Machinist question

[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. the
threaded 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 new
bolt 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

[Mac's Crew]

Thread insert

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[smithdoor]

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

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. the
threaded 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 new
bolt 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

[smithdoor]

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.

Thread insert

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[Welder Dave]

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.

[G-ManBart]

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.

Why 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?

[M J D]

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.

[farmersammm]

https://www.mcmaster.com/bearing-puller-forcing-screws/

[MinnesotaDave]

Why 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?

Definitely the route I would take. Simple solutions first

[Denis G]

Here's a chart of both metric and standard machine screws:
https://www.bestmaterials.com/PDF_Fi...crew-sizes.pdf

It likely that the screw is metric since the manufacturer is in the UK

Putting 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.

[davec]

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.

[idacal]

Im guessing that would be an acme screw, usually Higher quality pullers are.

[scsmith42]

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. the
threaded 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 new
bolt 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

To 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.

[smithdoor]

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/

To 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.

[smithdoor]

You may want look at hydraulic type

https://www.harborfreight.com/5-ton-...ler-95326.html

Dave

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. the
threaded 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 new
bolt 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

[CAVEMANN]

Use some anti-seize on those puller threads and they will hold up a LOT better, and work easier.

[Lis2323]

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.


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[Josey]

Thanks everyone for their ideas and suggestions. I will take the puller into the machine shop in our local town
and 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.

[wayne55]

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.

[CAVEMANN]

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.

IMO, if you straighten those threads enough to use it as a puller it will get part way through the yoke & gall the threads and probably screw up the threads in the yoke.

[Welder Dave]

Thanks everyone for their ideas and suggestions. I will take the puller into the machine shop in our local town
and 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.

Wow a puller that opens 12 feet. You could use that on some the the things Mesta made. Having a machine shop do all the work may cost as much or more than a new clamp.

[smithdoor]

How do use a 12 foot puller?

Dave

Thanks everyone for their ideas and suggestions. I will take the puller into the machine shop in our local town
and 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.

[SweetMK]

How do use a 12 foot puller?

Dave

With 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

[smithdoor]

Looks like good puller
Lot quicker that old type.

Dave

With 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