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Jet 1442

A couple of months ago I made, what for me was, a big step and bought a Jet

1442 lathe. Love it. However, I do have a question.

When I lock the headstock with the indexing pin, how do I turn the spindle

45 degrees. I know the spindle is indexed every 30 degrees and the holes in the housing are 20 degrees apart (yeah, I read the book). What combination of the two gives a movement of 45 degrees?

I have an eight spoke spinning wheel I am building for my elder daughter (The things we do for our kids.) and need to index the wheel in 45 degree increments.

Thanks

Deb

Reply to
Dr. Deb
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Bad new Deb, you can't. The 1442 (I also recently acquired one) does

10-degree increments. 36 (360 degrees/10) does not divide by 8. You have the choices of 2,4,6,9,10,12, and 18

Can you alter your design for 9-spokes?

-Steve

Reply to
Stephen M

There are several ways of doing this that I can think of.

Assuming that you are drilling into a hub for the spokes and it is held on a faceplate or in a chuck...

Do the holes at 0, 90, 180 and 270 degrees.

Then, mark the work half way between two holes and use the tool rest or something as a reference point. Unscrew the faceplate or chuck slightly and shim between it and the spindle bedding surface so that you are now on your reference mark. You can do this either by cut and try or math.

You know the number of turns per inch of the thread and you know that you want to offset 1/8 of a turn so choose the thickness of the shim accordingly. With a 8 tpi spindle, if you unscrewed one full turn (360 degrees) you'd need a shim of 1/8" or .125". You want to go 1/8 of that or .0156...". That should get you real close.

Anyway, now you can do the other 4 holes.

Bill

Stephen M wrote:

Reply to
Bill Rubenstein

What I forgot to say...

You sometimes wonder what the engineers are thinking about when they design a tool for us to use. Didn't they even think about asking some of us for input? Doesn't it seem obvious that the most useful increment for dividing is 15 degrees?

I've talked to the designer of a lathe which will remain nameless. He pretty much designed it in a vacuum and admitted that he "turned a little".

I could go on and on about some of the stupid design decisions in some of the lathes I've used but I'd bore you all to death.

Bill

Bill Rubenste> There are several ways of doing this that I can think of.

Reply to
Bill Rubenstein

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