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Old 10th October 2019, 09:08 AM   #3401
MEPER is offline MEPER  Denmark
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Steve Luck:
Which kind to router bit do you use for cutting into aluminium?
Do you run "full speed" like cutting into wood?
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Old 10th October 2019, 09:36 AM   #3402
Steve Luck is offline Steve Luck  New Zealand
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I think it was a double fluted 6mm Tungsten Carbide. Nothing special just one that looked sturdy enough not to snap off and small enough not to lose speed and bog down. It took a couple of dozen passes and I stopped a few times to clear out the swarf and spray some more oil on it. You tube videos suggest you slow the speed down but I found it worked better with a bit of speed. Too fast and you'd heat everything up. As with circle cutting wood using a router the biggest trick is to ensure the centre of the circle stays put when you break through because it's whats holding the router in position. You'll see in the photo a screw offset from the centre of the circle holding it in place. The result isn't CNC perfect but it's cleaned up with bit of sandpaper in the drill press. I have a bit of dowel with a slot cut into it that I can put strips of sandpaper into to polish things up with. I thought the brushed finish would suffer and kept a sharp eye out for any swarf between the router base and the front. There's a couple of micro scratches that might benefit from being gone over with a scouring pad but not something instantly obvious.
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Old 10th October 2019, 11:08 AM   #3403
avtech23 is offline avtech23  Australia
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B1 with Korg Triode
Quote:
Originally Posted by batty View Post
avtech, if you are close, you'll have to come over sometime, I have a few DIY bits in my system. Building speakers next, a Lenehan LK1 kit.
Thanks Batty, drop me a PM which suburb you're in.

Quote:
Originally Posted by Steve Luck View Post
I think it was a double fluted 6mm Tungsten Carbide.
How did the Forstener bit fair in ally?
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Last edited by avtech23; 10th October 2019 at 11:11 AM.
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Old 10th October 2019, 12:38 PM   #3404
Steve Luck is offline Steve Luck  New Zealand
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I was very surprised by the forstner bit it made slow but steady progress and did a neat job creating countersinks for the knobs. I put the drill on the lowest speed for that to get some torque as the drill is pretty gutless and the motor stalls given a chance. Guy on Youtube compared using a forstner bit to using a spade drill. The spade drill went through very easily creating big ribbons but left a threaded edge. Forstner bit is smooth cut with a small bur on the top edge.
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Old 10th October 2019, 02:46 PM   #3405
emacs is offline emacs
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I missed last year Christmas present abut the B1 with Korg Triode Pcb.
May i know where can i get this PCB Gerber file as i can make PCB by myself. Thank you.
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Old 10th October 2019, 02:59 PM   #3406
emacs is offline emacs
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Quote:
Originally Posted by Soundhappy View Post
Four pins socket's so why 3 thru holes are drilled not 4 on the left and right PCB side?
Again one more time: is better to build good working prototype(s) first so no need to apologize
to the hobby amateurs after the bad surprises....
Click the image to open in full size.

Dear Soundhappy,

May i know why you do this (red circle) in your PCB. I see some people will do this on their PCB.

It is Grounding or about the noise?

Does anyone can tell me how to design audio PCB will better?
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Old 10th October 2019, 03:34 PM   #3407
Zen Mod is online now Zen Mod  Serbia
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B1 with Korg Triode
it isn't Soundhappy's pcb
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Old 10th October 2019, 03:41 PM   #3408
meanman1964 is offline meanman1964  Belgium
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Quote:
Originally Posted by emacs View Post
Click the image to open in full size.

Dear Soundhappy,

May i know why you do this (red circle) in your PCB. I see some people will do this on their PCB.

It is Grounding or about the noise?

Does anyone can tell me how to design audio PCB will better?
The many holes is to prevent capacitance between the top and copper layer , I think .
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Old 10th October 2019, 04:01 PM   #3409
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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B1 with Korg Triode
I am so happy for sound.
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Old 10th October 2019, 11:00 PM   #3410
Hikari1 is online now Hikari1  United States
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A spent some time playing around with the trimpots...

Started at 9.5V: sound is very 3D and "wet" compared to solid state. I do sense a bit of veiling or fuzziness however.

At 10.5V: Much tighter and more dynamic. Bass is cleaner. But it has somehow turned from 3D to 2D. Not fun anymore. If I want this sound I will use my solid state preamps which are better at this type of presentation.

I turned it down to 9.75V and left it there.

But this may all be dependent on your speaker efficiency, amplifier gain and listening volume.

I think I may need 2 preamps in my life...the B1 Korg and a clean solid state pre.
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