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Material for large pulley

Discussion in 'A BEGINNER'S FORUM (Learn How To Machine Here!)' started by JPMacG, Aug 16, 2017.

  1. JPMacG

    JPMacG Active User H-M Supporter-Premium

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    I'd like to make a new pulley for the counter shaft of my lathe. The pulley is 9 inches in diameter and has two sheaves.

    My question is what to make it from. Searching online, it seems that the two most economical options are 6061T6 aluminum and grey cast iron. Either would cost around $60 for a 9 inch diameter 1.5 inch thick piece. Is there another option that I should consider? Of course, I would like something less expensive.
     
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  2. RandyM

    RandyM United States Global Moderator Staff Member H-M Supporter-Premium

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    Are you in it for the fun of making it?

    Because you should be able to buy one. Mind you, I am thinking v-belt.
     
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  3. David S

    David S Canada Active User H-M Supporter-Premium

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    Would it be any cheaper to make it in two pieces from 3/4" plate?

    David
     
  4. mmcmdl

    mmcmdl H-M Supporter - Premium Content H-M Supporter-Premium

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    I'm with Randy on this one . I had a job way back making large pulleys in my first shop , way too large to plunge with a form tool . Ended up plunging with an Iscar carbide parting tool and then doing a lot cranking on the compound which was not fun . Seems to me buying one would be the cheaper solution . But hey , the fun is in the making !
     
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  5. benmychree

    benmychree United States John York H-M Supporter-Premium

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    If you NEED to make one, do the aluminum, it would have less inertia, faster starts faster stops, if that is an issue, also, cast iron, which I dearly love, is less apt to run balanced than aluminum. That being said, buying one MAY be cheaper.
     
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  6. RJSakowski

    RJSakowski H-M Supporter - Premium Content H-M Supporter-Premium

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    You can get a 9" dia. by 1.5" thick piece of 6061 from online metals for around $50.

    For a less expensive alternative, you might look at casting your own blank. A foam pattern could be made and the lost foam process used for casting. If you wished, you could use Zamak for a lower the melting point. When I used to cast Zamak, I got my metal from old automotive castings but it is used in a wide variety of products.
     
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  7. woodchucker

    woodchucker United States Active Member Active Member

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    If I had to make one, I would consider the heavier weight a benefit. Especially with an low powered unit. Inertia is like horsepower, it helps you get through the parts on flywheel . it also creates an even speed for the spindle, which leads to smoother cuts.
    That would be my opinion.. But AL is much easier to work.
     
  8. RJSakowski

    RJSakowski H-M Supporter - Premium Content H-M Supporter-Premium

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    A bit more on the Zamak. It's melting point is about 700ºF, similar to lead, and its density id about 7 g/cc or about the same as cast iron. Zamak is an aloy consisting primarily of zinc, with aluminum being the major alloying metal at around 4%.

    To make a simple disk would require around 25 lbs of metal. That could probably be cut in half or better with a pattern more closely resembling the final shape. I

    f I were doing it, I would make the pattern of two stacked disks slightly larger in diameter than the final dimensions.
     
  9. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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  10. Superburban

    Superburban United States Active Member Active Member

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    The surplus center, has some 3 grove pulleys in 8&3/4, or 9&3/4", that you might be able to use.

    I made a large serpentine belt pulley for a pump, out of a weight lifting barbell weight. Made the bore fit a split bushing hub that I had. The weight did not matter to me, but one could take a bunch of the weight off the center if it needed to be lighter.
     
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  11. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    Made a couple of step sheaves in my youth made from burnouts from steel plate. Took about a week after school cutting on it to get it to size on dad's 9" SBL. Finish size was about 8-1/4". Would I do it again? I would do it again in a heart beat on a bigger lathe!:D

    Edit: I notice you have a 12" Atlas/Craftsman Lathe. Is this what the sheave is going on to?
     
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  12. mmcmdl

    mmcmdl H-M Supporter - Premium Content H-M Supporter-Premium

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    Yep , thats what I was wondering . What size lathe is going to be swinging this pulley ? If it's that little lathe , he'll never have the torque or the low rpms needed . But once again , I've spent 100 hours to make something that I could have purchased for $40 . That's the illness in us !:)
     
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  13. JPMacG

    JPMacG Active User H-M Supporter-Premium

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    Thanks everyone. Yes, it is for my Craftsman 12-inch lathe. The original pulley wobbles. The original is Zamac, by the way.

    I searched but did not find a suitable pulley online. It has two sheaves - diameters are about 9 inch and 7 inch. I did not check with Clausing (Atlas) for an original part, but their stock of parts for old Craftsman/Atlas lathes is thin. If they happen to have it they would want big $$. Used parts do show up on eBay frequently, but they are not inexpensive and I worry that a used one might have been abused.

    I had good success turning smaller 2-sheave pulleys, so I'm tempted to attempt to this one. It would be by far the largest part I have tried to turn. It might be a good learning experience or a it might be a disaster.

    I have not ventured into casting at all, so for me that would be a new hobby in itself.
     
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  14. Superburban

    Superburban United States Active Member Active Member

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    Places like Tractor Supply have blank pulleys, and separate hubs, that you weld together. I bet you could take the hub, and turn it so it holds two pulleys. Or just turn your own hub.
     
  15. CluelessNewB

    CluelessNewB Active Resistor H-M Supporter-Premium

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    Yes and another opportunity to acquire more tools! Whoever dies with the most tools wins! :)
     
  16. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    I have a piece of aluminum that is 12" OD x 6" long. Too big for my saw. If you have a way to cut it, I might try to cram it into a flat rate box and ship it to you. That would be 66 lbs.! The post office would really hate me dragging it to the counter!

    On a serious note, if you have a little time on this, let me do some digging around and see what I can find for you.
     
  17. randyjaco

    randyjaco Reserved Active User H-M Supporter-Premium

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    I don't get your rational on that statement. For a lathe I would inertia should be your friend (up to a point). The inertia should help with surface finish and cut regularity. I guess the lack of inertia would be best for an emergency stop, but that would be the only plus I can think of.
    Randy
     
  18. mark_f

    mark_f Global Moderator Staff Member H-M Supporter-Premium

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    I would make it from cast iron, plus it is great to machine.
     
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  19. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    Another thing to keep in mind when you make the sheave. Bore it for a taper lock bushing. That way you don't have to worry about the sheave crawling around on the counter shaft causing havoc later.
     
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  20. Ulma Doctor

    Ulma Doctor Infinitely Curious Active Member

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    i like the idea of creating your own pulley from scratch.
    sure you can buy one, but making one is satisfaction beyond measurement :grin:
    every time you use that lathe, you'll know that you fit the pulley that turns the spindle, that turns the new creation

    i didn't use the 2nd step on my Atlas TH42 at all
    maybe you should consider whether you will be using the lathe at its higher speeds.
    if you aren't using the high speeds,
    you may wish to omit the high speed pulley and make a single pulley instead of a double pulley to save material and make the job a lot simpler :black eye:
     
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  21. JPMacG

    JPMacG Active User H-M Supporter-Premium

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    I should have thought this through more carefully before posting. I just made some measurements and I now realize that a 9 inch diameter is too large for my lathe.

    Although my Craftsman is called 12-inch, and the bed will clear a 12 inch diameter, there is no way I could cut the tapered sheaves of a 9 inch pulley. I might be able to make a face cut on a 9 inch part, and I could possibly cut the diameter of the part with the compound and Y axis almost to their travel extremes, but I would not be able to cut the sheave with the compound adjusted for the desired Vee angle. The part would be trying to occupy the same space as the tool holder.

    Ulma Doctor's idea of omitting the small sheave is interesting. I can buy a 9-inch pulley.

    Thanks everyone, and I apologize for spinning you up on my dead end.
     
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  22. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    It's not a dead end. Just have to think about the ways to hold a piece of 9" OD material.
    When I turned the 8" sheave on my 9" SBL, I took and drilled and tapped four 3/8-16 holes on the face of the disk on a appropriate bolt circle. Then install four socket head cap screws about 3/4" long. Turned the jaws around on my 4-jaw chuck and chucked on the heads of these socket head cap screws. I was able to cut and finish the entire three step sheave in the one chucking. I think I even did the taper lock bore in the same chucking. Last, all I had to do was remove the cap screws, chuck on one of the steps and face off the other side. The four threaded holes won't hurt anything later. It's just a means of holding a piece of material to cut on.
     
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  23. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    There are other ways to hold tools besides what you have been using so far. Think outside the box... One example. Take a decent sized boring bar, 3/4" or bigger, install it on the side of the tool post facing you, bar going to the left and cutting edges facing toward the spindle center. Then "bore" the O.D. of the large work. That is just one idea that would not take me any tooling I do not already have.
     
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  24. markba633csi

    markba633csi United States Active Member Active Member

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    How bad does the original wobble? Perhaps you could do a handy dandy straightening job? Or is it not concentric with the bore?
    Mark S.
     
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  25. Superburban

    Superburban United States Active Member Active Member

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    If the bore is off, one can chuck the pulley by the outer edge, and cut a new bore. Then simply use a sleeve to mount the pulley.
     
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  26. Jimsehr

    Jimsehr United States Active User Active Member

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    I made a few pulleys from drops of Corian that I got from a Habitat for Humanity
    Surplus store. The material came from where they cut out the sinks. It can also be cut on a table saw. Dulls blades . I bolted two pieces together. And cut the V on a rotary table on the mill.
    Jimsehr
    Ps material cost me about $5 and I have enough left over to make more.
     
    Last edited: Aug 17, 2017
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  27. JPMacG

    JPMacG Active User H-M Supporter-Premium

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    The original wobbles about 1/4 inch left-right, looking at the lathe from the front. It is enough to cause a noticeable vibration on the lathe bed. I suspect that a previous owner bent it when he removed the pulley from the shaft, as I see hammer marks on the back side of the hub.

    As Bob Korves said, I could probably work out a way to cut the Vee on 9-inch material using some sort of clever tool post extension. I do worry about rigidity.

    I could try to bend it back, but I'm not sure if the Zamac would cooperate. Probably better to bore and sleeve the hub, but I'm not sure if there is enough material there. In any case, I would need a replacement pulley while I work on this one. I could buy one on eBay and resell later, it if the repair is successful.

    I will think it all through - no rush. I have a useable lathe now, I just want to make it better. You all have given me many good ideas. Thanks!
     
  28. GoceKU

    GoceKU Macedonia Active Member Active Member

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    I've used car flywheel its balanced and usually free from any mechanics shop, you could use an forming tool to cut the belt shape
     
    Last edited: Aug 17, 2017
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  29. GoceKU

    GoceKU Macedonia Active Member Active Member

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    Here are couple i've removed the starter ring gear from.
    DSC_0008.JPG
     
  30. ELHEAD

    ELHEAD United States Active User H-M Supporter-Premium

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    I second this idea
    Dave
     

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