Haynie
Member
I have recently started drilling on my metal lathe. I don't have a chuck for the wood lathe yet.
My problem is, when I get finished drilling the hole is larger than the drill bit. Not a lot but enough to see daylight between the tube and the blank.
I thought maybe there was an issue with my head/tail alignment so i locked in a dead center and a live center matched them up and they touched nose to nose. There is not a lot of throw for my Jacob's chuck so here is my procedure.
Set drill in chuck (tail stock)
put blank in 3 jaw self centering chuck (head stock)
Slide tail to just touching the blank.
Tighten tail stock
start drilling backing out a lot
When I run out of throw I back out the bit and turn off the head
Slide tail until bit into the blank until is touches then back out a hair
Tighten the tail stock
drill
Could
I usually have to do this procedure a couple times before the blank is drilled.
Am I doing something wrong? This same bit on the drill press makes a hole that is perfect for the tube. It slides in no problem but no light shines through.
I have come up with two thoughts
1. Since these are PR blanks the PR is getting hot and maybe expanding
2. My Self centering chuck needs a good tuning.
Any thoughts?
My problem is, when I get finished drilling the hole is larger than the drill bit. Not a lot but enough to see daylight between the tube and the blank.
I thought maybe there was an issue with my head/tail alignment so i locked in a dead center and a live center matched them up and they touched nose to nose. There is not a lot of throw for my Jacob's chuck so here is my procedure.
Set drill in chuck (tail stock)
put blank in 3 jaw self centering chuck (head stock)
Slide tail to just touching the blank.
Tighten tail stock
start drilling backing out a lot
When I run out of throw I back out the bit and turn off the head
Slide tail until bit into the blank until is touches then back out a hair
Tighten the tail stock
drill
Could
I usually have to do this procedure a couple times before the blank is drilled.
Am I doing something wrong? This same bit on the drill press makes a hole that is perfect for the tube. It slides in no problem but no light shines through.
I have come up with two thoughts
1. Since these are PR blanks the PR is getting hot and maybe expanding
2. My Self centering chuck needs a good tuning.
Any thoughts?