g0602 metric threading

[rusmannx]

i'm all set up to cut threads, but on the "indicator table" (see image below) it doesn't mention metric. i assume this means i use "the others" (1,4,7,11), but if i pick 1, do i have to always use 1 or does 4, 7, and 11 work for the same piece of work?

thanks guys

[RTTIM]

i'm all set up to cut threads, but on the "indicator table" (see image below) it doesn't mention metric. i assume this means i use "the others" (1,4,7,11), but if i pick 1, do i have to always use 1 or does 4, 7, and 11 work for the same piece of work?

thanks guys

This lathe has an inch lead screw, so you don't use the thread dial when cutting metric threads. You have to leave the half nut engaged until the threading process is complete. At the end of each pass you stop the lathe while quickly backing out the tool. You then reverse the lathe to run the cutting tool back to just before the beginning of the thread, reset the tool for the depth of the next pass & make the next cut -all with the half nut still engaged.

Hope this helps.

Tim

[rusmannx]

This lathe has an inch lead screw, so you don't use the thread dial when cutting metric threads. You have to leave the half nut engaged until the threading process is complete. At the end of each pass you stop the lathe while quickly backing out the tool. You then reverse the lathe to run the cutting tool back to just before the beginning of the thread, reset the tool for the depth of the next pass & make the next cut -all with the half nut still engaged.

Hope this helps.

Tim

wow. i would have never guess that, and i don't remember reading it in the manual. on second look, yup, it's in the manual. this seems like backlash is going to be an issue, but at least i have somewhere to start.

thanks!

[HimyKabibble]

wow. i would have never guess that, and i don't remember reading it in the manual. on second look, yup, it's in the manual. this seems like backlash is going to be an issue, but at least i have somewhere to start.

thanks!

Backlash is not an issue, as long as you:

1) Never dis-engage the half-nuts until the thread is complete, and...
2) Use the cross-slide (or top-slide) to back the tool completely out of the thread at the end of each cutting pass, THEN reverse feed until the tool is well past the start of the thread.

Any backlash will be automatically taken up at the start of the next pass, before it starts cutting.

Regards,
Ray L.