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General Discussions => Machine Shop => Topic started by: Ricardus on June 12, 2020, 03:31:16 PM

Title: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 12, 2020, 03:31:16 PM
I saw these mentioned in another thread, and I need some of these. They adapt 4mm pot shafts to 1/4 inch (6.35mm).

http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html

Does anyone happen to know of another supplier for these? Hopefully in the states?

I actually ordered 50 of these from Banzai but their postal service was having issues sending to the US so the pkg got returned to them, and no one seems to know if and when they will be able to ship these to me.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: ruffrecords on June 12, 2020, 04:27:08 PM
I think they also do ones that allow 6mm shafts to be used with quarter inch knobs.

Cheers

Ian
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: john12ax7 on June 12, 2020, 04:55:26 PM
I'm interested as well of the options out there.  Having more suppliers of shaft adapters would be great for everyone.

Iirc small bear electronics might have some.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 12, 2020, 05:10:16 PM
Pretty sure I checked Small Bear. I actually just did an order for some transistors with them the last time they opened up their web site for two days. I'll check again.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 12, 2020, 05:12:24 PM
They have this, but pretty sure it wouldn't work:

http://smallbear-electronics.mybigcommerce.com/knob-shaft-adapter-1-4-to-1-8/

MAYBE they would work if you reamed the inside to 4 mm. Might be worth ordering a few to test. But man, that price from Banzai is hard to beat, and those are what I would have designed in my head if you described the product to me.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: squarewave on June 12, 2020, 06:54:43 PM
Thats TE Connectivity KR-104. I've used those with success. You want KR-304. Google "KR304 adapter". It's around.

https://www.mouser.com/datasheet/2/418/NG_CD_1825620_A1-679015.pdf
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: abbey road d enfer on June 12, 2020, 07:04:57 PM
https://fr.aliexpress.com/item/32857462555.html?spm=a2g0o.productlist.0.0.59694a44vpBLTF&algo_pvid=afb00b76-2899-49ce-a77c-592223bb6609&algo_expid=afb00b76-2899-49ce-a77c-592223bb6609-23&btsid=0ab50f6115920030399674625e743a&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 12, 2020, 08:46:16 PM
Thats TE Connectivity KR-104. I've used those with success. You want KR-304. Google "KR304 adapter". It's around.

https://www.mouser.com/datasheet/2/418/NG_CD_1825620_A1-679015.pdf

Not a TON of people who have them in stock. Online Components does, but they're a bit pricey. I will continue looking.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: rackmonkey on June 13, 2020, 12:08:10 AM
I have a guy that makes these in custom sizes for me for $5 for a couple if I  recall right. I had him make me some to build my own dual concentric switches for EQs.

Nice guy and makes them/ships them quick.

Let me know if you want his info.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 13, 2020, 05:40:21 PM
I have a guy that makes these in custom sizes for me for $5 for a couple if I  recall right. I had him make me some to build my own dual concentric switches for EQs.

Nice guy and makes them/ships them quick.

Let me know if you want his info.

That's a little pricey for my wallet right now. But I'll let you know if I want his info in the future.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 19, 2020, 09:43:30 PM
So the bad news is I wasn't able to get those KR304's to work, and still no word from Banzai if they will ever ship the other units.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: squarewave on June 19, 2020, 10:20:33 PM
So the bad news is I wasn't able to get those KR304's to work, and still no word from Banzai if they will ever ship the other units.
Just curious but what exactly went wrong with the KR304s?
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 20, 2020, 11:58:11 AM
Just curious but what exactly went wrong with the KR304s?

The problem is these are D Shafts, and I thought  I would be able to put a shim in that space and these would work, but I couldn't get it to work.

 I think the ones from Banzai will work because that adapter is nearly a full circle, and for reasons I see in my head that are too complicated to explain (words are hard) they should work better.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: squarewave on June 20, 2020, 12:51:18 PM
The adapter has a cut-away for the set screw to reach the flatted part of the shaft so you might need a longer set screw but there's not supposed to be a shim there.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 21, 2020, 12:07:22 AM
The adapter has a cut-away for the set screw to reach the flatted part of the shaft so you might need a longer set screw but there's not supposed to be a shim there.

Well there's going to have to be, because 3 out of the 4 pots are center dentented and nothing lines up with the pointer line on the knobs.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: squarewave on June 21, 2020, 12:54:47 AM
Well there's going to have to be, because 3 out of the 4 pots are center dentented and nothing lines up with the pointer line on the knobs.
I see. But it sounds like the problem is actually the orientation of the pot and not the adapter.

I had a similar problem with my Pultec HLF3C PCB. I had to actually change the circuit to use switch positions that spanned the end of the throw and install the stop in an unconventional position just to get the pointer centered vertically. Surprisingly the PCB actually turned out to be correct.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 21, 2020, 01:48:17 AM
I see. But it sounds like the problem is actually the orientation of the pot and not the adapter.

I had a similar problem with my Pultec HLF3C PCB. I had to actually change the circuit to use switch positions that spanned the end of the throw and install the stop in an unconventional position just to get the pointer centered vertically. Surprisingly the PCB actually turned out to be correct.

It's 500 series so I have absolutely no choice on pot orientation unless I do something extreme.

 I'm just going to need to find some other sort of work-around.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: john12ax7 on June 21, 2020, 02:08:42 AM
You can get pots where the flat is in different positions,  basically the four quadrants.  You can also get knobs like this as well.  So that can be a workaround. But not always easy to find in small quantities.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: fragletrollet on June 21, 2020, 08:52:56 PM
Reichelt.de has 4mm to 6mm adapters, maybe they work for you  :)
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 21, 2020, 09:23:37 PM
Reichelt.de has 4mm to 6mm adapters, maybe they work for you  :)

Do you have a link for that? I searched and couldn't find them.

 I actually ordered some from Banzai music but they claimed they were having problems shipping to the US, so that's on hold.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 21, 2020, 09:26:02 PM
You can get pots where the flat is in different positions,  basically the four quadrants.  You can also get knobs like this as well.  So that can be a workaround. But not always easy to find in small quantities.

There are the classic unobtanium pots that only AML sells, so I'm kinda stuck with what I got.

I have knobs that I would LIKE to use, and I'm hoping the Banzai adapters will allow me to bodge it.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: fragletrollet on June 22, 2020, 10:20:07 AM
Do you have a link for that? I searched and couldn't find them.

 I actually ordered some from Banzai music but they claimed they were having problems shipping to the US, so that's on hold.

https://www.reichelt.com/no/en/metal-reducer-from-4-mm-to-6-mm-kr-4-6m-p42128.html?&nbc=1


Capi also have some 1/8" to 1/4"

https://capi-gear.com/catalog/index.php?cPath=202_204
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 22, 2020, 11:42:53 AM
Thanks!
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: abbey road d enfer on June 22, 2020, 02:48:33 PM
Well there's going to have to be, because 3 out of the 4 pots are center dentented and nothing lines up with the pointer line on the knobs.
Rich, can you post a pictureof what the problem is exactly?
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on June 28, 2020, 04:09:22 PM
So Abbey had the idea of gluing those KR104 adapters (mentioned earlier in the thread) right to the pot shafts, and since I'm an idiot, I hadn't thought of that! I gotta go get some fresh CA glue tomorrow and give this a try. I think it will work.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on August 25, 2020, 11:32:01 AM
So I actually didn't want to glue anything and make it sorta permanent, so I've been waiting for Banzai to ship the adapters I ordered from them in May, and they finally shipped and have landed at the DHL hub here in the states, and are on the way. Hopefully these will work.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: abbey road d enfer on August 25, 2020, 09:39:01 PM
How did it go?
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on August 26, 2020, 01:13:45 PM
How did it go?

They haven't arrived yet. They're somewhere in New Jersey.

As soon as I get them I will give it a go.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on September 03, 2020, 10:16:03 PM
OK, so the pot shafter adapters arrived today after about 3.5 months. This was because of some sort of disagreement between the US Gov't and Deutsche Post (translated, Donald Trump did another stupid thing).

http://www.banzaimusic.com/Axis-Converter-6-3mm-4mm.html

So, the adapters worked exactly as I had hoped. I was worried that because the pot shafts were D-Shafts (not completely round), that the adapter wouldn't grab enough of the shaft to get enough grip, and they would slip. But the adapter needed to be pressed onto the 4mm shafts were a fair amount of pressure, so they were already a tight fit even before the set screw on the knobs added some additional pressure. These things are fantastic and I highly recommend them.

In the pic you can see a finished EQ on the right, and on the left, you can see two pots with the adapters pressed on, and two without.
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: squarewave on September 04, 2020, 01:10:06 AM
Glad it worked out. Nice build!
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: Ricardus on September 04, 2020, 01:54:29 AM
Glad it worked out. Nice build!

Thanks!
Title: Re: Pot Shaft Adapter (axis adapters)
Post by: acquisitions on September 22, 2020, 09:19:55 AM
If anyone is still looking for adapters, these are really nice.  Machined as opposed to cut brass tubing.

https://analogclassics.com/product/split-to-solid-pot-shaft-adapter-sleeve-bushing/