Zaph, 36mm Forstner Bit...

critofur · 23rd April 2008, 05:17 AM

36mm Carbide Forsner bit

Not cheap, but, if I was going to make more than a few pairs of speakers with the ND20 tweeter I guess I'd get one? (if the fit would be snug but not too tight to fit)

Zaph · 23rd April 2008, 07:27 PM

Congrats, that's the first 36mm I'm seen. That should be perfect. But, I'd have to be mounting about 100 of these to make that bit worthwhile. (Anyone building a line array with these tweeters, take note) But for the average guy, a cheaper 1-7/16 is better. I've got a 1-3/8" that works but is a little sanding intensive.

Cataclysm · 23rd April 2008, 09:35 PM

If you knew someone with a lathe, it's literally a 2 minute job to just turn the major diameter of an oversized, imperial forstner bit down to spec. A viable, cheaper, and faster route of going.

Heck, depending on the type of forstner you have, you can run a file along it while it rotates at a low speed in your drill press; effectively turning it down to whatever diameter you desire. Just clean up the teeth and chip removers with some small needle files when you're done!

critofur · 13th March 2011, 08:29 PM

File huh? Diamond file?

Found a much cheaper source, I THINK this is a 36mm bit - I'm not certain if the 36mm is the width of the hole, but I think so?:

Southeast Tool SEHB5736RH - Hinge Drill Bit, 36mm Dia., 10mm Shank

Price seems good, anyway.

23rd April 2008, 07:27 PM	#2
Zaph diyAudio Member Join Date: Sep 2003 Location: Wisconsin	Congrats, that's the first 36mm I'm seen. That should be perfect. But, I'd have to be mounting about 100 of these to make that bit worthwhile. (Anyone building a line array with these tweeters, take note) But for the average guy, a cheaper 1-7/16 is better. I've got a 1-3/8" that works but is a little sanding intensive. __________________ -Zaph\|Audio-

13th March 2011, 08:29 PM	#4
critofur diyAudio Member Join Date: Jan 2004 Location: Columbus, OH	Cheaper [but still carbide tip] 36mm Forstner bit File huh? Diamond file? Found a much cheaper source, I THINK this is a 36mm bit - I'm not certain if the 36mm is the width of the hole, but I think so?: Southeast Tool SEHB5736RH - Hinge Drill Bit, 36mm Dia., 10mm Shank Price seems good, anyway. __________________ Critofur http://www.ohmspeakers.com <- all the folks here are my friends

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23rd April 2008, 09:35 PM	#3
Cataclysm diyAudio Member Join Date: Sep 2007	If you knew someone with a lathe, it's literally a 2 minute job to just turn the major diameter of an oversized, imperial forstner bit down to spec. A viable, cheaper, and faster route of going. Heck, depending on the type of forstner you have, you can run a file along it while it rotates at a low speed in your drill press; effectively turning it down to whatever diameter you desire. Just clean up the teeth and chip removers with some small needle files when you're done!

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