Widen shaft thread by tapping

A

asbani

AzB Silver Member
Silver Member
Hi guys, I have a 3/8x10 shafts and butt , but the shaft don't go in because it is slightly smaller as I need to widen the thread to make it go in, I'm not cue maker or anything I ask is it possible to do it myself or is there any dangor of ruining anything and if I can please advise me what tools I need to buy to do it, I don't have any cue maker or repairman in the town.

The reason why the shaft thread is right because I got it from Japan and the butt from America , I learned that America tend to make the pine wide , thanks
 
Try waxing the threads heavily then screw in and out till it seats all the way .

Try waxing the threads heavily then screw in and out till it seats all the way .

asbani said:
Hi guys, I have a 3/8x10 shafts and butt , but the shaft don't go in because it is slightly smaller as I need to widen the thread to make it go in, I'm not cue maker or anything I ask is it possible to do it myself or is there any dangor of ruining anything and if I can please advise me what tools I need to buy to do it, I don't have any cue maker or repairman in the town.

The reason why the shaft thread is right because I got it from Japan and the butt from America , I learned that America tend to make the pine wide , thanks
Click to expand...
 
asbani said:
Hi guys, I have a 3/8x10 shafts and butt , but the shaft don't go in because it is slightly smaller as I need to widen the thread to make it go in, I'm not cue maker or anything I ask is it possible to do it myself or is there any dangor of ruining anything and if I can please advise me what tools I need to buy to do it, I don't have any cue maker or repairman in the town.

The reason why the shaft thread is right because I got it from Japan and the butt from America , I learned that America tend to make the pine wide , thanks
Click to expand...

A 3/8-10 tap is not standard. It would cost more to buy one than have some else do this for you. If you shaft will not go at all then there are a few possibilities. First, is it the correct shaft for that cue? Second, is the pin bent on that cue? If you are satisfied that it is the correct shaft and or thread pitch and the pin is not bent then have the shaft re-tapped.

Jim.
 
Thanks Jim, yes it is not bent, and it is correct shaft for the cue, I have other shafts before that had the same problem that now are fitting perfectly after tapping the shaft thread, some guy did it to me but he is out of the country right now, it just need tap to widening the shaft thread thats all, but if it is costy to buy the tools to do it, then I'll have to wait I guess.
 
You need to increase the minor dia.

Mcmaster Carr sells chucking reamers in every size incremental by .0005.
 
scdiveteam said:
You need to increase the minor dia.

Mcmaster Carr sells chucking reamers in every size incremental by .0005.
Click to expand...

Hey Rick,
All though this may possibly be the solution I think this is bad advice. A screw thread's fit is based on the pitch diameter not the minor diameter. The minor always has clearance. The exception to this rule would be the modified 3/8 pin with the flat root in which the fit is established by the root diameter. There is no way to determine the correct way to do the repair with out further info.
 
A picture of the pin itself will give us a better idea as to what advice to give, as there are different types of 3/8x10 pins. What I do is use the same typeof pin, grind a slot lengthwise on it. Then thread that thru the shaft all the way in. Usually cleans enough clearance in the hole.
dave
 
Canadian cue said:
Hey Rick,
All though this may possibly be the solution I think this is bad advice. A screw thread's fit is based on the pitch diameter not the minor diameter. The minor always has clearance. The exception to this rule would be the modified 3/8 pin with the flat root in which the fit is established by the root diameter. There is no way to determine the correct way to do the repair with out further info.
Click to expand...

Thanks CC,

I stand corrected I do use the 3/8 14 tpi modified and utilize a stepped minor in my shaft treading method. I did not know it was selective and non standard.

Rick
 
Thanks for all the advice given all of it is appreciated, but I just found some guy who lives near by and have a lathe and said that he could do it, I went to him and his method was to put the shaft in the lathe, then in the other side he put something that looks like this in the photo.

http://image.made-in-china.com/2f0j00SCYabNjKkuks/Drill-Bits-Series-FD-H001-.jpg

one of them, then he kept it stand still while the shaft itself was turning around with the lathe, then gentely he inserted that tool inside to widen the hole a little bit, and end result was that the shaft fitted in the cue to the end, so I think the method worked, even though it isn't any method that you guys stated but it worked, shaft is not too tight when you scroll it to the cue, but when you lock it at the end it is flush and good to me.

by the way is this method an approved one, or is it risky using that tool because it wasn't a 3/8x10 pin used to widening it.
 
Sounds like he widened the minor dia. of the hole. The pic you showed, those are drills, not taps so it sounds like the pin has a larger minor than other 3/8 pins. Glad it worked out.
Dave
 
Sometimes the holes close up alittle because of moisture, drill with 5/16 and it should fix the problem. I have that problem with dymondwood as I use a .308 flat pitch pin and if I drill with .307 the pin will not fit so I have to drill again with .312 or 5/16 and it works fine. On maple I do not have to do this.
 
You must log in or register to reply here.
Back
Top