[GreenKeys] Model 33 printer heads

Fri Mar 27 18:13:34 EDT 2020

And when I say a process like that was used by teletype, I mean using a
band around a cylinder, I have no idea how they made the band itself.

I am actually curious what the black epoxy like material used in the type
cylinder is. For the era I assumed bakelite, but I did not think bakelite
could take that kind of beating, even from inside a steel band. I assume it
is just a thin layer above a steel core but without dissasembling a
cylinder I have no idea.

-Eric

On Fri, Mar 27, 2020, 17:06 Eric Moore <mooreericnyc at gmail.com> wrote:

> I would propose checking with a machinist for a quote. There are cnc
> configurations that are used to do rotational engraving that may be perfect
> for this. 4 axis vs 5 axis machining are also very different in price up
> front and per unit.
>
> As far as casting goes, finding someone to quote an exact casting in jb
> weld or a similar material will be exceedingly challenging. Most other
> materials can not handle the force of the repeated hammer strikes.
>
> The other option is to use the flat shape on thingiverse and machine it
> with a standard 3 axis cnc machine, then create a cylinder by welding the
> ends together around a machined cylinder of solid steel. You would likely
> need to heat the band and cool the cylinder to get a precise fit, but a
> process like that was likely what teletype did based on my observations.
>
> -Eric
>
>
>
>
> On Fri, Mar 27, 2020, 16:43 <tomas at tlec.se> wrote:
>
>> 4 or 5 axis does not matter, the problem is the resolution, as I see it,
>> it is probably cheaper to print them, next is casting and third is
>> machining.
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
>> *Från:* Eric Moore <mooreericnyc at gmail.com>
>> *Skickat:* den 27 mars 2020 22:35
>> *Till:* tomas at tlec.se
>> *Kopia:* Greenkeys <greenkeys at mailman.qth.net>
>> *Ämne:* Re: [GreenKeys] Model 33 printer heads
>>
>>
>>
>> Yes, and perhaps unnecessary as a 4 axis machine would likely do
>> the trick.
>>
>>
>>
>>
>>
>> On Fri, Mar 27, 2020, 16:29 <tomas at tlec.se> wrote:
>>
>> I will certainly come back with more information.
>>
>> Machining them with a 5-D router would probably be very expensive, if one
>> wants to meet the resolution on the existing heads, most likely radious of
>> less than 0,1 mm or so.
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
>> *Från:* Eric Moore <mooreericnyc at gmail.com>
>> *Skickat:* den 27 mars 2020 22:20
>> *Till:* tomas at tlec.se
>> *Kopia:* Greenkeys <greenkeys at mailman.qth.net>
>> *Ämne:* Re: [GreenKeys] Model 33 printer heads
>>
>>
>>
>> Awesome, a high resolution steel 3d printing process may be less
>> expensive then having them machined.
>>
>>
>>
>> I hope it turns out well, and if you have any details on the process he
>> is using and the resolution he can achieve I would be interested in the
>> details.
>>
>>
>>
>> -Eric
>>
>>
>>
>>
>>
>> On Fri, Mar 27, 2020, 16:00 <tomas at tlec.se> wrote:
>>
>> According to my contact, it should not be a problem printing these in
>> steel, however, solid steel might be to heavy for the printing mechanism,
>> so I will have to modify the model, in order to make it lighter, to at
>> least the same weight as the original head.
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
>> *Från:* Eric Moore <mooreericnyc at gmail.com>
>> *Skickat:* den 27 mars 2020 21:45
>> *Till:* tomas at tlec.se
>> *Kopia:* Greenkeys <greenkeys at mailman.qth.net>
>> *Ämne:* Re: [GreenKeys] Model 33 printer heads
>>
>>
>>
>> In steel a machining process would likely produce the best results
>> according to my friend.
>>
>>
>>
>> https://www.cnccookbook.com/4-axis-cnc-in-2020-the-definitive-guide/
>>
>>
>>
>> Though I have no idea what crazy 3d printing tech exists nowadays.
>>
>>
>>
>> There are companies that could be engaged for quotes. At minimum it
>> should be compared in terms of cost/resolution/strength. I could not find a
>> vendor with a high enough resolution in steel myself.
>>
>>
>>
>> -Eric
>>
>>
>>
>> On Fri, Mar 27, 2020, 15:31 <tomas at tlec.se> wrote:
>>
>> Yes it did, and thats why I reacted
>>
>> Quote
>>
>> A couple of wheels are available for museums or educators who need them.
>> Please contact me directly off list. These are direct casts from original
>> wheels and do not contain the signature present in the 3d models.
>>
>>
>>
>> No further details on the process will be provided, as it required a lot
>> of advanced technique and my friend is not interested in writing a long
>> detailed guide as would be required
>>
>> End quote
>>
>> My intention is to make them available to everyone at basicaly self cost
>> price, I do not intend to make any money on this. However, if I am going to
>> order more than that is sold, then I have to make profit.
>>
>>
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
>> *Från:* Paul Heller <paul0926 at comcast.net>
>> *Skickat:* den 27 mars 2020 21:17
>> *Till:* Eric Moore <mooreericnyc at gmail.com>
>> *Kopia:* tomas at tlec.se; Greenkeys <greenkeys at mailman.qth.net>
>> *Ämne:* Re: [GreenKeys] Model 33 printer heads
>>
>>
>>
>> Your first post did make it out to the group. I saw it
>>
>> Paul
>> W2TTY
>>
>> ITTY:
>> HTTP://INTERNET-TTY.NET:8000/ITTY <http://internet-tty.net:8000/ITTY>
>> ITTY100:            HTTP://INTERNET-TTY.NET:8010/ITTY100
>> <http://internet-tty.net:8040/EUROPE>
>>
>> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
>> <http://internet-tty.net:8030/AUTOSTART>
>> EUROPE:           HTTP://INTERNET-TTY.NET:8040/EUROPE
>> <http://internet-tty.net:8040/EUROPE>
>>
>>
>>
>> On Mar 27, 2020, at 2:15 PM, Eric Moore <mooreericnyc at gmail.com> wrote:
>>
>> 
>>
>> Hello, I tried to send the message below to the list a couple of days ago
>> but it didn't go through. Here it is again.
>>
>>
>>
>> Hello, I am writing to let you all know that my friend made a 3d model of
>> an asr 33 type wheel.
>>
>>
>>
>> https://www.thingiverse.com/thing:4159598
>>
>>
>>
>>  He used this to 3d print a high resolution model, and then created a
>> mold from that print, cast a new wheel in jb weld, and that wheel was
>> tested in an ASR 33 and it worked. The model is provided for anyone who
>> wants to attempt casting a new wheel in jbweld or to use any other
>> manufacturing process they think may work.
>>
>>
>>
>> A couple of wheels are available for museums or educators who need them.
>> Please contact me directly off list. These are direct casts from original
>> wheels and do not contain the signature present in the 3d models.
>>
>>
>>
>> No further details on the process will be provided, as it required a lot
>> of advanced technique and my friend is not interested in writing a long
>> detailed guide as would be required.
>>
>>
>>
>> This model also allows for people to create new wheels with custom fonts,
>> have fun!
>>
>>
>>
>>
>>
>> On Fri, Mar 27, 2020, 14:21 <tomas at tlec.se> wrote:
>>
>> Well, I got the idea from that post, however, as i understood it, they
>> used the 3D-print to make a cast,  subsequently casting in epoxy.
>>
>> And I am using the stl-file from Thingiverse.
>>
>>
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
>> *Från:* Jeffrey Golas <jeffg at junknet.net>
>> *Skickat:* den 27 mars 2020 19:39
>> *Till:* tomas at tlec.se
>> *Kopia:* greenkeys at mailman.qth.net
>> *Ämne:* Re: [GreenKeys] Model 33 printer heads
>>
>>
>>
>> There is someone working on exactly this, if you search Thingiverse they
>> have a test model there.
>>
>>
>>
>> Jeff
>>
>>
>>
>> On Mar 27, 2020, at 1:32 PM, tomas at tlec.se wrote:
>>
>> 
>>
>> Dear folks.
>>
>> I am looking into, having a printerhead to my Model 33 3D-printed i
>> steel, is there any interest to have some more printed out.
>>
>> The guy I am talking to says that it should be doable to 3D-print it,
>> obviously it means that one can have any type of Head, with any
>> characterset made in this way.
>>
>> Currently I have no Idea what the cost would be, but wil have an
>> indication of price in the near future.
>>
>>
>>
>> Mvh
>>
>> Tomas Larsson
>>
>> Sweden
>>
>>
>>
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>
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