I thought I had better start posting as I am sure I will probably have lots of questions soon. Let me start off by saying that I have never done any CNC work before. I am a woodworker by trade and by hobby and have always wanted a CNC machine. I have also done quite a bit of electrical work, both AC and DC. The AC side is where I'm most confy, though I I have done electronics assembly as well so a soldering iron and small guages don't bother me. Really what I'm saying is that I hope these skills will get me up and running with my own CNC!
As per the title of this thread I'm building a Joe's 2006-R2. Right off the bat let me say Thanks Joe! Very generous of you to make your plans available. I had initially planned on building a JGRO, but Joe's seemed a bit more substantial. My Build does have some minor mods to it. I decided to make the cutting bed as long as possible. Also most of the assemblies I have dadoed together, to help all the pieces lock together, as well as increase the various gluing surfaces. So here's a quick breakdown:
-72" Cutting bed
-Acme leadscrew, 1/2" -8, 2 start
-Dumpster Cnc Anti-Backlash Nuts
-Keling 425 in/oz stepper kit w/ ps, drivers & breakout board
I think those are the pertinent facts. Most of the hardware is ordered and should be getting here soon. I have a stack of parts cut and hope to start assembling soon, as I'm building without a CNC most of my parts do not have all of the various holes cut, I plan on doing several alignment assemblies to get all the bearings and rails aligned so they don't bind at the end of travel. Thats pretty much it, I hope to be able to learn from anyone here willing to to advise. Let me also apologize if some of my questions are profoundly stupid, this is all new territory for me, that being said:
-My head spins when I try to learn about software, there seem to be a lot of options, I'm looking for something free, (don't know how many options that leaves me) I want to be able to cut archtop guitar bodies, guitar necks, ski cores, etc, things that require some relief cutting.
-I have read that resonance is an issue on some machines. I'm worries about this because of my longer X-axis. Have read about preloading the leadscrew, does this require a thrust bearing for long term wear? I've also read about putting another bearing on the carriage near the backlash nut. Should this be a nylon or delrin flange bearing? it seems to me another metal sealed bearing in a location like that would cause trouble?
-I'm planning on dedicating my old computer to drive my machine. AMD socket 939? 1.6ghz?, 4 GB ram. I'm comfortable that the hardware should run the software, should I go into the bios and turn off all but the most basic functions to improve latency?
-Limit switches. Initially I thought to wire two per axis in series. On further thought it seems to make sense to wire two per axis ALL in series, so all movement stops when a limit is reached? Is this to simplistic, will the driver board stop all movement from one input anyway? Is there I good thread on this I could check out, have not had much luck searching that speaks to my level (ignorance). Also home switches.
-I bought a drag chain to keep things clean, I think its like 1 1/2" x 1/2", Is shielding a big concern? It just seems that getting shielded wire bundled per motor will eat a lot of space quickly. Also should I rout the AC for the Spindle separately?
O.K sorry, too much I know, any help is greatly appreciated, I'll try to post some pics. Thanks in advance!