grim_d
Unlikeable idiot.
- Messages
- 4,243
- Location
- Scotland - Ayrshire
Gentlemen,
Spurred on by Johns recent videos I have bought myself a er40 collet chuck and a set of collets. My lathe came with a spare backplate so I headed to the workshop this morning excited to mate the two.
Unfortunately I have run into a problem, when trying to face the backplate flat I consistently get a runout of about 0.03mm across the whole face of the backplate, not the end of the world for the things I get up to but I don't understand why and I would like to, as well as making the chuck as accurate as possible.
I have the saddle locked, the compound locked and the cross slide gib tightened up more than usual. Even taking a cut then a few spring passes the result is the same.
With a clock gauge on the piece I was prying at things to try and find movement but I was unsuccessful, barely a flicker, even trying to move the backplate on the spindle resulted in nothing.
I know the bed is not 100% completely level as It does cut a slight taper but I wouldn't have thought this would affect things as I'm not using that axis?
The nose register does has a couple of minor dinks where some haphazard schoolkids have spun on a chuck with a chip in the way, I gave a it a rub with an oilstone but surely taking a facing cut should rectify any runout there? I considered perhaps it was rocking slightly but as above was unable to replicate any movement.
Any thoughts? In my ignorance have I missed something very obvious?
Spurred on by Johns recent videos I have bought myself a er40 collet chuck and a set of collets. My lathe came with a spare backplate so I headed to the workshop this morning excited to mate the two.
Unfortunately I have run into a problem, when trying to face the backplate flat I consistently get a runout of about 0.03mm across the whole face of the backplate, not the end of the world for the things I get up to but I don't understand why and I would like to, as well as making the chuck as accurate as possible.
I have the saddle locked, the compound locked and the cross slide gib tightened up more than usual. Even taking a cut then a few spring passes the result is the same.
With a clock gauge on the piece I was prying at things to try and find movement but I was unsuccessful, barely a flicker, even trying to move the backplate on the spindle resulted in nothing.
I know the bed is not 100% completely level as It does cut a slight taper but I wouldn't have thought this would affect things as I'm not using that axis?
The nose register does has a couple of minor dinks where some haphazard schoolkids have spun on a chuck with a chip in the way, I gave a it a rub with an oilstone but surely taking a facing cut should rectify any runout there? I considered perhaps it was rocking slightly but as above was unable to replicate any movement.
Any thoughts? In my ignorance have I missed something very obvious?