Machinist question

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Hi  I'm  not sure if this is appropriate  here  as it is more a  machinist  question. I have had this  Sealey  puller for ages.  But the threads  have got twisted  and  broken.  thethreaded  inside part  is ok  as the top two" of thread  works good  I  was looking for a new one as it was a very handy  puller.  But the only one's  I can find in that size  are on  ebay  UK  and the seller doesn't ship to Canada.  It is  250mm wide  and  200mm long.   I wondered  if it  would be possible to cut a newbolt for it?  It is a very fine thread.  But the centre seems  heavy enough to  drill and change to a  courser thread if that would be easier. I appreciate  any  suggestions .  Hope  Sam  might notice it?            Thanks
Reply:Thread insert Sent from my SM-G960U using TapatalkI haven't built anything I can't throw away.  Perfection is the journey.    Mac
Reply:There Journeyman ‎Machinist here.I have union card myself but background in welding and fabrication. Typically I would just use grade 8 all thread. The internal thread maybe damage too check before buy the all thread. You both inch and mm all thread. So choose for next step up.Dave  Originally Posted by Josey Hi  I'm  not sure if this is appropriate  here  as it is more a  machinist  question. I have had this  Sealey  puller for ages.  But the threads  have got twisted  and  broken.  thethreaded  inside part  is ok  as the top two" of thread  works good  I  was looking for a new one as it was a very handy  puller.  But the only one's  I can find in that size  are on  ebay  UK  and the seller doesn't ship to Canada.  It is  250mm wide  and  200mm long.   I wondered  if it  would be possible to cut a newbolt for it?  It is a very fine thread.  But the centre seems  heavy enough to  drill and change to a  courser thread if that would be easier. I appreciate  any  suggestions .  Hope  Sam  might notice it?            Thanks
Reply:The thread insert is only a stop gap that purchased over counter. When make insert's I use O1 tool steel. But puller is very then at threads which may fail using inserts.Dave One of the better in pass was bore threads a little bigger and use straight insert with collar for welding so does not turn it takes less metal still using O1 tool steel. Originally Posted by Mac's CrewThread insert Sent from my SM-G960U using Tapatalk
Reply:Finer threads allow a lot more torque. I think you should be be able to drill and tap it for the next larger size (or 2 sizes larger depending on drill size for tap) fine thread bolt. Then use a grade 8 or stronger bolt for the screw like Smithdoor mentioned. Most important is getting the threads perfectly straight in the puller so the screw stays centered. Clamped and using a drill press or mill to tap would be best.
Reply:Originally Posted by Welder DaveFiner threads allow a lot more torque. I think you should be be able to drill and tap it for the next larger size (or 2 sizes larger depending on drill size for tap) fine thread bolt. Then use a grade 8 or stronger bolt for the screw like Smithdoor mentioned. Most important is getting the threads perfectly straight in the puller so the screw stays centered. Clamped and using a drill press or mill to tap would be best.
Reply:Generally the threads on the screw stretch and get banged up. Finding a threaded rod the same pitch and size may be difficult. McMaster Carr carries some weird threaded rods and also many pullers utilize the same odd size threads. Tig welding a nut on the underside and using a different thread size and pitch may be an option.
Reply:https://www.mcmaster.com/bearing-puller-forcing-screws/
Reply:Originally Posted by G-ManBartWhy drill and tap the body when those threads are good?  Wouldn't just be easier to get a thread gauge, find out what pitch the bolt has and replace that with something that matches?
Reply:Here's a chart of both metric and standard machine screws:https://www.bestmaterials.com/PDF_Fi...crew-sizes.pdfIt likely that the screw is metric since the manufacturer is in the UKPutting a coarser screw is a bad idea (re. Welder Dave).  A fine screw is like low gear on a transmission.  Makes it easier to generate more force.  If you want to pull a stump, you put the truck in low gear.
Reply:If I read you right, the body of the puller has threads that are still OK.  If that is the case, figure out thread pitch and diameter with a mic or calipers at least and a simple thread pitch gage.  I would cut off the damaged part of the rod so you don't damage the thread in the puller body when backing it out and then either replace with an off the shelf item or find a good machinist with a lathe to match it for you.  If the body threads are damaged but not totally dead, I would do the same process and then find a thread chaser or tap to see if you can restore them first, before taking more drastic measures as posted above.  And after you fix it, make sure to use lube on the threads anytime you use it to help avoid the issue.-DaveXMT304 with: 22A Feeder, or HF251 Hi Freq DC TIG air cooled
Reply:Im guessing that would be an acme screw, usually Higher quality pullers are.Do not argue with an idiot. He will drag you down to his level and beat you with experience.
Reply:Originally Posted by Josey Hi  I'm  not sure if this is appropriate  here  as it is more a  machinist  question. I have had this  Sealey  puller for ages.  But the threads  have got twisted  and  broken.  thethreaded  inside part  is ok  as the top two" of thread  works good  I  was looking for a new one as it was a very handy  puller.  But the only one's  I can find in that size  are on  ebay  UK  and the seller doesn't ship to Canada.  It is  250mm wide  and  200mm long.   I wondered  if it  would be possible to cut a newbolt for it?  It is a very fine thread.  But the centre seems  heavy enough to  drill and change to a  courser thread if that would be easier. I appreciate  any  suggestions .  Hope  Sam  might notice it?            Thanks
Reply:Most pulley puller use a extra fine thread. If do not have the cost can get hight.Even buying tap is costly. Dave Tap cost https://www.mcmaster.com/Taps/general-purpose-taps-9/thread-size~3-4-20/thread-type~unef/Pulley puller https://www.mcmaster.com/6340K32/ Originally Posted by scsmith42To answer your question, yes a good machinist could make a new screw on a lathe.  Typically pullers do not use a commonly available thread (that's not ACME thread), but most lathe's should be able to duplicate it.The bigger challenge will be cost.  An hour or so of machinist's time, plus the raw material, may cost more than what a replacement puller would be.
Reply:You may want look at hydraulic typehttps://www.harborfreight.com/5-ton-...ler-95326.htmlDave  Originally Posted by Josey Hi  I'm  not sure if this is appropriate  here  as it is more a  machinist  question. I have had this  Sealey  puller for ages.  But the threads  have got twisted  and  broken.  thethreaded  inside part  is ok  as the top two" of thread  works good  I  was looking for a new one as it was a very handy  puller.  But the only one's  I can find in that size  are on  ebay  UK  and the seller doesn't ship to Canada.  It is  250mm wide  and  200mm long.   I wondered  if it  would be possible to cut a newbolt for it?  It is a very fine thread.  But the centre seems  heavy enough to  drill and change to a  courser thread if that would be easier. I appreciate  any  suggestions .  Hope  Sam  might notice it?            Thanks
Reply:Use some anti-seize on those puller threads and they will hold up a LOT better, and work easier.IMPEACH BIDEN!NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINEGOD HELP AMERICA!“Freedom is never more than one generation away from extinction.We didn’t pass it to our children in the bloodstream".RONALD REAGAN
Reply:I realize you like the jaw design of your Sealy because it has served you well for years. If you are unable to repair yours, a 2 or 3 jaw puller from PosiLock will do the job. Notice the cage to keep jaws from spreading. A tube of extreme pressure lube is supplied for the screws. These  PosiLock are  all I used on the farm. Sent from my iPad using Tapatalk:
Reply:Thanks  everyone for their ideas and  suggestions.  I will take the puller into  the machine shop in our local townand hear what they say.   A new one is about  80 pounds  UK.  Which would be about  $140  Canadian.  With  shiooing and  customs  duties  probably over $200.   Lis 2323.  I do have a  posi lock  Puller.  It is  a 208  Two legged  puller.  I think it opens  12'.  It is a far stronger  and better puller than the  sealey.   But out of my selection of pullers  I mostly use the sealey  as I find it very quick and handy to use,  I  am  very envious  Of  your collection of  pullers though.  A  lot of moneys  worth of  tools  there.
Reply:The first thing I would probably do is run a die over the threads and see if I could straighten them out.  That's if you could purchase the die reasonably.
Reply:Originally Posted by wayne55The first thing I would probably do is run a die over the threads and see if I could straighten them out.  That's if you could purchase the die reasonably.
Reply:Originally Posted by JoseyThanks  everyone for their ideas and  suggestions.  I will take the puller into  the machine shop in our local townand hear what they say.   A new one is about  80 pounds  UK.  Which would be about  $140  Canadian.  With  shiooing and  customs  duties  probably over $200.   Lis 2323.  I do have a  posi lock  Puller.  It is  a 208  Two legged  puller.  I think it opens  12'.  It is a far stronger  and better puller than the  sealey.   But out of my selection of pullers  I mostly use the sealey  as I find it very quick and handy to use,  I  am  very envious  Of  your collection of  pullers though.  A  lot of moneys  worth of  tools  there.
Reply:How do use a 12 foot puller?Dave  Originally Posted by JoseyThanks  everyone for their ideas and  suggestions.  I will take the puller into  the machine shop in our local townand hear what they say.   A new one is about  80 pounds  UK.  Which would be about  $140  Canadian.  With  shiooing and  customs  duties  probably over $200.   Lis 2323.  I do have a  posi lock  Puller.  It is  a 208  Two legged  puller.  I think it opens  12'.  It is a far stronger  and better puller than the  sealey.   But out of my selection of pullers  I mostly use the sealey  as I find it very quick and handy to use,  I  am  very envious  Of  your collection of  pullers though.  A  lot of moneys  worth of  tools  there.
Reply:Originally Posted by smithdoorHow do use a 12 foot puller?Dave
Reply:Looks like good puller Lot quicker that old type.Dave  Originally Posted by SweetMKWith a 13 foot hand!! I would adapt it to a hydraulic cylinder like sold by Porta-Power,, then live happily after,,https://www.amazon.com/Porta-Power-H...47081414&psc=1