Cutting off on a hobby lathe

[RJS100]

Thanks Uwe. Ok, dumb question as I know very little about these. Will these MGGN200 fit in the same holder as the GTN-2 ?

[suntravel]

No you need an DGFH26-2 holder If you are looking for a 26mm blade.

Uwe

[RJS100]

Thanks. I tried to find a 26mm tall blade, but learned that if you mount it on a Aloris AXA tool post, the cutting edge is too high. I ended up ordering a a 19mm tall blade that accepts GTN-2 inserts. I was able to find these inserts that are not coated:

https://www.ebay.com/itm/355588615166

I wish I could have found a 26mm tall blade but was not able.

Richard

[RJS100]

Hello Uwe,

I am about to part off a piece of 6061 aluminum. OD is 1.5 inches with a 1/2-inch hole in the middle. The piece I will be parting off is about .46 inches thick. I am going to try your pecking approach with the tool shown previously. I noticed on one of the videos in this post, that there was a small divot in the center of the part suggesting that your parting tool was slightly above the center. Do you intentionally place the cutting tool slightly above center?

Thanks... Richard

[suntravel]

No, I am setting up the tool height to center height of the spindle.

If the part is not supported with a counter spindle, there will always be a divot on the cut off part.

In some cases, there I do not want the part to fly around, I do not cut off completely and break it off by hand,

Uwe

[RJS100]

Thanks! Wish me luck

[RJS100]

Thanks as always for your help. I was able to part them off fairly easily. For some reason I had to run at a very slow speed of about 150 rpm or I heard noise that sounded like too much vibration. When I slowed it down it went perfectly. The OD is 1.5".

I was able to finish these up on the mill.

Richard

[Stew260]

I would be interested in your speeds and feeds. I have always struggled to part of aluminium on the manual lathe and when i get my CNC lathe running im hoping for better success.

[RJS100]

Hello Stew,

To be honest with you, this is the first item that I parted off. It has an OD of 1.5 inches. The material is 1061 aluminum. I simply pecked my way through at 155 rpm. As I got to the center, I increased the speed slightly. It worked like a charm.

Here are the tools I used:
https://www.ebay.com/itm/351096300582

Uncoated Inserts: https://www.ebay.com/itm/355588615166


This tool holder is better, but it would not fit on my AXA tool post:
https://order.ebay.com/ord/show?orderId ... 8-401443#/

I hope this helps... Richard