@pete kindly sent me this lovely lump of steel so I thought I'd better show what I've done with it:
Flat one side as it's only gripping by about 1/8" in the jaws
Turn it around so I can start turning the taper.
Another piece of steel from an old sprocket to make the ER25 Collet holder
Bought some (cheap) index tool holders and carbide inserts to try. Let me up the speed and turn lumps off quicker, but for best surface finish I still prefer ground HSS, maybe it's because I only have CCMT 09T304 inserts, maybe it's me needing to experiment some more!
That's the tapers done, Engineering blue to check them on the spindle and just see light trough the gap to pull them up.
Set up on the mill to drill the mounting pin holes.
DRO makes it easy to get the holes in the right place,
thanks to @MBB for the locking screws PCD.
Tapped M10x1 and M6x1 for the pins and locking screws.
Back to the lathe to machine the other side.
and over to the mill to drill and tap the mounting holes.
Job done
Next is turn the collet holder down, turn the internal taper and cut the thread,
but as it's cold in the garage and I'm only allowed 10 photos it'll have to wait for another day.
Why ER25 - that's what fits the mill so I have a range of collect already in that size.
As before, many thanks to Pete for the steel and MBB for the mounting hole PCDs
Flat one side as it's only gripping by about 1/8" in the jaws
Turn it around so I can start turning the taper.
Another piece of steel from an old sprocket to make the ER25 Collet holder
Bought some (cheap) index tool holders and carbide inserts to try. Let me up the speed and turn lumps off quicker, but for best surface finish I still prefer ground HSS, maybe it's because I only have CCMT 09T304 inserts, maybe it's me needing to experiment some more!
That's the tapers done, Engineering blue to check them on the spindle and just see light trough the gap to pull them up.
Set up on the mill to drill the mounting pin holes.
DRO makes it easy to get the holes in the right place,
thanks to @MBB for the locking screws PCD.
Tapped M10x1 and M6x1 for the pins and locking screws.
Back to the lathe to machine the other side.
and over to the mill to drill and tap the mounting holes.
Job done
Next is turn the collet holder down, turn the internal taper and cut the thread,
but as it's cold in the garage and I'm only allowed 10 photos it'll have to wait for another day.
Why ER25 - that's what fits the mill so I have a range of collect already in that size.
As before, many thanks to Pete for the steel and MBB for the mounting hole PCDs