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PK belt pulley vs v belt pulley

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by GoceKU, Aug 21, 2017.

  1. GoceKU

    GoceKU Macedonia Active Member Active Member

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    I need to start making the pulleys for the drill press i'm building and was planning to make them for standard v belts, but got thinking what if i use PK4 belts, are they more grippy on smaller pulley?
    80_578_388_ela_belt_cross_section.gif
     
  2. BigMo

    BigMo United States Iron Registered Member

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    My opinion is yes, the more surface area that you engage, the more traction you will have

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  3. Bob Korves

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

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    In my experience, when a drill press stalls, you want the belts to slip... :(
     
  4. BigMo

    BigMo United States Iron Registered Member

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    Spring loaded idler....?

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  5. dulltool17

    dulltool17 United States Active User Active Member

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    More grippy means more friction, meaning less available horsepower.
    Then there's what Bob said...
     
  6. kvt

    kvt Active User Active Member

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    Agree with Bob, when the belt slips I normally glad it did, otherwise something might break.
     
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  7. Chipper5783

    Chipper5783 Active User H-M Supporter-Premium

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    Sure, that belt will be grippyer, but does it matter? Regular v-belts perform very well, within their design capability. There are many thousands of DPs out there that have been running the same belt for many decades. If it works, then don't mess with it.
     
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  8. BigMo

    BigMo United States Iron Registered Member

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    Actually....i agree. V-belt on the Southbend been on there for well over 30 yrs
     
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  9. Ulma Doctor

    Ulma Doctor Infinitely Curious Active Member

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    v-belt would be the way to go
     
  10. 4gsr

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

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    I have a 9" SBL that was modified to run on a "J" size poly groove belt. Been using it like that for 50 years now. On its third belt. The real draw back is keeping oil off the belt. I gave up on that years ago. Seems to help for some reason.

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  11. GoceKU

    GoceKU Macedonia Active Member Active Member

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    After considering everything, i'll try making them V groves, i'll try using cut off tool first then an hss forming tool, thanks for all opinions and advices.
     
  12. 4gsr

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

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    Do little searching for "Poly Groove " . You should get lots of hits. A few will give dimensional information.
    Also go to "ToolFlo's" website and download either their turning tool catalog or specialty tooling. You will have to dig thru the catalog to find it.

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