Is there a 1.37 x 24 tpi threading die?
10-19-18, 11:35 AM
#26
Banned
FYI, (for newbies) , in mechanic's speak; a tap 1 and die 2 set.
1 cuts threads inside holes, 2 cuts threads on the outside of round things.
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1 cuts threads inside holes, 2 cuts threads on the outside of round things.
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10-19-18, 11:50 AM
#27
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10-19-18, 12:16 PM
#28
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hey mikewille,
I just found a die at Victor Machinery online for $53 that cuts a 1.375 x 24 tpi thread (60 deg) but the bloke I talked could not tell me what standard or height of the thread or anything. I guess if it is a 60 deg thread it would be forced to cut the standard cycle thread BSC. The only thing that could possibly be different would be the radii which is supposed to be .007", right? The thread height for the BSC thread is .0222. The picture shows very sharp tool peaks. One could always grind or file slightly if they were too sharp. I can measure it but not try to thread it into anything or chase something if I need to return it.
Do you think I could go wrong buying it? Another one costs double from MSC supply.
Feddiej2
I just found a die at Victor Machinery online for $53 that cuts a 1.375 x 24 tpi thread (60 deg) but the bloke I talked could not tell me what standard or height of the thread or anything. I guess if it is a 60 deg thread it would be forced to cut the standard cycle thread BSC. The only thing that could possibly be different would be the radii which is supposed to be .007", right? The thread height for the BSC thread is .0222. The picture shows very sharp tool peaks. One could always grind or file slightly if they were too sharp. I can measure it but not try to thread it into anything or chase something if I need to return it.
Do you think I could go wrong buying it? Another one costs double from MSC supply.
Feddiej2
That said, using a threading die on a bike hub is (as mentioned above) difficult as you run into the shoulder. One way to address this is to have three (or more) dies. The first one has a taper so that the first part of the die barely cuts anything. So you use this to start the thread. The part of the hub near the shoulder is barely threaded, You then use die number 2 die which cuts slightly deeper threads near the shoulder. Finish off with die number 3, which cuts nearly full thread depth up to the shoulder. In reality one uses a lathe (CNC or otherwise) or a geometric die head on a lathe.
Cutting new threads with a die can be difficult, as one can start the die off at an angle. Then you're screwed. I'd not put new threads on a hub without a lathe.
10-19-18, 02:43 PM
#29
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A venerable French manufacturer of tools for the bicycle trade:
https://www.vartools.com/en
However, I don't see the hub die in their latest catalog. With the industry having long since moved to "freehubs," it's entirely likely that they have dropped it.
As mentioned earlier, depending on what you're trying to accomplish, a thread file may be an adequate and far more affordable option.
https://www.vartools.com/en
However, I don't see the hub die in their latest catalog. With the industry having long since moved to "freehubs," it's entirely likely that they have dropped it.
As mentioned earlier, depending on what you're trying to accomplish, a thread file may be an adequate and far more affordable option.
10-19-18, 08:45 PM
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thank you, sir. Now I am feeling more and more like it is a bad idea to get in business... I really just enjoy working on classic bikes (from my child hood) I really want the die to be self sufficient in modernizing the older bikes.
10-19-18, 08:47 PM
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Just didn't know modernizing is apparently becoming more like Vintage-nizing the antiquities...
hell.. the "oldies" station on the radio plays music that peers listened to in highschool, if that dates me. Dang.
hell.. the "oldies" station on the radio plays music that peers listened to in highschool, if that dates me. Dang.
10-19-18, 09:31 PM
#32
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One thought might be to see how much it would cost to have a local machine shop make a short production run. I have a friend who makes a super specialized component for a musical instrument. He has a design drawing, and a reputable local shop has programmed it into their CNC lathe. They can run it when their machine has down time. Shops often have an idle lathe, and might be able to cut you a deal.
