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Fan collet for the 2465
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EricJ
Just to clarify, not my drawing. It was submitted to the group years back by another member of the group, don't remember who. --EricSent from my Galaxy
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-------- Original message --------From: gkricorissian <gregg-k@...> Date: 9/15/22 8:59 AM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Fan collet for the 2465 Drawing came through fine Eric, and it is good to consolidate the information in one place. I had a look at it, and it agrees pretty much with what I did. Main differences are: - you eliminated the treaded, double-ended adapter and included that feature into your part. My adapter was OK as found, and so I did not change the Tek design. This also made the collet easier to fabricate. - though the overall length shown on your drawing looks to be longer than my numbers; it is the same, taking the adapter's flange into account - the angle of the taper is shown as 4 degrees, while I calculated 4.4 degrees from the measurements I took. No big deal. - your adapter has 6 slots, which slightly reduces the surface area of the collet ... no big deal - your slots are longer, which may undermine the collet's concentricityLet's hope that the info we've posted is of help to TekFolk out there!
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gkricorissian
Drawing came through fine Eric, and it is good to consolidate the information in one place. I had a look at it, and it agrees pretty much with what I did.
Main differences are: - you eliminated the treaded, double-ended adapter and included that feature into your part. My adapter was OK as found, and so I did not change the Tek design. This also made the collet easier to fabricate. - though the overall length shown on your drawing looks to be longer than my numbers; it is the same, taking the adapter's flange into account - the angle of the taper is shown as 4 degrees, while I calculated 4.4 degrees from the measurements I took. No big deal. - your adapter has 6 slots, which slightly reduces the surface area of the collet ... no big deal - your slots are longer, which may undermine the collet's concentricity Let's hope that the info we've posted is of help to TekFolk out there! |
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EricJ
Hmm, let's try that again. It would seem that my email client butchered the link a bit.
https://groups.io/g/TekScopes/filessearch?p=name%2C%2C%2C20%2C1%2C0%2C0&q=Collet |
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EricJ
Hmm. I will see if I can find it. If not, I will re-upload it. --EricSent from my Galaxy
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-------- Original message --------From: gkricorissian <gregg-k@...> Date: 9/14/22 8:49 AM (GMT-06:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Fan collet for the 2465 Eric, thanks for following up. I spent a bunch of time perusing the files section for the drawing you mention before giving up, and getting on with machining my own fan collet. I hope the pic I posted this morning helps others who are stuck with this same problem.
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gkricorissian
Eric, thanks for following up.
I spent a bunch of time perusing the files section for the drawing you mention before giving up, and getting on with machining my own fan collet. I hope the pic I posted this morning helps others who are stuck with this same problem. |
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EricJ
There is already a full blueprint available for this in the uploads section as I recall. I downloaded one from there done time ago with the intention of making a few to help some fellows out who might have needed one at the time, but I think they got it done themselves. --EricSent from my Galaxy
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-------- Original message --------From: n4buq <n4buq@...> Date: 9/13/22 9:33 AM (GMT-06:00) To: tekscopes <TekScopes@groups.io> Subject: Re: [TekScopes] Fan collet for the 2465 Hi Gregg,You can upload pictures to the groups.io site for this group.I managed to repair my broken collet but a new one would be nice. I wish I had a lathe and a milling machine...Welcome to the group!Thanks,Barry - N4BUQ----- Original Message -----> From: "gkricorissian" <gregg-k@...>> To: "tekscopes" <TekScopes@groups.io>> Sent: Tuesday, September 13, 2022 9:15:34 AM> Subject: [TekScopes] Fan collet for the 2465> I mentioned in my intro that I had made a new collet to replace the one> which secures the fan impeller on my 2465, which is the same as those found> on many Tek scopes. I tried sending a picture of the broken/black plastic> collet and the replacement I machined from 6061-T6 alloy bar, but the> Tekscopes site bounced it because attachments are not allowed.> > > > So, in a "second-best" effort, here are some notes about machining a new> collet from round bar stock:> > 1. The double-ended metal adapter simply unscrews from the old plastic> collet, and can be re-used on your new collet> > 2. The tapped hole in the new collet for that adapter is threaded 4-40> > 3. The male thread at the other end of the adapter is 8-32, in case you> need a new nut for it.> > 4. The new collet could be machined from alloy or brass bar depending on> what you have available.> > > > Dimensions of the new collet are simple:> > - over-all length: 0.730"> > - diameter of the cone (the large end): 0.344"> > - diameter of parallel shank (the small end): 0.291"> > - axial length of taper, from the large end of the cone to the start of the> parallel shank: 0.344"> > - angle of taper: 4.4 degrees> > - hole for motor shaft: 2mm> > - collet slots are not critical, but should be narrow as practical. I used> a 1/32" slitting saw on mine.> > > > Feel free to ask for any clarifications you may need.> > .. Gregg> > > > > >
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n4buq
Hi Gregg,
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You can upload pictures to the groups.io site for this group. I managed to repair my broken collet but a new one would be nice. I wish I had a lathe and a milling machine... Welcome to the group! Thanks, Barry - N4BUQ ----- Original Message -----
From: "gkricorissian" <gregg-k@...> I mentioned in my intro that I had made a new collet to replace the one |
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gkricorissian
I mentioned in my intro that I had made a new collet to replace the one
which secures the fan impeller on my 2465, which is the same as those found on many Tek scopes. I tried sending a picture of the broken/black plastic collet and the replacement I machined from 6061-T6 alloy bar, but the Tekscopes site bounced it because attachments are not allowed. So, in a "second-best" effort, here are some notes about machining a new collet from round bar stock: 1. The double-ended metal adapter simply unscrews from the old plastic collet, and can be re-used on your new collet 2. The tapped hole in the new collet for that adapter is threaded 4-40 3. The male thread at the other end of the adapter is 8-32, in case you need a new nut for it. 4. The new collet could be machined from alloy or brass bar depending on what you have available. Dimensions of the new collet are simple: - over-all length: 0.730" - diameter of the cone (the large end): 0.344" - diameter of parallel shank (the small end): 0.291" - axial length of taper, from the large end of the cone to the start of the parallel shank: 0.344" - angle of taper: 4.4 degrees - hole for motor shaft: 2mm - collet slots are not critical, but should be narrow as practical. I used a 1/32" slitting saw on mine. Feel free to ask for any clarifications you may need. .. Gregg |
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