I'm looking for someone in Calgary that has a larger lathe that can chuck up a 5" backing plate.
The backing plate only threads onto my lathe with about 2 1/2 threads. I'm thinking I would need just over 1/8" taken off to make things a little safer.
Thank youView attachment 11688
In addition make a spacer that fits over the spindle register.. It will keep thing a bit more true than the threads by themselves.Just thread it on your lathe with the spigot facing out and then then face it down to the right depth.
From what I understand the fine cast dust is very abrasive and everything needs to be cleaned afterward.I have never cut cast before and understand it can be very messy
Both of those plus the threads (they act as a really steep taper). I believe if you want to take the chuck off and then have it go back on exactly right then the red surface is the most important. It’s the most difficult to fit though and unless you bore it yourself tends to be a bit loose. The green surface ensures things are square. It along with the threads will get you pretty close.Nice work. I've never really understood the mating surfaces of screw on adapters when it comes to seating. Is contact confined to the larger face (green) or does the inner lip (red) also come into play?