20mm diameter Die Adapter for 1" Diameter Tailstock Die Holder

I was taken by surprise during my simple addition of making the M2.5-0.45 and M3-0.5 thread gages (see the second page to http://www.homemadetools.net/forum/t...-caddy-55964-2 ) when I discovered the die diameters for cutting the treads were 20 mm and not 13/16" in diameters. I bought the dies years ago from Enco (now part of MSC) and never thought to check the diameters until I started using them. I do not have any die stocks or a lathe die stock for the 20 mm diameter dies.

I made a simple 20 mm ID sleeve from 1" dia. stainless steel 303 solid rod, bored to 20.05 mm ID, with three pass-through screw holding holes for holding the dies from the set screws in a 1" (25.4 mm) tailstock die holder.

The typical 13/16" dies are 0.8125" in diameter and the 20 mm dies are 0.7874" in diameter. Very easy to not notice the difference in diameters unless I laid one die on top of the other and looked closely to see the difference. Now that I know the difference I have found through the Internet several designs of the 20 mm diameter die stock holders for dies typically in the M2.5 to M6 ranges.

Attachment 22961 Attachment 22962

THe following are the construction steps.

Attachment 22963 Attachment 22964 Attachment 22965

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THank you for looking,

Paul Jones

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Thanks Paul Jones! We've added your Die Holder Adaptor to our Tapping and Threading category,
as well as to your builder page: Paul Jones's Homemade Tools. Your receipt:

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Great work Paul, I need to make a attachment like that, I'll have to put that one on my to do list

Thank you Paul! Simple solution for the problem. Appreciate the Cogsill Burraway reference...very useful and cool tool design.

:hattip: PJ

Thank you Doug and PJs,

Unless it has to be welded, the stainless steel 303 is always my choice for machining SS and has a Machinability Index of 78% (the same as ordinary 1018 CRS). Sure better than machining SS 316 with a 45% index. I like the Cogsdill Burraway tools and have been able to collect their series as new tools from 3/32” to 3/8" by setting up an automated search on eBay and then waiting for a notification when it finds a Buy-It-Now priced item. If you are not in a rush then this is a great way for finding tools. Cogsdill has a cool YouTube site showing videos some of their advanced machine tool automation tools for horizontal boring mills. Fun to watch some of the extra-long reach tools.

Regards,
Paul