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toolpath creation problem or wrong interpretor setup?
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jagco1998
I am using the Surfcam 2d free version. When I import the dxf and
lay out the toolpaths for the contours and pockets, they all simulate fine within Surfcam. But when I go to cut the part with Master5 or Turbocnc, it tries to start motion from the bottom and center of the stock which is not possible considering a piece of metal is there! When I zero the machine at the center and top of the stock and start the first set of pocketed arcs, they cut the way they should. But when it rapids to the second set at safe Z on the opposite side of the part, the machine starts to plunge into the stock diagnally about 1/2" from the actual plunging position, which caught me off guard and snapped a very expensive little end mill off at the shank ;( The part origin is set at X0 Y0 Z0. And the manual for Surfcam says that you can set the part origin wherever you want to but it doesnt say how. Maybe Im missing something. But shouldnt I be able to make the first move thats in the code,where it starts from the origin 0,0,0 ,and move the machine to X0 Y0 and safe Z(1)before starting the spindle in motion and be able to continue the cut from that position without problems? How do I do this correctly, because Im obviously doing something wrong. I am hoping someone can help me figure this out, as Ive spent alot of time and a pretty sizable chunk of change converting my machine and buying the software to do this work.And Im really anxious to put all of my hard work to good use. Thanks. Regards, Jim |
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Can you post the g-code as part of your message assuming it is not a huge
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file? That would make it a lot easier to understand what is happening. Tim [Denver, CO] ----- Original Message -----
I am using the Surfcam 2d free version. When I import the dxf and |
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jagco1998
Tim,
I would love to but its of a prototype that I've designed and I'd rather not take the chance of somebody stealing my idea before I get a chance to build it. Would it help if I posted the first 10 lines or so?Because Im guessing that's where the problem is. I just dont know enough about Code to pinpoint the problem. Regards, Jim --- In CAD_CAM_EDM_DRO@y..., "Tim Goldstein" <timg@k...> wrote: Can you post the g-code as part of your message assuming it is nota huge file? That would make it a lot easier to understand what ishappening. start ofthe first set of pocketed arcs, they cut the way they should. But shankthe part, the machine starts to plunge into the stock diagnally says;( doesntthat you can set the part origin wherever you want to but it firstsay how. 0,0,0 ,andmove thats in the code,where it starts from the origin spindlemove the machine to X0 Y0 and safe Z(1)before starting the withoutin motion and be able to continue the cut from that position alotproblems? How do I do this correctly, because Im obviously doing machineof time and a pretty sizable chunk of change converting my putand buying the software to do this work.And Im really anxious to all of my hard work to good use. |
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j.guenther
Here's a suggestion for you, set 0,0,0 on your machine to be a couple of
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inches above the part, single step through the program to find the point that it goes crazy and then post the code up to that point and one or two lines after the offending code so we can take a look. That should give us a the info we need to help you and protect you at the same time. John Guenther 'Ye Olde Pen Maker' Sterling, Virginia -----Original Message----- |
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Jim,
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Lot's of us willing to help, but we can not do it blind. If the problem definitely occurs in the first 10 lines for sure, seeing them will help. If you are not sure how much of the code processes before the problem than it will just be wasting everyone's time. I am sure you can understand that we can not help you a whole lot from just a general description and no specifics. All I can suggest is to try using a different G-code viewer program. If it displays correctly in a couple of them the problem is likely in the machine and/or software set-up. As some general suggestions, I like to run the part program without having a cutter in the spindle or material on the table if I am not sure what is going to happen and especially on a new machine/software/CADCAM package/etc.. Then unless you are REAL sure you have all the spindle control codes and required dwells for the spindle to come up to speed I would just turn the spindle on before I start the program. Also I will cut the part from wood or foam when I have made any major changes or am using a brand new setup. Another thing I do when there are lots of changes is drop the feed override down to a real low value and/or single step through the program. This will also help if you think you may be experiencing lost steps. Taking a machine and software that you are not intimately familiar with and knowing what it will do and combining that with G-code that you are not 100% sure of and running it with metal and nice new cutters it a great recipe for broken tooling. Welcome to the CNC club. It is the fastest way to destroying tooling that I have ever experienced. In my case it is virtually always a case of idiot at the switch. I have learned that if I can not buy 2 or 3 of the same cutter to just not get it at all. Nothing like having a drawer full of spares to keep you from breaking an end mill. Having only one of a size almost seems to be an invitation to a learning experience. Tim [Denver, CO] ----- Original Message -----
Tim, Addresses: OFF Topic POSTS: General Machiningaol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ |
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Alan Marconett KM6VV
Hi Tim, Jim,
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Yeah, like the 7BA carbon steal tap (from England) I just broke! And I was being nice to it! I'm milling the cylinder for a Stuart steam engine. I decided to also mill a "practice" block (CNC comes in handy for all those holes). It has "more conventional" threading. 5-40? Right. I probably have a dozen each of the conventional 4-40, 6-32, 8-32 etc. taps, and I THOUGHT I had 5-40 taps and dies. Never found a single one. Easy enough to pick up, but in a similar error, I also THOUGHT I had a stockpile of 5-40 allen head cap screws. Oh well. On the CNC, another thing that could get you in to trouble quick is drawing the part in one orientation, and needing to have the "setup" in another orientation. Also, having the drawing origin different then a convenient point to "touch off" on the work piece. Alan KM6VV Tim Goldstein wrote: <SNIP> |
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Jim Brown
As I said, Im new to all of this. So using Surfcam is a bit confusing considering they give you very vague documentation of all processes. But Im learning. And what I cant figure out.........Ive always got the great CAD_CAM_EDM_DRO group to steer me in the right direction.
I didnt realize that I should be doing the toolpaths in the minus Z and use the top of the part as Z0. DOH! Art brought this to my attention in the Master5 group, but Ive yet to try it.(Actually I didnt know that I could cut in minus Z, so I never thought of trying it) Also Tim... removing the G43,G49's worked flawessly. Thanks for the suggestions. Thankfully I had enough sense to buy more than one of those endmills, so I have a few spares to break yet. And ALan.....I had to draw the part in one orientation. I drew the toolpath offsets in 2d in Solidworks and imported the DXF into Surfcam for toolpath creation.probablt could have done it easier, but Im learning . Maybe I'll figure it out sooner than later! Regards, Jim Alan Marconett KM6VV <KM6VV@...> wrote:Hi Tim, Jim, Yeah, like the 7BA carbon steal tap (from England) I just broke! And I was being nice to it! I'm milling the cylinder for a Stuart steam engine. I decided to also mill a "practice" block (CNC comes in handy for all those holes). It has "more conventional" threading. 5-40? Right. I probably have a dozen each of the conventional 4-40, 6-32, 8-32 etc. taps, and I THOUGHT I had 5-40 taps and dies. Never found a single one. Easy enough to pick up, but in a similar error, I also THOUGHT I had a stockpile of 5-40 allen head cap screws. Oh well. On the CNC, another thing that could get you in to trouble quick is drawing the part in one orientation, and needing to have the "setup" in another orientation. Also, having the drawing origin different then a convenient point to "touch off" on the work piece. Alan KM6VV Tim Goldstein wrote:
Addresses: FAQ: FILES: Post Messages: CAD_CAM_EDM_DRO@... Subscribe: CAD_CAM_EDM_DRO-subscribe@... Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@... List owner: CAD_CAM_EDM_DRO-owner@..., wanliker@... Moderator: jmelson@... timg@... [Moderator] URL to this group: OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Your use of Yahoo! Groups is subject to --------------------------------- Do you Yahoo!? Y! Web Hosting - Let the expert host your web site |
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Ian W. Wright
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----- Original Message -----
From: "Alan Marconett KM6VV" > Yeah, like the 7BA carbon steal tap (from England) I just broke! And IThis is one of the mysteries of life - you get crappy taps from England and all the cheap and nasty ones I buy here are from the US!!! There must be a lesson to learn here..... Best wishes, Ian -- Ian W. Wright Sheffield, UK The following added for automatic email harvesters! abuse@... abuse@... abuse@... abuse@... UCE@... abuse@... abuse@... |
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Alan Marconett KM6VV
Hi Ian,
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Sorry! That statement wasn't an indictment of products from England! The truth be known, I probably ran them in too far into what turned out to be a flange, the tap was probably flexing against a surface DEEPER then that which I had drilled. CNC doesn't fix everything! The hole pattern looks nice, 'tho. Alan KM6VV "Ian W. Wright" wrote:
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