[bry1975]

Chaps,

Am thinking of having some custom SKX crown machined what style knurl pattern(s) should I spec? :grin:

Tar

Bry

 

[mrwozza70]

Nice idea there really isnt much available aftermarket to mod SKX crown. Anything rough tough looking - the bottom row on the 3rd down would be nice. Maybe signed with an 'S' on the end

If you are planning on making a few extras to recoup outlay then I would take a couple for sure.

 

[LongBike]

Now someone has been burning the night oil

That's what it takes , we need those custom ones.
I go along with .... mrwozza . Second picture they are
great, and all can be used also.

Now to find the ..... " Down Load Printed Ordering Forms ",
for them.
Now bry , you are not going to get any sleep since you
have shown those ............:34::s_laugh::13::sigh:

That's what I have been fooling with on and off and have
made some too. I also did a couple like those ........
( 5M62-Kinetic Crowns ), that have the shrunken nylon insert
rings on them with different colors. The rings took some time to
get made, but not impossible to do.

 

[bry1975]

Solidworks 3D SKX crown>>>

I've got the SKX crown drawn up just need to check a few important dimensions once I've collected my German digi calipers.

 

[7s26b]

So did you work out the thread sizes? my SKX007 crown tube is 3.5mm diameter. I don't have a pitch gauge fine enough to measure the threads.

 

[ClockBloke]

So did you work out the thread sizes? my SKX007 crown tube is 3.5mm diameter. I don't have a pitch gauge fine enough to measure the threads.

I just measured my friends SKX I have here to refinish the case and it's metric 3.5 x .35 if that helps you modding types

 

[7s26b]

I thought it might be the same as a 6309 divers - now we know! cheers

 

[briang]

Double knurl for me. The bottom one looks the ducks nuts.

 

[7s26b]

Something like this, or slightly more coarse would be good. And as mentioned above - a signed "S" would be nice.

 

[bry1975]

re

Tony,

I've just measured the SKX007 male threads at 3.90mm which surely means a M4 thread?

 

[7s26b]

I just remeasured mine with a micrometer and loupe, says 3.91mm - looks like the mic was measuring the tube step down previously (my eyes are obviously not what they once were!)

 

[bry1975]

re

And it appears a 15BA tap is equivalent to a M0.9 x 0.21 :grin::grin:

 

[ClockBloke]

Tony,

I've just measured the SKX007 male threads at 3.90mm which surely means a M4 thread?

Yeah I've had a word with my mate and he's is a 'custom' made watch. He said the crown was not standard! I wish he'd told me that in the first place!!!!

I was about to write about BA taps but you beat me too it Bry1975! I often use B.A to tap out small metric threads as I have a heap that I use on the old clocks and they often are the same as metric taps and dies.

 

[7s26b]

I think you need to use a pitch gauge on the thread, it's no surprise that the diameter is similar to BA, as the BA system is actually Metric based (Swiss watchmaking threads) .
A 0.21mm pitch, when the norm is 0.35mm, seems odd - could be wrong though.

 

[ClockBloke]

I think you need to use a pitch gauge on the thread, it's no surprise that the diameter is similar to BA, as the BA system is actually Metric based (Swiss watchmaking threads) .
A 0.21mm pitch, when the norm is 0.35mm, seems odd - could be wrong though.

Will hop out to the workshop and measure a BA 15 in a mo

 

[7s26b]

I should add that- I was referring to it being odd that the pitch on the crown would be 0.21 (as opposed to 0.35), rather than the 15BA thread

 

[7s26b]

The tap drill for M4 x 0.35 is 3.6mm , M4 x 0.5mm is 3.5mm. So, considering I measured the root diameter first at about 3.5mm, I reckon it's going to be 0.35 or 0.5 pitch.

 

[bry1975]

re



Good news the SKX crown is DEF an M4 thread!

 

[7s26b]

That is good news have you sussed the pitch?

 

[bry1975]

re

Yes but not saying. :grin: