Pm1440GT one piece spindle bore dead center

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Lonewolfgun

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So I bought a MT5 spindle bore the other day and when it arrived today it doesn't fit, too small. SO I grab my manual and it says MT5 on it. So I go to PM's website to check the specs on there and too my surprise it says MT5-1/2.

So I did a quick google search to see if I can find a one piece dead center and I don't know if my google-fu isn't strong today or there isn't much out there on a mt5-1/2.

Does anyone know where to find a one piece MT5-1/2 that'll fit the spindle bore?
 
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You should have a "Reducing Sleeve for Headstock Center" that came with your lathe in the toolbox, you will need to check if it is a MT4 or 3.
 
I would measure the taper. I have a similar sized Chinese import machine and it has a MT6 headstock taper.
I have on occasion heard Morse Stub Tapers referred to as 1/2 sizes but best to measure and be sure. typos are very common these days.
BTW the only 1/2 size is a MT 4 1/2 which is is pretty much obsolete.
 

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  • Standard Tapers.pdf
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There is a reducing sleeve in there but there isn't anything written on it.

I know it's not a mt6 because the BV I had was a MT6 and the dead center I kept from it is considerably bigger.
 
The 1440GT headstock spindle taper is a MT 5 1/2, it is unusual but it is a function of the D1-5 mount and the 2" spindle bore. You can measure the taper on the reducing sleeve, I expect it is a MT4 but you can ask them if you are unsure. Many lathes come with a reducing sleeve for the headstock spindle taper. It is probably possible to recut the taper on a MT6 dead center, may be difficult to get it spot on. I have cut ER collet tapers and MT3.
 
So the Taiwanese have invented an MT 5 1/2? The MT tapers go from 0 - 7 with the only half size 4 1/2. I would measure the actual taper and be certain. I would also seek confirmation from PM.
 

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  • Morse Taper Dimensions.pdf
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Perhaps MT5.5 is incorrect terminology, but it is the terminology PM uses. MT5 is too small, MT6 too big.
 
I am in a very similar situation. I have every reason to believe that the internal taper of the spindle nose on my PM-1660TL with a D1-6 Camlock is 6 1/2 Morse Taper (!).

The only solution I found is make my own dead center. The material (cold rolled steel) was only $66.
 
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