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  • Plumbing Rookie
    started a topic Threading Pipe

    Threading Pipe

    I am trying to thread a 1-1/4 pipe and have new inserts in a ridgid manual threader. I have only been able to satisfactorily thread the pipe to the end of the inserts. This would seem find expect it only allows me to thread the fitting on about 1.5 turns. As soon as I try to take some additional turns past the end of the inserts, the pipe bends inward due to the extra load. Any ideas what I am doing wrong? Based on the length of thread on a pipe I purchased from Lowes, I need to thread the pipe about an additoinal 1/4 in.

  • OkieBill
    replied
    Re: Threading Pipe

    Could the dies be in the head backwards (not in wrong holes but facing wrong direction in the holes). I had one in backwards once talk about a head scratcher though that was in a a power threader...

    Okie

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  • toolaholic
    replied
    Re: Threading Pipe

    I also weld ,Tap Magic is to thin for pipe!

    Leave a comment:


  • JERRYMAC
    replied
    Re: Threading Pipe

    IF YOU ARE NOT DOING THIS FULL TIME LIKE US REAL PLUMBERS,
    YOU CAN MAKE A POOR MANS OILER BY GETTING ANY KIND OF BUCKET EVEN A 5 GALLON PLASTIC BUCKET, AND A OLD STANDARD OIL SQURT CAN
    WITH A SECOND PERSON OILLING YOUR PIPE AS YOU WORK,

    BUT YOU MUST USE HEAVY OIL, I HAVE NO IDEA WHAT THE WEIGHT OF TAPPING OIL IS, IN A PINCH ON 1/2" OR 3/4" I HAVE EVEN USED MOTOR OIL
    BUT TO DO IT RIGHT AND ALSO TO PROTECT YOUR DIES YOU MUST USE THREAD CUTTING OIL

    Leave a comment:


  • smorris
    replied
    Re: Threading Pipe

    Originally posted by Plumbing Rookie View Post
    About how much oil do I need to use?

    What are you using to apply the oil? You are supposed to use something like the 418 Oiler. The bucket goes under the pipe you are threading to catch the chips and excess oil. The gun pumps the oil out of the reservoir onto the dies. You should fully cover the pipe before you start threading, then as you thread, just keep flooding the dies with the oil. (pump, pump, ratchet, pump, pump, ratchet, etc.) You use a lot, but it is all recovered by the 418 Oiler bucket.

    I'm not sure, but it sounds like you are using dies with 3-4 teeth missing, or did you get new dies? New dies and a good flood of oil, and you should end up with beautiful threads. I'm guessing you are not using enough oil, plus, you are using the wrong type of oil.

    Hope that helps,
    Steve

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    About how much oil do I need to use?

    Leave a comment:


  • PLUMBER RICK
    replied
    Re: Threading Pipe

    technically you're not tapping the pipe.

    try a heavier oil. try the ridgid nu-clear thread cutting oil.

    as others stated, buy a factory nipple and adjust the dies to the factory threads.

    rick.

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    Yes, I have confirmed that I am using 1 1/4" NPT. At first I was only using "Tap Magic" cutting fluid. On the last attempt, I used a heavier cutting oil called "VALTAP"--it says it should be used for tapping blind holes. I like it much better as it stays on the tool and pipe longer.

    Leave a comment:


  • paul_02blue
    replied
    Re: Threading Pipe

    It is possible that you can get good threads on the first part of the pipe and not have enough or the right kind of oil to finish it up well.

    What kind of oil are you using?
    Also I know this sounds strange but are you sure your fitting is a 1 1/4" NPT?

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    That is how they are installed.

    Leave a comment:


  • cincy plumber
    replied
    Re: Threading Pipe

    They need to be 1,2,3,4 and be in slots on your die,1,2,3,4 in order for it to
    thread properly.

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    The pipe is ASTM A53A Schedule 40 Black Iron.

    Have you ever seen a die head go bad? I purchased this set used and all of the dies were in good shape, except for the 1-1/4, which had teeth on 3 of the 4 dies broken. The old dies also have different numbers on the ends of two of the dies. One has 1 on one end and a 3 on the other, and the other has a 3 on one end and a 1 on the other. Also, I noted that the die head has one position that has three different numbers stamped on it; but, the other three positions only have one number so I matched the three I was sure of and by default the fourth one got installed in the position with three different number stampings.

    Leave a comment:


  • G3sprinklers
    replied
    Re: Threading Pipe

    what kind of pipe are you threading??

    are there any markings on the pipe itself??

    anything under a sch. 30 you will not be able to thread, the wall will be too thin and collapse.

    almost sounds like you have a piece of sch. 10 pipe or thinwall tubing.

    ASTM A-53 is good pipe, it has a welded seam and ASTM A-120 is seamless and a little on the hard side.

    Have found the foriegn pipe will have hard and soft spots in it.

    let us know what markings are on the pipe.

    G3

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    I am using new Ridgid 1-1/4 NPT HSS Dies, Cat # 37885

    Leave a comment:


  • Plumbing Rookie
    replied
    Re: Threading Pipe

    I have a Ridgid 12-R. I belive I am using enough oil, as I get a good finish on the thread with no tearing. I thought that maybe the dies weren't properly adjusted so I went and bought a short section of pipe from Lowes and threaded it into the dies until they were tight then I tightened down the screws. I think it is possible that they still aren't properly adjusted--is there a better way to ensure that they are seated. Also, I matched up the number on the dies with the numbers on the head--as best I can remember they were all sequential in a clockwise direction.

    Leave a comment:

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