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Thread: Head stock center to small Help

  1. #1
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    Head stock center to small Help

    Ok so I get the PM 45 all set up and wired. I put the head stock spur center in it slides all the way in to the caller and stops. It seems to need to be about a 1/4" longer to tighten up so it wont spin. It is as if the head stock is worn out
    I have checked the size it is an MT #2 the center is a jet MT#2 and the old one that I took from another PM 45 is to small also.
    Has any one heard of a head stock shaft wearing out? Is there a way to shim it?
    Is there a #2 spur center that is just a bit longer? How much bigger is a MT#3 and does any one know where to get one?
    With out the center it is going to have to stay as a salad bar.
    Last edited by Chuck Thoits; 04-29-2009 at 03:02 AM.

  2. #2
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    Hi Chuck

    I've heard of MT3 on lathes, but they are not common, as far as I can tell.

    How about the tail stock, doe the drive, or live center fit into it correctly?

    Grizzly has the >> Sorby Steb Centers in a MT3 << $80

    But really the way you might want to go is with an adapter sleeve.........

    Click image for larger version. 

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    $6 and you are good to go with the drive center and such you have....... ??
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  3. #3
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    Wearing out seems unlikely. From here it looks like a #3MT situation.

  4. #4
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  5. #5
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    Quote Originally Posted by Ron Sardo View Post
    Uh-Oh! Does this mean a spindle replacement is necessary?

  6. #6
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    The Serious lathe uses a MT3.

    http://www.seriouslathe.com/

    I have a friend who is selling one but I can't justify buying it.
    "Small Change got rained on with his own 38"

    Tom Waits

  7. #7
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    Quote Originally Posted by Chuck Thoits View Post
    Ok so I get the PM 45 all set up and wired. I put the head stock spur center in it slides all the way in to the caller and stops. It seems to need to be about a 1/4" longer to tighten up so it wont spin. It is as if the head stock is worn out
    I have checked the size it is an MT #2 the center is a jet MT#2 and the old one that I took from another PM 45 is to small also.
    Has any one heard of a head stock shaft wearing out? Is there a way to shim it?
    Is there a #2 spur center that is just a bit longer? How much bigger is a MT#3 and does any one know where to get one?
    With out the center it is going to have to stay as a salad bar.
    Chuck, it sounds like a call to Powermatic "Technical Dept" might be in order. The last time I talked to them with a question on an older tool, they still had a couple of guys there that had been there a LONG time and were very helpful and able to give me the information I needed.

  8. #8
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    Quote Originally Posted by Frank Fusco View Post
    Uh-Oh! Does this mean a spindle replacement is necessary?
    Well I am hoping that That I can have the MT#2 built up and then turned down to fit. Travis can this be cone? It only needs to be about 2 thousands bigger than it is. Or maybe if there is a make of MT#2 that is just a 1/4" longer than the Jet one it might work.

  9. #9
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    Head stock center to small Help

    Chuck,

    I think Travis might be familiar with a process where your center taper could be built up by "spraying" metal on and then, depending on how much was applied and how good the surface came out, it could be either turned down (roughing it close to size) or ground down to the desired size and taper dimension, or using both methods could be used for a super "micro" finish. If this is done properly it could end up being better than original.

    I have done it with good results. You're going to need to find someone with a good lathe that has a taper attachment and a tool post grinder for this. And they will have to be familiar with and have the tool for the process.

    I definetly would not use welding to build up the taper as that would do more damage than good and you may end up with a hard and soft surface which could be difficult to impossible to turn down.

    Keep us posted on your outcome.

    Aloha, Tony
    "You got to learn from the mistakes of others. You won't live long enough to make them all yourself". (Author unknown)

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  10. #10
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    Chuck, can you determine if it is the taper in the headstock that is oversize or the center you have that is undersize,

    Some male morse taper fittings do not have enough front 'over-run' of the Gauge size and if the socket taper has had to be reamed to clean out any scalding due to poor fitting center then they won't engage.

    SIZES (opens PDF file attached to this post (page 2)


    #1 is 0.475"
    #2 is 0.700" This is the nose diameter at the open end of the socket, and approx. 1/4" from the front of the male center.
    #3 is 0.938"
    Last edited by Chas Jones; 04-09-2008 at 12:28 AM. Reason: Imperial Gauge sizes added.
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