Re: [CAD_CAM_EDM_DRO] Smallish CNC Miller

Go with servos. I have a set of the Rockford rolled ballscrews and they are very nice conversion kit. Everything that is needed is included. Take about two hours to install. The tolerance is .003" per foot. And that is a tolerance not a guarantee they will be out that much. Even if they are its only .00025" per inch of error.

Ron

xj5373 <ian.c.haynes@...> wrote:
Hi Folks,

Firstly thanks a lot to all the people who replied to my first post.
I learned a lot from the replies and a lot more from all the other
traffic in the group, thanks again.
I may regret this decision but based on the info I have gleaned I am
going to attempt a conversion of my Bridgeport.
The strategy is to firstly get hold of some software for a play.
Based on what I have read and seen I conclude pragmatically that
Mach2 looks a good choice, the manual alone is a great piece of work.
Step 2 is to get some servo motors working on the bench. Gecko 210s
seem to be a good choice for the drives but I could do with a bit of
guidance on stepper motors. Nema size 34 motors look like the right
choice for the X and Y motion (might hold off on Z until X and Y are
installed) but there seem to be options within this spec. I am UK
based so any suggestions for suitable suppliers and more specific
spec would be welcome. Radio Spares do motors 2.5V 4.5A with a
holding torque of 2200mNm (part 440-470), Mclennan have other options.
What do you think about a break out board between the PC and the
Geckos? Not strictly necessary I understand but useful?
With things working on the bench I plan to start work on the machine
conversion. I have purchased Chris Bruno's (what a helpful guy!)
manual which looks like a great place to start and like the idea of
still allowing manual operation. Conversion to ball screws seems
essential especially as my Bridgeport is a little tired and I am
following this up with a UK supplier. I have not managed to find a UK
supplier of a ready made conversion kit and may yet fall back on
Rockport assuming they are willing to ship at a sensible price.
So there we are, the journey has started, my data file is filling up
and the hunt for hardware is on.
Any other words from the wise would be most gratefully appreciated.

Ian







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