Here is a starting point.
----- Original Message -----
From: "Chainlink" <dustinyo...@hotmail.com>
To: "Legacy Ornamental Mills" <legacy-ornamental-mills@googlegroups.com>
Sent: Wednesday, July 06, 2011 2:33 AM
Subject: Re: Build log of sorts for a 1200 upgrade to CNC
I had the problem on the Y-axis as well. I'd try and jog one direction
then back and sometimes it would continue on in the same direction.
That's why I thought it may have been a cabling/parallel port
problem.
Also, I'd be willing to try to rebuild from scratch; I didn't find the
construction difficult. I haven't found any plans to help guide my way
though. Do you have any tips to point me in the right direction?
On Jul 6, 2:50 am, "Art Ransom" <akran...@tx.rr.com> wrote:
When slaving A to X, I suspect that your problem is that both motors are
turning the same direction. One should turn clockwise and the other
counter
clockwise. You built one CNC router why not build an indexer from scratch
with the strength needed for the job.
From: "Chainlink" <dustinyo...@hotmail.com>
To: "Legacy Ornamental Mills" <legacy-ornamental-mills@googlegroups.com>
Sent: Tuesday, July 05, 2011 8:24 PM
Subject: Build log of sorts for a 1200 upgrade to CNC
>I thought that after the chat in the All New Members thread that I
> would actually attempt to convert my 1200 to CNC, since it may be of
> great interest to some of the members.
> On one hand, I hate to reinvent the wheel and try to replicate the
> work already done by Legacy; I have a certain amount of guilt about
> this. On the other hand, the CNC upgrade was something like $4000 and
> is no longer offered by Legacy, so I'm going to modify my machine in
> the way that I see fit.
> I'd like to explain where I came from to get to where I am today,
> ready to make this CNC conversion. I was one of the early adopters of
> the Carvewright when it was first released to Sears. The machine can
> do truly amazing work that makes me jump up and down with joy...when
> it works. The other times, and this usually means as soon as I accept
> a paid job for some CNC project, the machine breaks down in some
> obscure way and much swearing ensues, followed by opening my wallet to
> replace parts. In addition to reliabilty, my machine is not capable of
> routing a round hole. Most of my work tends to be vector cuts(wooden
> gears, trophies, etc.), so this lack of precision is disturbing.
> With this dubious history in mind, I decided to build a second CNC
> machine from scratch so that I had a reliable backup that was
> inherently more precise. I decided to build a Rockcliff Model D based
> on the ease of use of the plans and the cheap to make rail system. One
> feature of the Rockcliff D is that it has two stepper motors running
> the X-axis, the A-axis slaved to the X-axis. My machine was built
> entirely out of MDF and I was quite happy with the accuracy of my
> work. Everything was working according to plan until the day I hooked
> up Mach 3 and tested the different axes. During the test, the X-axis
> and its slave moved in opposite directions, tearing the gantry apart,
> ruining the entire build. I think the problem was either the type of
> cable I used(unshielded) to run from the motors or a weak parallel
> port on my PC (though I don't understand how direction could get
> messed up like that, it should have been just missed steps).
> So, there my broken machine sat for a year, $1000+ dollars invested in
> lead screws, steppers and drivers. Now we have arrived at this summer,
> and I had a new CNC project to work on, 6 trophies for the YMCA
> triathlon. I whipped them out on the carvewright and sure enough, it
> broke down with 2 to carve! I managed to solve the problem and
> finished the carvings, but I realized something important. Building
> another 3-axis machine doesn't really help me do anything different
> from my current capabilities with the Carvewright (when it works). My
> money and time would better serve me by adding something new to my
> toolbox, and that is ultimately why I've decided to try to apply CNC
> to the legacy.
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