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Old 3rd March 2014, 08:23 AM   #21
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A bit blue peter, but this took 5mins. Magnets attach to the screw heads and the cloth is an old set of boxers. But when the idea hit me I had to grab what was close to hand.
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Old 3rd March 2014, 08:26 AM   #22
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Few more
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Old 3rd March 2014, 08:27 AM   #23
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Apparently only allowed one pic per post.
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Old 3rd March 2014, 08:49 AM   #24
McDark is offline McDark  Russian Federation
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Great idea Lorien (but I'm afraid I've seen this made by other member before). This way it could even utilize existing mould.
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Old 3rd March 2014, 09:08 AM   #25
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Quote:
Originally Posted by lorienblack View Post
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Fab idea - well done!
Mark.
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Old 3rd March 2014, 09:11 AM   #26
JoeyGS is online now JoeyGS  Philippines
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Great work and quick thinking lorien!

Mark, you may have outer ring/rims that has not passed QC for the CHR70.3 drivers ....... I am willing to buy and turn them into grills!
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Old 3rd March 2014, 09:14 AM   #27
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Quote:
Originally Posted by paul burchell View Post
Grills are still the one thorn in our side element of our designs also, a nice round fitted one would be so nice.
Also on the topic of flush mounting the frames, not having them at standard measurements (1/8",1/16" etc) complicates things when using a store bought circle jig
Hi Paul, (Guys)
Hope you're doing alright (snowed in still?). Re the circle jig, the hole cut out diameter for this new is planned to be 100mm. The driver minimum fit clearance is 99mm. So am I right in thinking that it should be relatively easy to cut a 100mm Dia. hole in your parts of the world (SI International as rather than Imperial)?

At this moment in time, I'm working on a material up-grade to a GF30/45 (Glass Fibre) mix allowing me to reduce the front mounting rim thickness to 3-mm. For those who wish to recess, is a 3-mm depth OK to do?

Thanks
Mark.
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Old 3rd March 2014, 01:11 PM   #28
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I can't see any issue with 3mm; if the front of the bezel is tapered toward the outer edge anyway (sorry, probably mentioned if this or similar is the case above but having a brief mental block) I doubt there would be much value in it, aesthetically speaking in any case -arguably it would look less attractive than surface mounting them.
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Old 3rd March 2014, 03:51 PM   #29
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IMO, which I presume is the reason for this exercise:

Surface mount frames need to look like surface mount frames. If you look at any of the Alpair frames without the bessel, they look totally unfinished if surface mounted, regardless of flange thickness. To present properly, the edge of the frame needs to have a radius or chamfer to smooth the transition into the baffle. Even with the Alpair bessels, I am inclined to adjust the rabbet depth so that the radius on the bessel stands proud of the baffle.

Therefore, my recommendation is that you put a 1.5mm 45* chamfer on the 3mm flange. This would present an issue to those who would rabbet the 3mm flange flush. The edge of the flange would be recessed. But this is my post. I note that some insist on rabbeting drivers that are clearly intended to be surface mounted such as those on my web site that start with “F”.

Making frame diameter an even fraction in Imperial measure is something of a red herring. Come of Americans! Realize that the World has moved on. You will be hard pressed to any driver anymore that is dimensioned in Imperial. Your Jasper Jig is at best only going to be close. There are techniques to make the Jasper Jig work at any diameter, but they are kludgy. Get a circle jig that is infinitely variable. PM me for my personal choice.

Bob
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Old 3rd March 2014, 04:36 PM   #30
chrisb is offline chrisb  Canada
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Bob - care to weigh in on the subject of grilles? - which I think is independent of number / make of drivers employed.
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