- Joined
- Nov 18, 2012
- Messages
- 1,352
I have been wanting to get some collet blocks for doing flats for squares and for a hex, but every thing seems to be for 5C collets. Most of my work is rather small for repairing old mechanical clocks.
Background: My main lathe is an Atlas 618 with a MT2 spindle and MT1 tailstock. I also have a full set of Unimat DB200 accessories that I made an MT2 to 12mm x 1mm thread to take the Unimat chucks. My rotary table also accepts MT2 taper. So that is pretty much my set up. My "mill" is a tricked out JET 13R benchtop drill press.
So we decided to see if we can make a collet block to accept the MT2 taper. Rather than make two, we decided to make one with flats 30 deg apart to accommodate the common one, two, four square and of course the hex.
The only material I had on hand is some 6061 Ø 1.25" aluminum.
So here goes.
My lathe is 70 years old and I am the second owner. It has been gently used but does show signs of wear in some areas of the bed, so first was to check the tailstock alignment in the working area for a later set up.
next is to set the compound for 0.025"/1" taper.
For a double check we had an MT2 - JT33 arbour with centres on each end.
Now to mount the work piece and centre close as possible.
After drilling an boring out the minor diameter now time for the taper boring. Although the boring bar is very long we started with a shorter one and increased as we got deeper. Lots of spring back so quite a few spring passes occasionally. Oh and slow going with the compound.
Once the MT2 taper is finished, we must finish the OD concentric with the internal taper. The MT2-JT33 arbour is used as a mandrel to drive the work piece so it was driven on hard. The arbour was then turned between centres and driven with the lathe dog. This is why the tail stock was verified previously.
Time for a break will come back soon.
David
Background: My main lathe is an Atlas 618 with a MT2 spindle and MT1 tailstock. I also have a full set of Unimat DB200 accessories that I made an MT2 to 12mm x 1mm thread to take the Unimat chucks. My rotary table also accepts MT2 taper. So that is pretty much my set up. My "mill" is a tricked out JET 13R benchtop drill press.
So we decided to see if we can make a collet block to accept the MT2 taper. Rather than make two, we decided to make one with flats 30 deg apart to accommodate the common one, two, four square and of course the hex.
The only material I had on hand is some 6061 Ø 1.25" aluminum.
So here goes.
My lathe is 70 years old and I am the second owner. It has been gently used but does show signs of wear in some areas of the bed, so first was to check the tailstock alignment in the working area for a later set up.
next is to set the compound for 0.025"/1" taper.
For a double check we had an MT2 - JT33 arbour with centres on each end.
Now to mount the work piece and centre close as possible.
After drilling an boring out the minor diameter now time for the taper boring. Although the boring bar is very long we started with a shorter one and increased as we got deeper. Lots of spring back so quite a few spring passes occasionally. Oh and slow going with the compound.
Once the MT2 taper is finished, we must finish the OD concentric with the internal taper. The MT2-JT33 arbour is used as a mandrel to drive the work piece so it was driven on hard. The arbour was then turned between centres and driven with the lathe dog. This is why the tail stock was verified previously.
Time for a break will come back soon.
David