- Joined
- Oct 28, 2014
- Messages
- 23
Hello,
I have been making a small part for the hinges of the garage door - the hinge nails are 12cm long with s 0.5 cm "head" and 11.5cm "tail". The head is 11mm in diameter and the "tail" is 7mm in diameter.
I started with a 1/2 inch rod and quickly machined off the excess material. No matter how hard I tried the "tail" next to the live centre is 7mm but the "tail" near the "head" is around 7.1mm.
I assume the rod is simply bending and producing such a shape? I also got it "fatter" in the middle.
My lathe is accurate to 1/1000 of an inch which is 0.025mm - but my error is 4x that.
My next attempt to get it more accurate is to machine only 6cm of the rod to 7mm, then flip it the other way and do the remaining 5.5 with the 7mm in the chuck -- my first attempt was with the stock 1/2 inch rod that was over 10inches long with all the excess in the chuck. I tried to take light cuts of just around 0.005 inch - around 0.1mm.
I am not sure whatever I could fit any steady rest somewhere in there - the part is only 12cm - less than 5inch.
Suggestions? Or this is the best I can get? I have 12 x 24 gear-head lathe.
I have been making a small part for the hinges of the garage door - the hinge nails are 12cm long with s 0.5 cm "head" and 11.5cm "tail". The head is 11mm in diameter and the "tail" is 7mm in diameter.
I started with a 1/2 inch rod and quickly machined off the excess material. No matter how hard I tried the "tail" next to the live centre is 7mm but the "tail" near the "head" is around 7.1mm.
I assume the rod is simply bending and producing such a shape? I also got it "fatter" in the middle.
My lathe is accurate to 1/1000 of an inch which is 0.025mm - but my error is 4x that.
My next attempt to get it more accurate is to machine only 6cm of the rod to 7mm, then flip it the other way and do the remaining 5.5 with the 7mm in the chuck -- my first attempt was with the stock 1/2 inch rod that was over 10inches long with all the excess in the chuck. I tried to take light cuts of just around 0.005 inch - around 0.1mm.
I am not sure whatever I could fit any steady rest somewhere in there - the part is only 12cm - less than 5inch.
Suggestions? Or this is the best I can get? I have 12 x 24 gear-head lathe.