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Messages - 30t000

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31
General Mach Discussion / Newbie homing problem/question
« on: July 05, 2009, 10:21:17 AM »
I have no homing switches on my lathe so I use a slip gauge between the chuck and the platten type toolplate . The problem I think I am having is trying to set the machine coordinates to 50mm . When I get the slip fit , I then set the "Z" home . This puts the DRO to zero . If I try to type in 50 mm directly into the DRO , it goes straight back to zero , but part coordinates are then set to 50 mm . I have tryed setting the Homing/Limits G28 to +50 and then -50 and back to zero again . What I want is the machine coordinates to be set at 50mm when the slip fit is achieved and for the machine coordinates to verify this instead of zero .
Any ideas on my situation would be gratefully received . Thank you .

32
FAQs / Re: 125 tcl conversion newbie
« on: June 07, 2009, 11:49:00 AM »
I changed the pulse width without to much of a result I'm afraid .

Also on another subject , i think I have some backlash in my Z axis . I have put in the relevant amount and tried different % to get the backlash taken up before each move but without success . All that happens is the stepper starts to move , then slows and then catches up again . Any ideas ?

33
FAQs / Re: 125 tcl conversion newbie
« on: May 24, 2009, 05:36:51 AM »
OK HOOD will do . I have not got a clue as far as these things go , soooooooooo what will increasing the pulse width do ? (in idiot terms if that's ok) .


34
FAQs / Re: 125 tcl conversion newbie
« on: May 23, 2009, 11:06:15 AM »
Well there you go .

Thanks for the input Hood . I tried the numbers you suggested but unfortunately they were not right for some reason . Probably on inspection at some point it will be the leadscrews I expect . I have not managed to get to them so that I can definitively say what they are . They were measured approximately and I thought that was good enough . Never mind .

The original settings were set to :- x 200,2500.2,500 1,and a 0 . Z was set to 200,1600,175,1 and a 0 .

Now the x steps is 200.133  and the Z is 199.9879 . These were derived by moving the axis 5mm , 10mm and 15mm at a time and reading off the measurement on the DTI . I then multiplied the steps by the amount of intended travel , and then divided the result by the actual distance travelled . This was done quite a few times until I got consistent results . I have a small amount of backlash in the system , but that out was taken prior to the measured move .

The only problem I have with the Z axis drive now is that at 50mm a minute feed , the motor seems to miss an awful lot of steps . Any other feedrate and I get damn good consistency . Any thoughts on this would be gratefully received .

I now need to make a toolplate for my TCL125 so that I can get to mount some tools and get cutting . HOORAH .



                                                   

35
FAQs / Re: 125 tcl conversion newbie
« on: May 17, 2009, 08:39:28 AM »
Ruddy hell !!!! That was quick . Thank you very much for that , I will try it tomorrow when I get home from work . I will let you know how I got on . Triffick .

36
FAQs / 125 tcl conversion newbie
« on: May 17, 2009, 05:47:55 AM »
Hello everyone ,
I have wanted a small cnc lathe of my own for some years now . I use several at work and want to get my son in to this quite rewarding topic . I bought a 125 TCL last year but unfortunately it did not have the BBC to run it . I gave it to a friend of mine who has made his own breakout board for it and has got the lathe running in a very basic manner for me to setup as is needed .

My first question is about setting up the units for the X and Z axis . Apart from the board that has been added , the machine is bog standard . I think the leadscrew is 8mm dia with 3mm pitch . The pulley on the leadscrew is 20 teeth and 16 teeth on the motor pulley . So if I do the sums this comes to 0.4166 . I am assuming the motors are 200 step but I do not what the drivers are set up for . From here I get a bit lost . Can anyone help me with the next couple of steps please ?

Thank you for looking .

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