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Dennis,
Well Iv'e been really happy with these dirves http://rutex.com/home/servo.htm,
but they are located in Australia so it takes about a week for them to get
to you. (Rutex also makes a lot of products relating to cutting torch
control, like a torch height controll, I think they would sell you a
complete electronics package, but I don't know cutting torches arent my
thing). It is a stepper driven servo drive, just like the geck 340 http://www.geckodrive.com/products/g340/,
only it is more adjustable, and it runs at up to 200v, while the gecko max
volts is 80. I chose motors from this company http://www.SEM.co.uk/ cause they
have very good DC brush motors that can handle 140v MT30e4-52 it is
available with an encoder attached for a very reasonable price. The power
supply i use is a bridge rectifier http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=FWB-352&type=store ,
power supplies dont get much cheaper than that! The servo drives require a
seperate 24v power supply I got mine off Ebay real cheap 24$. If you need
ballscrews try MSC I have been pleased with their service, and their
price on the 5/8 line of screws is very reasonable http://www.mscdirect.com/IWCatSectionView.process?IWAction=Load&Merchant_Id=1&Section_Id=2002093&pcount=15&pbegin=0&RestartFlow=t as
for linear rails Techno Isel makes some good stuff (Techno also has
ballscrews), and very inexpensive for what you get http://www.techno-isel.com/default.htm .
Here is a motor control tutorial from Motorola, I think it is one of the
broken links you were referring to http://e-www.motorola.com/collateral/MOTORPRINTUT.html .
-btw- there is about 3 years worth of research in these links so
consider yourself about that much ahead of the curve now. If you want all
my links relating to cnc control let me know and I'll email them to
you
Lamar Davidge
-------Original Message-------
From: emc-at-nist.gov
Date: Monday, February
25, 2002 09:16:25 PM
Subject: intro and a
few questions i have recently joined this list and have been scanning the archives to glean info. i am planning my jump into cnc with a bdi. i am an semi-experienced linux user and have had the fortune to use high end machines (puma lathe, hurco mill, ...) i have the basic gcode knowledge. as far as linux goes, i am able to patch, compile and install source packages. i do ok at basic scripting. surprisingly, my concerns are not about getting the emc/linux combination to work, its the other stuff. i have been scouring the archives of the yahoo cad/cam/dro list as well, but so far i have not had any luck figuring out the last bits. if anyone can help me get over this last hurdle, i would appreciate the guidance. my first project is to build a gantry type table to use with either a cutting torch or a plasma cutter. i have most of the mechanical tidbits figured out, and i am hoping for an overall size of about 4'x4'. 2d for sure, maybe 3d to adjust torch height, and i am thinking that i want a coolant off/on type function to control cutting function on/off. its not unlike the cnc router type affairs that i have seen, only for metal. 1. is the torch on-off really another axis? can anyone suggest an means of control. it would be a simple off/on solenoid type control. 2. the only other thing at this point that is holding me back is the motors. stepper or servo or chopper type. i tried a couple of the links to the stepper motor tutorials, but they seem to be dead. can someone point me to a resource or faq for them? 3. lastly, the whole notion of torque ratings of the motors. again, pointers would be great. i don't think i need gorilla torque or speed.. i am looking for 10-80 inches per minute travel. i have been scouring the scrapyard for motors, and surprisingly enough, i see A LOT of them, but havn't been able to identify my needs. again, i know this is mostly a dedicated emc list, but i am hoping someone can point me in the right direction to get over these last remaining hurdles to get going. thanks in advance dennis . |
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