I'm asking around and trying to get an idea if this would be a good alternative before I present it.
We lathe grey/ductile cast iron parts that have a circumference up to 2 feet and are relatively flat/stubby with features like tenons, bearing bores, and shaft holes, etc.: all needing to be concentric to withing a couple thousands between each feature for the tighter stuff; about 4-5 thou for the looser stuff. Then things like the bearing bores need to have a diameter that's tackling less that a thou on tolerance.
Then we second OP all of these parts in a VMC to add bolt holes, drain ports, grease ports, etc.
Wondering if it would be easier to lay a rotary table flat on the table; not standing upright like most? Add a chuck and now I can mill-turn parts so features are relatively concentric. Others were wanting to circle interpolate these features and I know that's not a good idea.
The idea would likely work in a large lathe with live tooling but figure I have more room to grow in a mill with a rotary. Plus, like I said, we just machine short, flat parts. Nothing long like shafts. Figure a mill with a rotary is also cheaper to maintain than a large lathe with live tooling.
I figure surface finishes would change but that's not a bid deal.
Now we can essentially ditch lathes and just have VMC's. I effectively reduced some of our multiple OP parts to two OPs (one OP for each side verses two OPs in the lathe and 2 OPs in the mill).
Certainly I'm not the first to think of this?
Thanks
We lathe grey/ductile cast iron parts that have a circumference up to 2 feet and are relatively flat/stubby with features like tenons, bearing bores, and shaft holes, etc.: all needing to be concentric to withing a couple thousands between each feature for the tighter stuff; about 4-5 thou for the looser stuff. Then things like the bearing bores need to have a diameter that's tackling less that a thou on tolerance.
Then we second OP all of these parts in a VMC to add bolt holes, drain ports, grease ports, etc.
Wondering if it would be easier to lay a rotary table flat on the table; not standing upright like most? Add a chuck and now I can mill-turn parts so features are relatively concentric. Others were wanting to circle interpolate these features and I know that's not a good idea.
The idea would likely work in a large lathe with live tooling but figure I have more room to grow in a mill with a rotary. Plus, like I said, we just machine short, flat parts. Nothing long like shafts. Figure a mill with a rotary is also cheaper to maintain than a large lathe with live tooling.
I figure surface finishes would change but that's not a bid deal.
Now we can essentially ditch lathes and just have VMC's. I effectively reduced some of our multiple OP parts to two OPs (one OP for each side verses two OPs in the lathe and 2 OPs in the mill).
Certainly I'm not the first to think of this?
Thanks