How to create an internal Morse Taper: FB Atlas and Craftsman Lathes

 

by Ronald Crowell


Taper attachment and boring bar to get it close, then finish to proper size and depth with a Morse reamer. Just reaming a hole will not guarantee it is centered. Do step 1 below first.
•1. Regarding boring the initial taper with a boring bar and using the Atlas taper attachment, the taper attachment adds flexibility to the system and the very necessary precision will be more difficult (but still possible). The alternative is to simply use your compound set at the taper half angle and crank a boring bar through it by hand, but note that the compound travel is only about 2 inches. You will need to take "another bite" to get the full length of a MT2 (3-1/8" min) or MT3 (3-7/8" min). This adds a risk of a step imprecision.

•Also, see my file in this group called " Precision Taper Turning.pdf ". Along with some setup advice it has a table of male Morse Taper dimensions at the end. Sorry, but I misplaced the proper female dimensions for the hole's gauge diameter at its mouth. I'll try to find it if you need it.
•2. For a final reaming, purchase a pair of reamers made for making Morse tapers, the first is a roughing reamer used if you skip the initial taper boring with a boring bar above, and the second is a finishing reamer. You MUST be careful to ream the correct depth.
•BTW: If you forego using a reamer and try to just bore a tapered hole, be aware that for a taper your cutter point must be EXACTLY at the lathe axis height or else you will get a nasty hyperboliod hole, where even a tiny HYPERBOLOID will result in a taper hole that has a neck in it and a Morse tool put in it will then rock. See my file that describes this problem and how to set tool height in my file " Setting Lathe Tool Height.pdf ".
•For your final finish after reaming, you are still not done. I suggest you read section 7 in my file where I finish by bluing and scraping the final taper for a collet chuck. You will need your best shiny Morse taper tool to check fit (unless you purchase a very expensive Morse taper hole gauge). See section 7 in " ER40 Collet Chuck to 1.5-8 Spindle Adapter Rev D.pdf ".
End of my soliloquy.

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