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- Sep 3, 2011
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Working from memory (an increasing bad thing to do), I had recalled that No. 22 machines were available with "No. 2" taper spindles (among other tapers), but I am not able to confirm that. The only machine that I found for sure that had a No. 2 taper spindle was the No. 1V (vertical), which is rarer than hen's teeth.... Perhaps what Cal was saying is that there is a NMTB 50 Collet / Insert adaptor (Draw In Tube) that was available so that the VN no2 (50V) collets & inserts could be used? ...
Van Norman No. 2 milling machines were large horizontal milling machines and every brochure or manual that I have lists them as having a 50 NST (aka NMTB or NMTBA) taper spindles. There were No. 2 collet adapters for 50 NST, so a No. 2 milling machine could use a No. 2 collet (via an adapter) but, as far as I know, none had a No. 2 taper spindle.
Smaller Van Norman "duplex" or "ram type" milling machines Nos. 6, 12, 16, and 16L appear to have only been made with the "C" spindle taper. The No. 16S and 16M could be ordered with either a "C" or 30 NST taper, as could the later 1RQ and 2RQ.
The No. 22 duplex milling machines were built with B&S (Brown & Sharpe) #13 tapers as well as 40 NST and 50 NST tapers. If you wanted collets for your No. 22 milling machine, you ordered a No. 2 taper adapter for your spindle and No. 2 collets.
The larger machines (30V, 24M, 26, 36, 38, 2R-3-28, 2R-5-28, 3R-10-34, etc.), appear to have all had 50 NST taper spindles.
Now, all that said, I have no doubt that there were Van Normans with other spindle taper made. The above is what appears to be the common spindle tapers.
Dividing heads and sub-heads for the smaller (6, 12, 16, 16L) machines had "C" spindle tapers. The dividing heads and sub-heads for the larger machines usually had "No. 2" spindle tapers and could use "No. 2" collets without an adapter.