I own two 2465 oscilloscopes. Both had broken collets. I machined new collets from nylon bar stock to replace them. These have 4-40 thread and use the existing inserts from the old collets. I made 10 more collets, was going to put on Ebay but it is not worth the trouble. Photos are in folder named "2465 Fan Collet Replacement". If anyone needs one of these, you can send me an Email. I want to sell these collets; they are precision parts. I was a Journeyman Tool & Die Maker for 26 years.
David

David

Those are the most beautiful replacement collets I've seen.
You've done a fine job.

Personally, I don't need any, but those owners of earlier 2445/65's would do well to buy one of those and keep as a spare.

Menahem
CondorAudio

I am retired now, but always enjoyed running the lathe. I had to Re-Cap two 2465's that I own, and both had broken collets. Either from a previous owner or just old and brittle. Because of the setup time and tooling involved I decided to make extra. These nylon parts should last a lifetime. If you don't over tighten and strip the threads.
David

I posted these collets on Ebay because I have no other way to receive payment and guarantee that you guys will receive them. There is one hour of labor in a collet, and setup time, special tooling to hold collet while drilling and slotting them, no profit. Just want to help others.
David

Hi,
David, the collet looks very nice. Well done.

I managed to find a 2465 at a flee marked this spring. By the way, I'm in
Norway, and here test equipment does not come up for sale very often, and
almost never at flee markets.
It had some issues, one of them was a broken collet that was attempted
glued back together.
I just made a model and 3d printed. Used the original threaded insert. I
have uploaded the model to thingiverse:
https://www.thingiverse.com/thing:6038348/files
As 3d printing dos not give a perfect surface, a bit of work might be
necessary, and insertion of the threaded insert is a bit difficult to get
perfectly aligned. I also made a 'inverse' model, to put on the collet when
inserting the insert, to prevent the thin wall from expanding.


Regards,
Askild


On Wed, Aug 2, 2023 at 8:37 PM david via groups.io <davide_us=
yahoo.com@groups.io> wrote:

I own two 2465 oscilloscopes. Both had broken collets. I machined new
collets from nylon bar stock to replace them. These have 4-40 thread and
use the existing inserts from the old collets. I made 10 more collets, was
going to put on Ebay but it is not worth the trouble. Photos are in folder
named "2465 Fan Collet Replacement". If anyone needs one of these, you can
send me an Email. I want to sell these collets; they are precision parts. I
was a Journeyman Tool & Die Maker for 26 years.
David

On 8/4/23 05:33, Askild wrote:

I also made a 'inverse' model, to put on the collet when
inserting the insert, to prevent the thin wall from expanding.

Hi,

Will you tell us more about that? I don't quite get it yet...especially "prevent the thin wall from expanding".

I think I understand, after viewing the pictures posted at thingiverse. Worried that the delicate plastic collet would melt and deform around the hot metal hub, the OP also made a sleeve. You insert the collet in the sleeve, then press in the hub. Once the hub is cool and the risk of meltdown is past, you discard the sleeve.

HTH,
Dave Wise
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of John Griessen <john@...>
Sent: Saturday, August 5, 2023 12:48 PM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: Re: [TekScopes] 2465 Fan Collet

On 8/4/23 05:33, Askild wrote:

I also made a 'inverse' model, to put on the collet when
inserting the insert, to prevent the thin wall from expanding.

Hi,

Will you tell us more about that? I don't quite get it yet...especially "prevent the thin wall from expanding".

I really like your collets and nylon was a good choice. I made some for fixing my 2465 following the drawings in the files section (Fan Collet - Tek 2465 O-scope.pdf). I've added a couple of pictures in the album "More 2465 fan collet photos". I made it from aluminum as specified - but it was scrap bar of unknown grade and the thread was single point cut on the lathe all as a single piece. A couple of interesting jigs were needed for both slitting and holding while cutting the thread, latter being a ground tube bored out to receive the collet while a bolt with a small nib to fit in the collet jaws (where the motor shaft goes) pushed it into place. The end protruded and was held in a 5C collet in the lathe while the end was screwcut.

Finish from slitting wasn't as good as I'd have liked, should have been more careful about the grade of bar!

Drawing was perfect - it worked first time (I used the metric version as I have that weird hybrid a metric Hardinge HLV-H).

Hi,

Yes Dave is correct. When inserting the threaded insert by heating it with
a soldering iron, set to low temperature, the collet can expand and no
longer fit the fan.
Using the sleeve while inserting prevents the expansion.

Regards,
Askild

I considered making them from aluminum but decided that putting an aluminum collet inside of a plastic impeller was not a good idea. It would be too easy to over tighten the nut and split the impeller. Also, the aluminum is heavier than nylon, didn't want extra weight on these 40+ year old fans. The nylon is from Grainger, good quality material, grain runs the length of collet. Should last a lifetime. Lot of expense in making them though. Fixtures, Tooling, Setup Time, Machining, for example, a small center drill is $12.00, A 4-40 tap is $15.00. So, I am making 20 more collets while I have the setup, and it is fresh in my mind. The latter is more important at 66 years old. :-)
David

Hi,
I am restoring some 2465x scopes and I know first hand the problem with the
fan collets. I can use 2 and will pay a fair price. I live in NYC and am
not in a hurry to ship them. Please reply with a price and a payment method
(PayPay) you prefer.

--

On Wed, Aug 2, 2023 at 2:37 PM david via groups.io <davide_us=
yahoo.com@groups.io> wrote:

I own two 2465 oscilloscopes. Both had broken collets. I machined new
collets from nylon bar stock to replace them. These have 4-40 thread and
use the existing inserts from the old collets. I made 10 more collets, was
going to put on Ebay but it is not worth the trouble. Photos are in folder
named "2465 Fan Collet Replacement". If anyone needs one of these, you can
send me an Email. I want to sell these collets; they are precision parts. I
was a Journeyman Tool & Die Maker for 26 years.
David

--
--
Best Regards,

Bill B.
Solutions that make sense.

Fan collets arrived today. Dave, you do beautiful work!!!

Thank you.

Hi there,

Haven't posted on here for years.... now is the time ! ^^
I seem to recognize some names here... David Wise, Sir Griessen, that rings a bell for sure.

A couple weeks ago I got an opportunity to get a 2465 for cheap, so that's what I did...

I know very little about these scopes but am now learning as I go... the collet is broken and the brushless motor is kaput too. I thought I was cursed, then later realised it's business as usual for these scopes ?! :-O Oh dear...

I just bit the bullet last night and ordered an expensive used motor from Qservice.. hoping it will work fine. Don't have the skills to do the surgery necessary to refurbish these motors (saw a tutorial on the net)

Now need to sort out the collet. I have no lathe nor the skills to operate one.

So I would like to buy one from you David if I can afford it.

I couldn't find your ad on Ebay, could you provide the link please ?

Do you ship to Europe ? I am in Frogland.

Collet is small and light, shouldn't be too expensive to just send it in a regular mail envelope, which would also avoid all the customs troubles and fees.

Would it be possible for you to include a nut to go on the insert ? My scope came without it :-/
In Frogland stores only sell metric of course, so I can't just go down the street to get a nut... but I would assume on your side of the pond, you can.

Fitting the insert : that part scares me a little.... so how is one to proceed exactly, to get a good result ? Build a little jig to align the collet with the metal piece ? Then heat up the metal piece to XX temperature, and slide it into the nylon ? At what temperature does Nylon melt ? This way I could adjust my hot air station and heat up the insert to just that and no more.

It seems like a lot of work just to fix a fan, but not much choice it seems... and the scope is well worth it so I do'nt mind :-)
Also, it's the only problem this scope has, and got it for super cheap (25 Euros, locally at that), so I am willing to spend some time and money to fix the fan. One can't use the scope without a fan anyway.. don't want to fry those precious hybrids.

Sorry for the long post, been a while since I came here.
Hi to the very few that may still remember me ! Nobody probably ! LOL

OK I am gone now...

Your welcome Wayne, should work fine for you. It takes one hour to make a collet. Plus setup and fixtures. Can't rush it or material will smear. Made 20 more and tried to cut faster, ruined all of them. If you need to remove the impeller in the future, don't do what other posts tell you to do, to loosen nut and tap to release the collet. I tried that on two scopes and both collets were broken. But that could just be age, old and brittle. Like me. Just remove the nut, use a screwdriver that fits the threaded insert, turn insert counterclockwise while holding impeller to keep from turning, turn until the insert contacts the impeller. Then continue turning the insert counterclockwise and collet will release from impeller. The insert is threaded into the collet to allow the insert to be used as a jack screw to release the collet. That is what the 4-40 thread is for. Not a good idea to tap on that motor anyway.
David

On Sun, Aug 13, 2023 at 11:07 AM, david wrote:

Your welcome Wayne, should work fine for you. It takes one hour to make a
collet. Plus setup and fixtures. Can't rush it or material will smear. Made 20
more and tried to cut faster, ruined all of them. If you need to remove the
impeller in the future, don't do what other posts tell you to do, to loosen
nut and tap to release the collet. I tried that on two scopes and both collets
were broken. But that could just be age, old and brittle. Like me. Just remove
the nut, use a screwdriver that fits the threaded insert, turn insert
counterclockwise while holding impeller to keep from turning, turn until the
insert contacts the impeller. Then continue turning the insert
counterclockwise and collet will release from impeller. The insert is threaded
into the collet to allow the insert to be used as a jack screw to release the
collet. That is what the 4-40 thread is for. Not a good idea to tap on that
motor anyway.
David

Great info! Thank you, David.

From what I've been told, the collets are usually already broken and tapping it isn't what breaks it. They're under constant tension and the plastic breaks over time. I twisted the screw the first time on mine and I thought I'd broken it but was told that it was likely already broken.

Barry - N4BUQ

When I removed the collet on my 2465 yesterday, it also fell to pieces.

I also tapped on the threaded section which the previous owner had already damaged, as it was snapped off the main body of the collet. I am waiting for a 3d printed replacement but still unsure about appropriate choice of 3d material.

Unable to attach pics.

Hi Roy,

As there is no exposure to UV, and temperature probably are below 60degC,
PLA should work just fine.
Any material will probably be fine, as long as the layer adhesion is good.
I printed with 0.1mm layer height.

Regards,
Askild

Hi Askild,

Thanks for the reply. I didn’t realise I had received a reply until midnight Aug31.

I have a mate working on printing one for me. I will let him know your height suggestion as I am not up to speed on 3d printing terminology.

Hi David,

Do you have any coolers for sale. I would be interested in two.

How much would shipping to,Cockburn, WA 6164, Australia cost?