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71 g lathe
- Thread starter phillipaw
- Start date
- Replies 8
- Views 847
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
What's a 71G?
1" collet South Bends were 1.629 on big end - with .602 taper per foot on diameter - fits THEIR spindle bushings / sleeves and collet holders
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Sounds like an 18" if 2 5/8 - 6. These 18" were discontinued mid nineteen thirties
71 is listed in this 1923 pocket catalog
http://www.wswells.com/data/catalog/79JR/cat_79jr.pdf
71 is listed in this 1923 pocket catalog
http://www.wswells.com/data/catalog/79JR/cat_79jr.pdf
that is what i am finding out can i am working on making a face plate and a few backing plates to fit it just not familiar with taper in headstock. this machine is very solid for its age. called south bend and was told that with serial card on that old of a machine i date made and sold is all the information that will be on it. thanks for input
SBLatheman
Titanium
- Joined
- Jul 7, 2008
- Location
- South Bend, In
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Catalog 94 - also on Mr. Well's web page - has the last mention of the 18" in his catalog collection- says the hole thru is a sixteenth larger than the 1 3/8 in the 16"
Well - if SB had settled on the .602 taper per foot on diameter this early, that would be close to .150 on the dia in 3 inches (for a supposed taper length) - and if that was added to the 1.438 spindle hole dia., a person would have 1.5885 on the big end
If a person had the right kind of indicator, he could hold it in the tool post and SEE if he had .050 taper per side in 2". It would be important to have the indicator tip very close to center height wise
Well - if SB had settled on the .602 taper per foot on diameter this early, that would be close to .150 on the dia in 3 inches (for a supposed taper length) - and if that was added to the 1.438 spindle hole dia., a person would have 1.5885 on the big end
If a person had the right kind of indicator, he could hold it in the tool post and SEE if he had .050 taper per side in 2". It would be important to have the indicator tip very close to center height wise
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
None of the later SBs has anything "standard" for a spindle taper - except possibly the small versions
Yes, the .602 taper per foot is very close to MT3's .6024 - but SB used that .602 taper on MUCH larger diameters
Standard Tapers
Yes, the .602 taper per foot is very close to MT3's .6024 - but SB used that .602 taper on MUCH larger diameters
Standard Tapers
