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Old 09-22-2016, 08:46 AM
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Default How long are standard Morse #2 shanks?

When I tooled up my little 7x14 lathe, I bought a whole bunch of shortened Morse #2 shanks to hold multiple drill chucks at once. It worked great in the mini, but when I swapped over to the 9x lathe the tailstock was a standard size and wouldn't push my tapers out properly. I ended up butchering the heck outta one the other night to get it out of the tailstock after trying to wedge it out. The chuck popped off and I ended up taking the dreaded vice grips, clamped them down as tight as they'd go, and smacked 'em with a hammer.

So, I need to extend these out before I tear anymore up. But, how long should they be normally?
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Old 09-22-2016, 09:19 AM
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Here's one opinion:

http://littlemachineshop.com/reference/tapers.php

And another: http://www.drill-hq.com/2012/04/mors...ensions-chart/

And another: http://www.victornet.com/reference/Morse_Jacobs.html

Etc: http://www.armstrongmetalcrafts.com/...imensions.aspx
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Old 09-22-2016, 09:22 AM
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Dub, it is not uncommon on some lathes to have this issue with small tapers. On my 14-48 it shows with some #3 blanks, so I have a bolt threaded into the back end of the taper for the ejector thread to push on.
To answer your question, the dimensions of all 7 Morse tapers are here.
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Old 09-22-2016, 11:33 AM
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This issue normally only shows up if you're using morse taper adapters with a thread in the end for use in a drill press or milling machine with a drawbar. I can't say I've ever had a problem with an adapter or drill if it had a tang on it. As others have said, if you're using a threaded adapter in a quill with no provision for a drawbar you simply need to thread a bolt into the end. There are some tools that come with a stub shank and no tang--I have no idea why they even make them like that because they're always a pain. I've got a drill chuck with a #4 stub arbour and I had to build the end up a bit so it would reach the ejector...

The length itself isn't critical; it just needs to be enough that the end of the adapter contacts the ejector in the tailstock quill before the thread bottoms out. If your "extension" happens to be a bit longer than necessary all that happens is that the adapter sleeve pops out of the quill a bit sooner than it needs to.

An easy way to test or check the length of a taper is to put it in an adapter of the next larger size--in your case a 3-2. If your drift key can easily pop the adapter out of the adapter then it should work fine in the quill as well...
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Old 09-22-2016, 12:07 PM
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Roughly, lazily translating from a couple of the graphs...

It looks like on the LMS page it states 2.56" as the length. Measuring mine, it comes out to 2.055" from the shoulder to the end, with the actual used length at 1.875". Again, these are the "short" version designed for the 7x lathes and was purchased from LMS.

On the AutoDrill (attached screenshot) it claims with the tang (which mine doesn't have) should be 3.125".

These also don't have threads in the end, yet. Pretty sure that's how I'm going to solve the shortness issue and being exact won't make much difference. I just want to make sure I get in the correct ballpark if I should ever get another machine. Sure, I can make these work on this machine, but I'd rather have them be somewhat official in case it arises in future need.

Noticed that I'm also going to have to do this with my centers as well, apparently that's why I pulled the drill chuck and now I've got a live center stuck instead.
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Old 09-22-2016, 05:07 PM
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Hey Dubby,

Just unscrew your tailstock ram till it comes all the way out. you can look in the end opposite from the part stuck in there and see it. drop a punch or bar in there and bump the taper out.

If you have an area long enough on the small end just drill and tap it and put a bolt in there to make up the space so your threaded screw in the tail stock will press it out.

Scott
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Old 09-22-2016, 05:14 PM
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Could you drop in a 1/2" bearing ball and take up the slack? It will roll out.
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Old 09-22-2016, 06:50 PM
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Quote:
Originally Posted by USMCPOP View Post
Could you drop in a 1/2" bearing ball and take up the slack? It will roll out.
I was thinking a short piece of round stock. The ball bearing would be easier to get out though.
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Last edited by milomilo; 09-22-2016 at 08:43 PM.
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Old 09-22-2016, 07:04 PM
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I have ether threaded the end or welded on a piece of round stock
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Old 09-22-2016, 09:27 PM
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Here is the best link...

http://www.shopfloortalk.com/forums/...ad.php?t=46315
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