Where could I have a pulley spline broached?

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by Kenwc, Dec 31, 2011.

  1. Kenwc

    Kenwc Iron

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    I have restored an Atlas moel 73 drill press from the early 40's. The only thing I still need to do is have a new pulley made if that's even possible. I'm pretty sure I could find another pulley..perhaps a blank one...but it would need to be spline broached as you see in the pic. The spindle is likewise splined and slides up and down in the bore as you operate the quill. This one works but is "Wallered" out and vibrates and will only get worse. These are no longer available and I don't have a clue as to who might be able to broach one or even make a new pulley if needed. I've put a ton of work in this press and want to make it last another 70 years.

    Your advice is appreciated.
    [​IMG]
     
  2. Tony Wells

    Tony Wells Administrator Staff Member Administrator

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    That's a good job for a shaper. Otherwise, a standard broach bushing has to be modified to index properly for the drive splines. I'd inspect carefully the splines on the shaft also. Might be that you could pick up a mating pair and modify to accept. For instance, bore out the old splines and press and weld in a new "core". Provided of course, you could work out the shaft fit-up.
     
  3. David

    David Active Members Active Member

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    Kenwic

    I have a craftsman press that I am going to part out, I think it has a splinned pully. give me some measurements and I will check tomorrow. May work?????/ Got a picture of the press?

    David
     
  4. Kenwc

    Kenwc Iron

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    Thanks Tony...I did chat with a guy once that bored out his pulley and pressed in a new splined core as you describe but I can't find the conversation on the other forum.

    I agree a shaper would be an option but I've also seen round spline broaches. I'd really like to find a place to have this done but If I can't I'm sure it would be fun to either bore and replace or try and get my hands on an appropriate spline broach. I suppose with good measurements and skill (the latter of whick I lack) it could be done in multiple steps with a keyway broach.

    I have 3 Vintage Atlas Arbor presses that range fom baby sized to monstrous that could be used for this as well.
     
  5. Tony Wells

    Tony Wells Administrator Staff Member Administrator

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    You could drag them on your lathe if you rigged up a way to index it. I'd be really concerned about the shaft though. It's bound to be worn substantially.
     
  6. Kenwc

    Kenwc Iron

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    David,

    Several of the Crafstman and Atlas machines do have th same parts so it's possible. Thanks of looking for me. Here is an old pic from when I was dry fitting parts one day. I need to take some newer.
    [​IMG]
     
  7. Kenwc

    Kenwc Iron

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    The pulley is softer than the splined shaft so the splines on the shaft....while they could be better are usable. I also have a spare quill with spindle if needed. I also see the shafts sometimes on ebay but never the pulley.
     
  8. David

    David Active Members Active Member

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    The one I have is a bench model. probably a 50's , 60's model. I was looking at it today trying to decide what I was going to do with it!

    I can measure. What hp is motor?

    David
     
  9. Kenwc

    Kenwc Iron

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    1/2 horse.
     
  10. kd4gij

    kd4gij Active Members Active Member

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    If you have a shaft the same size with the same spline. You could make a broach out of it. By milling or grinding steps in it.


    Another way bore the hole to size then notch with an endmil and file square.
     
  11. Kenwc

    Kenwc Iron

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    Making a broach form an identical spindle shaft sounds interesting and I'll add that to the list of possible solutions. Thank you.

    Thats what makes these forums great...The great ideas from great members.
     
  12. nicky

    nicky Active Members Supporter Active Member

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    My first drill press was one of those Atlas machines with the same problem. Being in the garage business in those days I found a starter drive with the same spline and stripped it down and somehow attached it to the aluminum pulley. I didn't have a lathe so may have taken the pulley somewhere to have it machined out.
    Nick
     
  13. Kenwc

    Kenwc Iron

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    Thanks Nicky,

    Every idea begats other ideas and yours helps as well.

    Going over the problem in my mind this morning and after a quick jaunt out to the shop to place the pully where it goes I realize there are two issues.

    If we look at my pic below we see the splines of the top of the spindle sticking up through that shaft....the lower part of the pulley bore fits that shaft and is held there with a set screw. The upper part of the pulley is splined and that's what drives everything. What I realized today is that the looseness is where the pulley mounts to that shaft.....and loose to the point that when you tighten the set screw it pulls the pulley to the side just enough to vibrate when running.

    So having said all that, even though the splines are loose, I think the looseness of the pulley on that shaft is the bigger problem which might be easier to solve by boring and sleeving the lower bore unless I can find some "really" thin bushings.

    Sorry to rattle on about this but I'd like to come up with a method that could be used to repair many other Atlas and Craftsman pulley's and not just mine as they all suffer the same issue. Plus....I'm on my 3rd cup of coffee....
    :)
     
  14. David

    David Active Members Active Member

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    Kenwc,

    Here are the parts that I have.

    Pulley large is 5" dia
    Pulley small is 1.75" dia

    spline shaft od is .482
    spline od is .625
    Pulley id is .626 (outside spline)
    Pulley id is .484

    Not made by atlas. Some other company

    Doesn't look the same

    let me know

    David
     

    Attached Files:

  15. Kenwc

    Kenwc Iron

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    What you have there is the other type of drive setup where the upper "steel" sleeve is splined and does not depend on a soft alumimum splined pulley for drive. Its a much better design. It's on some Atlas models as well.

    The pulleys themselves were not made by Atlas. I forget now the ame of the casting company.

    I've considered in the past trying to adapt that setup to my press so if you're still going to part that machine out shoot me a PM and give me some info and I'll probably take some parts off your hands.

    Thanks for the pics and info.

    Ken
     

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