Semi Finished Adaptor for L00 lathe chuck.

Did you check the taper fit ? Bluing ? I would before you finish it just to be sure . See my link above to see how far mine was out. Hope yours is better then mine
 
Alcap said:
Did you check the taper fit ? Bluing ? I would before you finish it just to be sure . See my link above to see how far mine was out. Hope yours is better then mine
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Before I attempted to mount the plate, I did polish the bore with 200 grit emery paper. There were a few bits of slag in the bore from the EDM machine cutting the keyway. This situation was identified as a possibility by the vendor. I'm thinking there have been a number of problems of this nature when customers make the assumption the bore is clean. After cleaning the plate and spindle I did blue the spindle to check the fit. It was a good fit the entire circumference of both lands.

I switched to C2 cemented carbide this morning and did a little more cutting. This time it cut like butter. I've been taking .030" to .050" per cut at 95 rpms with no problems. I still have a lot of material to remove to get register down to 6" to fit the chuck. Once the register is fitted, I'll do a skim cut on the outside diameter to clean it up and remove any casting marks.
 
Finished the back plate last night and all appears well. Checking the runout on the outside perimeter of the chuck I get about .0005". I say "about since it varies a little depending on where I put the indicator, and the fact that the chuck has a few surface nicks. I could polish it to remove as many imperfections as possible, but it seems to be well withing workable tolerances.

I may have created a monster. The chuck itself weighs 80 lbs. and the backplate adds another 15 lbs. I now have a 95 lb. chunk of iron I need to lift and install every time I want to use it. I installed the complete assembly yesterday and it was about all I could do to lift it and align it. I'm thinking I'll need to fabricate some type of lifting mechanism for future use.
 
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Glad you had better luck then I did . and everything round true That’s a lot of weight to handle !
 
I've bought 2 L00 backplates from them. One is on a Jacobs spindle nose collet chuck, and the other came with, but separate from an imported 6" 3 jaw chuck. As you did, I got nowhere with hss lathe tools while cutting them to fit my chucks. They are both repeatable when mounting them on the spindle and both properly pop off of the taper with the the collar being unscrewed.
To check repeatability, dismount and mount the backplate after you are done cutting it and check the runout. I bet runout will be zero after you cut it and just a few 10ths when remounted.
 
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