Steyr
133
Seems rather hard especially for the "gain".
Dec 17, 2021,21:42 PM
Considering classical screws. Normal assembly is the mainplate that is threaded with the bridge on top maintained through a recess with the screw head. Let's consider an S1 (1mm diameter screw). The pitch is 0.25mm. This means that one single hundred (0.01mm) of tolerance in one thickness will turn into 7.2 degrees of orientation error in the screw slot (180°/25). For this basic assembly, the potential errors will come from the mainplate, the screw head and the bridge. Hard to maintain less than a few hundreds of tolerance on this accumulation of parts.
Of couse, we would have to consider the torque used since material is relatively soft and will deform while screwing. And that is still a simplified approach. So classical screw is not really the best option.
Changing from a classical screw slot, to some kind of torx or Allen would "improve" the alignment issue by reducing the orientation error by a 3 factor.
One could use bolts rather than screws.
Or possibly have the assembly reversed : screw head under the dial and the bridge would be threaded rather than the mainplate and non-through hole.
Well I am rather happy with the way the screws look like today, even misaligned.
Comments:
view entire thread
Movement Screw Head Alignment
By: enjoythemusic : December 17th, 2021-20:13
As a self-admitted OCD type, I admire drawings where the movement screw heads are all aligned. So my questions are, does any mechanical timepiece manufacturer actually do this, and if not, how hard could it really be? ...
Good reads...
By: enjoythemusic : December 17th, 2021-20:59
Both articles are nice, and as sad as this sounds i thought about this years ago and did enquire to a manufacturer of this possibility. While it does add labor, how much depends on the 'organization' of the screws. It would mean indexing screws delivered ...
I could be wrong but...
By: Gregineugene : December 17th, 2021-21:32
I count 19 screws in this illustration and only 12 of them are aligned (at about a 45° angle). So even an artist who's not actually screwing them in is only at about 36% accuracy. Maybe it really IS difficult in practice...
Seems rather hard especially for the "gain".
By: Steyr : December 17th, 2021-21:42
Considering classical screws. Normal assembly is the mainplate that is threaded with the bridge on top maintained through a recess with the screw head. Let's consider an S1 (1mm diameter screw). The pitch is 0.25mm. This means that one single hundred (0.0...
Incredible Knowledge!
By: enjoythemusic : December 17th, 2021-23:52
Seems you've given this thought. Wow, it is quite the challenge! Great post, all help is appreciated.
HARD.
By: mtvandi : December 18th, 2021-01:46
The larger the screw, the better (like in a gun/ rifle or bigger), but movement screws are small plus fragile and the more you over torque them the more they deform the slot to the point of actually breaking below the head. The fact that slotted and heate...
Excellent Points
By: enjoythemusic : December 18th, 2021-02:42
You are right of course, at these 'micro' levels there's a higher chance for undesirable material deformation on either side of the mating. Many great posts on this thread. Maybe it's a materials-based solution on the bolt side of the equation. If the ass...
Coupler Nut.
By: mtvandi : December 18th, 2021-03:08
That is one way!
Yes Indeed
By: enjoythemusic : December 18th, 2021-12:13
Yet i think that would add height to the assembly (?).
Yes! WOW!!!
By: enjoythemusic : December 18th, 2021-12:20
Wow, that is a beautiful automobile! Most impressive! Side Bar: Back in the day i judged pro-level IASCA car audio competitions with Technical Editor Bill Burton. Mainly did sound quality judging, yet also enjoyed occasionally judging installations. It wa...
