frequency drive
type of wiring to use
cable drag chain
fan assisted cooling of control panel
software to use, Mach3, Linux, other ?
material and construction of bed surface.
must be something I've missed now ?
Last edited by EddyCurrent; 07-05-2014 at 09:17 PM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
with a name like eddy current... no wonder you've listed everything Electro-related :) so far, i can find a Foucault with your list... excuse the worst pun ever!
Jazz mentioned the nema 23 motors... These CNC kits seem cheap... What's the deal with them? Are they any good?
When it comes to this side of the machine, I have to admit, I'm a bit lost thus far...
eddy current - you mentioned you spent 1500 on electrical... What was your breakdown? Or shopping list?
Last edited by Jonathan; 07-05-2014 at 10:51 PM.
The Following User Says Thank You to Jonathan For This Useful Post:
You don't want regulated power supplies, linear type are best for this application.
Last edited by EddyCurrent; 08-05-2014 at 08:43 AM.Spelling mistakes are not intentional, I only seem to see them some time after I've posted
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