Inside taper on an L-1 spindle

[toyjeep73]

I have figured out that the spindle on my lathe Standard Modern is L-1, but none of the charts I have found dimension the inside taper.

I have a 5MT live center laying around that is way to small.

The open end of the spindle measures 2.34". Can I safely assume that is a 6MT that is a little small so that it projects through the dog plate?

6MT tooling is starting to get expensive, so I don't want to buy the wrong center if there is some other odd taper.

[Don Young]

I do not know the answer to your question but you can get a pretty good idea of the rate of taper by seeing how far a round sharp edged cylinder goes down the hole. From the hole diameter at the end, the diameter of the measuring cylinder, and the depth the cylinder goes in, a little math will give you the taper per inch. Those dimensions should identify the type of taper. As long as the taper per inch is correct, a center should work if the inserted depth is satisfactory.

[Robbie's Machine Service]

I have figured out that the spindle on my lathe Standard Modern is L-1, but none of the charts I have found dimension the inside taper.

I have a 5MT live center laying around that is way to small.

The open end of the spindle measures 2.34". Can I safely assume that is a 6MT that is a little small so that it projects through the dog plate?

6MT tooling is starting to get expensive, so I don't want to buy the wrong center if there is some other odd taper.

Go to Manhatten Supply Company
Look under Chuck Backing Plates
It will tell you what you need.

Robbie

[LKeithR]

Mount a dti on the toolpost, start it into the bore and zero it. Move the carriage in by a convenient distance; say .500" - .750" and read the deflection of the indicator. A little calculation will tell you the exact taper of the hole...

[scotplant]

try this site dont know your model but it says morse 5 here..
http://www.lathes.co.uk/standardmodern/
Tom

[John Stevenson]

Half angle is 8 degrees, 17 minutes and 50 seconds.

Same angle on all the L series

Scrap that, mis read the post, though you wanted the outside angle, brain fart, past bed time, not enough alcohol in the blood stream.