ER32 collet chuck for D1-4 mounting...
One would think a suitable chuck would be readily available but I have failed to find one, they were available in the UK but not anymore, apparently.
Nothing to do but adapt something, so I started with a rather too large back plate:
IMGP9441 by aardvark_akubra, on Flickr
...the hole in the middle is too big for the mounting taper on the ER32 chuck so I carefully turned a shallow socket in the face plate to suit the outer diameter of the collet chuck.
Here is the chuck:
IMGP9444 by aardvark_akubra, on Flickr
... it looks nice enough, but take a closer look. "Germany" is spelt with a "C"!
Because I was mounting this against the face I had machined on the back plate I turned up a stub of scrapbinium and mounted the chuck to that so I could take a skim off the rear surface, I was suprised at how much out of true that surface was.
IMGP9443 by aardvark_akubra, on Flickr
The big excitement of the day:
IMGP9445 by aardvark_akubra, on Flickr
... I am drilling holes to screw the chuck to the backing plate, this was the first time I had used the pitch circle feature of my mill's DRO, but I flubbed it somewhat. The metal of the chuck was quite hard and although my pilot drill went right through OK the larger diameter drills wandered off and the hole positions are not accurate.
"Finished":
IMGP9446 by aardvark_akubra, on Flickr
...the DTI shows .008mm runout which I presume is "OK"? I hope so as it was really difficult to get it that close, my bolt holes are out of place and I had to turn down the heads of the cap screws to get the necessary 'wriggle' room and the body of the chuck proved to not be concentric with the collet axis which meant my carefully machined socket in the back plate had to be enlarged. The chuck is now located only by the set screws and I am wondering if I should be worried? Maybe I should put some Loktite under there? Perhaps drill from the back and put in a couple of dowels? Maybe not worry about it?
The back plate is rather big for the chuck, I have considered turning it down (that would be a big bin of iron shavings) or trepanning off the ring but thats a bit scarey at the point of break through. I think I will just tell myself that the big backing plate makes a handy handle for turning the spindle etc.
One would think a suitable chuck would be readily available but I have failed to find one, they were available in the UK but not anymore, apparently.
Nothing to do but adapt something, so I started with a rather too large back plate:
IMGP9441 by aardvark_akubra, on Flickr
...the hole in the middle is too big for the mounting taper on the ER32 chuck so I carefully turned a shallow socket in the face plate to suit the outer diameter of the collet chuck.
Here is the chuck:
IMGP9444 by aardvark_akubra, on Flickr
... it looks nice enough, but take a closer look. "Germany" is spelt with a "C"!
Because I was mounting this against the face I had machined on the back plate I turned up a stub of scrapbinium and mounted the chuck to that so I could take a skim off the rear surface, I was suprised at how much out of true that surface was.
IMGP9443 by aardvark_akubra, on Flickr
The big excitement of the day:
IMGP9445 by aardvark_akubra, on Flickr
... I am drilling holes to screw the chuck to the backing plate, this was the first time I had used the pitch circle feature of my mill's DRO, but I flubbed it somewhat. The metal of the chuck was quite hard and although my pilot drill went right through OK the larger diameter drills wandered off and the hole positions are not accurate.
"Finished":
IMGP9446 by aardvark_akubra, on Flickr
...the DTI shows .008mm runout which I presume is "OK"? I hope so as it was really difficult to get it that close, my bolt holes are out of place and I had to turn down the heads of the cap screws to get the necessary 'wriggle' room and the body of the chuck proved to not be concentric with the collet axis which meant my carefully machined socket in the back plate had to be enlarged. The chuck is now located only by the set screws and I am wondering if I should be worried? Maybe I should put some Loktite under there? Perhaps drill from the back and put in a couple of dowels? Maybe not worry about it?
The back plate is rather big for the chuck, I have considered turning it down (that would be a big bin of iron shavings) or trepanning off the ring but thats a bit scarey at the point of break through. I think I will just tell myself that the big backing plate makes a handy handle for turning the spindle etc.
