Threading pool cue butt

[eddie8842]

I'd like to fit my predator extension to my new cue, so I was wondering if an m20x1.5 tap would be ok to make threads or if it would just tear out?
I'd tap and die a male m20x1.5 female m16x1.5 adapter, but I don't want to just tear it all out trying to tap it with a metal tap.

 

[rack runner]

m20 and m16 is different diameters though right? pred bumper threads are m16-1.5

 

[DeeDeeCues]

m20 and m16 is different diameters though right? pred bumper threads are m16-1.5

Yeah, he is talking about making an insert, threaded male M20x1.5 with a female M16x1.5.

I'd like to fit my predator extension to my new cue, so I was wondering if an m20x1.5 tap would be ok to make threads or if it would just tear out?
I'd tap and die a male m20x1.5 female m16x1.5 adapter, but I don't want to just tear it all out trying to tap it with a metal tap.

What is the diameter of the existing hole? The plastic should thread fine. As long as the plastic isn't an acetal, you would likely be fine omitting the external threads on the insert and epoxying, but that would mean machining it out if you ever wanted to go back to original.

 

[eddie8842]

Yeah, he is talking about making an insert, threaded male M20x1.5 with a female M16x1.5.



What is the diameter of the existing hole? The plastic should thread fine. As long as the plastic isn't an acetal, you would likely be fine omitting the external threads on the insert and epoxying, but that would mean machining it out if you ever wanted to go back to original.

It's about 18.5mm, should fit the m20 well.
I'll try it and hope it's not an acetal, fingers crossed.
I appreciate your advice.
Thank you.

 

[rack runner]

sorry. i didnt underatand the question. up, s'long as theres enough meat to glue the plug and to tap, should be okay. like eddie said, just not delrin. phenolic, nylon ahuld work.

 

[DeeDeeCues]

It's about 18.5mm, should fit the m20 well.
I'll try it and hope it's not an acetal, fingers crossed.
I appreciate your advice.
Thank you.

If it is acetal, it should tap beautifully. Acetals just don't glue well, so you might have to get a special adhesive or be creative and stake the insert to the butt sleeve.

Apologies for any confusion.

 

[eddie8842]

If it is acetal, it should tap beautifully. Acetals just don't glue well, so you might have to get a special adhesive or be creative and stake the insert to the butt sleeve.

Apologies for any confusion.

Oh ok, got it, and thank you for that clarification, I definitely misunderstood the first comment

 

[eddie8842]

sorry. i didnt underatand the question. up, s'long as theres enough meat to glue the plug and to tap, should be okay. like eddie said, just not delrin. phenolic, nylon ahuld work.

Here's hoping I don't mess it up too bad haha, although all I'm really after is function

 

[eddie8842]

So, I'm not quite sure where to go from here.
Couldn't really tell before but it already had this plastic threaded piece, and in trying to tap it, it came out and was so thin it cracked, so I just took out the ridiculous 4oz weight bolt too, odd size 7/16-14
Any ideas?
I'm guessing send it off to a capable cue maker is the next course of action?

 

[DeeDeeCues]

So, I'm not quite sure where to go from here.
Couldn't really tell before but it already had this plastic threaded piece, and in trying to tap it, it came out and was so thin it cracked, so I just took out the ridiculous 4oz weight bolt too, odd size 7/16-14
Any ideas?
I'm guessing send it off to a capable cue maker is the next course of action?

Well, shoot. Always something, sometimes it's two things.

Can you measure the threads on the insert that broke?

What are your fabrication capabilities?

 

[Michael Webb]

If it is acetal, it should tap beautifully. Acetals just don't glue well, so you might have to get a special adhesive or be creative and stake the insert to the butt sleeve.

Apologies for any confusion.

Creative!

 

[Michael Webb]

So, I'm not quite sure where to go from here.
Couldn't really tell before but it already had this plastic threaded piece, and in trying to tap it, it came out and was so thin it cracked, so I just took out the ridiculous 4oz weight bolt too, odd size 7/16-14
Any ideas?
I'm guessing send it off to a capable cue maker is the next course of action?

There is no standard sized weight bolt anymore

3/8x16 is probably still more common but far from Standard .

 

[DeeDeeCues]

Creative!

Liquid staking, I love it!

 

[eddie8842]

Well, shoot. Always something, sometimes it's two things.

Can you measure the threads on the insert that broke?

What are your fabrication capabilities?

It's approximately m22x2.0
And my fabrication capabilities are non existent at this point, been mostly working with taps and dies, knives and glue for tip repair work, sold my lathe a few years ago but it's wasn't that capable anyway

 

[eddie8842]

There is no standard sized weight bolt anymore

3/8x16 is probably still more common but far from Standard .

That would've been a lot easier, could've just thrown one of these in there and been done with it

 

[Michael Webb]

Ever he

That would've been a lot easier, could've just thrown one of these in there and been done with it

Ever hear of Apples and Oranges,
Who wants a Banana!

 

[eddie8842]

Ever he

Ever hear of Apples and Oranges,
Who wants a Banana!

You said it