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| Requirements for the thread on a hub puller http://forum.triumphdolomite.co.uk/viewtopic.php?t=33518 |
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| Author: | MIG Wielder [ Thu Jan 18, 2018 4:34 pm ] |
| Post subject: | Requirements for the thread on a hub puller |
If you are designing something like a hub-puller with a screw thread what would you choose as the thread form ? O.K. I can see that the larger the diameter of the forcing bolt the better ... but I was looking at my commercially produced ones. The small gear puller has a coarse metric thread. The large 3 legged puller has a funny square section coarse thread. My really large hub-puller has a large forcing screw but with a very fine thread. What is technically the best please ? Or does it not matter ? Thanks, Tony. |
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| Author: | dollyman [ Thu Jan 18, 2018 6:42 pm ] |
| Post subject: | Re: Requirements for the thread on a hub puller |
I would have thought the fine thread for really heavy duty? All my big pullers have got a fine thread. I think it distributes the force slower and get's a better torque. What do other's think? Cheers, Tony. |
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| Author: | Karlos [ Thu Jan 18, 2018 9:31 pm ] |
| Post subject: | Re: Requirements for the thread on a hub puller |
A finer thread will require less torque to achieve the same force through the puller than a course thread. So with a fine thread you can apply more force than with a course thread cut of the same diameter. If you think about TPI : 10 TPI = 10 rotations to move 1 inch 20 TPI = 20 rotations to move 1 inch The mechanical advantage is gained by having a higher TPI, which means less effort to split a taper joint OR your puller can deal with really tight hubs. |
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