Thread: New member from South Africa
I'm James Mitchell, a 47 year old computer programmer from South Africa. Thanks for all the great info here on myCNCUK! Decided to take the plunge and and build a rigid CNC router exclusively for cutting aluminium parts. I have a 2.1m x 1.4m x .15m commercially build router that I have been running for the last 5 years and I need (no, want :-) ) something better for machining aluminium. Something like a Datron M75 would be first prize but that's never going to happen so my specs/ideas for the build are something as following:
Cutting area: 600mm x 450mm x 150mm.
Linear guides & ballskrew (I have Hiwin 15HGH 900mm, 750mm and 350mm rails & blocks and 4 x Chinese 1605 ballskews so I'm going with that)
Expected performance: Speed is not a great issue and I'd be very happy with 4000mm/min rapids with decent acceleration and hopefully 1000 - 2000mm/min for cutting.
I'm really hoping for great accuracy and repeatability. Not sure how to quantify but lets say <0.2mm tolerance on smaller parts
Construction will be steel or Alu
Weight is not a big issue as I plan to use decent sized motors and drivers.
I'm a bit in information overload mode at the moment and I'm having a hard time deciding on a good design. Fixed gantry or moving gantry etc but I'll start asking specific questions later.
Welcome from another colony under the southern cross!
I cannot recall many(any?) fixed-gantry builds on here, but these may help you make a running start:
Deisel's fixed-gantry = http://www.mycncuk.com/threads/6516-...8872#post48872
Jonathan's moving-gantry = http://www.mycncuk.com/threads/6484-...strong-machine
Wellcome to the site. For your uses and the machine size I feel sure that fixed gantry is the way to go. Good luck. G.
Thank you much gents, I'll certainly have a look at those threads!
Considering the copious amounts of aluminium that goes into some of these builds I'm curious how much aluminium costs over there? Here its +- ZAR 75-00 per kg (EU 5.50/kg) for thick sheet type material. Specialized extrusions is more expensive and often sold per meter not kg.
Hi mitchejc welcome to the forum
sounds like steel might be your best option.
Thanks, yep I really like the look of those nice alu machines but steel is likely to be my best bet.
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