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JBV
09-05-2005, 01:30 PM
Hello!

I'm planning on building a cnc mill! :) Would like som comments and suggestions!

This seem to be a nice machine, not to expensive (and it's available Here!)
BF 20 Vario (http://www.optimum-machines.com/products/milling-machines/bf-20-vario/index.html)

Pretty good working envelope:
Z-axis travel 280 mm
Y-axis travel 175 mm
X-axis travel 280 mm

Should i go for servos or steppers? What size? What approximate cutting prestatnda would i get in various setups and materials? Is the spindle motor the bottleneck? I have trouble finding sources for good (cheap) servos and steppers in Sweden. So i hope to get some suggestions! :)

Later (when my economy permits) i'm thinking about getting ballscrews. Probably rolled with anti backlash nuts! :P And perhaps a new faster spindle for 5 axis work, with 2 rotary tables. One flat on the table and one behind the spindle.

Best Regards
Johan

an0n
09-05-2005, 01:54 PM
Hello,
What kind of speeds and what kind of material are you aiming to cut is what will dictate servos/steppers and if the spindle is powerful enough.
As far as I know there are no cheap servos anywhere in Sweden the best way to get cheap servos is to buy them in the USA, The shipping is expensive but you get twice as good motor for the same money as motors would cost over here.
/Anders

JBV
09-05-2005, 02:09 PM
Well... I'll mainly will be cutting steel (except for wax). At highest possible speed (Don't know what i should aim for here?) Got lots of projects with looong programs :P

If i go for servo, should i get brushless? With Rutex drives!

//Johan

an0n
09-05-2005, 02:42 PM
The spindle and the machine rigidity will be the limiting factor if you are going to be cutting steel(I WISH I could give you a number but I just cant seem to remember)
As for speed there isnt any real limit how fast you can go if you can crank out enough pulses when you have servos, and your machine/gearing & servo inertia is reasonably matched.
I have no clue about rutex drives, brushed/brushless is mostly a cost issue.

/Anders

JBV
09-05-2005, 02:58 PM
Perhaps i have to do some machine evolution later then... Build a better machine with the first one :D Would be interesting to build a Stewart Platform style mill! They seem to have some big advantages in rigidity and less error accumulation!

//Johan

svenakela
09-05-2005, 05:38 PM
Trying to get servo's in Sweden at reasonable prices are a not just a pain in the butt, it's a got darn pine tree straight up!

Regarding the machine, there are companies here that sells equal machines at equal prices, check out http://www.brannehylte-maskin.se/ and "gamla hederliga" http://www.jula.se if they have something. Otherwise, why not buy an old machine and retrofit?

--S

JBV
09-05-2005, 06:55 PM
I would love to have a bigger machine.. But i have limited space, want to get a lathe too! I don't think the price is to bad in Sweden!

BF20 Mill (http://www.blocket.se/view/5730295.htm?caller=nbl_s&l=0&c=1&city=0) 10900 kr + vat
and
D180x300 Lathe (http://www.blocket.se/view/5730275.htm?caller=nbl_s&l=0&c=1&city=0) 7500 kr + vat

Would these (http://www.transmotec.com/product.asp?cat=9) be usable? Type 086 EMB series! If you just put an encoder on them!

//Johan