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Large Tap

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Scott Ballentin

05-27-2000 02:17:13




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I am restoring a 1956 Ferguson 40 and need a large tap to restore the threads in the casting that houses the draft control Master Control Spring Assembly. The tap needs to be 2 3/4 inches with 12 threads per inch. Does anybody know where a guy can find stuff this big? Thanks to all.




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Scott Ballentine

06-29-2000 03:08:10




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 Re: Large Tap in reply to Scott Ballentine, 05-27-2000 02:17:13  
Just in case somebody come's back here to find out what happened. I got an e-mail from McMaster Tool. They have an internal thread restorer on page 2089 of their online catalog. www.mcmaster.com I ordered this tool for about $22 and a set of somthing like 20 different thread sizes for another $25. This thing is not a tap and wouldn't cut threads where there are none, but it worked like a charm on my damaged threads. I spent about 15 minutes working on them and had the large nut screwed in. McMaster shipped UPS the next work day and billed me soon after. They treated me fine and the tool is good quality. They get my vote for doing a good job and I'll remember them next time I need something odd.

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Fred

05-29-2000 12:32:48




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 Re: Large Tap in reply to Scott Ballentine, 05-27-2000 02:17:13  
My gosh, ain't none of you ever run a Mediteranean Milling Machine? Go to your local machine shop and have them cut you a 2 3/4-12 thread on a piece of mild steel long enough to do the job plus a little. Put some valve lapping compound on it and start screwing it back and forth. Don't force it too much, just a little at a time and let the abrasive do the cutting. Slow process but guaranteed results. You might even consider the threaded piece that came out of there to lap it with. Use a triangular file to touch up the threads on it if need be.---L8R----Fred

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Neal

05-28-2000 06:41:53




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 Re: Large Tap in reply to Scott Ballentine, 05-27-2000 02:17:13  
I forgot about thread files! There is an internal thread file which sells for about twenty bucks. The same company I mentioned earlier has them. Hope this helps a little bit more. Neal



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Dan from PA

05-27-2000 14:09:17




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 Re: Large Tap in reply to Scott Ballentine, 05-27-2000 02:17:13  
If you can't rent a tap this size and you don't want to buy, another option is to remove the entire casting and hope a local machine shop has a lathe big enough to swing the whole casting. They can clean up the threads for you. Is this a tapered (pipe) thread? If you don't need it to seal against pressure, a couple of hours with a Dremel tool or die grinder and a really small wheel may be good enough. Even if it is a pressure fitting, a liberal coating of JB Weld or other epoxy on both threads before assembly will probably make it seal. Thoroughly clean and de-grease both surfaces first, and don't plan on removing the peices ever.
Another thought just occurred to me. I've never tried this before, but you may be able to make your own 'single-use' tap from a grade 8 bolt (or heavy-wall threaded pipe) that has the same threads you're trying to clean. Cut three or four slots along the length of the bolt (on pipe, don't go too deep) with an abrasive cut-off wheel to give the cuttings some place to go (like a tap). Try to keep what will be the cutting edges sharp. If you know how to heat-treat steel for hardness, do that, too. It's worth a try. Just make sure you don't break off the thing in the hole. You'll run out of swear words real quick. Although with 2 3/4", you should have a lot more room to work with if this happens.

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Neal

05-27-2000 06:12:42




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 Re: Large Tap in reply to Scott Ballentine, 05-27-2000 02:17:13  
Well... you can get that tap from MSC the problem is it the cost. The tap is $203.41 (not including shipping) and it is an import. You can choose from starting, plug and bottoming tap. Their number is 1-800-645-7270 web site is www.mscdirect.com Good luck, Neal



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jimmyzz

05-27-2000 10:52:58




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 Re: Re: Large Tap in reply to Neal, 05-27-2000 06:12:42  
otc makes external tread chaser that works very well. It will do most any thread you will ever need. I think they run about 80 bucks.



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