Parting off in the lathe - Rear Tool Post #1

[@hullygully-3599]

Always enjoy your videos … thanks for taking the time. Parting off often causes issues … so great topic.

[@Workshopfriend]

Thanks for your feedback! Always helpful.

[@andrewdolinskiatcarpathian]

Hello Clive. A very interesting build indeed. Never easy to achieve an aligned hole circle. So many variables to contend with, especially the dreaded backlash. Looking forward to the next instalment. 👏👏👍😀

[@Workshopfriend]

Thank you, Andrew. Yes, for the mating part I reverted to using a rotary table on the pillar drill.

[@tomnorton8218]

Winky's Wotksop did a great one.

[@Workshopfriend]

Thanks, will take a look.

[@willemvantsant5105]

Hi Clive, I use Iscar and Kenna metal parting blades and inserts,fortunately my lathe is rigid enough so parting off is not a problem. Are you using a Mercer DTI? I crashed mine and damaged one of the stylus bearings, 3mm OD, 1mm ID, 1MM thick, managed to buy online, wonder how they make them, barely see them with naked eye.

[@Workshopfriend]

Hello Willem. Thanks for your comment. I thought about going for parting inserts but wanted to first get experience with straightforward turning. Perhaps later. In this video I used a Linear DTI but on my DTI holder for use with the mill I use a small Mercer. I can imagine the insides are very delicate.

[@robeelkhalid8661]

❤❤❤

[@Workshopfriend]

شکریہ!

[@frogandspanner]

Is this necessary? I am not taking the p155, it's that I am thinking of making a new cross slide for my Chinese 9x20, with sufficient depth to take a ball screw, and had assumed that the cross slide surface would not require the same kind of precision as the ways. Should I consider scraping the new slide?

[@Workshopfriend]

I assume you are referring to the cross-slide ways and not the top surface (as I worked on). I reckon that scraping of machined cross-slide ways should only be necessary to ensure that you have a consistent fit over the full length of travel. It may not be necessary. I only scraped the top surface because I didn't want the tool post to distort the cross-slide when booted down.

[@Rustinox]

I made a rear tool post for my small lathe too. It works, but it's not really a win. The problem is in the saddle.

[@Workshopfriend]

I suppose it wasn't easily corrected otherwise you would have fixed it. In a subsequent video in this series poor adjustment of the cross-slide results in a dig in - but, in my case, it was easily corrected.

[@jackwalshjr6373]

Why not use a fly cutter to surface the plate? Less labor and less time.

[@Workshopfriend]

Good point! I don't yet have a fly cutter but I do have a face cutter. However, I reckoned I had more room to shift the clamps on the shaper than on the mill.