Correct tap for 7mm tube

[Fraist]

Keep in mind you want to go deep enough to seat the tube deep enough.

If you don’t, the crown will stick out from the case and look off.

I don’t have a set depth, but rather I test the tube frequently until it’s at the depth that allows the crown to seat properly.

Here’s one I just did. 120 degree 4mm chamfer.

Thank you for the picture. The sealing needs a lot of pressure to be watertight?
Can you also share a picture without the tube to see the opening ?

 

[Zeta7]

Keep in mind you want to go deep enough to seat the tube deep enough.

If you don’t, the crown will stick out from the case and look off.

I don’t have a set depth, but rather I test the tube frequently until it’s at the depth that allows the crown to seat properly.

Here’s one I just did. 120 degree 4mm chamfer.

What case is that a clean or BP?

 

[PsychoTee16]

Don’t torque it too much. You’ll strip the internal ribs used for your key tool.

Pic of a gmt I did.

 

[PsychoTee16]

What case is that a clean or BP?

Clean 126710.

 

[Zeta7]

Clean 126710.

Sweet. I’ve got one and was thinking about having the movement Frankensteined when it gives up the ghost.

 

[drvintage]

Hey guys, do someone know the crown thread measurements?

 

[MDswimmer]

If there are more people interested i believe makes sense to place an order.

Hi Fraist, did you still need 6 people to buy in the US For the 3.0 X .30 tap? And I have a case that 3.0 X .35 do I just run the 3.0 X .30 tap to retread?

 

[MDswimmer]

As you all have found out, nearly every tap offered on the market for these tubes is indeed incorrect. People will say they work, but they don’t.
The tubes get way too tight after a few turns on the wrench.

The correct tap size is : M3.05x.30-4H

Daytona pushers on the other had, do have options available on the market. That tap size is M2.5x.25, and can be found on CousinsUK.

I’ve had these made via the same USA manufacture as listed above and they turned out great.
Gen tubes thread in with no issues.

Couple pics

As you all have found out, nearly every tap offered on the market for these tubes is indeed incorrect. People will say they work, but they don’t.
The tubes get way too tight after a few turns on the wrench.

The correct tap size is : M3.05x.30-4H

Daytona pushers on the other had, do have options available on the market. That tap size is M2.5x.25, and can be found on CousinsUK.

I’ve had these made via the same USA manufacture as listed above and they turned out great.
Gen tubes thread in with no issues.

Couple pics

When retaping from m3x.35 threads to m3x.30 is there anything needs to be done?

 

[Karbon74]

Guys

I need some advice
When you tap, do you hold the case in hand or do you secure it in a vice and table?

 

[HulkyGalore]

5513 rebuild with old-crowns custom case

Update: I messed up and ended up stripping the threads on a gen sealed 7030 tube trying to get it in. Probably the wrong thread pitch or I marred the internal threads. Regardless. I’m gonna quit while I’m ahead and send the case off to someone to weld and re-tap then counterbore the case. Rather...

forum.replica-watch.info

 

[tbandy]

Guys

I need some advice
When you tap, do you hold the case in hand or do you secure it in a vice and table?

I have done it both ways but I think it's better to hold the case on a vise

 

[PsychoTee16]

Guys

I need some advice
When you tap, do you hold the case in hand or do you secure it in a vice and table?

In a vise. Then you can focus on tapping straight.

 

[ward1991]

Guys

A vise is probably the best advice, but honestly, I've done so many in hand that I probably would never switch. I can only recall one where it was cockeyed a little but I couldn't really tell by the time I got it all together.

I like to be sure to back the tap out if I feel any resistance to clear shavings

I also ream/drill tube holes to larger diameters with my cordless drill, with the case on the edge of the table

I also use 45 degree countersinking bits in my cordless too when tubes need to be recessed, but it only takes 1 quick squeeze to accomplish.

 

[Labedudel]

i am 100% sure I used the correct tap. I have tested 3 different tap sets the last months. With all I have the same problem.
The taps that i used above 3x0.35 and 3x0.25

For the right drill for your thread, here as an example M4, you have to calculate the pitch 0.7 (thread pitch). Here the drill would be a 3.3mm drill, the right one for pre-drilling, then you could cut your M4 thread. There are also tables for this, just google it.
What else should be taken into account is not to confuse a thread cutter with a thread former. I hope I could be of some help.

 

[Karbon74]

So I did the tap today using this

https://www.cousinsuk.com/product/tap-holders-horotec-swiss?code=R44748

And a bench mini clamp

I used some Heller cutting paste
It cut like butter with almost no force

Perfect fit for a rep tube

 

[Zeta7]

Great information @Karbon74. Thanks for wising us up to the right tool and where to get it from.

 

[Karbon74]

So I did the tap today using this

https://www.cousinsuk.com/product/tap-holders-horotec-swiss?code=R44748

And a bench mini clamp

I used some Heller cutting paste
It cut like butter with almost no force

Perfect fit for a rep tube

Interestingly the tool listing says 6mm crown, but I used it on a 7mm rep crown and tube

M3x0,35

 

[PsychoTee16]

So I did the tap today using this

https://www.cousinsuk.com/product/tap-holders-horotec-swiss?code=R44748

And a bench mini clamp

I used some Heller cutting paste
It cut like butter with almost no force

Perfect fit for a rep tube

How was the resistance when installing the Gen tube?

That thread pitch is incorrect and doesn’t match the Gen threads.

 

[Karbon74]

How was the resistance when installing the Gen tube?

That thread pitch is incorrect and doesn’t match the Gen threads.

it was not a gen tube.
it was a rep at 0.35 thread, so it went in no issue

 

[PsychoTee16]

it was not a gen tube.
it was a rep at 0.35 thread, so it went in no issue

Ohhh okay!! My apologies.