This list is for the discussion of CNC and related topics including CAD, CAM, EDM, & DRO. The list focuses on the construction of home shop CNC machines along...
95858
blackdiver99
Dec 1, 2008 10:03 pm
Search the CNCzone website for deepgroove; this problem and the solution has come up before. Main problem seems to be caused by the z axis gib being able to...
95859
kettletrigger
Dec 2, 2008 12:38 am
Hello everyone, I got tired of sorting through posts in Yahoo groups and decided to create a full-blown forum designed specifically for machinists. There are...
95860
Glenn
g_farquhar
Dec 6, 2008 3:34 am
I have put up on ebay bobcad 16.1 for mills and lathes with training manual, it runs fine in windows 95, 98, 2000, nt and xp. ...
95861
Roland Jollivet
Roland.Jollivet@...
Dec 6, 2008 5:50 pm
Hi All Just joined and first post; I'd like to know if anyone has had any experience with using Aluminium as an electrode? The scenario is that I want to build...
95862
David Speck
dspeck13021
Dec 7, 2008 2:37 am
Roland, The biggest problem that I see is that aluminum is a difficult material to work, with electrically speaking. An insulating aluminum oxide layer forms...
95863
Jim Fleig - CNC Servi...
jcf611103
Dec 7, 2008 10:25 pm
Hi Roland, I have never seen aluminum used by my edm customers. I don't know the edm process well enough to say why. If aluminum is readily available and...
95864
andrey@...
essexjewelers
Dec 7, 2008 10:51 pm
Hi Roland, It's a good thing you asked before trying this at home. You may wish to spend a little time reading up on Aluminum's chemical properties. ...
95865
Mike
mpericks
Dec 8, 2008 2:36 am
... steel. Sounds like a job well suited to a plasma cutter. Mike...
95866
Glenn
g_farquhar
Dec 8, 2008 4:11 pm
here http://www.mcmaster.com/ Brass .01 x 12 x 12" $9.56ea part number: 8956K15, you can even get it as thin as .001...
95867
Bob Butcher
bbutcher85
Dec 9, 2008 12:43 pm
One problem with aluminum as an electrode is oxidation. I have used aluminum before, and the result can vary. For DC power, it aluminum is used for the...
95868
eugenelambe1
Dec 12, 2008 4:05 pm
Anybody out there interested in the above, either to buy or to trade for other other items. Thanks eugene lambe...
95869
Yahoo
phil_mattison
Dec 12, 2008 5:31 pm
I've often heard this warning (after finding out for myself the hard way) but have never seen an explanation why. Any takers? -- Phil Mattison...
95870
wotisname
Dec 12, 2008 5:47 pm
Hi, The reason is very simple. Magnets need a keeper plate to stay magnetized, some magnets loose their magnetism quicker than others dependent on the material...
95871
Danny Miller
oznog2002
Dec 12, 2008 7:32 pm
I don't understand. Keepers are there to prevent demagnetization that takes months or years... and the modern materials like neodymium do not self-demagnetize...
95872
John Dammeyer
jcdammeyer
Dec 12, 2008 10:55 pm
Hi, I have an excelon drill file created by my Protel PCB software. Would someone be able to run this file through a converter to turn it into a G-Code file...
95873
wotisname
Dec 12, 2008 11:45 pm
Hi, I have a book here that deals with building a coil and using it to magnatize the ignition components of a Ford Model T, not exactly a new machine using...
95874
Yahoo
phil_mattison
Dec 13, 2008 12:31 am
I figured it was something like that. I suppose if you had an iron plug the same size as the rotor you could slide it in as you remove the rotor and maybe not...
95875
John Dammeyer
jcdammeyer
Dec 13, 2008 12:58 am
That would be an interesting experiment. Good idea. John Dammeyer...
95876
Jim Register
jimr8797
Dec 13, 2008 1:15 am
... The rotor is the permanent magnet; you'd need an iron/steel tube to slide it into, I think. Jim Register...
95877
Jon Elson
jmelson2
Dec 13, 2008 4:21 am
... I have such a program, if you have a c compiler, it should work. It may only produce the right output if the Excellon file was made with 2.3 format (ie...
95878
Alan Rothenbush
alanrothenbush
Dec 13, 2008 5:58 am
I bought a copy of DeskPCB a couple of years ago (and still haven't used it). It's supposed to open an Excellon file .. I'll happily give it a go for you ... ...
95879
Peter Homann
homannp
Dec 13, 2008 7:12 am
Hi John, I use sheetcam to do my conversion. I have also used a text editor as well. It didn't take too long. Cheers, Peter. ... -- ... Web:...
95880
carbonsteelsam
Dec 13, 2008 6:26 pm
If the magnets are of the rare-earth "super" variety (neodynium, boron etc) they absolutly do not need a keeper. I have purchased several hundred of these...
95881
Denis Casserly
dcassyc1
Dec 13, 2008 6:43 pm
HI Phil, I've heard 2 ways that steppers lose their magnetism. First has to do with the amount of current flowing through the stator windings. I think if it...
95882
Mike
nowitstaken
Dec 13, 2008 6:45 pm
Seems odd that they would demagnetize so easily. Can't argue with fact but I have successfully taken a stepper apart and am currently using it without any...
95883
Denis Casserly
dcassyc1
Dec 13, 2008 6:56 pm
HI Phil Oops, I fubarred, looks like the rotor is the permanent magnet and that's what has to be slid into a keeper as the rotor comes out of the stator. I...
95884
Alan Rothenbush
alanrothenbush
Dec 13, 2008 7:28 pm
... I'll happily swap you for one of mine taken apart in a moment of curiosity. It still steps, but with NOTICEABLY less torque and gets CONSIDERABLY hotter...
95885
gcode fi (hanermo)
hvenermo
Dec 13, 2008 8:22 pm
So, guys, what about a bog-std treadmill motor ? Can they be taken apart, or not. Permannet magnet DC motor, surplus center, 130 V DC. I was advised yes, I am...
95886
Leslie Newell
les_locost
Dec 13, 2008 9:28 pm
I have never had any problems taking DC motors apart. I admit I haven't taken my treadmill motors apart but I can't see why they should be any different. I...
