But not practical for touch off on thin material...
On 11/12/2012 6:30 PM, Peter C. Wallace wrote: > On Mon, 12 Nov 2012, Tom Easterday wrote: > >> Date: Mon, 12 Nov 2012 19:13:15 -0500 >> From: Tom Easterday <tom-...@bgp.nu> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >> Subject: Re: [Emc-users] Floating plasma torch - asking to share experience >> >> >> On Nov 12, 2012, at 5:56 PM, Yishin Li wrote: >> >>> On Tue, Nov 13, 2012 at 1:06 AM, Marius Liebenberg >>> <mar...@mastercut.co.za>wrote: >>> >>>> I have seen many alternative solutions that all end up being scraped and >>>> redone to floating head. >>>> It is my opinion that the only good and maybe better alternative is the >>>> capacitive sensing THC system. The simpler the solution the lesser the >>>> troubles:) >>>> >>>> The plasma head we worked with is rigid type. We use the torque feedback >>> of the Z-axis servo motor to decide if it is hitting the plate. We called >>> it analog probing. It is useful for underwater plasma cutting. Here's the >>> video: >>> http://youtu.be/amnozqEhRYE >> >> Very nice. This is a feature of Granite servo drives >> (http://granitedevices.com/index.php?q=servo-drive-vsd-e). It is called >> homing to a hard stop. We use it on our plasma machine to home the X and Y >> axes which are driven by Granite VSD-E drives . We have it torque limit the >> servo motors and slow the velocity until the axis runs into a door stop >> (literally) that we placed at the end of travel. When the ferror reaches a >> settable max it then backs up to the index pulse of the encoders. Very >> accurate homing, no switches/wiring required. I never thought of using it >> to do touch off for the torch, but why not? >> >> -Tom >> > It should be noted that this should be possible with any torque mode servo > and some HAL magic. > > > Peter Wallace > Mesa Electronics > > ------------------------------------------------------------------------------ > Monitor your physical, virtual and cloud infrastructure from a single > web console. Get in-depth insight into apps, servers, databases, vmware, > SAP, cloud infrastructure, etc. Download 30-day Free Trial. > Pricing starts from $795 for 25 servers or applications! > http://p.sf.net/sfu/zoho_dev2dev_nov > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Monitor your physical, virtual and cloud infrastructure from a single web console. Get in-depth insight into apps, servers, databases, vmware, SAP, cloud infrastructure, etc. Download 30-day Free Trial. Pricing starts from $795 for 25 servers or applications! http://p.sf.net/sfu/zoho_dev2dev_nov _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
