cg_slotcars
Plastic
- Joined
- Mar 4, 2019
Hello
I have a quick question (because what I'm doing doesn't seem to work!)
I'm turning small wheels for model cars out of 6061t6. Picture to something similar below..... I want to make half a dozen at a time - so my first move was to put the bar in a mill and create 6 holes that will later be tapped for set screws.
I put the bar in my lathe and turn the outside shape - no problems although it took me a while to get the setup rigid...
I have a gang tool post I put on the lathe that has a drill, a cutoff blade and a boring bit (Kaiser thinbit) It's flat faced - about .1 wide with a .007 radius at either corner on it to hog out the inside of the wheel.
Everything works great until the boring meets the hole for the setscrew - then it starts to vibrate violently! Most of the failures were breaking off the inside hub on the left of the picture. I went back and made sure everything was still rigid tried again and I broke the bit holder...(not the bit!)
So the first question is - Should it be fine to traverse through a hole when boring? If the bit is grabbing the edge of the hole - should I use a larger radius - maybe grind some relief behind the boring bit(?). I could drill it after? Whats the preferred way to do this?
Thank you!
I have a quick question (because what I'm doing doesn't seem to work!)
I'm turning small wheels for model cars out of 6061t6. Picture to something similar below..... I want to make half a dozen at a time - so my first move was to put the bar in a mill and create 6 holes that will later be tapped for set screws.
I put the bar in my lathe and turn the outside shape - no problems although it took me a while to get the setup rigid...
I have a gang tool post I put on the lathe that has a drill, a cutoff blade and a boring bit (Kaiser thinbit) It's flat faced - about .1 wide with a .007 radius at either corner on it to hog out the inside of the wheel.
Everything works great until the boring meets the hole for the setscrew - then it starts to vibrate violently! Most of the failures were breaking off the inside hub on the left of the picture. I went back and made sure everything was still rigid tried again and I broke the bit holder...(not the bit!)
So the first question is - Should it be fine to traverse through a hole when boring? If the bit is grabbing the edge of the hole - should I use a larger radius - maybe grind some relief behind the boring bit(?). I could drill it after? Whats the preferred way to do this?
Thank you!