I am curious about bigger machines, anybody tried making something with a 40
taper spindle. I am halfway done with my own design, using servos, linear
scales, linear bearings and ballscrews. I am trying to keep the BOM under 20k
and of course I am using EMC. Its work envelope is 800mmx500mmx500mm vertial
machine and I am trying to build it with simple tools and machines that are
smaller and less sophisticated than itself.
I would love to connect with anybody that has relevant experience
Jorge
----- Original Message ----
From: Doug Metzler <[EMAIL PROTECTED]>
To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>; [EMAIL
PROTECTED]
Sent: Friday, March 14, 2008 1:35:27 AM
Subject: Re: [Emc-users] home-mad CNC machine project.
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I’m on my third rev of my home-built
CNC project. My best advice is to make it much more rigid than you think you
need to. I started out with small slider shafts and now I’m up to 7/8”
(which you can get surprisingly cheap at speedymetals). But in my case every
rev got considerably bigger. The first rev was a little 8*11 PCB cutter and it
had ¼” sliders, the second rev grew to 11*17 with 3/8’s and the
latest rev will be a whopping 20*34”, thus the need for the huge
sliders. But definitely err on the side of over-engineering for rigidity.
The other part that I couldn’t
afford that I wish I could have was good linear bearings. I tried many times
to come up with my own linear bearing surface but in the end most of the
available
torque was spent trying to overcome the sliders. I still can’t afford
good linear bearings but my latest home-brew setup uses small standard bearings
(some of which are spring-loaded). These are a bear to manufacture but will
dramatically
increase the quality of the machine.
I am using threaded rod but it makes for a
very slow machine. If anyone here has a line on good inexpensive ballscrews
please let me know.
As for electronics I am doing it all
myself because I want smart nodes. But I think the consensus here is probably
right – spend the money to save the time.
Drop me a note if you have specific questions.
DougM
From: [EMAIL PROTECTED]:[EMAIL PROTECTED] On Behalf Of seth wiley
Sent: Sunday, March 02, 2008 1:10PM
To: [EMAIL PROTECTED]; Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] home-madCNC machine project.
sean,
i'm slowly (in my very spare sparetime) working up a small(12"x12"x3") low
tolerance cnc machine for light wood andplastics. it is also serving as a
general teach-myself-cnc project. i chose togo with a pre-config'd electronics
/ servos package from keling inc.
(http://www.kelinginc.net/ThreeXCNCPackage2.html).after reading lots of cnczone
entries and doing lots of chipset / board /wiring research, i figured it's 329$
well spent by saving me time, and it's apretty complete set of items for a good
price. also, this site has some helpfulinfo on wiring
(http://www.robertguyser.com/).i am next building up the machine using basic
8020 or minitec extrusions andlinear accessories. lovejoy couplings will round
out the basic bom. i'll usewhatever i have as a cutter head - dremel, trim
router, etc. it should turn outto be a fairly cheap machine without eating up
too much time reinventing thewheel. cam environment: emc2 packaged with ubuntu.
it was a smooth install
andthe forums are great. so, i cannot say that this route is flawless and
workedout yet since i'm still in the process, but i can say that i've spent a
bunchof time running cnc machines, spent lots of time reading everything i
couldfind on the internet and printed about various diy cnc options. i think
thisroute seems like a pretty efficient and solid starting point. i'll let you
knowhow it comes out - if i ever get the time to complete it!
have fun regardless of which direction you choose. good luck.
-seth
On Fri, Feb 29, 2008 at 10:59 PM, <[EMAIL PROTECTED]> wrote:
I was wondering if anyonehas ever tried a do-it-yourself CNC project like
this.
http://www.instructables.com/id/Easy-to-build-CNC-Mill-Stepper-Motor-and-Driver-ci/and
this
http://www.instructables.com/id/Easy-to-Build-Desk-Top-3-Axis-CNC-Milling-Machine/.
If so, any pointers or words of knowledge before I dive in?
Also, I'm still looking for some stepper motors to use if anyone has a
goodsource.. I'm a college student, so I'm obviously broke andstarving. So,
inexpensive would be good. Thanks guys.
Sean
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