3/4-16 Sherline spindle adapter to ER16

After a lot of thought I ordered a Beal ER32 adapter and a Taig ER16 adapter both for the 3/4-16 Sherline mill spindle. I also ordered 3/8 inch Collets from Techniks for both adapters. I will get the parts in about 5 days and will update on the TIR and milling with 3/8 tool for both adapters. My reasoning was that additional tools like boring head and fly cutter are readily available on the ER32 but very limited on the ER16 size. So getting a new ER16 headstock while more accurate will be very limiting as far as additional tools go. The 3/4-16 headstock has a TIR of .0002 and the adapters are typically .0007 also pretty good.The Jacobs chucks for drilling are consistently .0025 with adapter, which is also typical for any chuck. The MT1 and Jacobs chuck has a TIR of .002 so hardly worth the effort of using the MT1 and drawbolt. So for non critical drilling I can use the 3/4-16 Jacobs adapter and chuck, very quick to go from spotting to drilling, and for the few times that accuracy matters I can use the ER-16 if its TIR is under .001and if not possibly the ER32. Milling on the ER32 is probably much better but I will try both.
I will post results in about a week.
 
It will be interesting to see which is more accurate. One of the benefits of an ER chuck is that it dampens vibration well. The greater mass of the Beall chuck should work in its favor but we'll see.

I ordered an ER-20 chuck from Tormach for my RF-31 to run a similar experiment. We shall see.
 
mikey said:
It will be interesting to see which is more accurate. One of the benefits of an ER chuck is that it dampens vibration well. The greater mass of the Beall chuck should work in its favor but we'll see.

I ordered an ER-20 chuck from Tormach for my RF-31 to run a similar experiment. We shall see.
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I agree the chatter that is prevalent on these mini mills should be dramatically reduced. Looking forward to results.
 
Very Interesting Howard. I will be watching for your evaluation/experience.
 
Forty Niner said:
Very Interesting Howard. I will be watching for your evaluation/experience.
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Keep in mind that my total experience is 6 months so I will make lots of mistakes but I will do my best and please offer advice if I am going down the wrong trail.
 
Forty Niner said:
Very Interesting Howard. I will be watching for your evaluation/experience.
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I just received the ER16 adapter and collets and what a pleasant surprise!
Here is the data;
Sherline 3/4-16 spindle TIR=.0002
Spindle + Adapter TIR=.0006
Spindle + Adapter + ER16 collet + 3/8 Mill TIR=.0008
I will try to put up two videos, have not done that yet so it may not work.
I am supposed to get the Beal adapter tomorrow night.
 

Attachments

  • IMG_0116.MOV
    25.8 MB
  • IMG_0117.MOV
    17.2 MB
Mikey
I hope these videos work
Howard
 

Attachments

  • Beal_ER32.MOV
    10.7 MB
  • Taig_ER16.MOV
    22.6 MB
Sorry to be so late to this discussion. I bought four of the Taig adapters for use as tool holders with my Sherline lathe and mill. These adapters have one problem. The threads are recessed into the nut so that you only get about 1-1/2 threats that engage the head stock's threads before the base of the adapter contacts the base of the head stock mount. I don't think that is enough. What you need to do is to shorten the nut at its base to bring the threads out closer to the mounting face. I made them about 3mm shorter and now they work great. How I did it was to mount a 5/8 inch bar on the lathe using an ER-32 head stock and a 3-jawed chuck on a live center on the tail stock. I mounted the adapter backwards on the bar so that its base can be cut back. You could use a 3-jawed chuck to hold one end of the bar and a 4-jawed chuck on the tail stock or vice versa. Or you could put a hole in the end of the bar first and then put it on a live center on the tail stock. It results in a shorter adapter which is also better.

How did they work out for you?
 
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