On Monday, March 12, 2012 03:19:15 AM Michael Haberler did opine: > Am 12.03.2012 um 02:52 schrieb Steve Blackmore: > > On Sun, 11 Mar 2012 13:23:06 -0500, you wrote: > >> I just included it in the Wiki. I was going to do this a while ago > >> ... but like other things.. > >> > >> Here is the link: > >> http://wiki.linuxcnc.org/cgi-bin/wiki.pl?ManualToolChangeMacro > >> > >> I included it on the main wiki page - look for "tool change" > >> > >> I believe this is accurate. Several people have used, or actively > >> use this, and I haven't heard of any issues with it. > >> I have not used it myself yet. But I could see where it could be > >> very useful in certain circumstances. > > > > It's absolutely necessary if you use tools in a collet where you can't > > guarantee the tool length will be the same each time you load it - > > makes the tool table useless. > > > > Other alternative is a separate file per tool which is a very poor > > solution. > > > > Or the smart arse answer given was "build an active tool length sensor > > and probe it"... > > If you had tried my suggestion instead of opining in armchair mode you > would have figured this wasnt "smart arse" but actually a working > example, which is trivial to change to touchoff from tool length > sensor. > > -m > And which, if the workpiece is insulated so it can be connected to the G38.2 probe pin, can be done directly from the pcb itself. My problems when doing it that way are related to the head to post ways, which if not drowned in vactra at the start of each board file, have a tendency to stiction and move in approximately 0.0015" increments when going down slowly. If I move it fairly rapidly when going to cutting height from clearance height, that is much less of a problem. The problem does cause some irregularity when using the G38.2 move to slowly probe the pcb surface with the tool. It should be worn in by now, but I am beginning to suspect that gib strip is also bent, there seems to be some springyness to the last 1/8 turn in the gib adjusting screws.
Ditto with the cross slide gib on my lathe, its a long way from dead straight yet, needs lots more time on a sheet of 600wrd on my surface plate. Next time I take it apart, the cross slide itself will also spend some time there, I think that puppy is warped! Eventually I hope to get rid of the rubber under the toolpost holder. There is more in that QC holder, and I would love to be able to buy one of those made of steel, the alu version, even with a hollow machined in the bottom so the bolt actually does a bit of the bellevue(sp?) washer number to the posts bottom when pulled down tight, does not stop it from rocking on the compound, and those alu holders can also spring open, burying the bit in the work just about the time you are hitting the end of the motors torque making a _real_ cut. I put out the word over at the landfill a few days back that I am in the market for a discarded treadmill that I may be able to salvage the motor and controller from. Told him the phone call was worth a $20. :) Buying these toys is very educational because you get the basic castings without instructions on how to fit them so as to make an actual working piece of machinery out of them. It has been shall we say, a continuing education course, with no promise of a graduation date being scheduled... I did get the taperlock hub finished and assembled on the lead screw drive motor yesterday and it appears to be running dead true, with plenty of grip on the motors shaft to get the job done. Next is to finish the mount design so I have a few thou of gear mesh adjustment available. > > related: using a tool length switch with manual toolchange - see the > > example in > > > > configs/sim/remap/manual-toolchange-with-tool-length-switch/ > > > > you need to run master for this > > > > - Michael > > > > Steve Blackmore Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Hey, wait a minute!! I want a divorce!! ... you're not Clint Eastwood!! ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
