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Messages - ministeam

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General Mach Discussion / Re: G76 incorrect feed and rapid rates
« on: September 16, 2014, 02:47:46 PM »
i think your problem is you are using 066 version this is not very good for thread cutting , use version 057 to 062 these are good for threading & are available on this site somewhere
i have found it easier to hand code threads rather than use the wizards
this is the code i use to produce a m12 x 1mm pitch internal thread
G0 G40 G18 G80 G50 G90 G95
M6 T1616
G0 X10.80 Z15.00
M3 S550
G76 X12.00 Z-11.50 Q1 P1.00 J0.080 L45 H0.250 I29 C0.250
hope this is of some help to you
all the best

Share Your GCode / Re: Internal Threading
« on: August 01, 2013, 07:13:54 AM »
hi cncalex
i have changed the code as you suggested & it is now working . Thank you for your help
all the best

Share Your GCode / Re: Internal Threading
« on: July 31, 2013, 10:14:20 AM »
hi Alex
thank you for your suggestion i will give it a try tommorrow morning & let you know
all the best

Share Your GCode / Internal Threading
« on: July 31, 2013, 06:17:56 AM »
i have a denford orac cnc lathe that has just been converted to Mach 3 , this is using a licenced version of mach 3 . i have only just started to use this machine after a few problems which with help from other people has now become a reliable machine.
my problem now is internal threading which no matter what i do to alter the code it is still working as though it is cutting an external thread , everthing is working ok with the threading movements
i am including my code below for people to look at to see if they can pick out what i am doing wrong
thank you in advance for all your help

General Mach Discussion / Re: spindle speed problems
« on: February 26, 2013, 02:05:16 PM »
hi angeltech
the inverter is only set to 60mhz , i will change to 100mhz tommorrow when i go to my workshop , i don't know why i put the ratio of .60 but i thought it might be something to do with the ratio of the motor & spindle pulley diameters ? should this be set to zero  . would i get better results if i had a spindle disc with a single slot as suggested by dickeybird

General Mach Discussion / Re: spindle speed problems
« on: February 26, 2013, 12:48:53 PM »
hi angeltech
yes i have set the spindle pulley to 100 to 2000 ( i had it originally set 250 to 1800 ) with the ratio set to .60
the inverter is one that i bought from transwave here in the uk , it is from there economy range  but from a well known manufacture IMO .i have had a good few converters & inverters from transwave peter who does all the model engineering exhibitions is very knowledgeable on the products he sells

General Mach Discussion / Re: spindle speed problems
« on: February 26, 2013, 11:16:09 AM »
hi angeltech
i have changed the motor settings to the ones you suggested & yes the debounce is set to zero , on my first try with the new settings the spindle worked as it should with the s dro showing
1000 rpm  s true dro very erratic with a range of 100 rpm (50 rpm either side of 1000 )  tacho gave a reading of 1000 rpm
i next tried a speed of 750 ,  the s true dro gave a reading of 1000 as above still erratic tacho gave a reading of 850
next i tried 500  , the s true dro gave a reading of 750 , the tacho gave reading of 850 still very erratic
the inverter in earlier tests does like running at low speeds seems it only likes at speeds 500 rpm

General Mach Discussion / Re: spindle speed problems
« on: February 26, 2013, 09:50:25 AM »
thank you for your quick reply i will go into the workshop & try it now
something i forgot to put on my earlier post is is the spindle is driven by a poly v belt & the motor pulley is 40mm dia & the spindle pulley is 60mm dia, would this make any diference to what you have suggested i should try

General Mach Discussion / spindle speed problems
« on: February 26, 2013, 07:55:04 AM »
i am in the process of finishing a total refit  of a 1983 denford orac cnc lathe , all the electronics ,stepper motors & main spindle motor have been replaced with new upto date items .
everything has gone fairly easy until recently when i am trying to set up the spindle & i can't get anything to work properly.if i am in manual mode & using the mdi line put in m3 s500
what i get will something like
S true = 1750 rpm
s box = 500 rpm
but the spindle speed using a hand held tacho = 800 rpm
i have tried the spindle calibration screen , it starts the spindle at 250 rpm & stops at this 30 mins so i stop it because it is going knowwere
everything else is working fine , stepper motors , homing switch's
machine spec
parallel port board , 2 stepper drive boards , spindle board (step & direction converted to 0 to 12v for inverter control ) all these items came from www.diycnc.co.uk these are the system 4 system on his website  , the spindle inverter is an imo idrive - idx 1hp , the motor is a dual voltage 3 phase 3/4 hp 1370 rpm , it has a cnc4pc c3 index pulse board settings are active = low
output = ttl
the spindle index disc has 4 slots with the largest being 12mm wide
i have spent the last 2 days changing settings & try again still no joy
please has anybody any ideas as to what i am doing wrong or something i am overlooking
i am enclosing my xml for you to have a look at to hopefully see my problem

General Mach Discussion / Re: problem with my cnc lathe
« on: February 08, 2013, 01:58:58 PM »
i have had a look today for hood's suggestion & after a lot of messing about still couldn't get it to work i changed the computer & transfered the xml file as well & it then sprung in to action i had got back manual movement . thank you hood for giving me  some idea's to sort this problem

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