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Messages - 30t000

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21
General Mach Discussion / Re: Lathe losing steps I think
« on: November 08, 2009, 11:07:14 AM »
Yes i'm afraid I have to agree . The trouble is I know nothing of that sort of thing . Indeed the machine was sorted out with the original Z80 based board removed and a completely new board constructed . It seems a shame to remove it and replace it with new gubbins , but hey , needs must I suppose . The only problem I would have is sorting out the spindle drive etc . But I suppose I could always ask . Funnily enough I thought the problem was with the existing kit , so I am already in the throws of getting things priced . But for now the machine is good to go even if it is a "tad" slow .


22
General Mach Discussion / Re: Lathe losing steps I think
« on: November 08, 2009, 07:01:49 AM »
Gadzooks!!!!!!!! Me thinks me azzit !!!

Just put the speed to 350mm/min and run everything fine . Very slow but fine . Thanks again hood .

23
General Mach Discussion / Re: Lathe losing steps I think
« on: November 08, 2009, 06:10:29 AM »
Right . I have tried all combinations of pulse width and dir pulse but to no avail , so I have reset both to the original setting .

After a couple of changes the program and machine ran fine to a predetermined stop in the program . However when I rewound the program , and started the program with the axis at a different start point , the problem arose again . Badly .

Whilst writing this reply I had a thought and I have just checked the original brochure for the machine and have found that at 100% feed , rapid traverse rate is 350mm/min , and programmable feed rates to 300mm/min .

Me thinks I will try again .

24
General Mach Discussion / Re: Lathe losing steps I think
« on: November 08, 2009, 04:35:46 AM »
Once again a quick reply . Thanks once again Hood . I shall go and try it now and let you know .

25
General Mach Discussion / Lathe losing steps I think
« on: November 08, 2009, 04:08:11 AM »
I have a Boxford TCL125 lathe which uses the standard drivers and steppers .

If I program using feed/rev the machine constantly loses steps and I have to re-home . If I use feed/minute and use a feed of 600mm/min the machine behaves ok and repeatability is great .
Anything over this and either axis may play up . I know 600mm/minute is slow , but at the moment it is what works .

The confusing thing however is that if I jog reasonably quickly the machine behaves . Is Mach3 doing something under program that I am missing or could it be the hardware ? Mechanically the slides and ballscrews have no detectable sticking points that I can notice moving them by hand . Any help would be appreciated .

26
General Mach Discussion / Re: Setting tool offsets
« on: July 14, 2009, 01:20:17 PM »
When I use the mills at work (CNC of course) , tool 1 is the probe and all tool lengths are set to that . Where as the the lathes are set to a defined point on the machine . Both work , but being a turner predominantly , I prefer the latter . I will give both a try and see what happens .

 Thank you to the pair of you .

27
General Mach Discussion / Re: Setting tool offsets
« on: July 13, 2009, 12:47:42 PM »
Once again I find the answers coming freely . Thanks again Hood and also thank you Jim (I presume) . Unfortunately I find the tool screen is full of information and buttons that do not (seems to me) make life easy . I think the designers have tried to cater for all possibilities and in doing so have messed with my simple head . Not complaining , but sometimes more can be less .
I think I got it covered using the turning and facing tool as a reference and then setting the other tools to that tool as suggested by Hood . The problem I foresee is if you take away the tool and replace it with something else . Then I would have to set all the tools again relative to that one . I would like it where I set the tools up once relative to something ???????? and then it will not matter what tool is changed . The tool library can then stay the same no matter what facing turning tool I use . If that makes sense .

28
General Mach Discussion / Setting tool offsets
« on: July 11, 2009, 11:53:59 AM »
Hi again everyone,
     I am having a spot of bother trying to set tool offsets . I use fanuc all the time at work and have tried to set the offsets in a similar manner to them without success . I have included a couple of pictures to help give you all an idea on what I am obviously doing wrong .
     The sequence is to home the machine with a 4" slip in both the "X" and the "Z" . The "Z" is set between the chuck face and the edge of the homemade toolplate (101.6). The "X" is set to 203.2 as I am in Dia mode . I then set the "Part X Zero" to zero and do the same with "Part Z Zero". I do not seem to have a problem setting the "Z" offsets , but the "X" is really getting to me now .
     The machine is using a rear tool post as can be seen with the spindle running clockwise looking towards the tailstock and the insert upside down . If I move the drill (tool n°2) in to "X" zero after setting the offset , the part DRO does not also correspond to "X" zero . The same happens with the turning tool . To my mind , the "X" axis datum should never move .
     So can someone be kind enough to explain in really basic language how to set the offsets please . The screens are all as standard if that helps .

29
General Mach Discussion / Re: Newbie homing problem/question
« on: July 08, 2009, 01:30:59 PM »
Well done you 2  ;D. I have now got it sussed thank you . I love the great support on this forum . I am slowly but surely getting my machine to a happy place for me . I program , set and operate several different machines at work and slowly I am getting closer to the point where I can use "my" little machine as well as I can them , thanks to everyones help . I have got a few more details to sort out , and then I'll be as happy as a pig in *#%t .LOL.

30
General Mach Discussion / Re: Newbie homing problem/question
« on: July 05, 2009, 12:17:08 PM »
Thank you once again Hood . Just tried that and it works as you said . Spot on .

What should I do with the "X" ? If I use for instance a 100 mm slip to get my top slide to its biggest diameter , do I then put in to the "X"Home off 200 or 100 ? I presume it will be 200 ?

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