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sometimes the easiest answers are the ones that are best :)

my heatsink was not as long as the g540, however it was higher, so I was able to pass screws through under and above the g540 and make a...

I want to mount a heatsink to the back of my g540... but I can't think of a good way to mount it...

thermal goop is not sticky, so that won't work.

anybody have any good ideas?

right now I...

it is a stepper system, but I have to say that I feel like a total moron.

I had a typo in my HOME_IGNORE_LIMITS line.. doh.

anyways, it's working perfectly now.

thanks for the help guys!
-J

I set that to yes... but I'm still getting the limit/joint following error...

-J

I am trying to get a combined limit/home switch configuration working, however when I 'home' the axis, it ends up tripping the limit switch as well...

is there something special I need to do to...

if you're looking to build your first home cnc, like a 4x4 or something, I have a JGro that I would be willing to run the parts on for you.

I'm in Cary, IL...

my max cut size is 24x13, but I...

I'm using a hobbycnc board with stepper motors...

I don't believe there's any encoders there... I'm guessing that EMC just assumes that it moved whatever pulses it sent to it.

sometimes what I...

I tried that, it still doesn't work.

I don't have limit switches. Basically the problem is that I exited axis while the machine was not Zerod.

now Axis thinks that Zero is in the middle of my...

It appears that I can't click the override limits checkbox to allow me to re-zero my machine if I shut down with it in the wrong position.

Is this a bug in 2.2.5 ??? or is there some secret that...

has anybody built a Jgro in northern illinois that might be willing to spend a few hours with me to help me get everything aligned and working properly?

I'd be willing to buy drinks, maybe grill...

I'm in the process of finishing up a jgro right now, and am frustrated with how unstable my machine ended up being... however, it's been GREAT to learn how to use the software and learn about CNC in...

Actually the manuals were really good... much better than most of the stuff I read for my day job.

*after* I read them :) that is.

when I was asking about the reference, i was more looking at...

Heads up...

the Hobby CNC cards don't like twisted pair cabling.

I had some 18ga 2-pair twisted cable that I was using for my stepper wires.
(it's usually used for alarm and home-theater...

well after playing around with stepconf for a while last night, I got things running pretty good.

I'm still having some binding issues here and there, but i think that's more due to machine setup...

... I've built a JGro-type cnc router that's being controlled with a hobby cnc card and their 305oz steppers.

I'm trying to use the emc ubuntu distribution to control it.

i've got motion, but...

ok, so my long wires were the problem. i moved things around in my shop and now the PC is right next to the machine... and it's working pretty good.

I'm still getting a bit of wierd behavior...

... I have a hobbycnc pro rev1 board attached to my pc via a 3 foot cable...

between the hobby cnc card and the steppers, I have 2 2-pair cables for each stepper... they're about 20 feet long...

I've got 18ga cable for the motors to the controller.

upon all the advice, I'm going to put the controller next to the pc and hook it up with the shortest parallel cable I can find.

on the...

I'm in the process of finishing up my home-built jgro type CNC machine.

I have the Hobby CNC 4axis Pro board along with their 305oz motors.

I have a large quantity of 18ga control cable for the...

Is the shielding critical ?

Just curious because I'm getting ready to wire up my jgro.

-J

If you have access to a biscuit joiner you can use that in some places to replace the dowels. I have biscuit joined and screwed a bunch of the parts together, and the strength seems really good.
...

I'm building a jgro right now, and the parts that aren't listed are easy enough to figure out with a tape measure.

one thing I changed was my upper and lower torsion boxes are all built with 3/4"...

can somebody post the max dimensions of the largest cnc cut piece of the new 4x4.

I'm building a jgro right now and would like to make sure that I can cut the new 4x4 pieces on it when I get ready...

any ideas on the price yet for just the materials? Not including electronics?

Thanks!
-J

cool, I might just order from them...
they have the bushings too...

-J

Joe, where did you get your v-bearings from?

I'm starting to lean towards this method more and more and more... especially for simplicity.

-j

You're exactly right about how expensive the v-bearings are... that's why I'm trying to come up with a solution that I can use the gas pipe and roller bearings that I already have on... but I'm not...

I was more concerned with the properties of the aluminum extrusion... the 8020.net's deflection calcuator says that a 60 pound load on a 60" unsupported 1530 says that you'll get a 0.017" deflection....

so... to get back to my original question then...

if I go with V-bearings and angle iron, I should be able to get away with even dropping to 1530 dimension material since the angle iron on the top...

I looked at Ahren's site and couldn't see any linear bearings for rail or shaft...

however, I did see a link over to kelinginc .. they have some linear rod bearings for pretty cheap.

how do you...