On Tue, Feb 14, 2023 at 10:13 AM, Jack Dinan wrote:
Here¡¯s another pathway, suggested by many others as well.
Ten years ago, I had no idea how to cut a metric thread on my SB9A.
The internet and a single article in HSM magazine convinced me that I could.
I learned and fabricated the ER-40 adapter with the M50 x 1.5 thread required for the clamping nut.
It remains the most difficult and most satisfying job I¡¯ve done.
Consider taking the plunge.
This is what I did. ?In the end it wasn¡¯t really difficult, just take your time cutting the threads. Those metric thread are very fine. I made the first one for my SB9A, I made a second one when I got my SB13. I also made some ER40 collet blocks while I had the taper attachment adjusted correctly.
BTW, I am a rank amateur with no training besides high school metal shop 40 years ago. You can do it!
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On Feb 14, 2023, at 9:57 AM, Andrei <
calciu1@...> wrote:
Why don't you get this, instead??
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High Quality 5" 5C Collet Chuck Closer Lathe Plain Back Use 5C Collet.i have adapter plates for 75 to 100 each<br>
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All you need to do is fit a backing plate to it. No threading.?
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Hi,
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WRT collet chucks for the lathe.? I've been planning to make the attached adapter for a while to suit my single tumbler heavy 10.? What is stopping me is my inability to cut metric threads so I can use commercially available collet nuts and/or a lack of faith that I can make a collet nut. The design is based off of a 5C collet adapter. (?) This is the variation where I trust the taper to secure the adapter in the spindle similar to a 5C collet adapter.? Alternatively, I could use the 5C collet closer to secure the adapter in the spindle, the threading for that is not shown. I figured that I'd machine the external taper between centers and then insert the adapter into the spindle and machine the internal taper, bore and thread for collet nut.
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Note that the taper is wrong for the heavy 10 spindle per tooling chart, need to adjust before I make.
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Any thoughts would be appreciated.
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Erik S.
