[time-nuts] Bye-Bye Crystals

Bob Camp kb8tq at n1k.org
Mon Mar 13 18:19:16 EDT 2017


…. ummm …. errr … Add to that:

X-ray gear to work out the orientation of the (possibly natural) bar you are sawing
Lapping gear to get the blanks flat (as optically flat)
Automated / sorting X-ray gear to figure out what’s what after they are lapped 
Rounding equipment to turn the square ones into round ones without damaging them
Contouring gear to put the proper shape on one or both sides (or pipes)
Polishing gear to finish the shaping process
Etching baths to get the surface to it’s final condition 
High vacuum cleaning to get all the crud off of all the parts before you do much of anything with themA base plater to put on the initial electrodes
Mounting fixtures to get the crystal into the holder
Cement curing (generally vacuum based) gear
Plate to frequency gear 

That’s a short list, there actually is a bit more on a full list. The cleaning gear can get pretty extensive depending on the end application. 


> On Mar 13, 2017, at 3:56 PM, Attila Kinali <attila at kinali.ch> wrote:
> On Mon, 13 Mar 2017 15:01:39 +0000
> Adrian Godwin <artgodwin at gmail.com> wrote:
>> What minimal equipment would you need to make your own crystals ?
> The equipment is quite minimal:
> * A diamond precision saw to cut the crystals
> * Some tool to check the accuracy of the cut (orientation and thicknes)
> * a lapping/grinding machine
> * an electroplating machine (usually sputtering) for the electrodes.
> * either some machine to produce the crystal holder yourself or buy them
> * vacuum system to evacuate the crystal holder and to bake everything
> * something to (cold) weld the case close
> All of this can be put in a (relatively) small workshop.
> The difficulty is also not producing quartz crystals
> in holders. The difficulty controlling the whole process
> to such an degree that you get high quality crystals
> at the frequency you want.
> If you managed to do that, you can further improve
> your system by using a BVA[1,2] like geometry, where
> the electrodes are not on the resonator itself but
> on the surrounding crystal, which acts at the same
> time as holder.
> But be warned, many attempted to re-create the BVAs
> but few succeeded... and none but Oscilloquartz ever
> managed to produce a economically viable product.
> 			Attila Kinali
> [1] http://www.nature.com/articles/srep02132/figures/1
> [2] http://www.nature.com/articles/srep02132/figures/2
> -- 
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