On Monday 11 May 2015 06:30:26 andy pugh wrote: > On 11 May 2015 at 03:18, Gene Heskett <ghesk...@wdtv.com> wrote: > > But now I am back to the G7/G8 diffs which are costing me money > > I don't think that anything has changed there. But youmay be seeing > differences related to starting from scratch. > (I don't _know_ that nothing has changed, but I can't see any reason > that it would) > > What you have seen is probably related to touching off a diameter in > radius mode, then moving to a diameter in diameter mode. > (Imagine the tool is at a radius of 25mm and a diameter of 50, you are > in radius mode, touch off 50mm, the machine assumes you mean 50mm > radius / 100mm Dia. > When you switch to Diameter mode and G0 X50 the machine _thinks_ it is > at 100mm dia so plunges 25mm inwards to what is actually 0mm dia) > > Do you use a "reference tool" or do all tools have an offset? I seem > to recall you use some form of touch-off plate.
Not since I put homing switches on it. What I am doing now is the auto home, where the x switch is on the front of the saddle set at about .1mm from the max out travel of a hair over 67mm. The switch will not be damaged if it comes all the way to the end of the slot in the carriage. >From the [AXIS 0] ini file: MIN_LIMIT = -2.5 MAX_LIMIT = 67.0 HOME_OFFSET = 67.783 Those are stated in radius. So the bring up procedure is to do an autohome without a tool mounted as the x will be zero'd & left at switch open, which gives clearance even with a workpiece mounted, for it to go left and find the z switch which is about 57mm from hitting the chuck. And it parks about 25mm to the right of the switch. Since I had already cut the rust off the workpiece, I next drive the mounted tool so that it is sitting in gentle contact with the left end of that cut, touch-off z to 0.0, and measure the OD, in this case 32.3mm, and touch off x, redoing it if the DRO diameter isn't correct. The DRO diameter was showing 32.30. > I think you might need to do some tool-changing, jogging about and > switching between modes to see where you are (and also check the tool > table entries). Tool table not involved, default arrow showing in the backplot. For me to make use of the tool table, I've have to get another $200 in tool holders so I could permanently mount and measure them all. I only have the basic kit of the smallish steel one. OXA series IIRC. Each holder is about $14 and I'd need another half a dozen, and the boring bar holder is $22 & I'd need about half a dozen of those. My BIG bar is a 5/8 diameter that I made a clamp for, but that also leads to buying & fitting more compound-slides as it can and has ripped threads out of the top, 10mm threads. I have been tempted to replace the compound with a steel square of the same height but haven't found my round tuit for tht job yet. Its (the OXA) about 10x more rigid that the alu versions that use the push button driven by a cam to lock a fixed V. The OXA moves the wedge up and down on a ramp on one side, much better grip. > The "exceeds limits" thing can probably be cleared by touching off > again to the right diameter in the right mode. I'm going to give it another shot later today, but with the whole toolpost on the table beside the keyboard this time. But first I need to take the owners manual and go see if I can find a deck drive belt thats about an inch shorter for my 23 yo Craftsman rider. Its an MTD under the paint of course, but by the time the deck is leveled ack the book, the belt tends to come off, climbing above the engine pulley when disengaging. And its a right pain in the ass to restring the thing if you don't have a lift that lets you work from the bottom. I think by now the pulleys (and deck suspension stuff) are worn bad enough an inch shorter belt is the cure. That and call Orkin to get rid of a termite nest in the underpinnings of my shops front deck we found late Friday night while replacing the dry rotted flooring. First things first IOW. Thanks Andy. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
