Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: topcat58 on November 21, 2020, 08:43:53 AM

Title: mach3 lathe
Post by: topcat58 on November 21, 2020, 08:43:53 AM

hi all
finished my colcherster bantam conversion
all running fine and accurite,except threading
i have read up so much on this threading but still cannot get it running correctly
whats the point on a cnc lathe if you cannot screwcut
I have a fully licenced mach3

followed various guides,but when i check "use spindle feedback in sync mode"

it will go to start position start spindle but will not screw cut,when i uncheck "use spindle feedback in sync mode"  it will go to start position start spindle but will screw cut but out of pitch every pass

no backlash on ball screws,index counts rpm spot on,X and Z axis are calibrated and accurite ,ive been trying now for weeks with no joy
cannot figure it out

Title: Re: mach3 lathe
Post by: RICH on November 25, 2020, 04:40:02 AM

Have you read "Threading On The Lathe-Mach3 Turn?
What version of Mach3 are you using?
Post the xml file that you are using for the lathe.

RICH

Title: Re: mach3 lathe
Post by: topcat58 on November 25, 2020, 12:52:10 PM

Hi yes i have read Threading On The Lathe-Mach3
Registered to me Version R3.043.062
Using windows 7 32 bit
And Uc400ETH motion controller
Any help would be appreciated
Thanks
Tony

Title: Re: mach3 lathe
Post by: RICH on November 26, 2020, 10:17:11 AM

I am not that familiar with the UC 400ETH and the threading write dosen't address it.  A few of us
addressed a number of questions on this site about it's use / requirements to do threading and remember that it may require an encoder. I do have notes somewhere on the discussions but would need to look for them.

I think you may be better served by going to CNC Drive forum for specifics on using that drive to do threading and exactly what is required along with how to set it up.

RICH

Title: Re: mach3 lathe
Post by: DAlgie on November 26, 2020, 12:04:27 PM

Suggestions for problems... Too high spindle RPM? Start point too close to the start of cut? What RPM are you using and what pitch have you tried? The G76 simple threading wizard works well.

Title: Re: mach3 lathe
Post by: topcat58 on March 21, 2021, 12:52:46 PM

Update on my screw cutting problem “SOLVED”
Finally she is screw cutting in sync mode
All it was was the motion controller uc400eth setting it was set for an encoder which it has
Not got , well chuffed now,just finished a batch of M33 x 3.5 pitch internal and external threads successfully