Mounting an 8" Adjustable Chuck on a D1-5 Camlock Spindle

About six years ago I bought an 8" 3 jaw chuck for my 12" bench lathe as I had run into an occasion where the 6" chuck would not hold the part I needed to turn. I found it in an MSC "Inventory Blowout" sales flyer for $119.00 and it was listed as an Import 8" three jaw self centering chuck with two piece jaws so I ordered one. Much to my surprise, it turned out to be an Adjustable or Set True type chuck. I never got around to mounting it on my 12" lathe and forgot I had it. About a year ago I ran accross it sitting on a shelf with the box nearly rotted off of it so I decided I'd mount it on my 14" lathe so I set out to find an adapter plate for it to fit my D1-5 Camlock spindle. I measured the chuck and it was 8.3" in diameter and The only D1-5 plates I could find were exactly 8" which would place the mounting bolt holes right on the edge of the plate. I made lots of phone calls and finally identified the chuck as being made by Phase II so I tracked them down. It turns out that they never madeany adapter plates for it as it was a replacement chuck for a Super Spacer. My only option then was to buy a 10" adapter late and machine it down. I ordered a cheap Import plate for around $75.00 and set it on the shelf with the chuck and never got around to mounting it as I have a couple of 6 jw Set-Tru chucks that I use. I now have a little project that would benefit from using soft jaws so I figured I'd mount it up and use it to save wear on my good chucks.

Hope this info is of use to someone!



















Here's the 8" 3 jaw and 10" adapter plate. The adapter plate looks more like a brake rotor and I have no idea wht those six 10mm tapped holes are for> The box had been opened when I got it so possibly someone else put them in there for some silly reason and then returned it!




















The next step is to remove the existing chuck from the spindle. I always place a block of wood under a chuck befor I loosen it, so if (when) it falls off it won't ding up the bed ways or my fingers.

This is what a D1-5 Cam Lock Spindle looks like with tha chuck removed.

Now the new 10" Adapter Plate is installed using a wood block as described above. Amazingly enough, the runout was only .0003". I removed it and installed it a few timesand every time it was .0003-.0005" so it seems to seat fairly well against the spindle.

Next the centering boss for the chuck needed to be turned down a couple of inches for the chuck to fit over it. .250” depth of cut @315 rpm on a 6.5” diameter=HOT CHIPS!!

Then it needed to be shortened up about ¼”. Those goofy holes are in the way, but it will still work just fine other than the interrupted cut.

Now it gets faced off. Not a bad finish for cast iron!

The large OD it turned down to match the diameter of the chuck. A little chamfering, and we’re good to go. Too bad those six tapped holes were there, but it will still work just fine.

Next the plate was removed from the spindle and set up on the Super Spacer for drilling and tapping the mounting holes for the chuck. I centered the spindle over the Super Spacer using a test indicator and a piece of ground rod in the chuck since this is not going to the Space Station. The holes were drilled and chamfered. This is the side of the adapter plate that fits onto the spindle. These pins plug into the spindle nose and secure the adapter plate/chuck to the spindle.

And then tapped for the 10mm X 1mm bolts.

Ready to bolt the chuck to it. This is the side that plugs into the lathe spindle.

Here is the Adapter Plate bolted to the Chuck and ready to plug into the lathe spindle.

The Chuck bolted onto the Adapter Plate and the assembly is plugged into the spindle ready to be indicated in.

I got the silly thing to adjust down to a little under .0002” total run out and it held for three consecutive loosening and tightening of the jaws.

That’s it!

It’s ready to use.

Thanks for looking!

Glenn